# x402mailbox Mailbox Reader

> x402mailbox Mailbox Reader is a paid API for AI agents from x402mailbox.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-11-05).

Retrieves messages from a pay-per-access x402 mailbox endpoint hosted on Vercel

## Facts

- Endpoint: GET https://x402mailbox.vercel.app/mailbox?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-11-05
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402mailbox-mailbox-reader-2e2b4581
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Vt_usQHfStOthYPYxIqsb

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 x402mailbox-mailbox-reader-2e2b4581
```

Example prompt: Check my x402mailbox at x402mailbox.vercel.app and retrieve any messages waiting in the inbox — it costs $0.01 USDC per read.

## When to prefer this

Use this endpoint when you need to read messages from an x402-protocol-gated mailbox specifically hosted at x402mailbox.vercel.app, particularly in workflows where micropayment-per-access messaging is required or where the x402 payment rail is already integrated.

## Known failure modes

- Payment not authorized — x402 payment handshake fails, returning 402 Payment Required
- Insufficient USDC balance — payment cannot be completed
- Mailbox empty — successful response but no messages returned
- Network/Vercel downtime — service temporarily unavailable
- Invalid or expired payment token — authentication rejected

## How this service works

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## Output

Returns the current contents of the x402-protected mailbox, likely a list of messages or message payloads accessible after the $0.01 USDC micropayment is authorized and processed.

## 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"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {}
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402mailbox-mailbox-reader-2e2b4581/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402mailbox.vercel.app](https://www.zero.xyz/host/x402mailbox.vercel.app/llms.txt)