# LLM Response Citation Coverage Analyzer

> LLM Response Citation Coverage Analyzer is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Analyzes an LLM-generated response to measure how well its claims are supported by citations or referenced sources.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/llm_response_citation_coverage/invoke
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/llm-response-citation-coverage-analyzer-4420f9c2
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_QIdPfKQ4yCKWOxMUKmwPo

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 llm-response-citation-coverage-analyzer-4420f9c2 -d '<json body>'
```

Example prompt: Check this LLM response JSON for citation coverage — I want to know how many of the claims are actually backed by cited sources and which ones are unsupported.

## When to prefer this

Choose this endpoint when you need a lightweight, pay-per-call check on whether an LLM-generated response adequately cites its sources — especially in RAG pipelines, AI content workflows, or agent quality-assurance loops where hallucination and grounding are concerns. Prefer this over manual review when you need automated, programmatic citation coverage scoring at $0.015 per call via x402/USDC micropayment.

## Known failure modes

- Malformed or non-JSON request_json input causes validation error
- request_json exceeds 65,536 character limit returns rejection
- Empty or trivially short input (fewer than 2 characters) is rejected
- LLM response contains no citations at all, yielding zero-coverage result with warnings
- Caller-supplied data flagged as unverifiable, triggering caller_supplied_data warning in result

## 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 a citation coverage analysis of the submitted LLM response, including a coverage breakdown, any warnings about unverified or unsupported claims, an evidence scope label indicating the data came from the caller, and a status field. The result is wrapped in a signed receipt with payment confirmation on Base USDC.

## 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_citation_coverage",
   "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_citation_coverage",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "15000",
   "resultSha256": "b5015898b24d0a54e906d8efaf74affd12af3e5bbb3fa76810dc45f9b1d5ba56",
   "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/llm-response-citation-coverage-analyzer-4420f9c2/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)