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SignalHarness Agent Execution Diff
x402
SignalHarness Agent Execution Diff 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).
Analyzes and diffs agent execution data provided as JSON, returning structured analysis with warnings and evidence scope metadata.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a JSON object containing: a status field ('succeeded' or error), an analysis_json string with structured diff/analysis results, a list of warnings (e.g. data provenance notices), an evidence_scope label indicating data origin (e.g. 'caller_supplied_data'), and a receipt with payment metadata including paymentId, requestId, executionId, latency, and a resultSha256 hash for integrity verification.
Example use cases
Auditing diverging agent run outputs
“I have two JSON blobs from separate agent executions that should have produced the same result but didn't — can you diff them and tell me what's different and whether there are any warnings I should know about?”
Validating agent behavior after a model update
“After swapping out the underlying model in our agent pipeline, I need to verify the execution outputs look structurally the same — can you analyze this execution JSON and flag any anomalies or changes compared to the baseline?”
Debugging unexpected agent workflow steps
“Our agent took an extra step it shouldn't have on this run — here's the execution JSON, can you analyze it and tell me what the diff looks like and if there are any warnings flagged?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/agent_execution_diff/invokeWhen to prefer
Choose this endpoint when you need lightweight, pay-per-call agent execution diffing without standing up your own comparison infrastructure. It is particularly useful when you want a structured analysis of JSON-formatted agent execution data with evidence-scoped warnings, and when you are already operating in a Base USDC x402 payment context. Prefer alternatives if you need real-time streaming diffs, multi-file comparisons, or deep semantic code analysis beyond JSON data.
Side effects
- Malformed or non-JSON request_json input returns a validation error
- Payload exceeding 65536 character limit is rejected
- Caller-supplied data that cannot be parsed as valid JSON results in analysis failure
- Payment not received or insufficient USDC balance causes 402 response
- Network or settlement issues on Base may cause receipt status anomalies
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| request_json | string |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"warnings": [
"Verify the caller-supplied data before relying on this result."
],
"service_id": "agent_execution_diff",
"analysis_json": "{\"example\":\"schema-valid caller-supplied data\"}",
"evidence_scope": "caller_supplied_data"
},
"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": "agent_execution_diff",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "8c6e115df223dba1d771a4aab84acdd9bb7d15c557ce60301683da91c5e78f8c",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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