Contracts Events

{
  "data": {
    "address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
    "chainId": 1,
    "events": [
      {
        "address": "0xdac17f958d2ee523a2206206994597c13d831ec7",
        "blockNumber": 26096644,
        "data": "0x000000000000000000000000000000000000000000000000000000000fba2bcd",
        "decodeStatus": "ambiguous",
        "decoded": {
          "args": [
            {
              "indexed": true,
              "name": "from",
              "type": "address",
              "value": "0x1b48edcd9e560438ead6cd0bcc2fbbb70e63c8f3"
            }
          ],
          "candidateCount": 3,
          "name": "Transfer"
        },
        "logIndex": 677,
        "logIndexInTx": 0,
        "timestamp": 1790847779,
        "topics": [
          "0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef"
        ],
        "txHash": "0x2cf0f32ea98eac1fb0fffeb4efdc95c989a3cc071468aad6339dc99ec56bb19d",
        "txIndex": 279
      }
    ],
    "nextCursor": "AVsyNjA5NjY0NCw2MzhdEvfMvNrIUGNSp3keNMJzAw"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address/events?limit=10'

# 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://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address/events?limit=10' \
  | 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 $0.1 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.1" });
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 $0.1 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmpp.tracefast.xyz%2Fapi%2Fv1%2Fchains%2F1%2Fcontracts%2F%3Aaddress%2Fevents
const res = await pay("https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address/events?limit=10");
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 $0.1 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.1"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://mpp.tracefast.xyz/api/v1/chains/1/contracts/:address/events?limit=10")
    print(res.status_code, res.text)