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SignalHarness ABI Interface Compare
x402
SignalHarness ABI Interface Compare 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).
Compares two or more smart contract ABI interfaces to identify differences, incompatibilities, or breaking changes.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a structured comparison of the two ABI interfaces, including an 'abi_interface_comparison' narrative result, a list of 'warnings' about incompatibilities or breaking changes, the 'service_id', and an 'evidence_scope' field indicating how the analysis was grounded. Also includes a full receipt with payment and execution metadata.
Example use cases
Pre-upgrade ABI compatibility check
“I'm about to upgrade my smart contract proxy — can you compare the old ABI with the new one and flag any breaking changes that would break existing callers?”
ERC standard compliance check
“Check whether this custom token contract's ABI is compatible with the standard ERC-20 interface — I need to know if anything is missing or has a different signature.”
Cross-version interface audit
“I have two versions of our DeFi protocol's vault contract ABI — can you diff them and list all the functions that were removed, added, or had their signatures changed?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/abi_interface_compare/invokeWhen to prefer
Use this endpoint when you need a structured, automated comparison of two smart contract ABIs to detect breaking changes, missing functions, or signature mismatches — particularly before contract upgrades, when auditing protocol changes, or when verifying that an implementation matches a standard interface like ERC-20 or ERC-721.
Side effects
- Malformed or non-JSON ABI input causes parsing failure
- Input exceeds 65536 character limit
- Ambiguous or incomplete ABI definitions yield low-confidence or incomplete comparison
- Invalid ABI format (non-standard structure) may result in warnings or partial analysis
- Network or payment settlement failure returns error status
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| abi_interface_compare_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Interface similarity does not prove implementation compatibility."
],
"service_id": "abi_interface_compare",
"evidence_scope": "caller_supplied_data",
"abi_interface_comparison": "{\"equal\":true,\"only_left\":[],\"only_right\":[],\"shared\":[\"error:Insufficient(uint256)\",\"event:Changed(address,uint256)\",\"function:balanceOf(address)\"]}"
},
"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": "abi_interface_compare",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "5f2e0958d8952252e24956abbb96ac159fc814b87a33b2cf50215adf083a87f3",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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