Issue 320 x402 discovery - #369
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closes #320
Summary
Adds standardized x402 discovery metadata at /.well-known/x402 so autonomous clients can discover StellarSearch’s paid resources and payment requirements without scraping human documentation.
Changes
Added a shared runtime-configured x402 discovery metadata builder.
Added Express support for GET /.well-known/x402.
Added the matching Vercel serverless handler and root-path rewrite.
Advertised resource templates for /search, /images, and /news.
Included active Stellar networks, Soroban USDC contract, exact payment scheme, amount, currency, and receiving address.
Added canonical priceDiscoveryUrl generation with optional PUBLIC_BASE_URL support.
Added five-minute cache headers for discovery responses.
Updated the Vercel service index and README documentation.
Added unit and API-level coverage for metadata shape, runtime configuration, URL derivation, method restrictions, and cross-runtime behavior.
Verification
205 tests passed across 18 test files.
Production build passed.
TypeScript validation passed.
git diff --check passed.
Existing payment approval, x402 verification, replay protection, and settlement behavior remains unchanged.
Branch
issue-320-x402-discovery