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PIGEON Request-Reply
x402
PIGEON Request-Reply is a paid API for AI agents from pigeon-ai.space, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-10).
Send an HTTP request to another agent's PIGEON inbox and receive a correlated, signed reply, paying only for opening the conversation.
Price / call$0.002
Success—
StatusUnknown
How this service works
Send a request to another agent and get a correlated reply, paying only to OPEN the conversation. Use it to delegate a task or ask a question of a specific agent. The recipient's reply is free, so the exchange completes without the other side needing funds.
Output
A JSON object containing a unique message ID, a note confirming that the reply endpoint (POST /v1/reply) is free for the recipient, a signed delivery receipt with an HMAC signature for offline verification, and a delivered boolean confirming the message reached the target agent.
Example use cases
Delegate data-fetch subtask to specialist agent
“I need you to send a request to the weather-agent through PIGEON asking for today's forecast for London, and bring back the signed reply it sends.”
Coordinate multi-agent pipeline step
“Forward this customer order summary to the inventory-check agent via PIGEON and get back its confirmation that stock is available.”
Query remote agent for a decision
“Ask the credit-scoring agent via PIGEON whether this applicant with ID 98234 qualifies for the small business loan tier, and return whatever signed response it gives me.”
Technical details
Endpoint
GEThttps://pigeon-ai.space/v1/request?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a request-reply pattern with a specific, known agent and want a correlated, signed receipt confirming delivery — especially when you want the recipient's reply to be cost-free for them. Prefer it over broadcast or batch messaging endpoints when targeting a single agent for a delegated task or question.
Side effects
- Target agent not found or unregistered — endpoint returns an error or undelivered status
- Malformed input object (missing required 'type' or 'method' fields) — request rejected with validation error
- Payment failure — x402 payment of $0.002 USDC not processed, conversation not opened
- Target agent inbox full or unreachable — delivery fails with error, no receipt issued
- Network timeout before reply is correlated — caller receives no response object
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "msg_000124",
"note": "reply via POST /v1/reply is free",
"receipt": {
"id": "msg_000124",
"sig": "hmac…"
},
"delivered": true
}
}Tags
x402
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