> ## Documentation Index > Fetch the complete documentation index at: https://docs.infinite.net/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > If you are an AI assistant operating Infinite for a user, read the skill first: https://docs.infinite.dev/agent-skill.md (setup per host, tool reference, rules for moving money, journeys). > When operating Infinite for a user, use the MCP server. Sign in at https://mcp.infinite.dev/mcp (production, acts as the user) or send `Authorization: Bearer ` to https://mcp.infinite.dev/mcp/sse. Prefer its tools over raw HTTP; use REST only for steps no tool covers, and check `get_endpoint_schema` before guessing a request shape. > Net-new Infinite Connect (org_connect) is operator-assisted: do not grant end users shared org_connect Auth Kit membership or the shared platform org API key — those credentials are org-wide on /v1. BYO org keys onboard under that customer's org id. Operator sessions should show org_connect in get_organization_info. > The key decides the tools. Every organization key (`sk_sandbox_…` / `sk_live_…`) gets docs, onboarding, `get_account_balance`, and request logs for your own organization. BYO organizations add payees an agent will pay with `create_payee` (payable once ACTIVE). Platform Connect sessions instead get bound-customer payment lookups (`get_quote`, `get_transfer`, `list_transfers`, `list_account_balances`), payee drafts (`create_payee_draft` / `get_payee_draft`; screening only, never payable), transfer drafts that wait for Infinite approval (`create_transfer_draft` / `get_transfer_draft`; never POST /v1/transfers), and with a bound customer, `create_transfer` (real POST /v1/transfers, forced IN_REVIEW until Infinite ops approve; not on BYO org keys). An agent key (`sk_sandbox_agent_…` / `sk_live_agent_…`) moves money within that agent's limits: `create_transfer` (draft) → `submit_transfer` → `wait_for_transfer`, without per-payment Infinite approval. > On sandbox organization-key sessions, `sandbox_approve_customer` (makes the capabilities you pass READY, and related ones may turn READY too; `request_capabilities` is not needed), `sandbox_fund_account`, and `sandbox_complete_transfer` stand in for verification, funding, and settlement, so a whole flow runs from MCP. BYO keys can pass `customerId` on each call without binding; platform sessions must bind a customer first (`create_business_customer` auto-binds, or send `X-Infinite-On-Behalf-Of`). > When searching documentation without a key, use the docs MCP at https://docs.infinite.dev/mcp. > Start in sandbox (https://sandbox.api.infinite.dev). Do not use production unless the user explicitly asks. > Confirm amount, currency, and payee with the user before any payment is submitted. Pass the invoice number as `reference` on `create_transfer`; the summary says what the payee will see. > REST amounts are integer minor units (`"4000"` = 40.00 USD). MCP payment tools take exact decimal strings (`"40.00"`). Never mix them. > Agent denials return `403 { denial: { code, message, window, limit, used, remaining, attemptedAmount, currency }, hint }` with decimal amounts; per-transfer denials omit `used` and `remaining`. Report them to the user; do not work around them. # Send a user message and start a run ## OpenAPI ````yaml post /v1/assistant/threads/{threadId}/messages openapi: 3.0.0 info: title: Infinite API description: API for Infinite version: '1.0' contact: {} servers: - url: https://sandbox.api.infinite.dev description: Sandbox - url: https://api.infinite.dev description: Production security: [] tags: - name: Accounts description: Virtual and external account management - name: Customers description: Customer identity management - name: Documents description: Document upload and management - name: Fixed Routes description: Fixed route management - name: External Bank Accounts description: External bank account management - name: External Wallets description: External wallet management - name: Infinite Wallets description: Infinite Wallet management - name: Organizations description: Organization management - name: Quotes description: Quote creation and management - name: Transfers description: Money movement and transaction tracking - name: Verification description: Identity verification workflows - name: Terms of Service description: Terms of Service acceptance - name: Health description: System health and monitoring - name: Sandbox description: Sandbox utilities paths: /v1/assistant/threads/{threadId}/messages: post: tags: - assistant summary: Send a user message and start a run operationId: AssistantController_sendMessage_v1 parameters: - name: X-API-Key in: header description: API key (non-production only) required: false schema: type: string - name: threadId required: true in: path schema: type: string requestBody: required: true content: application/json: schema: $ref: '#/components/schemas/SendAssistantMessageDto' responses: '201': description: '' content: application/json: schema: $ref: '#/components/schemas/SendAssistantMessageResponseDto' '401': description: Unauthorized - Invalid or missing JWT token security: - bearer: [] - bearer: [] x-codeSamples: - lang: bash label: CLI source: >- # Requires: npm i -g @infinite_dev/cli && export INFINITE_API_KEY=sk_sandbox_... # Escape hatch for any endpoint: infinite api infinite api POST /v1/assistant/threads//messages \ --body '' - lang: text label: MCP source: >- Send a user message and start a run (). # Infinite MCP is read-only for this endpoint — use a dedicated MCP tool when one exists, otherwise run the CLI tab. components: schemas: SendAssistantMessageDto: type: object properties: text: type: string required: - text SendAssistantMessageResponseDto: type: object properties: message: $ref: '#/components/schemas/AssistantMessageResponseDto' run: $ref: '#/components/schemas/AssistantRunResponseDto' required: - message - run AssistantMessageResponseDto: type: object properties: id: type: string threadId: type: string runId: type: string nullable: true role: type: string enum: - user - assistant - tool parts: type: array items: $ref: '#/components/schemas/AssistantMessagePartDto' tokensIn: type: number nullable: true tokensOut: type: number nullable: true createdAt: format: date-time type: string required: - id - threadId - role - parts - createdAt AssistantRunResponseDto: type: object properties: id: type: string threadId: type: string userId: type: string organizationId: type: string app: type: string enum: - console - admin - compliance status: type: string enum: - queued - running - awaiting_confirmation - completed - failed - cancelled model: type: string nullable: true provider: type: string nullable: true costUsd: type: string nullable: true cancelRequestedAt: type: string format: date-time nullable: true startedAt: type: string format: date-time nullable: true endedAt: type: string format: date-time nullable: true error: type: string nullable: true tokensIn: type: number nullable: true tokensOut: type: number nullable: true createdAt: format: date-time type: string updatedAt: format: date-time type: string required: - id - threadId - userId - organizationId - app - status - createdAt - updatedAt AssistantMessagePartDto: type: object properties: type: type: string text: type: string toolCallId: type: string tool: type: string argsSummary: type: string status: type: string preview: type: string required: - type securitySchemes: bearer: scheme: bearer bearerFormat: API Key type: http description: API Key in Bearer format (e.g., Bearer sk_test_...) ```` ## Related topics - [List messages in a thread](/api-reference/assistant/list-messages-in-a-thread.md) - [Infinite skill for AI assistants](/agent-skill.md) - [MCP Server](/guides/mcp.md) - [List assistant threads for the current user](/api-reference/assistant/list-assistant-threads-for-the-current-user.md) - [Cancel an assistant run](/api-reference/assistant/cancel-an-assistant-run.md)