Evm Internal Txs

{
  "address": "0x4200000000000000000000000000000000000006",
  "has_more": true,
  "internal": [
    {
      "a": {
        "address": "0x4200000000000000000000000000000000000006",
        "contract": true,
        "ens": null,
        "name": "Wrapped Ether",
        "scam": null
      },
      "date": "2026-10-03T01:30:25.000000Z",
      "error": null,
      "from": {
        "address": "0xdDB9bA417506fe7528085a5c8445AEA78e5B2e43",
        "contract": true,
        "ens": null,
        "name": "CLGaugePositionManager",
        "scam": null
      },
      "native_value": 0,
      "success": true,
      "tx": "0x1067df59783f9d05a2ef34f59de803c227522ae7d037677b6af8be1fd98597de",
      "type": "call"
    },
    {
      "a": {
        "address": "0x4200000000000000000000000000000000000006",
        "contract": true,
        "ens": null,
        "name": "Wrapped Ether",
        "scam": null
      },
      "date": "2026-10-03T01:30:25.000000Z",
      "error": null,
      "from": {
        "address": "0xb2cc224c1c9feE385f8ad6a55b4d94E92359DC59",
        "contract": true,
        "ens": null,
        "name": null,
        "scam": null
      },
      "native_value": 0,
      "success": true,
      "tx": "0x1067df59783f9d05a2ef34f59de803c227522ae7d037677b6af8be1fd98597de",
      "type": "staticcall"
    }
  ],
  "network": "base",
  "source": "Blockscout (https://base.blockscout.com)"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.vextorium.com/v1/evm-internal-txs' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x4200000000000000000000000000000000000006","limit":2,"network":"base"}'

# 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://api.vextorium.com/v1/evm-internal-txs' \
  -H 'content-type: application/json' \
  --data-raw '{"address":"0x4200000000000000000000000000000000000006","limit":2,"network":"base"}' \
  | 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 $0.006 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.006" });
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 $0.006 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.vextorium.com%2Fv1%2Fevm-internal-txs&method=POST
const res = await pay("https://api.vextorium.com/v1/evm-internal-txs", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "address": "0x4200000000000000000000000000000000000006",
    "limit": 2,
    "network": "base"
  }),
});
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 $0.006 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.006"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.vextorium.com/v1/evm-internal-txs",
        json={
            "address": "0x4200000000000000000000000000000000000006",
            "limit": 2,
            "network": "base",
        },
    )
    print(res.status_code, res.text)