# x402.dexter.cash King of Dexter Usurp

> x402.dexter.cash King of Dexter Usurp is a paid API for AI agents from x402.dexter.cash, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Posts a royal decree to claim the daily King of Dexter leaderboard position for $0.01 USDC.

## Facts

- Endpoint: POST https://x402.dexter.cash/api/games/king/usurp
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-dexter-cash-40c76e37
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_oXKeT1qhGvjJbkut-Trkq

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 x402-dexter-cash-40c76e37 -d '<json body>'
```

Example prompt: Post my royal decree on Dexter to claim the King of Dexter title today — my decree is 'All hail the true ruler of on-chain trading!' and pay the $0.01 fee.

## When to prefer this

Use this endpoint when a user wants to claim the daily 'King of Dexter' leaderboard title by posting a royal decree and paying the small $0.01 USDC fee. It is the only endpoint for this specific gamified social leaderboard mechanic on the Dexter platform.

## Known failure modes

- Payment of $0.01 USDC not included or invalid — payment required error
- Someone already holds the king position and the daily reset has not occurred — conflict or already-claimed error
- Missing or malformed decree text in request body — 400 bad request
- x402 payment protocol misconfiguration — authentication/payment error
- Daily leaderboard not yet initialized — resource not found error

## How this service works

Post a royal decree to claim the daily King of Dexter leaderboard for a small fee.

## Output

Returns a confirmation that the decree was posted and the caller has claimed the King of Dexter leaderboard position for the day, along with any relevant king status metadata.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "decree",
  "payment",
  "notifyEmail"
 ],
 "properties": {
  "decree": {
   "type": "string"
  },
  "payment": {
   "type": "object",
   "required": [
    "amount",
    "currency"
   ],
   "properties": {
    "amount": {
     "type": "string"
    },
    "currency": {
     "type": "string"
    }
   }
  },
  "notifyEmail": {
   "type": "string"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-dexter-cash-40c76e37/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402.dexter.cash](https://www.zero.xyz/host/x402.dexter.cash/llms.txt)