# FactCheck by Zero AI – Root Endpoint

> FactCheck by Zero AI – Root Endpoint is a paid API for AI agents from factcheck.withzero.ai, paid per call via MPP, price unknown, status unknown (last checked 2026-09-16).

Returns the landing or index response for the factcheck.withzero.ai API, likely providing service info or entry-point metadata for fact-checking capabilities.

## Facts

- Endpoint: GET https://factcheck.withzero.ai/
- Price: price unknown
- Payment: MPP
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Provider: factcheck.withzero.ai
- Website: https://factcheck.withzero.ai
- Canonical page: https://www.zero.xyz/c/factcheck-withzero-ai-factcheck-by-zero-ai-root-endpoint-bbb62293
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_2cCRqbDL4dgv_SKuQuTz-

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 factcheck-withzero-ai-factcheck-by-zero-ai-root-endpoint-bbb62293
```

Example prompt: Can you fact-check this claim for me: 'The Eiffel Tower is taller than the Empire State Building'? I want to know if it's true or false and why.

## When to prefer this

Use this endpoint when you need to verify claims, check factual accuracy, or detect misinformation using an AI-powered fact-checking service. Prefer this over generic web search when you want a structured true/false/uncertain verdict on a specific claim.

## Known failure modes

- Service unavailable (5xx) if the fact-check backend is down
- Empty or minimal response if the root endpoint is just a health check
- Authentication or payment required error if the paywrap gate is enforced
- Timeout if the AI fact-checking model takes too long
- Unexpected object structure if the API schema changes

## Output

Returns a JSON object from the fact-checking service root — likely an API index, service description, or initial fact-check result object. The exact schema is a generic object, so it may include status info, service metadata, or a direct fact-check response.

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/factcheck-withzero-ai-factcheck-by-zero-ai-root-endpoint-bbb62293/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from factcheck.withzero.ai](https://www.zero.xyz/host/factcheck.withzero.ai/llms.txt)