New: Seoul Endpoint for Upbit Announcements

April 30, 2026

Last updated 2026-05-01

We're adding a second endpoint dedicated to Upbit announcements.

The new endpoint

"wss://kr.cryptolisting.ws"   # AWS Seoul (ap-northeast-2c — apne2-az3) — Upbit only

Same API key as the Tokyo endpoint. Same message schema. The Seoul endpoint streams Upbit announcements only, so the ?cex=upbit filter is optional there.

Rate limits and connection caps are per-endpoint

Each region tracks its own rate-limit and connection budget. Connections, message rates, IP caps, and cooldowns on Tokyo do not count against Seoul, and vice-versa.

A key with a 3-connection-per-IP cap can hold 3 on Tokyo and 3 on Seoul (6 total). A cooldown on Tokyo does not gate Seoul. Full numbers per tier — SpeedTrial, FreeDelayed (full feed, +240 ms), Basic, and Premium — are in the rate-limits reference.

How to migrate from Tokyo to Seoul (for Korea-based bots)

If your trading bot is hosted in Korea (typically AWS Seoul, ap-northeast-2), connecting to wss://kr.cryptolisting.ws instead of wss://cryptolisting.ws eliminates the Seoul→Tokyo network hop on the detection side for Upbit announcements. The same API key works on both endpoints. The Seoul endpoint streams Upbit only — keep the Tokyo connection if you also need Binance or Bithumb.

Run both endpoints in parallel

For maximum coverage, open one connection to each endpoint simultaneously. Filter the Tokyo connection to ?cex=binance,bithumb to avoid duplicate Upbit events:

# Two connections, no duplicates
tokyo = WebSocketApp("wss://cryptolisting.ws?cex=binance,bithumb", header=["X-API-Key: ..."], ...)
seoul = WebSocketApp("wss://kr.cryptolisting.ws",                 header=["X-API-Key: ..."], ...)

What about Bithumb?

Bithumb is currently only dispatched from Tokyo. For Bithumb-only bots in Korea, the network round-trip Korea→Tokyo→Korea is the dominant latency component — see Bithumb listing alerts for details.

This article is for informational purposes only and is not financial advice. CryptoListing.ws is a technical data feed service — see Legal.

Related

• The Upbit Listing Effect & Kimchi Premium Explained — why Upbit listing notices produce some of the largest crypto pumps.
• Bithumb vs Upbit: Korean Exchange Listing Notice Strategy — comparing the two largest Korean exchanges and how to monitor both.
• How to Detect New Crypto Listing Announcements in Real-Time — comparison of detection methods.