# Veritas Multi-Source Fact Verification API

> Veritas Multi-Source Fact Verification API is a paid API for AI agents from veritas.orbonomy.xyz, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).

Verifies facts about a given topic by aggregating information from multiple sources and returning a structured summary

## Facts

- Endpoint: POST https://veritas.orbonomy.xyz/api/summary
- Price: $0.05/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/veritas-multi-source-fact-verification-api-59efeb48
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_-hmOwcTfavBQlnTXhVHtb

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 veritas-multi-source-fact-verification-api-59efeb48 -d '<json body>'
```

Example prompt: Can you fact-check the claim that 'the Great Wall of China is visible from space' and give me a verified summary in English?

## When to prefer this

Use this endpoint when you need to fact-check a specific claim or topic against multiple sources and receive a structured verification summary. Prefer this over single-source lookups when accuracy and cross-referencing are critical, or when verifying potentially misleading or contested information.

## Known failure modes

- Missing required 'topic' field returns validation error
- Unknown or ambiguous topic may return empty or low-confidence summary
- Unsupported language code in 'lang' may cause degraded or English-fallback results
- Payment failure (402) if USDC payment not attached
- Network timeout if multiple source lookups are slow
- success: false returned when verification cannot be completed

## How this service works

Multi-source fact verification API

## Output

Returns a JSON object with a success boolean and a summary object containing multi-source fact-verification results about the queried topic, including the aggregated findings from multiple sources.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "topic"
 ],
 "properties": {
  "lang": {
   "type": "string"
  },
  "topic": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "success"
 ],
 "properties": {
  "success": {
   "type": "boolean"
  },
  "summary": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/veritas-multi-source-fact-verification-api-59efeb48/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from veritas.orbonomy.xyz](https://www.zero.xyz/host/veritas.orbonomy.xyz/llms.txt)