x402-endpoint-readiness

Changes to Run a live x402 endpoint readiness check before payment

post/api/agent/pay/v2

Jul 31, 2026d5ba2c6ebe80 Revision changes
- breaking
  the request property became required
- info
  api tag live-endpoint-probe added
- info
  api tag x402-endpoint-readiness added
- info
  api tag x402-validator added
- info
  the request property became optional
- info
  the request property default value strict was added