ToolVet
78trust / 100

Tx Dryrun

by TrollBridge in Onchain & crypto

x402 APIPassing, checked 3 h ago

NOT AN AUDIT — simulation, not a guarantee: the crystal ball — simulate any transaction before signing and get a plain-words explanation of what it does to your wallet (approvals, transfers, swaps decoded). Verdict: safe, review-carefully, or do-not-sign. Toll: $0.02 USDC on Base or Solana.

GET
https://mini-tollbooth.onrender.com/tx-dryrun
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
227 ms
607 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

How to call it

GET https://mini-tollbooth.onrender.com/tx-dryrun

Each call costs $0.02 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.

GET https://mini-tollbooth.onrender.com/tx-dryrun?chain=base&data=0x095ea7b3&from=0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Parameters

ParameterTypeRequiredDescription
chainstringNoWhich chain (default base). One of: base, ethereum.
datastringYesHex calldata of the transaction (0x…).
fromstringYesWallet address that would send the transaction (0x…).
tostringYesTarget contract address the transaction calls (0x… on Base or Ethereum).
valuestringNoNative currency value in wei, decimal or 0x… hex (default 0).

Example response

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

{
  "chain": "base",
  "description": "NOT AN AUDIT — simulation, not a guarantee: the crystal ball — simulate any transaction before signing and get a plain-words explanation of what it does to your wallet (approvals, transfers, swaps decoded). Verdict: safe, review-carefully, or do-not-sign.",
  "explanation": "This grants 0x… unlimited rights to move your USDC.",
  "from": "0x...",
  "lane": "/tx-dryrun",
  "simulation": {
    "reverted": false
  },
  "to": "0x...",
  "verdict": "review-carefully"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://mini-tollbooth.onrender.com/tx-dryrun?chain=base&data=0x095ea7b3&from=0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'

# 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://mini-tollbooth.onrender.com/tx-dryrun?chain=base&data=0x095ea7b3&from=0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fmini-tollbooth.onrender.com%2Ftx-dryrun
const res = await pay("https://mini-tollbooth.onrender.com/tx-dryrun?chain=base&data=0x095ea7b3&from=0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913");
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://mini-tollbooth.onrender.com/tx-dryrun?chain=base&data=0x095ea7b3&from=0x8BE8D056d5F0bEF850eC9ed5C4a8d647cBE896C0&to=0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913")
    print(res.status_code, res.text)

Security scan

No findings

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Recent checks

WhenResultHTTPTimePrice
3 h agoPassed402216 ms$0.02
8 h agoPassed402254 ms$0.02
12 h agoPassed402253 ms$0.02
16 h agoPassed402244 ms$0.02
20 h agoPassed402611 ms$0.02
Show 10 older checks
25 h agoPassed402206 ms$0.02
29 h agoPassed402267 ms$0.02
33 h agoPassed402218 ms$0.02
36 h agoPassed402223 ms$0.02
40 h agoPassed402248 ms$0.02
44 h agoPassed402227 ms$0.02
2 days agoPassed402201 ms$0.02
2 days agoPassed402216 ms$0.02
2 days agoPassed402188 ms$0.02
2 days agoPassed402279 ms$0.02