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SignalHarness ABI Custom Error Decoder
x402
SignalHarness ABI Custom Error Decoder 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).
Decodes a custom Solidity ABI error from raw revert data into a human-readable form, given caller-supplied ABI and error payload
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object with a decoded_custom_error string (human-readable error name and arguments), optional warnings array, service_id, evidence_scope indicating the data came from caller-supplied input, and a full payment receipt including network, asset, amounts, latency, and execution identifiers.
Example use cases
Debugging failed DeFi transaction
“My DeFi transaction on Base just reverted with a custom error. Here's the raw revert data and the contract ABI — can you decode what the custom error actually says so I know what went wrong?”
Smart contract testing error analysis
“During my Hardhat test suite a contract call threw a custom error. I have the ABI and the encoded error bytes — decode it for me so I can figure out which error condition was triggered.”
On-chain error monitoring pipeline
“I'm building an alert system and I need to decode this ABI custom error from a failed Base transaction — here's the ABI error definition and the raw hex payload, please decode it and tell me what the error fields contain.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/abi_custom_error_decode/invokeWhen to prefer
Choose this endpoint when you need to programmatically decode Solidity custom errors from raw ABI-encoded revert data on EVM-compatible chains, especially on Base. It is purpose-built for agent workflows that encounter contract reverts and need machine-readable decoded error output with a verifiable receipt. Prefer it over generic ABI libraries when you need a paid, auditable, receipt-backed decode as part of an on-chain agent pipeline.
Side effects
- Malformed or invalid ABI definition causes decode failure
- Error selector in data does not match any entry in the supplied ABI
- Input string exceeds 65536 character limit
- Truncated or corrupted hex revert data produces ambiguous decode
- Missing required abi_error_decode_request field returns validation error
- Payment failure or insufficient USDC balance prevents execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| abi_error_decode_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Decoded revert data does not prove transaction execution."
],
"service_id": "abi_custom_error_decode",
"evidence_scope": "caller_supplied_data",
"decoded_custom_error": "{\"abiItem\":{\"inputs\":[{\"name\":\"available\",\"type\":\"uint256\"}],\"name\":\"Insufficient\",\"type\":\"error\"},\"args\":[\"5\"],\"errorName\":\"Insufficient\"}"
},
"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_custom_error_decode",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "4beeae711d524731f74ce28b2ba6eb1cc6582faab0517b7748b025bebcc57737",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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