# SignalHarness LLM Response Claim Extractor

> SignalHarness LLM Response Claim Extractor 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).

Extracts and structures factual claims from LLM-generated text responses, returning a validated analysis JSON with warnings about caller-supplied data.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/llm_response_claim_extract/invoke
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-llm-response-claim-extractor-8722f20a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_HTYcmpLXwBthxa_FCXq6V

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability signalharness-llm-response-claim-extractor-8722f20a -d '<json body>'
```

Example prompt: Extract all factual claims from this LLM response so I can verify them: '{"response": "The Eiffel Tower was built in 1889 and stands 330 meters tall. It receives 7 million visitors annually."}'

## When to prefer this

Choose this endpoint when you need to programmatically decompose LLM or chatbot outputs into discrete, structured factual claims — especially in fact-checking pipelines, RAG audit workflows, or AI output quality monitoring. It is well-suited for agents that need to isolate verifiable assertions from free-form generated text before passing them to a verification or grounding step. Prefer it over general-purpose text parsers when you specifically need claim-level granularity with a structured JSON result and a cryptographic receipt for auditability.

## Known failure modes

- Malformed or non-JSON request_json input returns a parsing error
- Input text exceeding 65,536 characters is rejected
- LLM responses with ambiguous or no extractable claims may return an empty or minimal analysis
- Network or payment settlement failures may result in no result with a failed status receipt
- Caller-supplied data that is itself invalid JSON may cause unexpected extraction behavior

## How this service works

Explore 330 pay-per-call x402 API services and 27 agent-native digital products, with Base USDC pricing, secure Polar checkout, and free discovery.

## Output

Returns a JSON object containing an analysis_json field with structured extracted claims, an evidence_scope field indicating the data came from caller-supplied input, and a warnings array reminding the caller to verify the data. Also includes a full execution receipt with payment details, latency, and a SHA-256 hash of the result for audit purposes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "request_json": {
   "type": "string",
   "maxLength": 65536,
   "minLength": 2
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "replay": false,
  "result": {
   "warnings": [
    "Verify the caller-supplied data before relying on this result."
   ],
   "service_id": "llm_response_claim_extract",
   "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": "llm_response_claim_extract",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "5000",
   "resultSha256": "c5d55edd84af5f133e7085a4d5f7494aba00a7817cdfd8bf629392ad09160f01",
   "serviceVersion": "1.0.0",
   "settlementReference": "0x0000000000000000000000000000000000000000000000000000000000000000"
  },
  "artifacts": [],
  "requestId": "example-request",
  "executionId": "example-execution"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/signalharness-llm-response-claim-extractor-8722f20a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from signalharness.ai](https://www.zero.xyz/host/signalharness.ai/llms.txt)