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SignalHarness Structured Diff
x402
SignalHarness Structured Diff is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).
Computes a structured semantic diff between two arbitrary JSON values, returning added, changed, and removed fields with a summary.
Price / call$0.01
Success—
StatusUnknown
How this service works
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Output
Returns a structured diff object with three arrays — added, changed, and removed — listing affected fields and their values, plus a summary object with counts for each category and an unchanged count. Also includes execution metadata such as payment receipt, request ID, and a SHA-256 hash of the result for verification.
Example use cases
Audit API response drift
“I got two different responses from an API endpoint — can you compare these two JSON payloads and tell me exactly which fields changed, which were added, and which disappeared?”
Track config file changes
“Here are two versions of our app config — the one from last week and today's. Can you show me a structured breakdown of what was added, removed, or modified between them?”
Detect data pipeline mutations
“I have a record before it went through our transformation pipeline and the output afterward. Can you run a structured diff and summarize how many fields were added, changed, or removed?”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/structured_diff/invokeWhen to prefer
Choose this endpoint when you need a deterministic, structured breakdown of differences between two arbitrary JSON values — objects, arrays, or primitives — especially when you need machine-readable output (added/changed/removed arrays) rather than a human-readable text diff. Prefer it over generic LLM-based comparison when you need reliable counts, field-level granularity, and a verifiable result hash. Best for auditing, change detection pipelines, and automated monitoring scenarios.
Side effects
- Malformed or unparseable JSON in before/after fields returns an error
- Both inputs being identical returns empty diff arrays with zero counts
- Missing required before or after fields may result in a 400 error
- Network timeout or service unavailability returns a failure status
- Payment failure via x402 protocol prevents execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| after | — | |
| before | — |
Output
Schema · Response
{
"type": "json",
"example": {
"replay": false,
"result": {
"added": [
{
"path": "example",
"value": {}
}
],
"changed": [
{
"path": "example",
"after": {},
"before": {}
}
],
"removed": [
{
"path": "example",
"value": {}
}
],
"summary": {
"added": 0,
"total": 0,
"changed": 0,
"removed": 0
},
"unchangedCount": 0
},
"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": "structured_diff",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "10000",
"resultSha256": "eef31d0cecdd1ad7e4ac279ba4b65b39356fb5a7ebc208786b5441e79bdf9c88",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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