# Flint Network AI Agent Verification

> Flint Network AI Agent Verification is a paid API for AI agents from flint.network, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Verifies an AI agent's authority and integrity before executing a transaction, returning a four-state verdict and a signed verification record

## Facts

- Endpoint: POST https://flint.network/api/x402/verify
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/flint-network-ai-agent-verification-0593cbc5
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XblU9kxvhP-eTVXkF18yl

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 flint-network-ai-agent-verification-0593cbc5 -d '<json body>'
```

Example prompt: Before this payment goes through, run an authority and integrity check on our agent using Flint to get a signed verification record and verdict — I need to confirm it's actually authorized to do this.

## When to prefer this

Use this endpoint when you need to gate a financial or sensitive transaction behind a verified authority check for an AI agent — especially when you need a signed, auditable proof of the check. Prefer this over generic auth checks when the four-state verdict model and signed record are required for compliance or downstream trust decisions.

## Known failure modes

- Invalid or missing agent credentials returns an error verdict
- Agent identity cannot be resolved — returns unknown state
- Malformed request body causes 400-level error
- Signing service unavailable causes verification failure
- Network timeout during integrity check
- Agent is flagged as compromised — returns negative verdict with signed record

## How this service works

Verify an AI agent's authority and integrity before a transaction; returns a four-state verdict, a signed verification record, and after payment a linked signed settlement receipt

## Output

A four-state verdict (e.g. authorized, unauthorized, compromised, or unknown) indicating the agent's authority and integrity status, plus a cryptographically signed verification record that can be used as tamper-evident proof of the check.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "nonce": {
   "type": "string",
   "minLength": 8
  },
  "timestamp": {
   "type": "string",
   "format": "date-time"
  },
  "partner_id": {
   "type": "string"
  },
  "agent_claim": {
   "type": "object",
   "properties": {
    "agent_id": {
     "type": "string"
    },
    "spiffe_svid": {
     "type": "string"
    },
    "wallet_type": {
     "type": "string"
    },
    "fp_request_id": {
     "type": "string"
    },
    "principal_hint": {
     "type": "string"
    },
    "agent_runtime_hint": {
     "type": "string"
    }
   }
  },
  "passport_id": {
   "type": "string"
  },
  "transaction": {
   "type": "object",
   "required": [
    "amount_display"
   ],
   "properties": {
    "chain": {
     "type": "string"
    },
    "token": {
     "type": "object",
     "properties": {
      "issuer": {
       "type": "string"
      },
      "symbol": {
       "type": "string"
      }
     }
    },
    "amount_display": {
     "type": "string"
    },
    "counterparty_address": {
     "type": "string"
    }
   }
  },
  "declared_scope": {
   "type": "object",
   "properties": {
    "time_window_end": {
     "type": "string",
     "format": "date-time"
    },
    "allowed_counterparties": {
     "type": "array",
     "items": {
      "type": "string"
     }
    },
    "max_amount_per_tx_display": {
     "type": "string"
    }
   }
  },
  "merchant_reference": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/flint-network-ai-agent-verification-0593cbc5/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from flint.network](https://www.zero.xyz/host/flint.network/llms.txt)