# Upbit Kimchi Premium Data via x402

> Upbit Kimchi Premium Data via x402 is a paid API for AI agents from kr-x402-mvp.kgy5612.workers.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).

Returns live kimchi premium percentages for BTC and ETH by comparing Upbit KRW prices to global USD prices, plus USD/KRW FX rate, paid per-call via x402 USDC.

## Facts

- Endpoint: GET https://kr-x402-mvp.kgy5612.workers.dev/api/v1/nofx/upbit/hot?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-31
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/upbit-kimchi-premium-data-via-x402-2abd73a0
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_P2VPQeXTf9P8DEM6JMa68

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 upbit-kimchi-premium-data-via-x402-2abd73a0
```

Example prompt: What's the current kimchi premium for BTC and ETH — show me the Upbit KRW prices, the global USD prices, and the premium percentage both FX-adjusted and USDT-adjusted, along with the USD/KRW rate?

## When to prefer this

Choose this endpoint when you specifically need Korea Upbit KRW pricing and the kimchi premium differential vs global exchanges (Coinbase, Kraken, Bitstamp). It aggregates multi-venue global prices and FX rates into a single premium calculation you'd otherwise have to build yourself. Ideal for arbitrage monitoring, cross-border trading strategies, or any agent that needs to know whether Korean crypto prices are significantly above global prices. Prefer over general price APIs when the Korea-specific premium is the primary signal you need.

## Known failure modes

- x402 payment failure if USDC balance insufficient or Base network congestion
- Upbit API unavailable causing stale or missing KRW prices
- FX rate API (open.er-api.com) rate limit or outage resulting in no USD/KRW data
- Invalid or unsupported symbol in 'symbols' query param returning empty assets array
- Worker timeout if multiple upstream APIs are slow simultaneously

## How this service works

Pay-per-call crypto microdata for trading/onchain AI agents via x402 (USDC on Base): Base gas, token risk, balances, multi-venue prices, Hyperliquid book/funding, kimchi premium. No API keys.

## Output

A JSON object with an 'assets' array where each entry contains the symbol, Upbit KRW price, global USD price, FX-adjusted kimchi premium %, and USDT-adjusted kimchi premium %. Also includes the USD/KRW FX rate, Upbit's implied USDT/KRW rate, data sources list, and an updated_at timestamp.

## 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": {
      "symbols": {
       "type": "string",
       "examples": [
        "BTC,ETH",
        "BTC"
       ],
       "description": "Comma-separated filter (default BTC,ETH)"
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "assets": [
   {
    "symbol": "BTC",
    "upbit_krw": 108533000,
    "global_usd": 80867.7,
    "premium_pct_fx": 1.15,
    "premium_pct_usdt": 0.16
   },
   {
    "symbol": "ETH",
    "upbit_krw": 3162000,
    "global_usd": 2356.1,
    "premium_pct_fx": 1.15,
    "premium_pct_usdt": 0.15
   }
  ],
  "usdkrw": 1326.8,
  "sources": [
   "https://api.upbit.com",
   "https://api.exchange.coinbase.com",
   "https://api.kraken.com",
   "https://www.bitstamp.net",
   "https://open.er-api.com"
  ],
  "updated_at": "2026-10-28T03:00:00Z",
  "upbit_usdt_krw": 1340
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/upbit-kimchi-premium-data-via-x402-2abd73a0/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from kr-x402-mvp.kgy5612.workers.dev](https://www.zero.xyz/host/kr-x402-mvp.kgy5612.workers.dev/llms.txt)