API · pay per call with x402

Landing page API: one call, one ready-to-publish HTML page.

Send a business name and a few details. You get back a complete, responsive, single-file HTML landing page with inline CSS: hero, services, WhatsApp or email call to action, contact section, footer, SEO meta tags and schema.org data. No account and no API key: each call is paid in USDC with the x402 protocol (HTTP 402).

See an example output Machine-readable description

Price and payment

0.25 USDC per page

Fixed price per successful call. Amount 250000 in atomic units (6 decimals).

Base or Polygon

USDC on Base (eip155:8453) or Polygon (eip155:137), scheme exact. Gasless for the payer (EIP-3009), settled by the PayAI facilitator.

You pay only for a result

Invalid input returns 400 before any payment is checked. The payment is settled only after the page has been generated.

Endpoint

POST https://landingen24h.com/api/x402/landing (JSON body) GET https://landingen24h.com/api/x402/landing?business_name=...&services=a,b,c

Supports x402 v1 (X-PAYMENT request header, X-PAYMENT-RESPONSE receipt) and v2 (PAYMENT-SIGNATURE / PAYMENT-REQUIRED / PAYMENT-RESPONSE). Response: {"html": "<!DOCTYPE html>...", "filename": "plomeria-rapida.html"}.

Input fields

`business_name`	string, required	Business or project name (max 80)
`tagline`	string	Headline for the hero (max 140)
`description`	string	One or two sentences about the business (max 600)
`services`	array of strings	Up to 8. Write "Title: short description" to add a description. In GET, comma-separated
`city`	string	City or area served
`whatsapp`	string	International number, digits only, e.g. 5491122334455. Adds WhatsApp buttons
`email`	string	Contact email. Adds an email button
`language`	"es" or "en"	Page language. Default es
`color`	hex	Brand color, e.g. #0f766e. Default #2563eb
`cta_text`	string	Text of the main button (max 40)

Try it with curl

curl -i -X POST https://landingen24h.com/api/x402/landing \ -H "Content-Type: application/json" \ -d '{"business_name":"Plomeria Rapida","tagline":"Plumbing repairs, same day","services":["Leak repair: detection and fix","Water heaters"],"city":"Buenos Aires","whatsapp":"5491122334455","language":"en","color":"#0f766e"}' # -> HTTP/2 402 with the payment requirements (JSON body = x402 v1, # PAYMENT-REQUIRED header = x402 v2). Pay with any x402 client and retry.

Pay automatically from code

// Node.js, x402 v1 client (npm i x402-fetch viem) import { wrapFetchWithPayment, decodeXPaymentResponse } from "x402-fetch"; import { privateKeyToAccount } from "viem/accounts"; const account = privateKeyToAccount(process.env.PRIVATE_KEY); // wallet with USDC on Base or Polygon const fetchWithPay = wrapFetchWithPayment(fetch, account); const res = await fetchWithPay("https://landingen24h.com/api/x402/landing", { method: "POST", headers: { "Content-Type": "application/json" }, body: JSON.stringify({ business_name: "Plomeria Rapida", language: "en", whatsapp: "5491122334455" }) }); const { html, filename } = await res.json(); console.log(filename, decodeXPaymentResponse(res.headers.get("x-payment-response")));

Any x402-compatible client or agent wallet works. The page is generated from a fixed template, so the same input always gives the same HTML. Nothing you send is stored.

Discovery

/api/x402: resources, price, networks and JSON schemas.
/.well-known/x402: x402 discovery document.
/openapi.json: OpenAPI 3.1 with x-payment-info.

Need a page written and published for you?

The API gives you the HTML. If you prefer a custom page with copy written for your business, hosting and one round of changes, see the done-for-you landing page service. Questions: [email protected].