Web Metadata

{
  "data": {
    "alternates": [],
    "canonical": "https://apiacre.com",
    "description": "70 pay-per-call APIs for agents, settled in USDC on Base through x402.",
    "document": {
      "author": null,
      "charset": "utf-8",
      "generator": null,
      "robots": "index,follow",
      "viewport": "width=device-width,initial-scale=1"
    },
    "feeds": [],
    "headings": {
      "h1": [
        "Useful APIs. One call at a time."
      ],
      "h2Count": 2,
      "h3Count": 55
    },
    "icons": [],
    "language": "en",
    "openGraph": {
      "description": "Buy focused web, document, developer, research, and EVM results with USDC ove...",
      "image": null,
      "imageAlt": null,
      "title": "API Acre — Pay-per-call APIs on Base",
      "url": "https://apiacre.com"
    },
    "redirected": false,
    "requestedUrl": "https://apiacre.com/",
    "response": {
      "bodySha256": "3886972b5512bf62a93dbdf790af504cab300572de9837088909ebd4aa3a3b4e",
      "bytes": 21633,
      "contentType": "text/html; charset=utf-8",
      "elapsedMs": 42,
      "statusCode": 200
    },
    "structuredData": {
      "blocks": 1,
      "invalidBlocks": 0,
      "truncated": false,
      "types": [
        "Organization",
        "WebAPI"
      ],
      "validBlocks": 1
    },
    "title": "API Acre — Pay-per-call APIs on Base",
    "twitter": {
      "card": null,
      "description": null,
      "image": null,
      "imageAlt": null,
      "title": null
    },
    "url": "https://apiacre.com/"
  },
  "meta": {
    "cached": false,
    "duration_ms": 42,
    "next_actions": [
      {
        "method": "POST",
        "path": "/v1/web/extract",
        "reason": "Retrieve the same public URL as clean text or Markdown with bounded structure...",
        "service": "web.extract",
        "title": "Web content extraction"
      }
    ],
    "sources": [],
    "warnings": []
  },
  "request_id": "018f1f54-7f38-7ba2-8dc3-5f90272d9f1a",
  "service": "web.metadata",
  "version": "1"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://apiacre.com/v1/web/metadata' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://apiacre.com"}'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - -X POST 'https://apiacre.com/v1/web/metadata' \
  -H 'content-type: application/json' \
  --data-raw '{"url":"https://apiacre.com"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

// npm i @x402/fetch @x402/evm viem
import { wrapFetchWithPayment, x402Client } from "@x402/fetch";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

// Pays at most $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapiacre.com%2Fv1%2Fweb%2Fmetadata&method=POST
const res = await pay("https://apiacre.com/v1/web/metadata", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "url": "https://apiacre.com"
  }),
});
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://apiacre.com/v1/web/metadata",
        json={
            "url": "https://apiacre.com",
        },
    )
    print(res.status_code, res.text)