Veyline Developer Primer — x402 Paid API Starter Kit

Veyline Developer Primer — x402 Paid API Starter Kit is an app source code product available on the Whop marketplace, created by Payload and launched in October 2026.

Drop-in Express middleware that charges AI agents per API call using the x402 payment flow. Unpaid requests get a 402 with payment requirements; paid requests flow through. Each route sets its own asset, network, and price. Multi-asset: not hard-coded to USDC — each paid route can use another supported asset (USDC is default). Settlement depends on asset/network combinations supported by your x402 facilitator. No asset is advertised as settlement-verified: live on-chain settlement testing is in progress. Facilitator-aware: declare your facilitator's supported assets and networks, and misconfigured routes fail at startup instead of at payment time. Setup: 1) npm install, 2) set receiver address, asset, network, and prices, 3) point the verifier at your facilitator. Includes a dev verifier for local testing, an append-only payment ledger, and a /.well-known/x402 discovery manifest. Includes: paid-route middleware, dev + facilitator verifiers, JSONL usage ledger, manifest generator, example server, 61 automated tests, README quick start. Developer tooling for API monetization. Non-custodial: no custody of funds, no trade execution, no investment advice, no guaranteed income. Support: [Support](mailto:[email protected]?subject=Veyline%20Support%20Request) v1.0.4 — x402 v1 wire-format fix: the facilitator verifier now posts the canonical {paymentPayload, paymentRequirements} envelope and converts amounts to base units. Verified live against x402.org.

Veyline Developer Primer — x402 Paid API Starter Kit has is priced at $79 (one-time payment).

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