# ProspectIntel Claim Grounding Verifier

> ProspectIntel Claim Grounding Verifier 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 2026-09-18).

Verifies whether a specific claim is grounded in evidence by checking it against supporting sources or context

## Facts

- Endpoint: POST https://claim-grounding.prospectintel.workers.dev/v1/verify_claim
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/prospectintel-claim-grounding-verifier-1598316b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_6j1TtXGsNsKyecsfbEVBu

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-verifier-1598316b -d '<json body>'
```

Example prompt: Can you check whether the claim 'the average global temperature has risen by 1.1°C since pre-industrial times' is grounded in verifiable evidence?

## When to prefer this

Choose this endpoint when you need a fast, per-claim grounding gate — particularly for validating individual assertions produced by LLMs, RAG pipelines, or AI agents before presenting them to users. It is well-suited for hallucination detection, sales intelligence validation, and research workflows where a binary or scored grounded/ungrounded signal is needed quickly at $0.10 per check.

## Known failure modes

- Missing required claim or body fields returns a validation error
- Ambiguous or overly vague claims may return low-confidence results
- Claims requiring real-time data may not be groundable if no live source is provided
- Payment failure or x402 authentication issues prevent execution
- Malformed JSON body causes a 400-level error

## How this service works

Fast claim grounding gate

## Output

Returns a grounding verdict for the submitted claim, indicating whether it is supported by evidence, along with confidence signals and any relevant grounding details such as supporting or contradicting evidence fragments.

## 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-verifier-1598316b/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)