Return bounded factual eth_estimateGas units and recent eth_feeHistory execution
Return bounded factual eth_estimateGas units and recent eth_feeHistory execution-fee evidence for one unsigned Ethereum or Base transaction. Not execution, signing, custody, trading, or a guaranteed final cost. Call when you need point-in-time gas units and recent execution-fee context before signing or submitting.
Answeringour last check, 2026-09-24
1 of 1checks answered this week
232 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://api.agentmercantile.com/v1/transaction-gas-preflight
| Category | Code and developer |
|---|---|
| Provider host | api.agentmercantile.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 |
|---|---|---|---|---|
| 2026-09-24 | valid payment request | 402 | $0.005 | 232 ms |
Example input (from the provider)
{
"body": {
"chain": "eip155:8453",
"data": "0x",
"to": "0x0000000000000000000000000000000000000001",
"value_wei": "0"
},
"bodyType": "json",
"method": "POST",
"type": "http"
}
Promised output schema (from the provider)
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"chain": {
"description": "Analysis chain only. Payment remains Base eip155:8453.",
"enum": [
"eip155:1",
"eip155:8453"
],
"type": "string"
},
"data": {
"description": "Optional 0x-prefixed even-length hex calldata. Default 0x. Maximum 8192 bytes. Request body maximum 20480 bytes.",
"maxLength": 16386,
"pattern": "^0x(?:[0-9a-fA-F]{2})*$",
"type": "string"
},
"from": {
"description": "Optional 0x-prefixed 20-byte sender used only as an eth_estimateGas field. No ownership is implied.",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"to": {
"description": "Required 0x-prefixed 20-byte destination. Contract creation is not supported.",
"pattern": "^0x[0-9a-fA-F]{40}$",
"type": "string"
},
"value_wei": {
"description": "Optional unsigned base-10 integer string in the uint256 range. Default 0. JSON Schema cannot express the full uint256 upper bound; runtime validation rejects values above 2^256-1.",
"pattern": "^(0|[1-9][0-9]*)$",
"type": "string"
}
},
"required": [
"chain",
"to"
],
"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": {
"additionalProperties": true,
"properties": {
"chain": {
"type": "object"
},
"fee_history": {
"description": "Recent eth_feeHistory execution-fee evidence.",
"type": [
"object",
"null"
]
},
"gas_estimate": {
"description": "eth_estimateGas units when estimable.",
"type": [
"object",
"null"
]
},
"illustrative_execution_fees": {
"description": "Illustrative L2 execution-fee observations, not a guaranteed final cost.",
"type": [
"object",
"null"
]
},
"limitations": {
"items": {
"type": "string"
},
"type": "array"
},
"machine": {
"enum": [
"VM06"
],
"type": "string"
},
"methodology_version": {
"enum": [
"transaction-gas-preflight-0.1.0"
],
"type": "string"
},
"request_shape": {
"type": "object"
},
"status": {
"enum": [
"OK",
"PARTIAL",
"UNESTIMABLE",
"HOLD"
],
"type": "string"
}
},
"required": [
"status",
"machine",
"methodology_version",
"chain",
"gas_estimate",
"limitations"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}