# Document Q&A with Verified Supporting Quote

> Document Q&A with Verified Supporting Quote is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.006/call, status unknown (last checked 2026-10-03).

Answers a question based on a provided document and returns a verified supporting quote from that document as evidence

## Facts

- Endpoint: POST https://twin.unykorn.org/ai/answer?utm_source=zero.xyz
- Price: $0.006/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-03
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/document-q-a-with-verified-supporting-quote-d74aeefa
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_kamKyIp53dj_7RywByKWh

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 document-q-a-with-verified-supporting-quote-d74aeefa -d '<json body>'
```

Example prompt: Here's a 10-page terms-of-service document — can you find out whether users are allowed to use the service for commercial purposes, and give me the exact quote from the document that supports the answer?

## When to prefer this

Choose this endpoint when you need not just an answer but a verifiable, grounded citation from a specific document — particularly in legal, compliance, research, or audit contexts where evidence is required. Prefer this over generic LLM Q&A when you need provenance and cannot risk hallucinated answers, and when your source text fits within 24,000 characters.

## Known failure modes

- Question or text exceeds character limits (text >24,000 chars or question >500 chars)
- No relevant passage found in the document to answer the question
- Payment failure or insufficient USDC balance (x402 protocol)
- Ambiguous question that cannot be resolved against the document
- Document language or format not supported by the model

## How this service works

Answer a question from a document, with a verified supporting quote — Genesis402 / UnyKorn Operator Network

## Output

Returns an answer to the submitted question derived from the provided document text, along with a verified verbatim supporting quote pulled directly from the document to substantiate the answer.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "text": {
     "type": "string",
     "description": "required, up to 24,000 chars"
    },
    "question": {
     "type": "string",
     "description": "required, up to 500 chars"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "text-qa",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.006,
   "receipt_id": "g402-<16hex>"
  },
  "sources": [
   {
    "ok": true,
    "name": "<source>"
   }
  ],
  "limitations": "<text>",
  "generated_at": "<iso time>",
  "evidence_hash": "sha256:<64hex>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/document-q-a-with-verified-supporting-quote-d74aeefa/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)