x402 · base · USDC

URL in.
Clean Markdown out.

URL to clean, LLM-ready Markdown or JSON. Strips scripts, nav, and boilerplate; keeps headings, lists, tables, and code blocks. JSON mode adds the page title; every response carries a fetch timestamp. No signup, no API key — pay per call.

$0.01 per call
pay per request — no signup, no key
failed extracts cost nothing

Read the x402 manifest

Call it

Any x402 client works. The endpoint answers an unpaid request with a 402 carrying the payment requirements below; your client signs a USDC transfer authorization and retries. You never hold an account with us.

JavaScript

import { createWalletClient, http } from "viem";
import { privateKeyToAccount } from "viem/accounts";
import { base } from "viem/chains";
import { wrapFetchWithPayment } from "x402-fetch";

const client = createWalletClient({
  account: privateKeyToAccount(process.env.PRIVATE_KEY),
  transport: http(),
  chain: base,
});
const fetchWithPay = wrapFetchWithPayment(fetch, client);

const res = await fetchWithPay("https://api.nightcobbler.com/v1/extract", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({ url: "https://example.com", format: "markdown" }),
});

const { content } = await res.json();

See the challenge first

This costs nothing and signs nothing — it returns the 402 and its terms, so you can inspect exactly what you would be paying.

curl -s -X POST https://api.nightcobbler.com/v1/extract \
  -H 'content-type: application/json' \
  -d '{"url":"https://example.com","format":"markdown"}'

Request

POST https://api.nightcobbler.com/v1/extract with a JSON body.

Field	Type	Notes
`url` required	`string`	Absolute `http(s)` URL to fetch.
`format`	`"markdown" \| "json"`	Defaults to `markdown`.

Response

Field	Type	Notes
`url`	`string`	The URL that was fetched.
`format`	`string`	Echoes the format served.
`content`	`string`	Extracted body — scripts, nav, and boilerplate removed; headings, lists, tables, and code blocks kept. In `markdown` mode this is the Markdown itself; in `json` mode it is a JSON string of `{"title","markdown"}`, so the page title is available there.
`fetched_at`	`string`	ISO-8601 timestamp of the fetch.

Payment terms

Served verbatim by the paywall — the same values this page's manifest and every 402 response carry.

Resource: https://api.nightcobbler.com/v1/extract
Scheme: exact
Network: base (mainnet)
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Amount: 10000 ($0.01)
Pay to: 0x66F2da460e9C25834460A5ef1FCE983703400AC4
Timeout: 60s

What we promise

You are only charged for a result. Settlement runs after the route responds and only on a success — an unreachable host, a bad URL, or an error on our side returns a 4xx/5xx and takes no payment.

Rate limits: 30 requests/minute per IP and 300/minute across the service, answered with 429 and a Retry-After header. A rate-limited request is rejected before the paywall, so it is never charged either.

We log the hostname you fetch, never the full URL — paths and query strings can carry your secrets, so they are dropped before anything is written.

URL in.Clean Markdown out.