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SignalHarness Model Output Regression Compare
x402
SignalHarness Model Output Regression Compare is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.025/call, status unknown (last checked 2026-09-15).
Compares model outputs to detect regressions or differences between versions using caller-supplied data
Price / call$0.025
Success—
StatusUnknown
How this service works
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Output
Returns a JSON analysis result containing a comparison of model outputs, any detected regressions or anomalies, warnings about data reliability (since inputs are caller-supplied), an evidence scope label, and a signed receipt with payment details, request/execution IDs, result SHA256 hash, and service metadata for auditability.
Example use cases
Post-fine-tune regression check
“I just fine-tuned my language model and I want to check if its outputs have regressed compared to the original — here's a JSON with 50 paired outputs from the baseline and the new version, can you run a regression comparison?”
A/B model deployment validation
“Before I swap my production model to the new version, can you compare these two sets of predictions side-by-side and flag any quality regressions? I'll paste the JSON with both models' outputs.”
Scheduled model monitoring alert
“I'm getting alerts that my recommendation model might be drifting — can you analyze this JSON of recent outputs against my saved baseline to identify any regression patterns?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/model_output_regression_compare/invokeWhen to prefer
Choose this endpoint when you need a pay-per-call, agent-native regression comparison for AI model outputs — particularly when you want an auditable receipt on Base blockchain and are operating in an x402 micropayment environment. Prefer it over custom scripts when you need on-demand, stateless model output comparison without standing up MLOps infrastructure, and when cost-per-call billing ($0.025 USDC) is preferable to subscription pricing.
Side effects
- Invalid or malformed request_json payload returns validation error
- request_json exceeding 65536 characters is rejected
- Empty or too-short input (below 2 chars) is rejected
- Caller-supplied data that doesn't match expected comparison schema may yield unreliable analysis with warnings
- Payment failure on x402 protocol results in 402 response before execution
- Network errors on Base chain may delay receipt settlement
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": "model_output_regression_compare",
"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": "model_output_regression_compare",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "25000",
"resultSha256": "61a816840107ad35a33c2014e6edfdef89b25d8dfb5d98573376bf5e8c0cbb36",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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