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SignalHarness Agent Tool Result Validator
x402
SignalHarness Agent Tool Result Validator is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Validates and analyzes the JSON result returned by an agent tool call, returning warnings and structured analysis with a cryptographic receipt.
Price / call$0.005
Success—
StatusUnknown
How this service works
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Output
Returns a validation status ('succeeded'), an analysis_json string with structured findings, a list of warnings about the caller-supplied data, a SHA-256 hash of the result for integrity verification, and a full execution receipt including payment ID, network, asset address, latency, and settlement reference on Base (EIP-155:8453).
Example use cases
Validate agent tool output before downstream use
“I just got a JSON result back from one of my agent tools and I need to know if it's valid and safe to pass to the next step — can you validate this: '{"action":"search","results":[{"title":"Article","url":"https://example.com"}]}'?”
Audit tool call results with tamper-proof receipt
“My AI pipeline ran a tool call and returned some JSON — validate the result and give me a cryptographic receipt I can store as proof it was checked: the result JSON is '{"order_id":"12345","status":"fulfilled","amount":99.99}'.”
Detect warnings in malformed tool response
“Something looks off about the JSON my agent tool returned — can you run it through validation and flag any warnings? Here's the result: '{"error":null,"payload":null,"meta":{}}'.”
Technical details
Endpoint
POSThttps://signalharness.ai/api/agent/services/agent_tool_result_validate/invokeWhen to prefer
Choose this endpoint when your agent pipeline needs to validate, audit, or verify the integrity of a tool call result JSON before using it downstream, especially when a tamper-proof blockchain receipt (on Base via x402/USDC) is required as proof of validation. Prefer this over manual JSON schema checks when you need a structured analysis with warnings and a cryptographic audit trail rather than just a boolean pass/fail.
Side effects
- Malformed or non-JSON request_json string causes validation error
- Input exceeds 65536 character limit returns rejection
- Payment not confirmed results in 402 response before execution
- Caller-supplied data warnings always present — result is not independently sourced
- Network issues on Base blockchain may delay receipt finalization
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_tool_result_validate",
"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_tool_result_validate",
"executionId": "example-execution",
"startedAtMs": 0,
"amountAtomic": "5000",
"resultSha256": "743544cd40f8e0d218086f4273e573721eb1683fd3a680cff3880523d37ff29b",
"serviceVersion": "1.0.0",
"settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
},
"artifacts": [],
"requestId": "example-request",
"executionId": "example-execution"
}
}Tags
x402
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