Check

{
  "checked_at": 1791331200,
  "methodology": "/methodology",
  "onchain": [
    {
      "all_usdc_in": {
        "distinct_payers": 17,
        "transfers": 131
      },
      "coverage": {
        "complete": true,
        "fraction": 1
      },
      "excluded_payers": 0,
      "network": "eip155:8453",
      "pay_to": "0x1111111111111111111111111111111111111111",
      "status": "ok",
      "x402_style": {
        "distinct_payers": 14,
        "median_amount_usdc": 0.01,
        "repeat_payer_share": 0.5,
        "top1_payer_share": 0.3,
        "transfers": 120
      }
    }
  ],
  "probe": {
    "challenge": {
      "offers": [
        {
          "amount_atomic": 10000,
          "network": "eip155:8453",
          "pay_to": "0x1111111111111111111111111111111111111111",
          "scheme": "exact"
        }
      ],
      "version": 2
    },
    "rails": [
      "x402:v2"
    ],
    "status": 402,
    "valid": true
  },
  "url": "https://api.example.com/paid-endpoint"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://api.provenpaid.com/v1/check?url=https%3A%2F%2Fapi.example.com%2Fpaid-endpoint'

# 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://api.provenpaid.com/v1/check?url=https%3A%2F%2Fapi.example.com%2Fpaid-endpoint' \
  | 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 $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
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 $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.provenpaid.com%2Fv1%2Fcheck
const res = await pay("https://api.provenpaid.com/v1/check?url=https%3A%2F%2Fapi.example.com%2Fpaid-endpoint");
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 $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://api.provenpaid.com/v1/check?url=https%3A%2F%2Fapi.example.com%2Fpaid-endpoint")
    print(res.status_code, res.text)