Extract

{
  "description": "Pay-per-call APIs for AI agents via x402 on Base: web fetch, HTTP proxy, page extract, and crypto market data.",
  "elapsedMs": 120,
  "fieldErrors": {},
  "fields": {
    "heading": "Pay-per-call APIsbuilt for agents.",
    "links": [
      "https://horizonpulse.dev/",
      "https://horizonpulse.dev/#catalog",
      "https://horizonpulse.dev/#how"
    ]
  },
  "finalUrl": "https://horizonpulse.dev/",
  "headings": [
    {
      "level": 1,
      "text": "Pay-per-call APIs built for agents."
    },
    {
      "level": 2,
      "text": "Thirteen routes. One protocol."
    }
  ],
  "language": "en",
  "links": [
    {
      "href": "https://horizonpulse.dev/",
      "text": "Horizon Pulse"
    },
    {
      "href": "https://horizonpulse.dev/#catalog",
      "text": "Catalog"
    }
  ],
  "matchedFields": 2,
  "ok": true,
  "requestedFields": 2,
  "textSample": "# Horizon Pulse\n\nLive on Base · x402 v2\n# Pay-per-call APIs\n built for agents.\n\n13 routes for market data, the web and d…",
  "title": "Horizon Pulse",
  "url": "https://horizonpulse.dev/"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://horizonpulse.dev/api/extract?url=https%3A%2F%2Fhorizonpulse.dev'

# 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 - 'https://horizonpulse.dev/api/extract?url=https%3A%2F%2Fhorizonpulse.dev' \
  | 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 $0.015 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.015" });
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 $0.015 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fhorizonpulse.dev%2Fapi%2Fextract
const res = await pay("https://horizonpulse.dev/api/extract?url=https%3A%2F%2Fhorizonpulse.dev");
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 $0.015 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.015"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://horizonpulse.dev/api/extract?url=https%3A%2F%2Fhorizonpulse.dev")
    print(res.status_code, res.text)