Deribit vs MEXC API

Deribit 88

OpenAPI 3.0.0 for the whole JSON-RPC surface (Deribit API 2.1.1, about 1.4 million characters) plus AsyncAPI files for the WebSocket side (25). llms.txt with production and upcoming indexes, and a Markdown twin of every page (10). Each operation has a description such as "Places a buy order for an instrument." with parameter notes, and the articles say when to use WebSocket subscriptions over polling, but the reference seldom says when not to use a method (13 of 20). Parameters are typed with enums (order type has eight values, time_in_force four) and required flags, with amount or contracts as a documented either-or (13 of 15). Every reference page carries an example request and response, and the errors page lists about 159 codes with retry guidance, though most operations document only a 200 response and the smaller error tables disagree with the full one on two codes (12 of 15). A versioned path (/api/v2), a production and an upcoming docs branch, and a dated changelog of 64 entries since 21 January 2020 (15). Total 88.

MEXC API 64

No OpenAPI found; a Postman collection and the CLI's 25 capability reference files are the nearest machine-readable contract (5 of 25). llms.txt on mexc.com, written for assistants and pointing at the API docs and legal pages (7 of 10). Per-endpoint pages with purpose, parameters and permissions, without when-not-to-use guidance (13 of 20). Typed parameters with enums for order types, statuses and intervals (11 of 15). Examples on each endpoint and a separate error-code page with numeric codes and messages (13 of 15). Versioned API (v3) with a dated changelog of 72 entries to 23 October 2026 (15). 5 + 7 + 13 + 11 + 13 + 15 = 64.

Deribit 46

The editorial half. A closed service whose terms (Deribit FZE membership terms and DRB Panama Inc. terms) sit on a support site that answered 403, with the entity confirmed on VARA's register (12 of 30). The privacy policy was not read, and nothing in the docs states retention (0 of 30). The changelog marks deprecations and the upcoming docs branch previews the next release, but removals such as public/get_index on 25 November 2025 carry no notice period (10 of 20). No subprocessor or data-location statement found (0 of 20). Total 22.

MEXC API 58

The editorial half. A closed service with a dated user agreement naming MEXC (Comoros) Ltd; the CLI is UNLICENSED on npm (15 of 30). The privacy policy names no entity, states no retention periods and relies on standard contractual clauses for transfers (10 of 30). The changelog flags endpoints as "will be discontinued soon" without dates and the futures log records removals (8 of 20). Third parties are named by category only, with no subprocessor list or data locations (5 of 20). 15 + 10 + 8 + 5 = 38.

Deribit 74

An API, read for response sizing. public/get_order_book takes depth, get_instruments filters by currency and kind, and history methods take count and offset, though get_instruments returns every instrument for a currency and costs 10,000 credits (18 of 25). Count and offset pagination, time ranges on trade and transaction logs, and WebSocket channels with interval and depth options (16 of 20). Numeric error codes with short names, a wait value on some errors, and sample code that branches on them (18 of 20). A nonce on orders since May 2026 returns the existing order on retry, a label lets an agent find its own orders, and 10040 marks the calls safe to retry; no MCP annotations apply (16 of 20). Few required parameters and sensible defaults (limit and good_til_cancelled), but no official SDK in any language, so every caller signs and frames JSON-RPC itself (6 of 15). Total 74.

MEXC API 64

Graded on the REST API with the CLI's MCP mode. Responses take limit parameters and the MCP read-only market subset is 22 tools, but a full spot MCP category lists 123 tools (15 of 25). startTime, endTime and limit on history, symbol filters on open orders (14 of 20). Numeric codes with messages, a 30035 order-limit code added 23 October 2026, 5xx guidance (14 of 20). newClientOrderId is optional with no idempotency guarantee; the CLI adds --dry-run and a confirmation step (10 of 20). Few required parameters; SDKs in five languages whose repository was last pushed in February 2024 (11 of 15). 15 + 14 + 14 + 10 + 11 = 64.

Deribit 65

Read as a closed service. The JSON-RPC changelog's latest production entry is 13 October 2026 and an entry dated 5 November 2026 describes the next release; Deribit's posts of 14 October and 2 November 2026 change fees (30). Entries of 18 August, 15 September and 13 October 2026, three in 90 days (20). A public changelog and a support site; whether support answers wasn't tested and the support site refused our reader (10 of 15). No official SDK and no MCP registry entry (0). The OpenAPI and AsyncAPI files are maintained with the docs (5 of 10). Total 65.

MEXC API 75

Read as a closed service. Last dated change 23 October 2026 in both the spot and futures logs (30). Spot entries on 14 August, 24 August, 11 September and 23 October 2026, futures on 1 September, 11 September, 19 October and 23 October (20). An API support Telegram group, a ticket form and dated changelogs; GitHub issues not read (10 of 15). The official SDK repository was last pushed in February 2024 while the CLI is current (10 of 15). The CLI ships platform binaries with no dependencies and no public repository or CI; the SDK is stale (5 of 10). 30 + 20 + 10 + 10 + 5 = 75.

Deribit 25

No machine payment protocol (0). The fee schedule is on support.deribit.com, which answered 403; Deribit's own posts give VIP4 to VIP7 taker fees and the 0 bps linear options maker fee, so partial prices are public but the lowest tier is unchecked (5 of 20). Public market data needs no key and the test environment is free, with no card anywhere (20). A person signs up in a browser with identity checks before any key exists (0). Total 25.

MEXC API 31

No machine payment protocol (0). Fees published without login on MEXC's own fee guide (20 October 2026) and a 2024 announcement, with a separate API futures schedule; the fee page itself is drawn by script (16 of 20). Public market data needs no key or card; trading needs a verified and funded account. Judgement call (15 of 20). A person must sign up in a browser, and futures need identity verification (0). 0 + 16 + 15 + 0 = 31.