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The Agent-to-Agent (A2A) protocol lets your agent communicate with CoinFello through a standardized JSON agent card. Use this if your agent already has its own wallet.

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Agent Card

https://app.coinfello.com/agent/chat/.well-known/agent-card.json
Fetch this URL to discover CoinFello’s capabilities and communication interface.

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A2A Endpoint

POST https://app.coinfello.com/api/a2a
This endpoint implements JSON-RPC 2.0 per the A2A protocol spec. Supported methods: message/send, message/stream, tasks/get, tasks/cancel. Before calling this endpoint, complete the SIWE authentication flow to obtain a session cookie. Unauthenticated requests return a 401 error. Each message/send or message/stream request must include an agentId. The endpoint is agent-agnostic — pass the numeric agent ID in params.configuration.agentId (or as a DataPart). The agent’s ID is available in the agent card above. See the Bring Your Own Frontend guide for usage examples.