Transactions Failures

{
  "data": {
    "blockNumber": 24999991,
    "chainId": 1,
    "frameCount": 3,
    "frames": [
      {
        "callDepth": 1,
        "callPath": "0000",
        "callType": "CALL",
        "errorKind": "Revert",
        "errorName": "Error",
        "errorSignature": "Error(string)",
        "from": "0xd8da6bf26964af9d7eed9e03e53415d37aa96045",
        "gasUsed": 28671,
        "revertData": "0x08c379a000000000000000000000000000000000000000000000000000000000…",
        "revertDataLength": 132,
        "revertDataTruncated": false,
        "revertSelector": "0x08c379a0",
        "status": "Revert",
        "to": "0x7a250d5630b4cf539739df2c5dacb4c659f2488d"
      }
    ],
    "framesTruncated": false,
    "hash": "0x3602a64b41d7f65b2bf2a6d1da75c0fb817bbe17874c4e884b7e2d26cb80253a"
  }
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://mpp.tracefast.xyz/api/v1/chains/1/transactions/:hash/failures'

# 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/transactions/:hash/failures' \
  | 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%2Fmpp.tracefast.xyz%2Fapi%2Fv1%2Fchains%2F1%2Ftransactions%2F%3Ahash%2Ffailures
const res = await pay("https://mpp.tracefast.xyz/api/v1/chains/1/transactions/:hash/failures");
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://mpp.tracefast.xyz/api/v1/chains/1/transactions/:hash/failures")
    print(res.status_code, res.text)