# X402-Preflight

> x402 preflight: before your agent signs a payment, fetch a paywalled URL's 402 and lint it. Parses v1 bodies and v2 PAYMENT-REQUIRED headers, then checks each accepts[] option: known network, canonical USDC, EIP-712 domain (extra.name/version) that a signature will verify against, EIP-55 payTo, zero/contract payTo, amount sanity, timeout, testnet, resource-host mismatch. Returns ok/warn/block per option, findings and the recommended option.

- **Domain**: `x402-preflight.nextill-pos.workers.dev`
- **Provider**: x402-preflight.nextill-pos.workers.dev (https://x402-preflight.nextill-pos.workers.dev/)
- **Kind**: paid_api
- **Live-responds (last probe)**: None
- **Signed card**: False
- **Streaming**: False
- **Quality score**: 70%
- **Payment protocol**: x402 · network `eip155:8453` · ≥ $0.003
- **Wallet**: `0xb3cddccee6b150c8effd55b961afc0ecefe7f247`

## URLs
- Agent card: https://x402-preflight.nextill-pos.workers.dev/
- Page (HTML): https://agenstry.com/agents/x402-preflight.nextill-pos.workers.dev
- Documentation: https://x402-preflight.nextill-pos.workers.dev/v1/preflight