# LimitGuard Agent Identity & Reputation Check

> LimitGuard Agent Identity & Reputation Check is a paid API for AI agents from api.limitguard.ai, paid per call via x402, $0.1/call, status unknown (last checked 2026-09-14).

Verifies an AI agent's identity and returns a reputation score and risk level before inter-agent transactions

## Facts

- Endpoint: POST https://api.limitguard.ai/v1/mcp/check-agent
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/limitguard-agent-identity-reputation-check-98d21819
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_mp8EqdiZH_FwV5q8Mxn3N

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 limitguard-agent-identity-reputation-check-98d21819 -d '<json body>'
```

Example prompt: Before we let agent 'agent-7f3a2b' (named 'DataFetchBot') participate in this transaction, can you run a LimitGuard reputation check on it to see if it's verified and what its risk level is?

## When to prefer this

Use this endpoint when an AI agent needs to verify the identity and trustworthiness of another AI agent before allowing it to participate in a transaction, delegation, or collaboration — especially in autonomous multi-agent pipelines where trust cannot be assumed. Prefer this over generic entity checks when the subject is specifically an AI agent (identified by agent_id and agent_name) rather than a human, company, or wallet address.

## Known failure modes

- Unknown agent_id returns unverified status with no reputation data
- Missing required fields (agent_id or agent_name) returns a 400 validation error
- Agent not found in the trust registry returns agent_verified: false
- Payment failure for the $0.10 USDC fee returns a 402 error
- Network timeout or service unavailability returns a 503 error

## How this service works

MCP tool: verify AI agent identity and reputation score before inter-agent transactions.

## Output

Returns whether the agent is verified (boolean), a reputation score from 0-100, and a risk level classification (e.g. 'low', 'medium', 'high') for the queried AI agent.

## Response schema (JSON Schema)

```json
{
 "example": {
  "risk_level": "low",
  "agent_verified": true,
  "reputation_score": 95
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/limitguard-agent-identity-reputation-check-98d21819/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.limitguard.ai](https://www.zero.xyz/host/api.limitguard.ai/llms.txt)