ToolVet
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Evm Abi Decode

by EVM & Solana Utility Tools in Onchain & crypto

x402 APIPassing, checked 2 h ago

Strict Solidity ABI calldata decoder — decode canonical EVM smart-contract function calls or typed values, verify selectors, and reject ambiguous offsets or padding.

POST
https://chain-tools.use.x402atlas.com/evm/abi-decode
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
431 ms
500 ms slowest 5%
Last check
Passed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed

How to call it

POST https://chain-tools.use.x402atlas.com/evm/abi-decode

Each call costs $0.005 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://chain-tools.use.x402atlas.com/evm/abi-decode
content-type: application/json

{
  "data": "0xa9059cbb000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8",
  "function": "transfer",
  "has_selector": true,
  "types": [
    "address",
    "uint256"
  ]
}

Parameters

ParameterTypeRequiredDescription
datastringYesAt most 64 KiB of canonical ABI bytes; decoded dynamic arrays and tuples are rejected above 256 aggregate scalar values, with a selector exactly when has_selector is true
functionstringNoFunction identifier required exactly when a selector is present
has_selectorbooleanYesWhether the first four bytes are a function selector
typesarray of stringYesSupported ABI types used as the decoding schema; fixed shapes and decoded dynamic tails together may contain at most 256 scalar values

Example response

The provider's example. We can't check it without paying.

{
  "algorithm_version": "solidity-abi-v1",
  "function_signature": "transfer(address,uint256)",
  "has_selector": true,
  "operation": "abi-decode",
  "payload": "0x000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8",
  "selector": "0xa9059cbb",
  "types": [
    "address",
    "uint256"
  ],
  "values": [
    "0x0000000000000000000000000000000000000001",
    "1000"
  ],
  "warnings": []
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://chain-tools.use.x402atlas.com/evm/abi-decode' \
  -H 'content-type: application/json' \
  --data-raw '{"data":"0xa9059cbb000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8","function":"transfer","has_selector":true,"types":["address","uint256"]}'

# 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://chain-tools.use.x402atlas.com/evm/abi-decode' \
  -H 'content-type: application/json' \
  --data-raw '{"data":"0xa9059cbb000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8","function":"transfer","has_selector":true,"types":["address","uint256"]}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fchain-tools.use.x402atlas.com%2Fevm%2Fabi-decode&method=POST
const res = await pay("https://chain-tools.use.x402atlas.com/evm/abi-decode", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "data": "0xa9059cbb000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8",
    "function": "transfer",
    "has_selector": true,
    "types": [
      "address",
      "uint256"
    ]
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://chain-tools.use.x402atlas.com/evm/abi-decode",
        json={
            "data": "0xa9059cbb000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000003e8",
            "function": "transfer",
            "has_selector": True,
            "types": [
                "address",
                "uint256",
            ],
        },
    )
    print(res.status_code, res.text)

Security scan

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