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CrossChain Transaction Cost Report
x402
CrossChain Transaction Cost Report is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.02/call, status unknown (last checked 2026-09-13).
Analyzes and compares cross-chain transaction fees across multiple blockchain networks (Solana, Base, Polygon) from caller-supplied transaction data.
Price / call$0.02
Success—
StatusUnknown
How this service works
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Output
Returns a structured analysis containing a fee breakdown per chain (amount, chain, unit), the list of analyzed networks, evidence scope (caller_supplied_data), comparison policy used, and any warnings such as missing live fee or exchange rate data. Wrapped in a receipt confirming payment and execution.
Example use cases
DeFi bridge cost comparison
“I have fee data from a token bridge transaction that touched Base and Polygon — can you run a cross-chain cost report and tell me which leg was more expensive, using this transaction JSON I'm pasting in?”
Agent treasury optimization
“My agent just completed swaps on Solana and Base. Here's the transaction data — can you analyze the fees paid on each chain and summarize the total cost breakdown so I can decide which chain to route future transactions through?”
Multi-chain audit report
“I'm auditing our protocol's fee spend last week across Solana, Base, and Polygon. Here's the JSON with all the fee records — can you run a cross-chain transaction cost report and flag any anomalies or warnings?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/crosschain_transaction_cost_report/invokeWhen to prefer
Choose this endpoint when you already have raw cross-chain transaction fee data (e.g. from your own wallet, protocol logs, or bridge receipts) and need a structured cost comparison report across Solana, Base, and Polygon. It is best for offline/static analysis of caller-supplied data rather than live on-chain fee queries. Prefer this over generic gas estimation tools when you need a multi-chain comparison policy applied to your own transaction records at very low cost ($0.02 USDC).
Side effects
- Malformed or empty request_json returns a validation error
- No live fee or exchange rate data available — service only analyzes caller-supplied data, not real-time on-chain queries
- Unsupported network identifiers in the JSON may be ignored or flagged in warnings
- Mismatched token units across chains prevent direct comparison — comparison policy limits to identical units only
- Payment failure via x402 results in 402 response and no execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"No live fees or exchange rates are inferred."
],
"service_id": "crosschain_transaction_cost_report",
"analysis_json": "{\"comparison_policy\":\"compare_only_identical_units_or_caller_supplied_conversions\",\"fees\":[{\"amount\":\"2205000\",\"chain\":\"base\",\"unit\":\"wei\"}]}",
"evidence_scope": "caller_supplied_data",
"analyzed_network": "solana_base_polygon"
},
"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": "crosschain_transaction_cost_report",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "20000",
"resultSha256": "df5e68836c6f137aafe57094143a23ce3c97e080a4addf13ba45f8894937f529",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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