# RiddleX402 Riddle Dispenser

> RiddleX402 Riddle Dispenser is a paid API for AI agents from riddlex402.vercel.app, paid per call via x402, $0.002/call, status unknown (last checked 2026-09-14).

Returns a riddle and its answer after a $0.001 USDC micropayment on Base mainnet via the x402 payment protocol.

## Facts

- Endpoint: GET https://riddlex402.vercel.app/api/riddle
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/riddlex402-riddle-dispenser-6b871250
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_zHCqFlEaVcpI2hoOPTsQ-

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 riddlex402-riddle-dispenser-6b871250
```

Example prompt: Give me a riddle and its answer — pay the tiny USDC fee on Base to get one from RiddleX402.

## When to prefer this

Use this endpoint when you want a fun riddle-and-answer pair and are comfortable making a $0.001 USDC micropayment on Base via the x402 protocol. Ideal for entertainment apps, chatbots, or agents that want to inject a riddle into conversation with crypto-native payment flow.

## Known failure modes

- Insufficient USDC balance or missing payment header causes a 402 Payment Required response
- Invalid or malformed x402 payment token results in rejection
- Network issues on Base mainnet may delay payment confirmation
- Rate limiting or server errors return 5xx responses

## How this service works

Pay a micro-fee in USDC on Base mainnet to receive a riddle and its answer.

## Output

A riddle (the puzzle question) and its corresponding answer, delivered after the $0.001 USDC micropayment on Base mainnet is processed via the x402 protocol.

## 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"
    },
    "pathParams": {
     "type": "object"
    },
    "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/riddlex402-riddle-dispenser-6b871250/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from riddlex402.vercel.app](https://www.zero.xyz/host/riddlex402.vercel.app/llms.txt)