feat: add A2A (Agent-to-Agent) x402 payment endpoint#41
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Implements the two-leg A2A x402 handshake so other agents can call and pay this service programmatically without a human in the loop. Protocol: https://github.com/google-a2a/a2a-x402/v0.1 POST /a2a Content-Type: application/json Body: JSON-RPC { method: message/send, params: { message: {...} } } Leg 1 — caller sends message without payment: Returns task state input-required with x402.payment.required in message metadata, advertising the USDC amount, contract, and payTo. Leg 2 — caller re-sends with x402.payment.status: payment-submitted and the signed EIP-3009 authorization in x402.payment.payload: Verifies with x402.org facilitator, generates image via Nova Canvas, settles (deferred, only on success), returns completed task with image artifact and x402.payment.receipts. The endpoint is framework-agnostic: any A2A-compliant caller that can sign USDC EIP-3009 authorizations can consume it without modifying the agent code.
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Implements the two-leg A2A x402 handshake so other agents can call and pay this service programmatically without a human in the loop.
Protocol: https://github.com/google-a2a/a2a-x402/v0.1
POST /a2a Content-Type: application/json
Body: JSON-RPC { method: message/send, params: { message: {...} } }
Leg 1 — caller sends message without payment:
Returns task state input-required with x402.payment.required in
message metadata, advertising the USDC amount, contract, and payTo.
Leg 2 — caller re-sends with x402.payment.status: payment-submitted
and the signed EIP-3009 authorization in x402.payment.payload:
Verifies with x402.org facilitator, generates image via Nova Canvas,
settles (deferred, only on success), returns completed task with
image artifact and x402.payment.receipts.
The endpoint is framework-agnostic: any A2A-compliant caller that can sign USDC EIP-3009 authorizations can consume it without modifying the agent code.
Issue #, if available:
Description of changes:
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