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x402 Scraping API: web data your agent pays for per call

Try FastAF free on testnet. Point your agent at GET https://api.fastaf.co/x402/v1/demo/search?query=... on Base Sepolia. It costs $0.001 in test USDC from the Circle faucet, returns up to 3 real results, and allows 5 paid calls per IP per day. When it works, switch to /x402/v1/serp on Base mainnet ($0.005 per call). Copy-paste example: fastaf-mcp/examples/agentkit-x402.

FastAF exposes all 16 endpoints over x402 v2: GET https://api.fastaf.co/x402/v1/{endpoint} with the same query parameters as the keyed API. No account, no API key: the first request returns HTTP 402 with the exact price, your x402 client signs a USDC authorization on Base and retries. Payment is settled only if the request succeeds. Price = credit cost × $0.001 USDC.

Prices per endpoint (live 402 quotes, default variant, 2026-10-25)

Endpoint What it returns Price (USDC)
amazon Amazon product data / search $0.001
youtube YouTube transcript & metadata $0.001
serp Google web search $0.005
maps Google Maps & places $0.005
news Google News $0.005
scholar Google Scholar $0.005
jobs Google Jobs $0.005
scrape Any URL: HTML, markdown, links, AI extraction $0.005
screenshot Website screenshot $0.005
walmart Walmart products $0.005
zillow Zillow listings $0.005
ebay eBay listings / item $0.005
x Public X profile $0.005
shopping Google Shopping $0.010
ai Google AI answers with citations $0.010
linkedin Public LinkedIn profile $0.060

Options can change the price (e.g. serp with advance_search=true = 10 credits); always pay the amount in the live challenge. Full schemas: openapi.json, discovery: /.well-known/x402. Browse endpoints on /apis/.

The real 402 response

GET https://api.fastaf.co/x402/v1/serp?query=best%20espresso%20machine without payment → HTTP/2 402. JSON body (excerpt):

{
  "error": {
    "code": "payment_required",
    "message": "Payment is required for this request."
  },
  "price": {
    "usd": "0.005000",
    "credits": 5,
    "asset": "USDC",
    "network": "eip155:8453"
  },
  "how_to_pay": "Sign the PAYMENT-REQUIRED challenge with an x402 v2 client (for example @x402/fetch) and retry with PAYMENT-SIGNATURE. Settled only if the request succeeds.",
  "docs": "https://fastaf.co/docs/#x402",
  "x402Version": 2
}

The PAYMENT-REQUIRED header (base64) decodes to (excerpt):

{
  "x402Version": 2,
  "resource": {
    "url": "https://api.fastaf.co/x402/v1/serp?query=best%20espresso%20machine"
  },
  "accepts": [
    {
      "scheme": "exact",
      "network": "eip155:8453",
      "amount": "5000",
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "payTo": "0x05B75e13f071A09A26B50a18Ce5BD02a0755d76F",
      "maxTimeoutSeconds": 300,
      "extra": {
        "name": "USD Coin",
        "version": "2"
      }
    }
  ]
}

amount: "5000" = 0.005 USDC (6 decimals); the asset is USDC on Base.

Pay in USDC: minimal code (TypeScript)

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPaymentFromConfig } from "@x402/fetch";
import { ExactEvmScheme } from "@x402/evm";
import { privateKeyToAccount } from "viem/accounts";

const account = privateKeyToAccount(process.env.AGENT_WALLET_KEY as `0x${string}`); // wallet holding USDC on Base
const pay = wrapFetchWithPaymentFromConfig(fetch, {
  schemes: [{ network: "eip155:8453", client: new ExactEvmScheme(account) }],
});

const res = await pay("https://api.fastaf.co/x402/v1/serp?query=best%20espresso%20machine");
console.log(res.status, res.headers.get("X-FastAF-Credits-Used"));
console.log(await res.json());

Based on the official @x402/fetch README (coinbase/x402). The 200 response carries the data, X-FastAF-Credits-Used and a PAYMENT-RESPONSE settlement receipt.

x402 or prepaid credits?

x402 API key + credits
Account None Email signup (2 free calls)
Price $0.001/credit Packs $10–$799, cheaper at volume (Google search $1.33–$2.50/1k)
MCP Not for x402 (MCP tool calls need a key) Hosted MCP, 16 tools
Failed calls Not settled Not charged

FAQ

Which network and token? USDC on Base (eip155:8453), scheme exact, x402 v2. Am I charged for blocked or empty pages? No: only successful calls are settled. Do I need an API key? No for x402. Yes for MCP tool calls and prepaid credits. Where are the docs? fastaf.co/docs/#x402 and guides on the blog.

Sources

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