diff --git a/.gitignore b/.gitignore
index ad60fd8c1..cc8873c68 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,7 @@ packages/files/dist
 packages/models/dist
 packages/services/dist
 packages/utils/dist
+packages/api/dist
 
 **/.pnp.*
 **/.yarn/*
diff --git a/.yarn/cache/@standardnotes-api-npm-1.1.19-6a6d650ec9-cca168245a.zip b/.yarn/cache/@standardnotes-api-npm-1.1.19-6a6d650ec9-cca168245a.zip
deleted file mode 100644
index dd20ae1a2..000000000
Binary files a/.yarn/cache/@standardnotes-api-npm-1.1.19-6a6d650ec9-cca168245a.zip and /dev/null differ
diff --git a/.yarn/cache/@standardnotes-security-npm-1.1.0-9d90b8c189-2098584cd3.zip b/.yarn/cache/@standardnotes-security-npm-1.1.0-9d90b8c189-2098584cd3.zip
new file mode 100644
index 000000000..535e70507
Binary files /dev/null and b/.yarn/cache/@standardnotes-security-npm-1.1.0-9d90b8c189-2098584cd3.zip differ
diff --git a/packages/api/.eslintignore b/packages/api/.eslintignore
new file mode 100644
index 000000000..f06235c46
--- /dev/null
+++ b/packages/api/.eslintignore
@@ -0,0 +1,2 @@
+node_modules
+dist
diff --git a/packages/api/.eslintrc b/packages/api/.eslintrc
new file mode 100644
index 000000000..cb7136174
--- /dev/null
+++ b/packages/api/.eslintrc
@@ -0,0 +1,6 @@
+{
+  "extends": "../../.eslintrc",
+  "parserOptions": {
+    "project": "./linter.tsconfig.json"
+  }
+}
diff --git a/packages/api/CHANGELOG.md b/packages/api/CHANGELOG.md
new file mode 100644
index 000000000..b23bc8e16
--- /dev/null
+++ b/packages/api/CHANGELOG.md
@@ -0,0 +1,118 @@
+# Change Log
+
+All notable changes to this project will be documented in this file.
+See [Conventional Commits](https://conventionalcommits.org) for commit guidelines.
+
+# [1.3.0](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.2.1...@standardnotes/api@1.3.0) (2022-07-06)
+
+### Features
+
+* remove filepicker, features, services and models packages in favor of standardnotes/app repository ([27f474e](https://github.com/standardnotes/snjs/commit/27f474e859701c5713c8b6ed27cd1a4d5e4392bb))
+
+## [1.2.1](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.2.0...@standardnotes/api@1.2.1) (2022-07-05)
+
+**Note:** Version bump only for package @standardnotes/api
+
+# [1.2.0](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.20...@standardnotes/api@1.2.0) (2022-07-05)
+
+### Features
+
+* remove encryption package in favor of standardnotes/app repository ([f6d1c9e](https://github.com/standardnotes/snjs/commit/f6d1c9ee538bb59ee7ac28c0d49ca682d4eb4d38))
+
+## [1.1.20](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.19...@standardnotes/api@1.1.20) (2022-07-04)
+
+### Bug Fixes
+
+* add missing reflect-metadata package to all packages ([ce3a5bb](https://github.com/standardnotes/snjs/commit/ce3a5bbf3f1d2276ac4abc3eec3c6a44c8c3ba9b))
+
+## [1.1.19](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.18...@standardnotes/api@1.1.19) (2022-06-29)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.18](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.17...@standardnotes/api@1.1.18) (2022-06-28)
+
+### Bug Fixes
+
+* setting custom host ([#773](https://github.com/standardnotes/snjs/issues/773)) ([2fe27b0](https://github.com/standardnotes/snjs/commit/2fe27b0324486fad915a91096142579e649995b8))
+
+## [1.1.17](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.16...@standardnotes/api@1.1.17) (2022-06-27)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.16](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.15...@standardnotes/api@1.1.16) (2022-06-27)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.15](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.14...@standardnotes/api@1.1.15) (2022-06-23)
+
+### Bug Fixes
+
+* set host on user server ([#771](https://github.com/standardnotes/snjs/issues/771)) ([62d2c60](https://github.com/standardnotes/snjs/commit/62d2c60834b20b386b8c60f0ee172aec3e57ec05))
+
+## [1.1.14](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.13...@standardnotes/api@1.1.14) (2022-06-22)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.13](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.12...@standardnotes/api@1.1.13) (2022-06-22)
+
+### Bug Fixes
+
+* missing dependency ([b748571](https://github.com/standardnotes/snjs/commit/b748571c3288ecec3a2c0aed333ceaaf718832cd))
+
+## [1.1.12](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.11...@standardnotes/api@1.1.12) (2022-06-20)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.11](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.10...@standardnotes/api@1.1.11) (2022-06-16)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.10](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.9...@standardnotes/api@1.1.10) (2022-06-16)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.9](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.8...@standardnotes/api@1.1.9) (2022-06-15)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.8](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.7...@standardnotes/api@1.1.8) (2022-06-10)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.7](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.6...@standardnotes/api@1.1.7) (2022-06-09)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.6](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.5...@standardnotes/api@1.1.6) (2022-06-09)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.5](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.4...@standardnotes/api@1.1.5) (2022-06-09)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.4](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.3...@standardnotes/api@1.1.4) (2022-06-06)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.3](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.2...@standardnotes/api@1.1.3) (2022-06-03)
+
+**Note:** Version bump only for package @standardnotes/api
+
+## [1.1.2](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.1...@standardnotes/api@1.1.2) (2022-06-03)
+
+### Bug Fixes
+
+* add option to define additional params to the user registration request if needed ([78f169f](https://github.com/standardnotes/snjs/commit/78f169f993cb0d1950e553fe251f6bc903dd6da8))
+
+## [1.1.1](https://github.com/standardnotes/snjs/compare/@standardnotes/api@1.1.0...@standardnotes/api@1.1.1) (2022-06-03)
+
+### Bug Fixes
+
+* make response headers optional for ease of defining on the server side ([#755](https://github.com/standardnotes/snjs/issues/755)) ([b5c2092](https://github.com/standardnotes/snjs/commit/b5c2092fc33dbd389fa67c122b3907956ca2eafa))
+
+# 1.1.0 (2022-06-03)
+
+### Features
+
+* api service refactor -extract registration ([#733](https://github.com/standardnotes/snjs/issues/733)) ([1d7fac8](https://github.com/standardnotes/snjs/commit/1d7fac8c9dbb0fdb78a88743965a33c6d6a7d7d3))
diff --git a/packages/api/jest.config.js b/packages/api/jest.config.js
new file mode 100644
index 000000000..aabae3703
--- /dev/null
+++ b/packages/api/jest.config.js
@@ -0,0 +1,19 @@
+// eslint-disable-next-line @typescript-eslint/no-var-requires
+const base = require('../../node_modules/@standardnotes/config/src/jest.json');
+
+module.exports = {
+  ...base,
+  globals: {
+    'ts-jest': {
+      tsconfig: 'tsconfig.json',
+    },
+  },
+  coverageThreshold: {
+    global: {
+      branches: 17,
+      functions: 43,
+      lines: 46,
+      statements: 46
+    }
+  }
+};
diff --git a/packages/api/linter.tsconfig.json b/packages/api/linter.tsconfig.json
new file mode 100644
index 000000000..c1a7d22c5
--- /dev/null
+++ b/packages/api/linter.tsconfig.json
@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "exclude": ["dist"]
+}
diff --git a/packages/api/package.json b/packages/api/package.json
new file mode 100644
index 000000000..a9328c5c1
--- /dev/null
+++ b/packages/api/package.json
@@ -0,0 +1,44 @@
+{
+  "name": "@standardnotes/api",
+  "version": "1.3.0",
+  "engines": {
+    "node": ">=16.0.0 <17.0.0"
+  },
+  "description": "Interfaces for dealing with SN server-side API",
+  "main": "dist/src/index.js",
+  "author": "Standard Notes",
+  "types": "dist/src/index.d.ts",
+  "files": [
+    "dist/src"
+  ],
+  "publishConfig": {
+    "access": "public"
+  },
+  "license": "AGPL-3.0-or-later",
+  "scripts": {
+    "clean": "rm -fr dist",
+    "prestart": "yarn clean",
+    "start": "tsc -p tsconfig.json --watch",
+    "prebuild": "yarn clean",
+    "build": "tsc -p tsconfig.json",
+    "lint": "eslint . --ext .ts",
+    "test:unit": "jest spec --coverage"
+  },
+  "devDependencies": {
+    "@types/jest": "^27.4.1",
+    "@types/lodash": "^4.14.182",
+    "@typescript-eslint/eslint-plugin": "^5.30.0",
+    "eslint-plugin-prettier": "^4.2.1",
+    "jest": "^27.5.1",
+    "ts-jest": "^27.1.3"
+  },
+  "dependencies": {
+    "@standardnotes/common": "^1.23.1",
+    "@standardnotes/encryption": "workspace:*",
+    "@standardnotes/models": "workspace:*",
+    "@standardnotes/responses": "^1.6.39",
+    "@standardnotes/security": "^1.1.0",
+    "@standardnotes/services": "workspace:*",
+    "reflect-metadata": "^0.1.13"
+  }
+}
diff --git a/packages/api/src/Domain/Api/ApiVersion.ts b/packages/api/src/Domain/Api/ApiVersion.ts
new file mode 100644
index 000000000..b69ba8f1a
--- /dev/null
+++ b/packages/api/src/Domain/Api/ApiVersion.ts
@@ -0,0 +1,3 @@
+export enum ApiVersion {
+  v0 = '20200115',
+}
diff --git a/packages/api/src/Domain/Api/index.ts b/packages/api/src/Domain/Api/index.ts
new file mode 100644
index 000000000..0a84a596b
--- /dev/null
+++ b/packages/api/src/Domain/Api/index.ts
@@ -0,0 +1 @@
+export * from './ApiVersion'
diff --git a/packages/api/src/Domain/Client/User/UserApiService.spec.ts b/packages/api/src/Domain/Client/User/UserApiService.spec.ts
new file mode 100644
index 000000000..f9737d7b6
--- /dev/null
+++ b/packages/api/src/Domain/Client/User/UserApiService.spec.ts
@@ -0,0 +1,77 @@
+import { ProtocolVersion } from '@standardnotes/common'
+import { RootKeyParamsInterface } from '@standardnotes/models'
+import { UserRegistrationResponse } from '../../Response/User/UserRegistrationResponse'
+import { UserServerInterface } from '../../Server'
+import { UserApiService } from './UserApiService'
+
+describe('UserApiService', () => {
+  let userServer: UserServerInterface
+  let keyParams: RootKeyParamsInterface
+
+  const createService = () => new UserApiService(userServer)
+
+  beforeEach(() => {
+    userServer = {} as jest.Mocked<UserServerInterface>
+    userServer.register = jest.fn().mockReturnValue({
+      data: { user: { email: 'test@test.te', uuid: '1-2-3' } },
+    } as jest.Mocked<UserRegistrationResponse>)
+
+    keyParams = {} as jest.Mocked<RootKeyParamsInterface>
+    keyParams.getPortableValue = jest.fn().mockReturnValue({
+      identifier: 'test@test.te',
+      version: ProtocolVersion.V004,
+    })
+  })
+
+  it('should register a user', async () => {
+    const response = await createService().register('test@test.te', 'testpasswd', keyParams, false)
+
+    expect(response).toEqual({
+      data: {
+        user: {
+          email: 'test@test.te',
+          uuid: '1-2-3',
+        },
+      },
+    })
+    expect(userServer.register).toHaveBeenCalledWith({
+      api: '20200115',
+      email: 'test@test.te',
+      ephemeral: false,
+      identifier: 'test@test.te',
+      password: 'testpasswd',
+      version: '004',
+    })
+  })
+
+  it('should not register a user if it is already registering', async () => {
+    const service = createService()
+    Object.defineProperty(service, 'registering', {
+      get: () => true,
+    })
+
+    let error = null
+    try {
+      await service.register('test@test.te', 'testpasswd', keyParams, false)
+    } catch (caughtError) {
+      error = caughtError
+    }
+
+    expect(error).not.toBeNull()
+  })
+
+  it('should not register a user if the server fails', async () => {
+    userServer.register = jest.fn().mockImplementation(() => {
+      throw new Error('Oops')
+    })
+
+    let error = null
+    try {
+      await createService().register('test@test.te', 'testpasswd', keyParams, false)
+    } catch (caughtError) {
+      error = caughtError
+    }
+
+    expect(error).not.toBeNull()
+  })
+})
diff --git a/packages/api/src/Domain/Client/User/UserApiService.ts b/packages/api/src/Domain/Client/User/UserApiService.ts
new file mode 100644
index 000000000..b4a261b1c
--- /dev/null
+++ b/packages/api/src/Domain/Client/User/UserApiService.ts
@@ -0,0 +1,45 @@
+import { RootKeyParamsInterface } from '@standardnotes/models'
+
+import { ErrorMessage } from '../../Error/ErrorMessage'
+import { ApiCallError } from '../../Error/ApiCallError'
+import { UserRegistrationResponse } from '../../Response/User/UserRegistrationResponse'
+import { UserServerInterface } from '../../Server/User/UserServerInterface'
+import { ApiVersion } from '../../Api/ApiVersion'
+import { ApiEndpointParam } from '../../Request/ApiEndpointParam'
+import { UserApiServiceInterface } from './UserApiServiceInterface'
+
+export class UserApiService implements UserApiServiceInterface {
+  private registering: boolean
+
+  constructor(private userServer: UserServerInterface) {
+    this.registering = false
+  }
+
+  async register(
+    email: string,
+    serverPassword: string,
+    keyParams: RootKeyParamsInterface,
+    ephemeral: boolean,
+  ): Promise<UserRegistrationResponse> {
+    if (this.registering) {
+      throw new ApiCallError(ErrorMessage.RegistrationInProgress)
+    }
+    this.registering = true
+
+    try {
+      const response = await this.userServer.register({
+        [ApiEndpointParam.ApiVersion]: ApiVersion.v0,
+        password: serverPassword,
+        email,
+        ephemeral,
+        ...keyParams.getPortableValue(),
+      })
+
+      this.registering = false
+
+      return response
+    } catch (error) {
+      throw new ApiCallError(ErrorMessage.GenericRegistrationFail)
+    }
+  }
+}
diff --git a/packages/api/src/Domain/Client/User/UserApiServiceInterface.ts b/packages/api/src/Domain/Client/User/UserApiServiceInterface.ts
new file mode 100644
index 000000000..35952b73b
--- /dev/null
+++ b/packages/api/src/Domain/Client/User/UserApiServiceInterface.ts
@@ -0,0 +1,11 @@
+import { RootKeyParamsInterface } from '@standardnotes/models'
+import { UserRegistrationResponse } from '../../Response/User/UserRegistrationResponse'
+
+export interface UserApiServiceInterface {
+  register(
+    email: string,
+    serverPassword: string,
+    keyParams: RootKeyParamsInterface,
+    ephemeral: boolean,
+  ): Promise<UserRegistrationResponse>
+}
diff --git a/packages/api/src/Domain/Client/index.ts b/packages/api/src/Domain/Client/index.ts
new file mode 100644
index 000000000..8b0797259
--- /dev/null
+++ b/packages/api/src/Domain/Client/index.ts
@@ -0,0 +1,2 @@
+export * from './User/UserApiService'
+export * from './User/UserApiServiceInterface'
diff --git a/packages/api/src/Domain/Error/ApiCallError.ts b/packages/api/src/Domain/Error/ApiCallError.ts
new file mode 100644
index 000000000..5726f5961
--- /dev/null
+++ b/packages/api/src/Domain/Error/ApiCallError.ts
@@ -0,0 +1,6 @@
+export class ApiCallError extends Error {
+  constructor(message: string) {
+    super(message)
+    Object.setPrototypeOf(this, ApiCallError.prototype)
+  }
+}
diff --git a/packages/api/src/Domain/Error/ErrorMessage.ts b/packages/api/src/Domain/Error/ErrorMessage.ts
new file mode 100644
index 000000000..292e98d2b
--- /dev/null
+++ b/packages/api/src/Domain/Error/ErrorMessage.ts
@@ -0,0 +1,7 @@
+export enum ErrorMessage {
+  RegistrationInProgress = 'An existing registration request is already in progress.',
+  GenericRegistrationFail = 'A server error occurred while trying to register. Please try again.',
+  RateLimited = 'Too many successive server requests. Please wait a few minutes and try again.',
+  InsufficientPasswordMessage = 'Your password must be at least %LENGTH% characters in length. For your security, please choose a longer password or, ideally, a passphrase, and try again.',
+  PasscodeRequired = 'Your passcode is required in order to register for an account.',
+}
diff --git a/packages/api/src/Domain/Error/index.ts b/packages/api/src/Domain/Error/index.ts
new file mode 100644
index 000000000..f7961bf34
--- /dev/null
+++ b/packages/api/src/Domain/Error/index.ts
@@ -0,0 +1,2 @@
+export * from './ApiCallError'
+export * from './ErrorMessage'
diff --git a/packages/api/src/Domain/Http/ErrorTag.ts b/packages/api/src/Domain/Http/ErrorTag.ts
new file mode 100644
index 000000000..1ddc90d31
--- /dev/null
+++ b/packages/api/src/Domain/Http/ErrorTag.ts
@@ -0,0 +1,11 @@
+export enum ErrorTag {
+  MfaInvalid = 'mfa-invalid',
+  MfaRequired = 'mfa-required',
+  RefreshTokenInvalid = 'invalid-refresh-token',
+  RefreshTokenExpired = 'expired-refresh-token',
+  AccessTokenExpired = 'expired-access-token',
+  ParametersInvalid = 'invalid-parameters',
+  RevokedSession = 'revoked-session',
+  AuthInvalid = 'invalid-auth',
+  ReadOnlyAccess = 'read-only-access',
+}
diff --git a/packages/api/src/Domain/Http/HttpErrorResponseBody.ts b/packages/api/src/Domain/Http/HttpErrorResponseBody.ts
new file mode 100644
index 000000000..788a8d46e
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpErrorResponseBody.ts
@@ -0,0 +1,8 @@
+import { ErrorTag } from './ErrorTag'
+
+export type HttpErrorResponseBody = {
+  error: {
+    message: string
+    tag?: ErrorTag
+  }
+}
diff --git a/packages/api/src/Domain/Http/HttpHeaders.ts b/packages/api/src/Domain/Http/HttpHeaders.ts
new file mode 100644
index 000000000..e93603ae0
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpHeaders.ts
@@ -0,0 +1 @@
+export type HttpHeaders = Map<string, string | null>
diff --git a/packages/api/src/Domain/Http/HttpRequest.ts b/packages/api/src/Domain/Http/HttpRequest.ts
new file mode 100644
index 000000000..1f191b69d
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpRequest.ts
@@ -0,0 +1,13 @@
+import { HttpRequestParams } from './HttpRequestParams'
+import { HttpVerb } from './HttpVerb'
+
+export type HttpRequest = {
+  url: string
+  params?: HttpRequestParams
+  rawBytes?: Uint8Array
+  verb: HttpVerb
+  authentication?: string
+  customHeaders?: Record<string, string>[]
+  responseType?: XMLHttpRequestResponseType
+  external?: boolean
+}
diff --git a/packages/api/src/Domain/Http/HttpRequestParams.ts b/packages/api/src/Domain/Http/HttpRequestParams.ts
new file mode 100644
index 000000000..f0b6807cf
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpRequestParams.ts
@@ -0,0 +1 @@
+export type HttpRequestParams = Record<string, unknown>
diff --git a/packages/api/src/Domain/Http/HttpResponse.ts b/packages/api/src/Domain/Http/HttpResponse.ts
new file mode 100644
index 000000000..4fa6a6a92
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpResponse.ts
@@ -0,0 +1,12 @@
+import { HttpStatusCode } from './HttpStatusCode'
+import { HttpResponseBody } from './HttpResponseBody'
+import { HttpErrorResponseBody } from './HttpErrorResponseBody'
+import { HttpResponseMeta } from './HttpResponseMeta'
+import { HttpHeaders } from './HttpHeaders'
+
+export interface HttpResponse {
+  status: HttpStatusCode
+  data?: HttpResponseBody | HttpErrorResponseBody
+  meta?: HttpResponseMeta
+  headers?: HttpHeaders
+}
diff --git a/packages/api/src/Domain/Http/HttpResponseBody.ts b/packages/api/src/Domain/Http/HttpResponseBody.ts
new file mode 100644
index 000000000..cc2dcc5de
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpResponseBody.ts
@@ -0,0 +1 @@
+export type HttpResponseBody = Record<string, unknown>
diff --git a/packages/api/src/Domain/Http/HttpResponseMeta.ts b/packages/api/src/Domain/Http/HttpResponseMeta.ts
new file mode 100644
index 000000000..baebf9db6
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpResponseMeta.ts
@@ -0,0 +1,12 @@
+import { Role } from '@standardnotes/security'
+import { Uuid } from '@standardnotes/common'
+
+export type HttpResponseMeta = {
+  auth: {
+    userUuid?: Uuid
+    roles?: Role[]
+  }
+  server: {
+    filesServerUrl?: string
+  }
+}
diff --git a/packages/api/src/Domain/Http/HttpService.spec.ts b/packages/api/src/Domain/Http/HttpService.spec.ts
new file mode 100644
index 000000000..c0d07669e
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpService.spec.ts
@@ -0,0 +1,27 @@
+import { Environment } from '@standardnotes/services'
+import { HttpResponseMeta } from './HttpResponseMeta'
+import { HttpService } from './HttpService'
+
+describe('HttpService', () => {
+  const environment = Environment.Web
+  const appVersion = '1.2.3'
+  const snjsVersion = '2.3.4'
+  const host = 'http://bar'
+  let updateMetaCallback: (meta: HttpResponseMeta) => void
+
+  const createService = () => new HttpService(environment, appVersion, snjsVersion, host, updateMetaCallback)
+
+  beforeEach(() => {
+    updateMetaCallback = jest.fn()
+  })
+
+  it('should set host', () => {
+    const service = createService()
+
+    expect(service['host']).toEqual('http://bar')
+
+    service.setHost('http://foo')
+
+    expect(service['host']).toEqual('http://foo')
+  })
+})
diff --git a/packages/api/src/Domain/Http/HttpService.ts b/packages/api/src/Domain/Http/HttpService.ts
new file mode 100644
index 000000000..f2dd9bd73
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpService.ts
@@ -0,0 +1,190 @@
+import { isString, joinPaths } from '@standardnotes/utils'
+import { Environment } from '@standardnotes/services'
+import { HttpRequestParams } from './HttpRequestParams'
+import { HttpVerb } from './HttpVerb'
+import { HttpRequest } from './HttpRequest'
+import { HttpResponse } from './HttpResponse'
+import { HttpServiceInterface } from './HttpServiceInterface'
+import { HttpStatusCode } from './HttpStatusCode'
+import { XMLHttpRequestState } from './XMLHttpRequestState'
+import { ErrorMessage } from '../Error/ErrorMessage'
+import { HttpResponseMeta } from './HttpResponseMeta'
+import { HttpErrorResponseBody } from './HttpErrorResponseBody'
+
+export class HttpService implements HttpServiceInterface {
+  constructor(
+    private environment: Environment,
+    private appVersion: string,
+    private snjsVersion: string,
+    private host: string,
+    private updateMetaCallback: (meta: HttpResponseMeta) => void,
+  ) {}
+
+  setHost(host: string): void {
+    this.host = host
+  }
+
+  async get(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse> {
+    return this.runHttp({ url: joinPaths(this.host, path), params, verb: HttpVerb.Get, authentication })
+  }
+
+  async post(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse> {
+    return this.runHttp({ url: joinPaths(this.host, path), params, verb: HttpVerb.Post, authentication })
+  }
+
+  async put(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse> {
+    return this.runHttp({ url: joinPaths(this.host, path), params, verb: HttpVerb.Put, authentication })
+  }
+
+  async patch(path: string, params: HttpRequestParams, authentication?: string): Promise<HttpResponse> {
+    return this.runHttp({ url: joinPaths(this.host, path), params, verb: HttpVerb.Patch, authentication })
+  }
+
+  async delete(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse> {
+    return this.runHttp({ url: joinPaths(this.host, path), params, verb: HttpVerb.Delete, authentication })
+  }
+
+  private async runHttp(httpRequest: HttpRequest): Promise<HttpResponse> {
+    const request = this.createXmlRequest(httpRequest)
+
+    const response = await this.runRequest(request, this.createRequestBody(httpRequest))
+
+    if (response.meta) {
+      this.updateMetaCallback(response.meta)
+    }
+
+    return response
+  }
+
+  private createRequestBody(httpRequest: HttpRequest): string | Uint8Array | undefined {
+    if (
+      httpRequest.params !== undefined &&
+      [HttpVerb.Post, HttpVerb.Put, HttpVerb.Patch, HttpVerb.Delete].includes(httpRequest.verb)
+    ) {
+      return JSON.stringify(httpRequest.params)
+    }
+
+    return httpRequest.rawBytes
+  }
+
+  private createXmlRequest(httpRequest: HttpRequest) {
+    const request = new XMLHttpRequest()
+    if (httpRequest.params && httpRequest.verb === HttpVerb.Get && Object.keys(httpRequest.params).length > 0) {
+      httpRequest.url = this.urlForUrlAndParams(httpRequest.url, httpRequest.params)
+    }
+    request.open(httpRequest.verb, httpRequest.url, true)
+    request.responseType = httpRequest.responseType ?? ''
+
+    if (!httpRequest.external) {
+      request.setRequestHeader('X-SNJS-Version', this.snjsVersion)
+
+      const appVersionHeaderValue = `${Environment[this.environment]}-${this.appVersion}`
+      request.setRequestHeader('X-Application-Version', appVersionHeaderValue)
+
+      if (httpRequest.authentication) {
+        request.setRequestHeader('Authorization', 'Bearer ' + httpRequest.authentication)
+      }
+    }
+
+    let contenTypeIsSet = false
+    if (httpRequest.customHeaders && httpRequest.customHeaders.length > 0) {
+      httpRequest.customHeaders.forEach(({ key, value }) => {
+        request.setRequestHeader(key, value)
+        if (key === 'Content-Type') {
+          contenTypeIsSet = true
+        }
+      })
+    }
+    if (!contenTypeIsSet && !httpRequest.external) {
+      request.setRequestHeader('Content-Type', 'application/json')
+    }
+
+    return request
+  }
+
+  private async runRequest(request: XMLHttpRequest, body?: string | Uint8Array): Promise<HttpResponse> {
+    return new Promise((resolve, reject) => {
+      request.onreadystatechange = () => {
+        this.stateChangeHandlerForRequest(request, resolve, reject)
+      }
+      request.send(body)
+    })
+  }
+
+  private stateChangeHandlerForRequest(
+    request: XMLHttpRequest,
+    resolve: (response: HttpResponse) => void,
+    reject: (response: HttpResponse) => void,
+  ) {
+    if (request.readyState !== XMLHttpRequestState.Completed) {
+      return
+    }
+    const httpStatus = request.status
+    const response: HttpResponse = {
+      status: httpStatus,
+      headers: new Map<string, string | null>(),
+    }
+
+    const responseHeaderLines = request
+      .getAllResponseHeaders()
+      ?.trim()
+      .split(/[\r\n]+/)
+    responseHeaderLines?.forEach((responseHeaderLine) => {
+      const parts = responseHeaderLine.split(': ')
+      const name = parts.shift() as string
+      const value = parts.join(': ')
+
+      ;(<Map<string, string | null>>response.headers).set(name, value)
+    })
+
+    try {
+      if (httpStatus !== HttpStatusCode.NoContent) {
+        let body
+
+        const contentTypeHeader = response.headers?.get('content-type') || response.headers?.get('Content-Type')
+
+        if (contentTypeHeader?.includes('application/json')) {
+          body = JSON.parse(request.responseText)
+        } else {
+          body = request.response
+        }
+        /**
+         * v0 APIs do not have a `data` top-level object. In such cases, mimic
+         * the newer response body style by putting all the top-level
+         * properties inside a `data` object.
+         */
+        if (!body.data) {
+          response.data = body
+        }
+        if (!isString(body)) {
+          Object.assign(response, body)
+        }
+      }
+    } catch (error) {
+      console.error(error)
+    }
+    if (httpStatus >= HttpStatusCode.Success && httpStatus < HttpStatusCode.MultipleChoices) {
+      resolve(response)
+    } else {
+      if (httpStatus === HttpStatusCode.Forbidden && response.data && response.data.error !== undefined) {
+        ;(response.data as HttpErrorResponseBody).error.message = ErrorMessage.RateLimited
+      }
+
+      reject(response)
+    }
+  }
+
+  private urlForUrlAndParams(url: string, params: HttpRequestParams) {
+    const keyValueString = Object.keys(params)
+      .map((key) => {
+        return key + '=' + encodeURIComponent(params[key] as string)
+      })
+      .join('&')
+
+    if (url.includes('?')) {
+      return url + '&' + keyValueString
+    } else {
+      return url + '?' + keyValueString
+    }
+  }
+}
diff --git a/packages/api/src/Domain/Http/HttpServiceInterface.ts b/packages/api/src/Domain/Http/HttpServiceInterface.ts
new file mode 100644
index 000000000..281aacd81
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpServiceInterface.ts
@@ -0,0 +1,11 @@
+import { HttpRequestParams } from './HttpRequestParams'
+import { HttpResponse } from './HttpResponse'
+
+export interface HttpServiceInterface {
+  setHost(host: string): void
+  get(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse>
+  post(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse>
+  put(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse>
+  patch(path: string, params: HttpRequestParams, authentication?: string): Promise<HttpResponse>
+  delete(path: string, params?: HttpRequestParams, authentication?: string): Promise<HttpResponse>
+}
diff --git a/packages/api/src/Domain/Http/HttpStatusCode.ts b/packages/api/src/Domain/Http/HttpStatusCode.ts
new file mode 100644
index 000000000..3a8e7c54f
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpStatusCode.ts
@@ -0,0 +1,9 @@
+export enum HttpStatusCode {
+  Success = 200,
+  NoContent = 204,
+  MultipleChoices = 300,
+  BadRequest = 400,
+  Unauthorized = 401,
+  Forbidden = 403,
+  ExpiredAccessToken = 498,
+}
diff --git a/packages/api/src/Domain/Http/HttpVerb.ts b/packages/api/src/Domain/Http/HttpVerb.ts
new file mode 100644
index 000000000..2593b47bd
--- /dev/null
+++ b/packages/api/src/Domain/Http/HttpVerb.ts
@@ -0,0 +1,7 @@
+export enum HttpVerb {
+  Get = 'GET',
+  Post = 'POST',
+  Put = 'PUT',
+  Patch = 'PATCH',
+  Delete = 'DELETE',
+}
diff --git a/packages/api/src/Domain/Http/XMLHttpRequestState.ts b/packages/api/src/Domain/Http/XMLHttpRequestState.ts
new file mode 100644
index 000000000..89aeefa5f
--- /dev/null
+++ b/packages/api/src/Domain/Http/XMLHttpRequestState.ts
@@ -0,0 +1,3 @@
+export enum XMLHttpRequestState {
+  Completed = 4,
+}
diff --git a/packages/api/src/Domain/Http/index.ts b/packages/api/src/Domain/Http/index.ts
new file mode 100644
index 000000000..9b4c93dda
--- /dev/null
+++ b/packages/api/src/Domain/Http/index.ts
@@ -0,0 +1,13 @@
+export * from './ErrorTag'
+export * from './HttpErrorResponseBody'
+export * from './HttpHeaders'
+export * from './HttpRequest'
+export * from './HttpRequestParams'
+export * from './HttpResponse'
+export * from './HttpResponseBody'
+export * from './HttpResponseMeta'
+export * from './HttpService'
+export * from './HttpServiceInterface'
+export * from './HttpStatusCode'
+export * from './HttpVerb'
+export * from './XMLHttpRequestState'
diff --git a/packages/api/src/Domain/Request/ApiEndpointParam.ts b/packages/api/src/Domain/Request/ApiEndpointParam.ts
new file mode 100644
index 000000000..007ded326
--- /dev/null
+++ b/packages/api/src/Domain/Request/ApiEndpointParam.ts
@@ -0,0 +1,7 @@
+export enum ApiEndpointParam {
+  LastSyncToken = 'sync_token',
+  PaginationToken = 'cursor_token',
+  SyncDlLimit = 'limit',
+  SyncPayloads = 'items',
+  ApiVersion = 'api',
+}
diff --git a/packages/api/src/Domain/Request/User/UserRegistrationRequestParams.ts b/packages/api/src/Domain/Request/User/UserRegistrationRequestParams.ts
new file mode 100644
index 000000000..eee43049e
--- /dev/null
+++ b/packages/api/src/Domain/Request/User/UserRegistrationRequestParams.ts
@@ -0,0 +1,11 @@
+import { AnyKeyParamsContent } from '@standardnotes/common'
+import { ApiEndpointParam } from '../ApiEndpointParam'
+import { ApiVersion } from '../../Api/ApiVersion'
+
+export type UserRegistrationRequestParams = AnyKeyParamsContent & {
+  [ApiEndpointParam.ApiVersion]: ApiVersion.v0
+  password: string
+  email: string
+  ephemeral: boolean
+  [additionalParam: string]: unknown
+}
diff --git a/packages/api/src/Domain/Request/index.ts b/packages/api/src/Domain/Request/index.ts
new file mode 100644
index 000000000..c3324f422
--- /dev/null
+++ b/packages/api/src/Domain/Request/index.ts
@@ -0,0 +1,2 @@
+export * from './ApiEndpointParam'
+export * from './User/UserRegistrationRequestParams'
diff --git a/packages/api/src/Domain/Response/User/UserRegistrationResponse.ts b/packages/api/src/Domain/Response/User/UserRegistrationResponse.ts
new file mode 100644
index 000000000..9f83b2960
--- /dev/null
+++ b/packages/api/src/Domain/Response/User/UserRegistrationResponse.ts
@@ -0,0 +1,7 @@
+import { HttpErrorResponseBody } from '../../Http/HttpErrorResponseBody'
+import { HttpResponse } from '../../Http/HttpResponse'
+import { UserRegistrationResponseBody } from './UserRegistrationResponseBody'
+
+export interface UserRegistrationResponse extends HttpResponse {
+  data: UserRegistrationResponseBody | HttpErrorResponseBody
+}
diff --git a/packages/api/src/Domain/Response/User/UserRegistrationResponseBody.ts b/packages/api/src/Domain/Response/User/UserRegistrationResponseBody.ts
new file mode 100644
index 000000000..57cbd340f
--- /dev/null
+++ b/packages/api/src/Domain/Response/User/UserRegistrationResponseBody.ts
@@ -0,0 +1,11 @@
+import { Uuid } from '@standardnotes/common'
+import { KeyParamsData, SessionBody } from '@standardnotes/responses'
+
+export type UserRegistrationResponseBody = {
+  session: SessionBody
+  key_params: KeyParamsData
+  user: {
+    uuid: Uuid
+    email: string
+  }
+}
diff --git a/packages/api/src/Domain/Response/index.ts b/packages/api/src/Domain/Response/index.ts
new file mode 100644
index 000000000..a2ed09315
--- /dev/null
+++ b/packages/api/src/Domain/Response/index.ts
@@ -0,0 +1,2 @@
+export * from './User/UserRegistrationResponse'
+export * from './User/UserRegistrationResponseBody'
diff --git a/packages/api/src/Domain/Server/User/Paths.ts b/packages/api/src/Domain/Server/User/Paths.ts
new file mode 100644
index 000000000..5b9a09fc5
--- /dev/null
+++ b/packages/api/src/Domain/Server/User/Paths.ts
@@ -0,0 +1,9 @@
+const UserPaths = {
+  register: '/v1/users',
+}
+
+export const Paths = {
+  v1: {
+    ...UserPaths,
+  },
+}
diff --git a/packages/api/src/Domain/Server/User/UserServer.spec.ts b/packages/api/src/Domain/Server/User/UserServer.spec.ts
new file mode 100644
index 000000000..43251cae7
--- /dev/null
+++ b/packages/api/src/Domain/Server/User/UserServer.spec.ts
@@ -0,0 +1,39 @@
+import { ProtocolVersion } from '@standardnotes/common'
+import { ApiVersion } from '../../Api'
+import { HttpServiceInterface } from '../../Http'
+import { UserRegistrationResponse } from '../../Response'
+import { UserServer } from './UserServer'
+
+describe('UserServer', () => {
+  let httpService: HttpServiceInterface
+
+  const createServer = () => new UserServer(httpService)
+
+  beforeEach(() => {
+    httpService = {} as jest.Mocked<HttpServiceInterface>
+    httpService.post = jest.fn().mockReturnValue({
+      data: { user: { email: 'test@test.te', uuid: '1-2-3' } },
+    } as jest.Mocked<UserRegistrationResponse>)
+  })
+
+  it('should register a user', async () => {
+    const response = await createServer().register({
+      password: 'test',
+      api: ApiVersion.v0,
+      email: 'test@test.te',
+      ephemeral: false,
+      version: ProtocolVersion.V004,
+      pw_nonce: 'test',
+      identifier: 'test@test.te',
+    })
+
+    expect(response).toEqual({
+      data: {
+        user: {
+          email: 'test@test.te',
+          uuid: '1-2-3',
+        },
+      },
+    })
+  })
+})
diff --git a/packages/api/src/Domain/Server/User/UserServer.ts b/packages/api/src/Domain/Server/User/UserServer.ts
new file mode 100644
index 000000000..ca8f796f7
--- /dev/null
+++ b/packages/api/src/Domain/Server/User/UserServer.ts
@@ -0,0 +1,15 @@
+import { HttpServiceInterface } from '../../Http/HttpServiceInterface'
+import { UserRegistrationRequestParams } from '../../Request/User/UserRegistrationRequestParams'
+import { UserRegistrationResponse } from '../../Response/User/UserRegistrationResponse'
+import { Paths } from './Paths'
+import { UserServerInterface } from './UserServerInterface'
+
+export class UserServer implements UserServerInterface {
+  constructor(private httpService: HttpServiceInterface) {}
+
+  async register(params: UserRegistrationRequestParams): Promise<UserRegistrationResponse> {
+    const response = await this.httpService.post(Paths.v1.register, params)
+
+    return response as UserRegistrationResponse
+  }
+}
diff --git a/packages/api/src/Domain/Server/User/UserServerInterface.ts b/packages/api/src/Domain/Server/User/UserServerInterface.ts
new file mode 100644
index 000000000..e531f38d9
--- /dev/null
+++ b/packages/api/src/Domain/Server/User/UserServerInterface.ts
@@ -0,0 +1,6 @@
+import { UserRegistrationRequestParams } from '../../Request/User/UserRegistrationRequestParams'
+import { UserRegistrationResponse } from '../../Response/User/UserRegistrationResponse'
+
+export interface UserServerInterface {
+  register(params: UserRegistrationRequestParams): Promise<UserRegistrationResponse>
+}
diff --git a/packages/api/src/Domain/Server/index.ts b/packages/api/src/Domain/Server/index.ts
new file mode 100644
index 000000000..a2af11233
--- /dev/null
+++ b/packages/api/src/Domain/Server/index.ts
@@ -0,0 +1,3 @@
+export * from './User/Paths'
+export * from './User/UserServer'
+export * from './User/UserServerInterface'
diff --git a/packages/api/src/Domain/index.ts b/packages/api/src/Domain/index.ts
new file mode 100644
index 000000000..9fb72a2d0
--- /dev/null
+++ b/packages/api/src/Domain/index.ts
@@ -0,0 +1,7 @@
+export * from './Api'
+export * from './Client'
+export * from './Error'
+export * from './Http'
+export * from './Request'
+export * from './Response'
+export * from './Server'
diff --git a/packages/api/src/index.ts b/packages/api/src/index.ts
new file mode 100644
index 000000000..920deacdb
--- /dev/null
+++ b/packages/api/src/index.ts
@@ -0,0 +1 @@
+export * from './Domain'
diff --git a/packages/api/tsconfig.json b/packages/api/tsconfig.json
new file mode 100644
index 000000000..f3dac14ef
--- /dev/null
+++ b/packages/api/tsconfig.json
@@ -0,0 +1,13 @@
+{
+  "extends": "../../node_modules/@standardnotes/config/src/tsconfig.json",
+  "compilerOptions": {
+    "skipLibCheck": true,
+    "rootDir": "./src",
+    "outDir": "./dist",
+  },
+  "include": [
+    "src/**/*"
+  ],
+  "references": [],
+  "exclude": ["**/*.spec.ts", "dist", "node_modules"]
+}
diff --git a/yarn.lock b/yarn.lock
index 730b82bb3..6b9b2d58b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6167,19 +6167,25 @@ __metadata:
   languageName: unknown
   linkType: soft
 
-"@standardnotes/api@npm:^1.1.19":
-  version: 1.1.19
-  resolution: "@standardnotes/api@npm:1.1.19"
+"@standardnotes/api@^1.1.19, @standardnotes/api@workspace:packages/api":
+  version: 0.0.0-use.local
+  resolution: "@standardnotes/api@workspace:packages/api"
   dependencies:
-    "@standardnotes/auth": ^3.19.4
     "@standardnotes/common": ^1.23.1
-    "@standardnotes/encryption": ^1.8.23
+    "@standardnotes/encryption": "workspace:*"
+    "@standardnotes/models": "workspace:*"
     "@standardnotes/responses": ^1.6.39
-    "@standardnotes/services": ^1.13.23
-    "@standardnotes/utils": ^1.6.12
-  checksum: cca168245a80d333ca6433799a7cbe4a233956cace92b9e9ec45b3f67e4e907ef4f08a9573008bdf2b11a09100dc0381cff820ee5bea384407c2107c494913ba
-  languageName: node
-  linkType: hard
+    "@standardnotes/security": ^1.1.0
+    "@standardnotes/services": "workspace:*"
+    "@types/jest": ^27.4.1
+    "@types/lodash": ^4.14.182
+    "@typescript-eslint/eslint-plugin": ^5.30.0
+    eslint-plugin-prettier: ^4.2.1
+    jest: ^27.5.1
+    reflect-metadata: ^0.1.13
+    ts-jest: ^27.1.3
+  languageName: unknown
+  linkType: soft
 
 "@standardnotes/app-monorepo@workspace:.":
   version: 0.0.0-use.local
@@ -7081,6 +7087,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@standardnotes/security@npm:^1.1.0":
+  version: 1.1.0
+  resolution: "@standardnotes/security@npm:1.1.0"
+  dependencies:
+    "@standardnotes/common": ^1.23.1
+    jsonwebtoken: ^8.5.1
+    reflect-metadata: ^0.1.13
+  checksum: 2098584cd3fae7b89c13aba6b110a7717dbcce7121162a29478b0c2e754e37d349d1e869f6d0040b709377ec83d0ab0eeef668e234dedba1652fb760ffdf57cc
+  languageName: node
+  linkType: hard
+
 "@standardnotes/services@^1.13.23, @standardnotes/services@workspace:*, @standardnotes/services@workspace:packages/services":
   version: 0.0.0-use.local
   resolution: "@standardnotes/services@workspace:packages/services"