# ProspectIntel Claim Grounding Gate

> ProspectIntel Claim Grounding Gate is a paid API for AI agents from claim-grounding.prospectintel.workers.dev, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-19).

Validates whether an AI-generated answer is grounded in and supported by the provided source material or context

## Facts

- Endpoint: POST https://claim-grounding.prospectintel.workers.dev/v1/check_answer
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prospectintel-claim-grounding-gate-de549473
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zKrismV_VkzMCl5hlPuqt

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 prospectintel-claim-grounding-gate-de549473 -d '<json body>'
```

Example prompt: Before you show the user this answer, check if it's actually grounded in the source document I retrieved — run it through the grounding gate and tell me if the response is supported or if it's hallucinating.

## When to prefer this

Choose this endpoint when you need a fast, cheap ($0.10/call) automated gate to catch hallucinations or ungrounded claims in AI-generated answers before delivery, especially in RAG pipelines or agentic workflows where answer accuracy is critical. Prefer this over full LLM re-evaluation when you want a lightweight, purpose-built grounding check rather than a general-purpose model review.

## Known failure modes

- Missing or malformed body payload returns an error
- Empty or missing source context may produce unreliable verdicts
- Very long inputs may hit token or size limits
- Ambiguous or vague claims may return low-confidence verdicts
- Network timeout on the Cloudflare Worker edge runtime

## How this service works

Fast answer grounding gate

## Output

Returns a verdict indicating whether the provided answer or claim is grounded in the supplied source material, likely including a pass/fail grounding result and potentially a confidence score or explanation of which parts are or are not supported.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "const": "http"
    },
    "method": {
     "enum": [
      "POST"
     ],
     "type": "string"
    },
    "bodyType": {
     "const": "json"
    }
   }
  },
  "output": {
   "type": "object"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/prospectintel-claim-grounding-gate-de549473/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from claim-grounding.prospectintel.workers.dev](https://www.zero.xyz/host/claim-grounding.prospectintel.workers.dev/llms.txt)