Seoul subway real-time arrival API

Next trains at any Seoul subway station right now: line, destination, direction, minutes away, express and last-train flags. Station names accepted in English, Japanese or Korean (e.g. "Hongik Univ.", "弘大入口", "홍대입구").

Use cases

Tourist apps showing live departures in the visitor's language
AI agents planning "how do I get back to my hotel tonight?"
Event apps: last-train warnings after concerts

Three ways to call it

1. RapidAPI (card billing, free tier)

Call it with a RapidAPI key. Free plan: 100 calls/month; paid from $9.90/month. RapidAPI

2. x402 (AI agents pay per call)

No account or key: $0.02 per call in USDC on Base, or JPYC/USDT on Kaia. The agent only signs; no gas. USDT can be withdrawn straight to the Kaia network from major exchanges: Binance, OKX, Upbit, Bithumb, Bitget, Bitfinex.

curl "https://api.k-agentpay.com/v1/seoul/subway?station=Hongik%20Univ.&lang=en"   # → 402 Payment Required, then pay with any x402 v2 client

3. MCP (Claude, Cursor, …)

Add the MCP server to your agent. MCP setup

Languages

Every endpoint answers in English (lang=en), Japanese (lang=ja) or Korean (lang=ko).

Need other Korea data?

Ask for it, free: GET https://api.k-agentpay.com/v1/request?want=... · request API

OpenAPI: /openapi.json · catalog: /v1 · contact@k-agentpay.com