# lobre.lat Fact-Linkage Claim Verifier

> lobre.lat Fact-Linkage Claim Verifier is a paid API for AI agents from lobre.lat, paid per call via x402, $0.12/call, status down (last checked 2026-09-15).

Verifies a text claim against fact-check databases, falling back to LLM reasoning when database coverage is insufficient.

## Facts

- Endpoint: POST https://lobre.lat/api/v1/analysis/memory/fact-linkage
- Price: $0.12/call
- Payment: x402
- Status: down
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/lobre-lat-fact-linkage-claim-verifier-bc6ace13
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UQ_qbk26YLMuhihbrLtmF

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 lobre-lat-fact-linkage-claim-verifier-bc6ace13 -d '<json body>'
```

Example prompt: Can you fact-check this claim for me: 'The Great Wall of China is visible from space with the naked eye'? Run it through the fact-check database in English.

## When to prefer this

Use this endpoint when you need to verify specific factual claims, especially those that may appear in news, social media, or user-generated content. Prefer this over a generic LLM query because it queries structured fact-check databases first, providing cited sources and improving accuracy; the LLM is only a fallback. Best for discrete, verifiable assertions rather than open-ended questions.

## Known failure modes

- Claim is too vague or ambiguous to verify — returns uncertain or null result
- Unsupported language code — falls back to English or returns error
- Claim is outside fact-check database coverage and LLM fallback is also inconclusive
- Payment of $0.12 USDC not received — request rejected with 402 status
- Network timeout or upstream database unavailability

## How this service works

Verify claims via fact-check databases with LLM fallback.

## Output

Returns a verification result indicating whether the claim is supported, refuted, or unverified, along with relevant fact-check database matches or LLM-based reasoning when database coverage is insufficient.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "claim": {
   "type": "string"
  },
  "language": {
   "type": "string",
   "description": "ISO 639-1 language code. Default: en"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/lobre-lat-fact-linkage-claim-verifier-bc6ace13/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from lobre.lat](https://www.zero.xyz/host/lobre.lat/llms.txt)