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SignalHarness EVM Fee Breakdown
x402
SignalHarness EVM Fee Breakdown is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-13).
Analyzes and breaks down gas fee components for EVM transactions, returning a structured fee explanation with warnings and evidence scope.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing a structured fee_breakdown string explaining the EVM fee components, a list of warnings about anomalies or caveats, an evidence_scope field indicating the analysis was performed on caller-supplied data, plus a full receipt with payment details, latency, and a SHA-256 result hash for verification.
Example use cases
Diagnosing high gas costs
“This EVM transaction cost way more in gas than I expected — can you break down exactly what the fee components were and flag anything unusual?”
DeFi protocol fee audit
“I'm building a DeFi app and need to understand the full fee breakdown for this smart contract call so I can optimize gas usage — here's the transaction data.”
User-facing fee explanation
“My user is confused about why their Base network transaction fee was so high — can you analyze this fee request and give me a plain-English breakdown of each component so I can explain it to them?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/evm_fee_breakdown/invokeWhen to prefer
Choose this endpoint when you need a structured, AI-interpreted breakdown of EVM transaction fees — especially when raw gas data is complex or opaque and you need to surface warnings, anomalies, or human-readable explanations. Prefer this over manual gas parsing when working with Base, Ethereum, or other EVM-compatible chains and you want a vetted, receipted analysis with cryptographic result verification.
Side effects
- Invalid or malformed evm_fee_request string returns an error response
- Request string exceeds 65,536 character limit — truncation or rejection
- Insufficient or ambiguous fee data may result in warnings but no detailed breakdown
- Payment failure via x402 protocol prevents execution
- Network or service unavailability returns a non-succeeded status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| evm_fee_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"All fee inputs must be supplied in atomic units."
],
"service_id": "evm_fee_breakdown",
"fee_breakdown": "{\"base_fee_atomic\":\"1680000\",\"gas_used\":\"21000\",\"priority_fee_atomic\":\"420000\",\"total_fee_atomic\":\"2100000\"}",
"evidence_scope": "caller_supplied_data"
},
"status": "succeeded",
"receipt": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"usage": [],
"status": "succeeded",
"network": "eip155:8453",
"artifacts": [],
"endedAtMs": 0,
"latencyMs": 0,
"paymentId": "example-payment",
"receiptId": "example-receipt",
"requestId": "example-request",
"serviceId": "evm_fee_breakdown",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "4471895d0dba5afd5c1118bf78a745c0f97976245b43356fa67dec715ce86964",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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