Transaction simulation · TX Simulate
$0.005
per call · USD Coin on Base
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.
Endpoint
POST https://agent402.tools/api/tx-simulate4
Calls / 30d
1
Unique payers / 30d
Aug 31
Last called
exact
Payment scheme
Call this service
import { wrapFetchWithPayment } from "@x402/fetch";
import { privateKeyToAccount } from "viem/accounts";
const account = privateKeyToAccount(process.env.PRIVATE_KEY);
const fetchWithPay = wrapFetchWithPayment(fetch, account);
const res = await fetchWithPay("https://agent402.tools/api/tx-simulate", {
method: "POST",
headers: { "Content-Type": "application/json" },
body: JSON.stringify({
"data": "0x70a08231000000000000000000000000abf4fabd7c416fb67202e5f9002389fc75e2a9d0",
"network": "base",
"to": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
}),
});
const data = await res.json();curl -X POST \
"https://agent402.tools/api/tx-simulate" \
-H "Content-Type: application/json" \
-d '{"data":"0x70a08231000000000000000000000000abf4fabd7c416fb67202e5f9002389fc75e2a9d0","network":"base","to":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"}' \
-H "X-PAYMENT: <signed x402 payment>"Example response
{
"gasEstimate": 31234,
"network": "base",
"returnData": "0x00000000000000000000000000000000000000000000000000000000000f4240",
"revertReason": null,
"success": true
}Payment details
0xabf4fabd7c416fb67202e5f9002389fc75e2a9d0USD Coin · 0x833589fcd6edb6e08f4c7c32d4f71b54bda02913Is this your API?
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