# AgentDiet x402 Payment Verifier

> AgentDiet x402 Payment Verifier is a paid API for AI agents from status.agentdiet.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-22).

Verifies x402 HTTP payment requests and confirms proof-of-payment for API access, returning compression ROI proof metadata.

## Facts

- Endpoint: GET https://status.agentdiet.dev/v1/x402-verifier?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-22
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentdiet-x402-payment-verifier-d254847e
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Wo_EfhHzBIxQU7I3yjcRZ

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 agentdiet-x402-payment-verifier-d254847e
```

Example prompt: Use AgentDiet's x402 verifier to check whether this incoming GET request has a valid x402 payment attached before I process it.

## When to prefer this

Choose this endpoint when you need to verify x402-standard HTTP micropayments settled in USDC on Base, especially in agent-to-agent (A2A) or bot-to-agent (B2A) workflows where deterministic payment confirmation is required before serving a resource or API response.

## Known failure modes

- Invalid or missing x402 payment header results in rejection
- Unsupported HTTP method (not GET or POST) causes schema validation error
- Malformed URL in queryParams returns error status
- Payment settled on wrong chain or token (not USDC on Base) fails verification
- Network timeout or node unavailability returns no response

## How this service works

Deterministic B2A/A2A/MCP/x402/MPP/L402 execution and intelligence node at https://status.agentdiet.dev settling in USDC on Base.

## Output

Returns a JSON object with a status field ('ok'), a data object, and an roi_proof object containing the compression_ratio_pct (e.g. 91.4%), confirming whether the x402 payment on the submitted HTTP request is valid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "POST"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "data": {},
  "status": "ok",
  "roi_proof": {
   "compression_ratio_pct": 91.4
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentdiet-x402-payment-verifier-d254847e/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from status.agentdiet.dev](https://www.zero.xyz/host/status.agentdiet.dev/llms.txt)