ToolVet
81trust / 100

Tx Simulate

by Transaction simulation in Onchain & crypto

x402 APIPassing, checked 4 h ago

Dry-run a prospective smart-contract call or transaction without broadcasting it: executes eth_call and eth_estimateGas against the latest block over the same keyless multi-endpoint public RPC pool as /api/evm-rpc (ethereum, base, polygon, arbitrum, optimism). Returns the return data and a gas estimate on success, or {success:false} with the revert reason when the call would fail. Strictly read-only - nothing is signed or broadcast.

POST https://agent402.tools/api/tx-simulate

Last 30 days

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Uptime
100%
Response time
223 ms typical, 223 ms slowest 5%
Last check
4 h ago
Next check
any minute now

How to call it

# See the payment challenge (nothing is charged)
curl -i -X POST "https://agent402.tools/api/tx-simulate" \
  -H "content-type: application/json" \
  -d '{"data":"0x70a08231000000000000000000000000abf4fabd7c416fb67202e5f9002389fc75e2a9d0","network":"base","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}'
import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { ExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client().register(
  "eip155:8453",
  new ExactEvmScheme(privateKeyToAccount(process.env.AGENT_KEY)),
);
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? Preflight it first for $0.005:
// GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagent402.tools%2Fapi%2Ftx-simulate
const res = await pay("https://agent402.tools/api/tx-simulate", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({"data":"0x70a08231000000000000000000000000abf4fabd7c416fb67202e5f9002389fc75e2a9d0","network":"base","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}),
});
console.log(await res.json());

Example input

{
  "data": "0x70a08231000000000000000000000000abf4fabd7c416fb67202e5f9002389fc75e2a9d0",
  "network": "base",
  "to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}

Example output

{
  "gasEstimate": 31234,
  "network": "base",
  "returnData": "0x00000000000000000000000000000000000000000000000000000000000f4240",
  "revertReason": null,
  "success": true
}

Security scan

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

Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402223 ms$0.005