# carryroom > Funding rates of crypto perpetual futures across 49 exchanges, and the cross-exchange pairs that capture the gap between them, ranked after trading costs. Read-only JSON API with no key and no sign-up. Every page exists in three languages: the URLs below are English; put `/ja` or `/zh` in front of the path for Japanese or Simplified Chinese. Numbers are stated as fractions per 8 hours unless a field name says otherwise; `https://www.carryroom.com/api/v1` returns the unit of every field it can return. Throttling: at most one call per second, and 60 per 5 minutes, counted per API key or per IP address when there is no key. Over that you get 429 with Retry-After; wait that many seconds and repeat the same call. ## Pages - [Crypto Funding Rate Arbitrage Screener](https://www.carryroom.com): Compare funding rates on crypto perps across exchanges, refreshed every few minutes, and rank what is left after fees, spread and slippage come out. - [Realised Funding Rate Arbitrage Rankings](https://www.carryroom.com/carry): Crypto funding rate arbitrage pairs whose gap held one direction, ranked by realised yearly rate after costs and borrowing, with 15/30/90-day stability. - [Staking and Lending × Short the Perp](https://www.carryroom.com/yield): Staking and lending yield, set beside the funding you collect for shorting the same asset's perp: buy spot, sell the future, over thirty days. - [BTC and ETH Option Quotes Next to Funding](https://www.carryroom.com/options): The 100 crypto option combinations paying most per year: a BTC, ETH or other contract sold on the option board, hedged with perps, premium plus funding. - [Crypto Option Strategy Backtest Results](https://www.carryroom.com/options/backtest): Four crypto option strategies (BTC, ETH and others), figures only: what each is, how many independent cases, the period, the result, and variants tried. - [Stablecoin Depegs, Exchange Notices, Price Gaps](https://www.carryroom.com/news): Stablecoin depegs, crypto exchange notices (delistings, halted withdrawals) and price gaps between exchanges, DEX pools and oracle venues, by date. - [About carryroom — Funding Rate Comparison](https://www.carryroom.com/about): carryroom compares funding rates on crypto perps across exchanges. What is collected, how the numbers are built, and who runs it. No orders, no advice. - [What Is a Funding Rate? Crypto Perps Explained](https://www.carryroom.com/method): What a funding rate on crypto perps is, why it differs by exchange, how hourly and 8-hourly rates are annualised, and how costs come out. Also the risks. - [What Is Crypto Funding Rate Arbitrage?](https://www.carryroom.com/funding-rate-arbitrage): Hold the same asset long on one exchange and short on another: price moves cancel and you keep the funding gap. Why rates differ, and what survives costs. - [How to Run a Funding Rate Arbitrage](https://www.carryroom.com/howto): What you need before you start, the order you open in, what to watch while you hold, and how to close. No amounts or thresholds — not investment advice. - [Funding Rate Arbitrage Calculator](https://www.carryroom.com/funding-rate-calculator): Work out a delta-neutral funding rate arbitrage: from your capital, two exchanges' rates and intervals, days, leverage and costs, get the net and annual rate. - [Crypto Funding Rate API for Perpetual Futures](https://www.carryroom.com/api): Perpetual futures funding rates, prices and market events as JSON, with push for new events. No key or sign-up; agent skill for Claude Code, Codex, Gemini CLI. - [Disclaimer](https://www.carryroom.com/terms): Disclaimer. carryroom is a viewer for public market data, not investment advice. Trading perpetual futures can lose you more than you put in. - [Privacy Policy](https://www.carryroom.com/privacy): Privacy policy. How access information is handled, how cookies are used for advertising, and the policy on external links. - [Contact](https://www.carryroom.com/contact): How to reach carryroom, and the questions we are asked most. The operator's name and address are posted on this page as well. ## API - [OpenAPI specification](https://www.carryroom.com/openapi.json): every endpoint, every field, and its unit. - [MCP server](https://www.carryroom.com/mcp): Streamable HTTP, read-only tools (list_venues, get_funding_rates, get_contract, get_carry_pairs, get_events); card at https://www.carryroom.com/.well-known/mcp/server-card.json. - [API catalog](https://www.carryroom.com/.well-known/api-catalog) (RFC 9727), [agent skills](https://www.carryroom.com/.well-known/agent-skills/index.json), [AI catalog](https://www.carryroom.com/.well-known/ai-catalog.json). - Any page as Markdown: send `Accept: text/markdown`. - [/api/v1](https://www.carryroom.com/api/v1): live. - [/api/v1/latest](https://www.carryroom.com/api/v1/latest): live. - [/api/v1/venues](https://www.carryroom.com/api/v1/venues): live. - [/api/v1/carry](https://www.carryroom.com/api/v1/carry): live. - [/api/v1/events](https://www.carryroom.com/api/v1/events): live. - [/api/v1/history](https://www.carryroom.com/api/v1/history): NOT BUILT YET — answers 501 with a notice, never an empty list. - [/api/v1/events/stream](https://www.carryroom.com/api/v1/events/stream): live — Server-Sent Events; pushes each new event as it is found. ## Agent skill - [SKILL.md](https://www.carryroom.com/skills/carryroom/SKILL.md): how to read these numbers without getting the sign or the interval wrong. Written for Claude Code, Codex and Gemini CLI; plain Markdown, so any agent can read it. - [skill manifest](https://www.carryroom.com/skills/carryroom.json): the file list, with a version that is the hash of the contents. ## What this site does not have - Rate history: not in this release. `/api/v1/history` says so with a 501 rather than returning an empty list. - Order placement, accounts, API keys: none. This site connects to no exchange account.