Agent Mercantile
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.
Offering
- Provider
- api.agentmercantile.com
- Method
- POST
- Offering type
- Api Endpoint
- Transport type
- http
- Category
- Blockchain And Crypto
- Delivery
- Not provided
- Pricing model
- Not provided
- x402 version
- 2
Endpoint context
- URL
https://api.agentmercantile.com/v1/transaction-gas-preflight- MIME type
- Not provided
- First seen
- 2026-10-16T01:50:10.647Z
- Last seen
- Tags
- transaction-gas, gas-estimate, fee-history, unsigned-preflight, evm-gas
Payment pricing
x402 payment terms are the authoritative price for calling this endpoint.
- Payment option 1
- 0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
{
"scheme": "exact",
"network": "eip155:8453",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "5000",
"payTo": "0xdb7b2b54f80479826222749a2ea73a8acc306e1e"
}
]Observed health
- Status
- Healthy
- Latest latency
- 102 ms
- Average latency
- 303 ms
- HTTP status
- 200
- Last checked
- Reachability
- 100% over 14 checks
Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.
Input schema
{
"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 schema
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"chain": {
"description": "Analysis chain only. Payment remains Base eip155:8453.",
"enum": [
"eip155:1",
"eip155:8453"
],
"type": "string"
},
"data": {
"description": "Optional 0x-prefixed even-length hex calldata. Default 0x. Maximum 8192 bytes. Request body maximum 20480 bytes.",
"maxLength": 16386,
"pattern": "^0x(?:[0-9a-fA-F]{2})*$",
"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"
}