Simulate a transaction before signing it
Simulate a transaction before signing it: what leaves and enters the wallet (native, ERC-20, NFTs, SPL) with USD values, approvals granted (unlimited / to non-contracts), revert reason, gas and fee, plus a risk level. EVM chains via eth_simulateV1 (raw call: from, to, data, value); Solana via simulateTransaction (base64 transaction, unsigned is fine). Nothing is broadcast.
Answeringour last check, 2026-10-18
1 of 1checks answered this week
25 msmedian answer time
$0.0015listed price per call
$0.0015price 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://api.ishob.com/v1/crypto/simulate-tx
| Category | Market data |
|---|---|
| Provider host | api.ishob.com |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 2 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-10-18 | valid payment request | 402 | $0.0015 | 25 ms |
Example input (from the provider)
{
"body": {
"chain": "ethereum",
"data": "0xa9059cbb000000000000000000000000906f87f107b4675dd890b3f8eb2d51885e50e09d00000000000000000000000000000000000000000000000000000000000f4240",
"from": "0x28c6c06298d514db089934071355e5743bf21d60",
"to": "0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48",
"value": "0"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"properties": {
"chain": {
"enum": [
"ethereum",
"base",
"arbitrum",
"optimism",
"polygon",
"bsc",
"solana"
],
"type": "string"
},
"data": {
"description": "EVM: calldata hex (default 0x)",
"type": "string"
},
"from": {
"description": "EVM: sender address",
"type": "string"
},
"gas": {
"description": "EVM: optional gas limit",
"type": "string"
},
"to": {
"description": "EVM: target address",
"type": "string"
},
"transaction": {
"description": "Solana: base64-encoded transaction (legacy or v0; signatures not required)",
"type": "string"
},
"value": {
"description": "EVM: value in wei (decimal or 0x hex)",
"type": "string"
}
},
"required": [
"chain"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}