feat(#4557): wire X402PaymentGate into the serve surfaces#228
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Follow-on to #4527. X402PaymentGate wraps a JDK HttpHandler, but the serve surfaces created their HttpServer internally with no injection point — so you couldn't put x402 in front of them. Now `NlWebServer.from`, `AgUiServer.from`, and `A2AServer.from` take an optional `payment: X402PaymentGate? = null` and wrap their invocation handler (payment?.gate(h) ?: h). An agent can now monetize its served endpoint directly: `NlWebServer.from(agent, payment = gate).start()`. - A2A: only the RPC path is gated; the /.well-known agent-card discovery stays FREE. - McpServer intentionally NOT gated here — it wants a granular paidTool() (per-tool pricing) per PRD §12.8, a separate follow-up, not a blanket endpoint gate. - 2 hermetic integration tests (NlWeb + AG-UI gated by a fake facilitator). README + CHANGELOG + internals adjunct updated. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
Follow-on to #4527 (#4557): wire
X402PaymentGateinto the serve surfaces so an agent can monetize its served endpoint directly.X402PaymentGatewraps a JDKHttpHandler, but the serve surfaces build theirHttpServerinternally with no injection point — so x402 couldn't actually front them until now.Change
payment: X402PaymentGate? = nullonNlWebServer.from/AgUiServer.from/A2AServer.from; each wraps its invocation handler (payment?.gate(h) ?: h)./.well-known/agent-card.jsondiscovery endpoint stays free (you must be able to read the terms before paying).paidTool()(per-tool pricing) per PRD §12.8, a separate follow-up, not a blanket endpoint gate.Gates
2 hermetic integration tests (NLWeb + AG-UI gated by a fake facilitator:
402withoutX-PAYMENT, served with it). Full./gradlew buildgreen. README + CHANGELOG + internals adjunct updated. Closes #4557.🤖 Generated with Claude Code