x402 API setup + directory listing, done for you

Get paid by AI agents. We make your API x402-ready (USDC on Base, paid to your wallet), add the discovery files agents and crawlers read, and list it on the x402 directories that work today. We skip the dead ones and the ones that charge to list. Our own service, LaunchCheck, is listed this way on 10+ directories.

Packages

Package	Price	Includes
Listing only	20 USDC	For APIs that already return a valid x402 402. We verify the challenge, write the listing copy, submit to every free working directory, and report status.
Setup + listing	35 USDC	Everything above, plus an x402 payment gate on up to 3 routes (Workers/Node/Hono/Express), bazaar metadata, `/.well-known/x402.json`, `openapi.json`, `llms.txt`.
Full	50 USDC	Everything above for up to 6 routes, plus facilitator verify tests, a free preview route, and a re-check and fix round 7 days later.

Prefer to do it yourself? Get the $5 x402 Starter Kit below.

Do it yourself: x402 Starter Kit, $5

A self-serve zip (v1.0.0, MIT): a Cloudflare Worker x402 paywall in TypeScript with tests, a Python/FastAPI paywall with tests, a TypeScript paying client, an .env.example that starts on Base Sepolia testnet, and test-all.sh. Price: 5.00 USDC on Base, paid to 0x751a4c3841bE287544C371B4EE09Bd3366AeA7cf.

How to buy (x402)

Free details: GET /x402-starter/info
GET https://quickbuild.quynguyenbac.workers.dev/x402-starter without payment returns 402 with the x402 v2 challenge in the PAYMENT-REQUIRED header (also in the body).
Pay with any x402 v2 client, for example @x402/fetch: const res = await wrapFetchWithPayment(fetch, signer)("https://quickbuild.quynguyenbac.workers.dev/x402-starter"), then save await res.arrayBuffer() as x402-starter-kit-v1.0.0.zip.
Check the file: sha256sum x402-starter-kit-v1.0.0.zip should print
17aa22acca501684cf688cf767753d4dc7a9d79ec6484257f9545e69e7096fcf

Errors (4xx/5xx) are not charged. Listed in /.well-known/x402.json.

You get (done-for-you packages)

A working 402 payment challenge on the agreed routes (as code or a patch you deploy)
Discovery files
A listing report: each directory, your listing link, and its status
Listing copy you can reuse

Turnaround

Listing only: 2 business days. Setup + listing: 3–4. Full: 5, plus the 7-day re-check. Some directories review or probe on a cycle, so a listing may still show "queued" or "pending" at handoff.

What we need from you

Your API URL or code, plus the routes and prices you want to charge
A public Base wallet address. Never send private keys or seed phrases.
Service name, a short description, and a contact email for the listings

Not included

Paid directory fees, custom domains, hosting, or gas
Guaranteed traffic, sales, or acceptance by reviewers
Building your API's core features
Illegal or deceptive services
Clients in Vietnam (we serve international clients only)

Done-for-you packages are not paid online yet (the $5 kit is, via x402). Email quickbuild@mail.grokbot.com with your API URL and we'll reply with a fixed quote.