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SignalHarness ABI Encoding Diagnostician
x402
SignalHarness ABI Encoding Diagnostician is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-16).
Analyzes and diagnoses ABI (Application Binary Interface) encoding issues in smart contract data, returning structured warnings and diagnostic findings.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing an ABI encoding diagnostic string describing the issues found, a list of warnings, the evidence scope (indicating the data was caller-supplied), and the service ID. Also includes a full receipt with payment details, execution metadata, network info, and a result SHA-256 hash for verification.
Example use cases
Debugging failed contract transaction
“My Ethereum transaction keeps reverting and I think it's an ABI encoding problem — here's the raw calldata I'm sending to the ERC-20 contract: '0xa9059cbb0000000000000000000000001234...'. Can you diagnose what's wrong with the encoding?”
Validating agent-generated contract calldata
“My agent just generated this ABI-encoded payload for a Uniswap swap call: '0x38ed1739...'. Before I send it on-chain, can you check if the encoding looks correct and flag any warnings?”
Learning why a Solidity integration fails
“I'm integrating with a third-party contract and my ABI-encoded multicall data keeps being rejected. Here's the encoded bytes: '0x252dba42...'. What encoding issues do you see, and what warnings should I be aware of?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/abi_encoding_diagnose/invokeWhen to prefer
Choose this endpoint when you need to diagnose or debug ABI encoding problems in EVM smart contract calldata, particularly when a transaction is reverting or a contract call is behaving unexpectedly due to parameter encoding issues. It is especially useful for AI agents that auto-generate contract calls and need to self-verify encoded payloads before submission. Prefer this over general-purpose code analyzers when you specifically need ABI-aware diagnostics with structured warnings and evidence scope.
Side effects
- Input string too short (below 2 characters) or too long (above 65536 characters) returns validation error
- Malformed or unparseable ABI data may yield empty diagnostics with no warnings
- Payment failure on x402 protocol results in 402 response before execution
- Network or service timeout returns error status in receipt
- Non-ABI-formatted string may produce low-confidence or generic diagnostic output
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| abi_diagnostic_request | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Diagnostics do not simulate execution or prove contract behavior."
],
"service_id": "abi_encoding_diagnose",
"evidence_scope": "caller_supplied_data",
"abi_encoding_diagnostic": "{\"byte_length\":36,\"decode_valid\":true,\"decoded\":{\"args\":[\"0x0000000000000000000000000000000000000001\"],\"functionName\":\"balanceOf\"},\"has_selector\":true,\"payload_word_aligned\":true,\"selector\":\"0x70a08231\",\"valid_hex\":true}"
},
"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_encoding_diagnose",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "4127435eb6889e1d69936bef322d036863abc83b88c31cabbf116e983594c4e4",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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