feat: x402 server-side middleware for automatic 402 payment handling#19
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feat: x402 server-side middleware for automatic 402 payment handling#19
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Adds X402Middleware that intercepts HTTP 402 responses and automatically pays on-chain via PaymentClient, then retries with X-Payment-Proof header. - Supports exact (direct transfer) and escrow payment schemes - Policy enforcement: max payment cap, recipient allowlist, gas budget - Payment history tracking and spend summaries - 15 tests covering offer parsing, validation, payment execution Closes #16 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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Summary
X402Middlewarethat intercepts HTTP 402 responses and automatically pays on-chainPaymentClientX-Payment-Proofheader on retryCloses #16
Test plan
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