Pre-sign EVM transaction simulation
Pre-sign EVM transaction simulation: an eth_call with state overrides previewing the revert reason and asset deltas before you sign. POST /v1/chain with the call {to, data, ...} and get the outcome as one JSON object. Deterministic per state instant. Pay per request in USDC; no account, no API key.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
957 msmedian answer time
$0.005listed price per call
$0.005price 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://agent.pocket.network/v1/chain-simulation
| Category | Everything else |
|---|---|
| Provider host | agent.pocket.network |
| Networks | eip155:8453 |
| Payment schemes | exact |
| Self-reported calls, 30 days | 5 from 2 payers (the provider's figure, not ours) |
Our checks, last 30 days
| Day | Result | HTTP | Asked | Time |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 957 ms |
Example input (from the provider)
{
"body": {
"data": "0x",
"to": "0xdAC17F958D2ee523a2206206994597C13D831ec7"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"description": "The call to simulate before signing.",
"properties": {
"chain_id": {
"description": "EVM chain id (default 1).",
"type": "integer"
},
"data": {
"description": "Calldata, 0x-prefixed (0x for none).",
"type": "string"
},
"from": {
"description": "Optional sender address.",
"type": "string"
},
"to": {
"description": "Target contract address, 0x-prefixed.",
"type": "string"
}
},
"required": [
"to"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"data": {
"description": "For POST /v1/chain, a JSON object with the simulated outcome: success or revert reason, asset deltas, and the chain_id. The exact shape is the service's own and is not pinned here; errors return a JSON object with an `error` field, and the GET routes return their own small JSON documents.",
"type": "object"
},
"portal": {
"properties": {
"provenance": {
"const": "third-party-supplier"
},
"schemaCheck": {
"enum": [
"passed",
"undeclared",
"unchecked"
]
},
"serviceId": {
"const": "chain-simulation"
}
},
"required": [
"provenance",
"serviceId",
"schemaCheck"
],
"type": "object"
}
},
"required": [
"portal",
"data"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}