# SignalHarness RAG Answer Evidence Map

> SignalHarness RAG Answer Evidence Map is a paid API for AI agents from signalharness.ai, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Runs a retrieval-augmented generation (RAG) pipeline over caller-supplied data to produce an answer with an evidence map tracing claims back to source passages.

## Facts

- Endpoint: POST https://signalharness.ai/api/agent/services/rag_answer_evidence_map/invoke
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/signalharness-rag-answer-evidence-map-6ccb73bf
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_M6hltvm_jSOYlxn_08pSc

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-rag-answer-evidence-map-6ccb73bf -d '<json body>'
```

Example prompt: Take this JSON blob of research notes and answer the question 'What are the key risk factors?' — then give me an evidence map showing which passages from my notes support each part of the answer.

## When to prefer this

Choose this endpoint when you have your own document corpus or context data (as JSON) and need answers that are grounded and traceable back to specific evidence passages — especially when auditability, citation, or claim verification matters. Prefer this over a generic LLM call when you need provenance, or over a web-search RAG when your authoritative data is private and caller-supplied.

## Known failure modes

- Malformed or non-JSON request_json causes validation failure
- request_json exceeds 65536 character limit returning a size error
- Caller-supplied data is too sparse to produce a meaningful evidence map, yielding empty or low-confidence output
- Payment not settled results in 402 response before execution
- Ambiguous query produces warnings about data reliability

## 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 the structured answer, an evidence_scope field identifying the data source as caller-supplied, any relevant warnings (e.g. to verify caller-supplied data), and a signed receipt with payment details, latency, SHA256 result hash, and execution metadata.

## 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": "rag_answer_evidence_map",
   "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": "rag_answer_evidence_map",
   "executionId": "example-execution",
   "startedAtMs": 0,
   "amountAtomic": "10000",
   "resultSha256": "f88c9573b4375d077bed71492a2ebc98038a7bce1f05ca8e7d0ee62e7f26903e",
   "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-rag-answer-evidence-map-6ccb73bf/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)