# SignalHarness EVM Fee Breakdown

> 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.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/evm_fee_breakdown/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-13
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-evm-fee-breakdown-b17ce6c0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M7u1ESOzLZsFHgHREPanU

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signalharness-evm-fee-breakdown-b17ce6c0 -d '<json body>'
```

Example prompt: Can you break down the fee components for this EVM transaction — I want to understand exactly what I'm paying in base fee, priority fee, and any other gas costs: {paste raw transaction or fee request data here}.

## When to prefer this

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.

## Known failure modes

- 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

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## 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.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "evm_fee_request": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "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"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signalharness-evm-fee-breakdown-b17ce6c0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)