ToolVet
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Chain Calldata

by Tanod chainpeek in Onchain & crypto

x402 APIPassing, checked 1 h ago

chainpeek (Tanod) calldata decode: decode EVM transaction calldata with a given signature, or look the selector up and return every candidate that decodes cleanly (unverified hints). Read-only.

POST https://tanod.dev/v1/chain/calldata

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Status and outage history · Atom feed

Uptime
100%
Response time
276 ms typical, 389 ms slowest 5%
Last check
1 h ago
Next check
any minute now

How to call it

POST https://tanod.dev/v1/chain/calldata

Each call costs $0.003 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://tanod.dev/v1/chain/calldata
content-type: application/json

{
  "calldata": "0xa9059cbb000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e8",
  "signature": "transfer(address,uint256)"
}

Parameters

ParameterTypeRequiredDescription
calldatastringYes0x-prefixed calldata hex (at least a 4-byte selector).
signaturestring or nullNoOptional function signature, e.g. transfer(address,uint256); omit to look the selector up and return every clean decode. Default: null.

Example response

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

Example response, 38 lines
{
  "best": {
    "args": [
      {
        "type": "address",
        "value": "0x0000000000000000000000000000000000000001"
      },
      {
        "type": "uint256",
        "value": "1000"
      }
    ],
    "name": "transfer",
    "signature": "transfer(address,uint256)"
  },
  "bytes": 68,
  "candidates": [
    "transfer(address,uint256)"
  ],
  "decoded": [
    {
      "args": [
        {
          "type": "address",
          "value": "0x0000000000000000000000000000000000000001"
        },
        {
          "type": "uint256",
          "value": "1000"
        }
      ],
      "name": "transfer",
      "signature": "transfer(address,uint256)"
    }
  ],
  "note": "signature database matches are unverified hints; selectors can collide",
  "selector": "0xa9059cbb"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://tanod.dev/v1/chain/calldata' \
  -H 'content-type: application/json' \
  --data-raw '{"calldata":"0xa9059cbb000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e8","signature":"transfer(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://tanod.dev/v1/chain/calldata' \
  -H 'content-type: application/json' \
  --data-raw '{"calldata":"0xa9059cbb000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e8","signature":"transfer(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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ftanod.dev%2Fv1%2Fchain%2Fcalldata&method=POST
const res = await pay("https://tanod.dev/v1/chain/calldata", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "calldata": "0xa9059cbb000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e8",
    "signature": "transfer(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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://tanod.dev/v1/chain/calldata",
        json={
            "calldata": "0xa9059cbb000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000003e8",
            "signature": "transfer(address,uint256)",
        },
    )
    print(res.status_code, res.text)

Security scan

  • No findings. We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
1 h agoPassed402265 ms$0.003
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