r402-http

HTTP transport for the x402 payment protocol, part of the r402 workspace.

Highlights

Server Paygate + X402Middleware — Axum layer enforcing payments via ResourceServer (verify/settle hooks, cancel on handler failure), three settlement modes (sequential, concurrent, background), and HTTP-only PaygateHooks (API keys / KYT).
Client X402Client — thin reqwest_middleware adapter over r402_core::PaymentClient: 402 → sign → retry, plus on_payment_response with one corrective recovery.
Remote FacilitatorClient — /verify, /settle, /supported with 30s timeout, 429/5xx backoff, 10-minute /supported cache.
CORS — exposes Payment-Required and Payment-Response.

Feature	Surface
`client`	`reqwest_middleware`-based buyer middleware.
`server`	axum paygate / facilitator HTTP servers.
`facilitator`	`FacilitatorClient` for talking to a remote
	facilitator.
`telemetry`	OpenTelemetry tracing instrumentation.
`full`	All of the above.

Dual-licensed under MIT and Apache-2.0.