# Bithumb Open API vs KuCoin

> KuCoin scores 53.9 (D) to Bithumb Open's 50.6 (D) for exchange market data. Prices, MCP, x402, uptime and agent notes side by side.

- Canonical: https://www.anchorterminal.com/compare/bithumb-vs-kucoin
- Markdown: https://www.anchorterminal.com/compare/bithumb-vs-kucoin.md (~4,250 tokens)
- Site index for agents: https://www.anchorterminal.com/llms.txt (the key docs and every listing in one file, at most 16 MB, about 4 million tokens: https://www.anchorterminal.com/llms-full.txt)
- API: https://www.anchorterminal.com/api/v1/index.json
- MCP: https://www.anchorterminal.com/mcp (the whole catalogue as tools, no key)
- DNS: dig +short TXT <slug>.grade.anchorterminal.com (the grade as a DNS TXT record, for a sandbox with no HTTP where names still resolve; also top., best.<category>. and <a>.vs.<b>. under the zone, and the same under grade.letme.dev)
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)
- Updated: 2026-11-03

KuCoin scores 53.9 (D) on agent readiness against Bithumb Open API's 50.6 (D), and leads in 4 of 7 scored categories. Bithumb Open API leads on agent ergonomics and security & auth. Both do exchange market data.

- Bithumb Open API: grade D, 50.6/100, rank #999 of 1349. Markdown https://www.anchorterminal.com/tools/bithumb.md · JSON https://www.anchorterminal.com/api/v1/tools/bithumb.json
- KuCoin: grade D, 53.9/100, rank #891 of 1349. Markdown https://www.anchorterminal.com/tools/kucoin.md · JSON https://www.anchorterminal.com/api/v1/tools/kucoin.json
- Best crypto exchange APIs and MCP servers for AI agents: https://www.anchorterminal.com/best/crypto-exchanges/index.md
- All 210 exchanges comparisons: https://www.anchorterminal.com/compare/crypto-exchanges/index.md

## Which one, for what

### Bithumb Open API (D)

Good for: KRW-market trading for agents acting for a verified Korean account, with a vendor-built MCP server, CLI and skills.

Ahead on:
- Agent ergonomics, 67 against 62
- Security & auth, 60 against 55

Also in its favour:
- Runs on your own machine

Watch for: No sandbox or testnet; every order uses real funds

### KuCoin (D)

Good for: An agent trading spot, margin and futures in a person's KuCoin account outside the restricted list, with no sandbox and no MCP server, so through the SDK or raw REST.

Ahead on:
- Reliability, 45 against 34
- Payments & pricing, 35 against 15
- Transparency & trust, 54 against 47

Watch for: No official MCP server; the registry's `kucoin` entry is a third party's keyless market-data package


## Why the edge

### Payments & pricing: KuCoin +20

- Bithumb Open API (15): No machine payment protocol (0). The fee page timed out on every attempt, so no price is recorded (0 of 20, unchecked). Public market data needs no key, card or account; trading needs a verified Korean account. Judgement call (15 of 20). A person must sign up, pass identity checks and issue keys in the browser (0). 0 + 0 + 15 + 0 = 15.
- KuCoin (35): No machine payment protocol (0). The spot base fee is stated in support articles without login, the futures base rate and the full tier table sit in images or behind script (15 of 20). Market data needs no key, no card is asked for at sign-up (20). A person registers, verifies identity and mints the key in a browser (0). 35.

### Reliability: KuCoin +11

- Bithumb Open API (34): Read with the hosted lines. No status page found on apidocs.bithumb.com or in llms.txt; wallet-status and notices endpoints stand in (0). No readable incident history, though two notices record a public WebSocket interruption and a brief service break (5). Rate limits documented per category with numbers, updated 27 October 2026 (15). A breach is described only as a temporary restriction, with no status code, header or Retry-After, and no client order id or idempotency key is documented; 422 order_not_ready and 500 server_error say to retry later (4 of 15). No SLA found (0). The API is generally available; the MCP server and CLI are at 0.8.5 (10). 0 + 5 + 15 + 4 + 0 + 10 = 34.
- KuCoin (45): Graded with the hosted lines on the API at api.kucoin.com. No status page found (status.kucoin.com does not resolve, the docs link none), so 0 for the page and 5 for no readable history. Rate limits are published per VIP level with per-endpoint weights and IP limits for public endpoints (15). Every response carries gw-ratelimit-limit, gw-ratelimit-remaining and gw-ratelimit-reset, 429000 is documented with a wait rule, and orders take a clientOid the docs recommend as a UUID (15). No SLA (0). The UTA V2 API is the production surface (10). 45.

### Transparency & trust: KuCoin +7

- Bithumb Open API (47): The editorial half. A closed service whose terms couldn't be read (timeouts and a title-only page); the kit is MIT with a disclaimer naming Bithumb Co., Ltd. (10 of 30). No privacy policy read (0 of 30, unchecked). Dated retirement of WebSocket Private v1 and effective dates on breaking notices (14 of 20). No subprocessor or data-location statement read (0 of 20). 10 + 0 + 14 + 0 = 24.
- KuCoin (54): The editorial half. A closed hosted service with terms that are clear on use, liability and law but name no company (12 of 30). The privacy policy gives retention periods by purpose and provider (2 years after closure, 14 months for Firebase, 3 years for Jumio, 5 years for Sumsub) and names 41 services, with no data centre locations (22 of 30). Endpoints are removed and fields deprecated in dated changelog entries with no notice period or policy (8 of 20). Third parties named by service, locations not stated beyond transfers around the globe (10 of 20). 52.

### Agent ergonomics: Bithumb Open API +5

- Bithumb Open API (67): Graded on the REST API with the MCP server. 41 tools in all, selectable by module, so 15 for 11 to 30 or more and 8 added back for the module switch (23 of 25). Candle counts, order paging and a 200-market cap on the ticker (13 of 20). Stable error.name values with retry guidance for order_not_ready and server_error (14 of 20). No client order id or idempotency key documented; the CLI's per-profile read-only flag, the MCP --read-only flag and the skills' read-only gate help, and readOnlyHint annotations weren't checked (9 of 20). Few required parameters, but no official SDK beyond the CLI and a CCXT guide (8 of 15). 23 + 13 + 14 + 9 + 8 = 67.
- KuCoin (62): Read for the API alone, since there is no MCP server. Responses take limit and cursor parameters on list endpoints and the order book depth is a parameter (14 of 25). Pagination and symbol filters on orders, fills and ledgers (15 of 20). Codes and messages per response, with the V2 scheme claimed to be clearer; the rate-limit page's own examples contradict its table, which costs an agent a turn (12 of 20). clientOid on orders makes retries safe; no MCP annotations to read (10 of 20). Three required fields on a spot order, official SDKs in five languages (11 of 15). 62.

### Security & auth: Bithumb Open API +5

- Bithumb Open API (60): Keys scoped to chosen permissions, mandatory registered IPs, one-year expiry, a JWT per request and a key-list endpoint with expiry (26 of 30). Read-only keys, `--read-only` on the MCP server, per-profile read_only on the CLI, a second factor on KRW deposits and withdrawals, and skills that refuse to switch profiles to bypass read-only; nothing server-side confirms an order (16 of 20). The API returns exchange data and the disclaimer warns about prompt injection through third-party plugins (11 of 15). A local audit log for CLI and MCP calls and a key-list endpoint; no server-side per-call log (7 of 15). security.txt timed out and no disclosure policy, bug bounty or certification was found (0 of 20, security.txt unchecked). 26 + 16 + 11 + 7 + 0 = 60.
- KuCoin (55): API key with a user-set passphrase, HMAC-SHA256 signing, nine permission groups, IP allow-lists required for Withdrawal and FlexTransfers, trading keys without an IP disabled after 30 days of inactivity, revocation on the management page; no OAuth and no expiry on General keys (24 of 30). A General-only key is a true read-only mode and withdrawals are a separate permission; no confirmation step for writes beyond the key scope (12 of 20). Tools return the exchange's own data (10). The API key info endpoint shows permissions and IP lists; no per-call audit log was found (5 of 15). No security.txt, no disclosure policy or bounty on a page we could read, a whistleblower notice on the legal page (4 of 20). 55.

## Score by category

| Category | Weight | Bithumb Open API | KuCoin | Edge |
| --- | --- | --- | --- | --- |
| Reliability | 16% (20 this run) | 34 | 45 | KuCoin +11 |
| Performance | 10%, pending | pending | pending | not scored in this run |
| Schema & documentation | 13% (16.2 this run) | 64 | 60 | Bithumb Open API +4 |
| Agent ergonomics | 13% (16.2 this run) | 67 | 62 | Bithumb Open API +5 |
| Security & auth | 14% (17.5 this run) | 60 | 55 | Bithumb Open API +5 |
| Payments & pricing | 10% (12.5 this run) | 15 | 35 | KuCoin +20 |
| Task success | 10%, pending | pending | pending | not scored in this run |
| Maintenance & community | 7% (8.8 this run) | 69 | 73 | KuCoin +4 |
| Transparency & trust | 7% (8.8 this run) | 47 | 54 | KuCoin +7 |
| Negative events | ≤15 | 0 | 0 | |
| **Total** | | **50.6 · D** | **53.9 · D** | |

## Facts side by side

| Fact | Bithumb Open API | KuCoin |
| --- | --- | --- |
| Kind | HTTP API | HTTP API |
| Vendor | Bithumb Co., Ltd. | KuCoin |
| Hosted endpoint | no (local only) | no (local only) |
| Transports | stdio |  |
| Auth | API key | API key |
| Pricing | Pay per use | Pay per use |
| x402 | no | no |
| Tools exposed | 41 | none |
| Read-only variant documented | yes | yes |
| llms.txt | yes | no |
| Last release | 2026-10-13 | 2026-11-02 |
| Terms last updated | couldn't be read | no date given |
| Privacy policy last updated | no document linked | no date given |
| Customer content may train models | couldn't be read | not found in the text |
| Terms restrict automated access | couldn't be read | yes |
| Terms restrict benchmarking | couldn't be read | not found in the text |
| Terms or service can change without notice | couldn't be read | yes |
| Arbitration or class-action waiver | couldn't be read | yes |
| Popularity | 6 stars | 55 stars |

## Verdicts

**Bithumb Open API.** Bithumb runs an official local MCP server with 41 tools, module selection and a read-only flag, beside a CLI with per-profile read-only gating and six agent skills, over an API with scoped one-year keys and a mandatory IP list. There is no sandbox, no status page, no documented 429 behaviour, and the fees and terms couldn't be read.

**KuCoin.** KuCoin publishes pooled rate limits with remaining and reset headers, scoped keys where withdrawals and transfers need an IP allow-list, an official SDK in five languages and read-only agent skills. It runs no MCP server, has no sandbox, status page or OpenAPI file, and its terms name no legal entity.

## Before you call either

### Bithumb Open API

1. Ask for a key with asset and order inquiry plus order placement only, never withdrawals, with your IP registered; keys expire after one year and a wrong IP answers 401 NotAllowIP
2. Start the server with `--modules market,account,trade --read-only` for analysis and drop `--read-only` only when the person asks to trade; deposit and withdraw modules stay off
3. Prefer the `bithumb` CLI for writes, as the skills do, and check `bithumb config show --json` for a read-only profile before any order
4. Keep the ticker's markets parameter at 200 or fewer, batch orders at 30 and cancels at 30 per request, and stay under 140 private calls a second per category
5. Retry 422 order_not_ready and 500 server_error after a pause; there is no sandbox, so start with the smallest order the market allows

### KuCoin

1. Mint a key with General only for research; add Spot or Futures only with an IP allow-list, since unbound trading keys are disabled after 30 days of inactivity
2. Send a UUID clientOid on every order and keep it for the retry, and read the order back by clientOid before placing again
3. Budget requests by weight against gw-ratelimit-remaining and sleep for gw-ratelimit-reset milliseconds on 429000; sub-accounts share the pool
4. There is no sandbox, so rehearse with the smallest order size on a dedicated sub-account
5. Use the UTA V2 endpoints and hosts; the Classic API loses endpoints without notice, as the margin credit endpoints did on 21 October 2026

## Questions

### Which is better for AI agents, Bithumb Open API or KuCoin?

KuCoin scores 53.9 (D) on agent readiness against Bithumb Open API's 50.6 (D), and leads in 4 of 7 scored categories. Bithumb Open API leads on agent ergonomics and security & auth.

### Do Bithumb Open API and KuCoin need an API key?

Both need an API key.

### Can an agent call Bithumb Open API and KuCoin without installing anything?

Bithumb Open API runs on your own machine, with no hosted endpoint listed. No hosted endpoint is listed for KuCoin.


## For agents

- This comparison as JSON: https://www.anchorterminal.com/compare/bithumb-vs-kucoin.json, and with the fewest tokens: https://www.anchorterminal.com/compare/bithumb-vs-kucoin.min.md
- Over MCP at https://www.anchorterminal.com/mcp (no key): `compare_tools {"a": "bithumb", "b": "kucoin"}`. From a terminal: `anchor compare bithumb kucoin`
- Each listing in full: https://www.anchorterminal.com/api/v1/tools/bithumb.json and https://www.anchorterminal.com/api/v1/tools/kucoin.json

## Other comparisons with Bithumb Open API or KuCoin

- [Bitfinex API vs Bithumb Open API](https://www.anchorterminal.com/compare/bitfinex-vs-bithumb.md)
- [Bitfinex API vs KuCoin](https://www.anchorterminal.com/compare/bitfinex-vs-kucoin.md)
- [Bitget vs Bithumb Open API](https://www.anchorterminal.com/compare/bitget-vs-bithumb.md)
- [Bitget vs KuCoin](https://www.anchorterminal.com/compare/bitget-vs-kucoin.md)
- [Bithumb Open API vs Bitstamp API](https://www.anchorterminal.com/compare/bithumb-vs-bitstamp.md)
- [Bithumb Open API vs Bybit](https://www.anchorterminal.com/compare/bithumb-vs-bybit.md)
- [Bithumb Open API vs Coinbase Advanced Trade API](https://www.anchorterminal.com/compare/bithumb-vs-coinbase-advanced-trade.md)
- [Bithumb Open API vs Coinbase MCP server (Coinbase for Agents)](https://www.anchorterminal.com/compare/bithumb-vs-coinbase-mcp.md)
- [Bithumb Open API vs Crypto.com Exchange API](https://www.anchorterminal.com/compare/bithumb-vs-crypto-com-exchange.md)
- [Bithumb Open API vs Deribit](https://www.anchorterminal.com/compare/bithumb-vs-deribit.md)
- [Bithumb Open API vs dYdX](https://www.anchorterminal.com/compare/bithumb-vs-dydx.md)
- [Bithumb Open API vs Gate](https://www.anchorterminal.com/compare/bithumb-vs-gate-io.md)
- [Bithumb Open API vs Gemini Exchange API](https://www.anchorterminal.com/compare/bithumb-vs-gemini-exchange.md)
- [Bithumb Open API vs HTX trading API](https://www.anchorterminal.com/compare/bithumb-vs-htx.md)
- [Bithumb Open API vs Hyperliquid](https://www.anchorterminal.com/compare/bithumb-vs-hyperliquid.md)
- [Bithumb Open API vs Kraken API](https://www.anchorterminal.com/compare/bithumb-vs-kraken.md)
- [Bithumb Open API vs MEXC API](https://www.anchorterminal.com/compare/bithumb-vs-mexc.md)
- [Bithumb Open API vs OKX API](https://www.anchorterminal.com/compare/bithumb-vs-okx.md)
- [Bithumb Open API vs Uniswap Trading API](https://www.anchorterminal.com/compare/bithumb-vs-uniswap.md)
- [Bithumb Open API vs Upbit Open API](https://www.anchorterminal.com/compare/bithumb-vs-upbit.md)
- [Bitstamp API vs KuCoin](https://www.anchorterminal.com/compare/bitstamp-vs-kucoin.md)
- [Bybit vs KuCoin](https://www.anchorterminal.com/compare/bybit-vs-kucoin.md)
- [Crypto.com Exchange API vs KuCoin](https://www.anchorterminal.com/compare/crypto-com-exchange-vs-kucoin.md)
- [Gate vs KuCoin](https://www.anchorterminal.com/compare/gate-io-vs-kucoin.md)
- [Gemini Exchange API vs KuCoin](https://www.anchorterminal.com/compare/gemini-exchange-vs-kucoin.md)
- [HTX trading API vs KuCoin](https://www.anchorterminal.com/compare/htx-vs-kucoin.md)
- [KuCoin vs MEXC API](https://www.anchorterminal.com/compare/kucoin-vs-mexc.md)
- [KuCoin vs OKX API](https://www.anchorterminal.com/compare/kucoin-vs-okx.md)
- [KuCoin vs Uniswap Trading API](https://www.anchorterminal.com/compare/kucoin-vs-uniswap.md)
- [KuCoin vs Upbit Open API](https://www.anchorterminal.com/compare/kucoin-vs-upbit.md)
- [Binance API vs Bithumb Open API](https://www.anchorterminal.com/compare/binance-vs-bithumb.md)
- [Binance API vs KuCoin](https://www.anchorterminal.com/compare/binance-vs-kucoin.md)
- [Coinbase Advanced Trade API vs KuCoin](https://www.anchorterminal.com/compare/coinbase-advanced-trade-vs-kucoin.md)
- [Coinbase MCP server (Coinbase for Agents) vs KuCoin](https://www.anchorterminal.com/compare/coinbase-mcp-vs-kucoin.md)
- [Kraken API vs KuCoin](https://www.anchorterminal.com/compare/kraken-vs-kucoin.md)
- [Deribit vs KuCoin](https://www.anchorterminal.com/compare/deribit-vs-kucoin.md)
- [dYdX vs KuCoin](https://www.anchorterminal.com/compare/dydx-vs-kucoin.md)
- [Hyperliquid vs KuCoin](https://www.anchorterminal.com/compare/hyperliquid-vs-kucoin.md)

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Query this catalogue directly over MCP: https://www.anchorterminal.com/mcp (Streamable HTTP, no key). How: https://www.anchorterminal.com/agents/#mcp