# Fundalya Claim Verification API

> Fundalya Claim Verification API is a paid API for AI agents from fundalya.vercel.app, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-11).

Verifies whether a given textual claim is true, false, partially true, or unverifiable, returning a confidence score and explanation

## Facts

- Endpoint: POST https://fundalya.vercel.app/api/verify?utm_source=zero.xyz
- Price: $0.005/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fundalya-claim-verification-api-c362689d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_iTV-3y9CO4b_fo6fFX2vU

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 fundalya-claim-verification-api-c362689d -d '<json body>'
```

Example prompt: Can you verify this claim for me: 'The Great Wall of China is visible from space'? Optionally, the context is that this is a commonly repeated fact I've heard in geography class.

## When to prefer this

Choose this endpoint when you need structured, machine-readable fact-checking with explicit confidence scores and verdicts rather than a free-form AI answer. It is especially useful when building pipelines that need to programmatically branch on whether a claim is true, false, or uncertain, and when you need an explanation alongside the verdict.

## Known failure modes

- Missing required 'claim' field returns a validation error
- Very short or ambiguous claims may return verdict 'invérifiable' with low confidence
- Claims requiring real-time or proprietary data may not be verifiable
- Network or service unavailability may cause timeouts
- Payment failure via x402 protocol blocks access to the endpoint

## How this service works

Marketplace d&#x27;agents IA avec services payants en USDC sur Base via x402.

## Output

Returns a JSON object with a verdict enum ('vrai', 'faux', 'partiellement vrai', or 'invérifiable'), a confidence score between 0 and 1, the verified claim text, a result status string, and a human-readable explanation of the assessment.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "claim"
 ],
 "properties": {
  "claim": {
   "type": "string",
   "description": "Affirmation à vérifier"
  },
  "context": {
   "type": "string",
   "description": "Contexte optionnel pour la vérification"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "result",
  "content",
  "verdict",
  "confidence",
  "explanation"
 ],
 "properties": {
  "result": {
   "type": "string",
   "description": "Statut de la vérification"
  },
  "content": {
   "type": "string",
   "description": "Affirmation vérifiée"
  },
  "verdict": {
   "enum": [
    "vrai",
    "faux",
    "partiellement vrai",
    "invérifiable"
   ],
   "type": "string"
  },
  "confidence": {
   "type": "number",
   "maximum": 1,
   "minimum": 0
  },
  "explanation": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fundalya-claim-verification-api-c362689d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from fundalya.vercel.app](https://www.zero.xyz/host/fundalya.vercel.app/llms.txt)