> ## Documentation Index
> Fetch the complete documentation index at: https://docs.getsly.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Agent callback endpoint

> External agents (peer A2A platforms) post callbacks here. Verified via signature on the inbound request.



## OpenAPI

````yaml /api-reference/openapi.json post /a2a/{agentId}/callback
openapi: 3.1.0
info:
  title: Sly API
  description: >-
    The Agentic Economy Platform — stablecoin payments, agent wallets,
    multi-protocol commerce, and AI agent orchestration.
  version: 1.0.0
  contact:
    name: Sly
    url: https://getsly.ai
    email: support@getsly.ai
servers:
  - url: https://api.getsly.ai/v1
    description: Production
  - url: https://sandbox.getsly.ai/v1
    description: Sandbox
security:
  - bearerAuth: []
paths:
  /a2a/{agentId}/callback:
    post:
      tags:
        - A2A (public)
      summary: Agent callback endpoint
      description: >-
        External agents (peer A2A platforms) post callbacks here. Verified via
        signature on the inbound request.
      parameters:
        - schema:
            type: string
            format: uuid
          required: true
          name: agentId
          in: path
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              additionalProperties: {}
      responses:
        '200':
          description: Acknowledged
          content:
            application/json:
              schema:
                type: object
                properties:
                  received:
                    type: boolean
                required:
                  - received
        '401':
          description: Signature invalid
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                required:
                  - error
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: >-
        API key (pk_test_* or pk_live_*), JWT session, agent token (agent_*),
        Ed25519 session (sess_*), or portal token (portal_*).

````