x402engine — Simulate EVM transactions before sending — get gas estimates, execu
x402engine — Simulate EVM transactions before sending — get gas estimates, execution traces, and revert reasons
Not tested: has real-world effectsour last check, 2026-10-18
0 of 0checks answered this week
n/amedian answer time
$0.01listed price per call
n/aprice it asked us
Paid test badge: not yet. The checks above are free: we call the tool without paying and read the payment request it sends back. The Verified badge needs paid calls whose answers match the promised output, and nobody can buy a badge.
Endpoint
POST https://x402engine.app/api/tx/simulate
| Category | Code and developer |
|---|---|
| Provider host | x402engine.app |
| Networks | eip155:4326, eip155:8453, solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
We never call tools that send, buy, move money or file anything, not even without paying.
Example input (from the provider)
{
"body": {
"from": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"network_id": "1",
"to": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"value": "0"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"data": {
"description": "Transaction calldata (hex string)",
"type": "string"
},
"from": {
"description": "Sender address",
"example": "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045",
"type": "string"
},
"gas": {
"description": "Gas limit",
"type": "number"
},
"network_id": {
"description": "Network ID (1=mainnet, 8453=Base, 10=Optimism, etc.)",
"example": "1",
"type": "string"
},
"to": {
"description": "Recipient/contract address",
"example": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
"type": "string"
},
"value": {
"description": "ETH value in wei",
"example": "0",
"type": "string"
}
},
"required": [
"network_id",
"from",
"to"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"bodyType",
"body",
"method"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}