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SignalHarness CrossChain Fee Comparator
x402
SignalHarness CrossChain Fee Comparator is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-13).
Compares transaction fees across multiple blockchain networks (Base, Solana, Polygon) for a given set of on-chain operations using caller-supplied data.
Price / call$0.015
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis object containing a comparison policy, a list of fees per chain with amounts and units, the set of analyzed networks (e.g. solana_base_polygon), an evidence scope label (caller_supplied_data), and any warnings about cross-asset ranking or missing conversion values. Also includes a receipt with payment and execution metadata.
Example use cases
Cheapest chain for DeFi swap
“I want to execute a token swap and I have the fee quotes from Base, Solana, and Polygon — can you compare those fees and tell me which network gives the lowest cost? Here are the amounts: Base 2205000 wei, Polygon 3100000 wei.”
Cross-chain bridge cost analysis
“I'm considering bridging USDC across three chains. Can you run a fee comparison across Base, Solana, and Polygon using these fee data points I've gathered, and rank them from cheapest to most expensive?”
Agent treasury routing optimization
“My agent needs to decide which chain to settle payments on. Compare the transaction fee data I'm supplying for Base, Solana, and Polygon and return a ranked analysis so I can route to the cheapest option.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/crosschain_fee_compare/invokeWhen to prefer
Use this endpoint when you have fee data from multiple blockchains (especially Base, Solana, and Polygon) and need a structured, policy-driven comparison to determine the lowest-cost chain for a transaction. Prefer it over manual comparisons or single-chain fee estimators when operating cross-chain and needing an auditable, machine-readable ranking with an evidence scope. Ideal for AI agents making autonomous routing decisions about which chain to settle on.
Side effects
- Missing or malformed request_json causes immediate validation failure
- Cross-asset fee ranking without supplied conversion values triggers a warning and may produce incomplete results
- Unsupported or unrecognized chain identifiers may be silently excluded from analysis
- Stale or missing timestamps on fee data produce unreliable comparisons
- Payment failure (insufficient USDC balance) results in 402 response and no analysis
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Cross-asset ranking requires supplied conversion values and timestamps."
],
"service_id": "crosschain_fee_compare",
"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_fee_compare",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "15000",
"resultSha256": "77b4bdd5eace6f77d9b15b745949c3cfca46fe6a2637f50590d2abd6774e231d",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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