AfterFees

AfterFees MCP server

Crypto funding-rate arbitrage for AI assistants, with every number net of fees and order-book slippage.

AfterFees prices ~75,000 long/short pairs across 50 exchanges (CEX, perp DEXs, Hyperliquid HIP-3) and tells you what a trade would actually earn at your size: funding minus taker fees on all four fills, slippage walked on the live order books, borrow interest, stablecoin conversion and holding period. Most screeners show the gross rate spread; once costs and real order-book depth are counted, often only a handful of the tens of thousands of pairs can be opened at $10,000 per side. This server gives your assistant the same numbers as afterfees.xyz.

• Hosted, nothing to install. Streamable HTTP at https://afterfees.xyz/mcp.
• Read-only. 27 tools; none can place an order or move funds.
• No token needed to try it. The anonymous tier answers with exactly what an anonymous visitor of the site sees ($10,000 per side, held 7 days), 60 requests per minute per IP address.
• Neutral. No exchange referral links or listing fees; rankings are not influenced by any exchange.

Connect

Claude (desktop or claude.ai): Settings → Connectors → Add custom connector → URL https://afterfees.xyz/mcp

Claude Code:

claude mcp add --transport http afterfees https://afterfees.xyz/mcp

Cursor (~/.cursor/mcp.json):

{ "mcpServers": { "afterfees": { "url": "https://afterfees.xyz/mcp" } } }

VS Code (.vscode/mcp.json):

{ "servers": { "afterfees": { "type": "http", "url": "https://afterfees.xyz/mcp" } } }

With a Pro token (your own size and holding period, every tool, Pro limits), add the header Authorization: Bearer <your token> — for example claude mcp add --transport http afterfees https://afterfees.xyz/mcp --header "Authorization: Bearer arb_...". Tokens are created on afterfees.xyz/developers.

Try asking

• "Which funding-rate arbitrage trades are actually profitable right now after fees and slippage?"
• "Compare BTC funding on every exchange and tell me the best long/short pair at $50k."
• "Break down the costs of the top pair: fees, slippage on each leg, breakeven time."
• "How did AfterFees' daily picks do last week — predicted vs realised?"
• "What does it cost to enter $100k on Hyperliquid vs Binance?"
• "Can I lock a fixed funding rate on Pendle Boros for ETH, and what does it net?"

Tools

Tool	What it returns
best_opportunities	Ranked long/short pairs with the net after fees and slippage at the stated size, tier and reasons
coin_overview	One coin's funding on every exchange plus its best pairs
pair_breakdown	Every number of one pair: funding per leg, fees, order-book VWAP and slippage, breakeven (Pro token)
funding_rates	Current perpetual funding rates (gross) by coin or exchange
borrow_rates	Margin borrow rates, limits and inventory (for spot-short legs)
fixed_vs_floating	Pendle Boros: fixed funding you can lock, net of fees, vs the floating benchmark
execution_cost	Taker fee + order-book slippage for a USD size of one coin on every exchange
basis_trades	Spot or perp against a dated future held to delivery
transfer_routes	Buy on one exchange, withdraw on a shared network, sell on another
pair_history	Funding actually settled on both legs over 7–365 days at your size
term_structure	Annualised basis of every delivery future of one coin
venue_execution_cost	$10k / $100k / $1M entry cost on one exchange
service_status	Whether data is live, which feeds are down, availability
order_checklist	The two orders to place by hand for one pair, in each exchange's own units
holding_scenarios	One pair's net held 8 h to 30 days
manual_calculator	Net, APR and breakeven for legs you describe
boros_lock_calculator	Locked net on Boros at an implied APR you give
transfer_calculator	Cross-exchange transfer net at prices you give
boros_market	One Boros market in detail
boros_futures_basis	Boros implied APR vs futures basis of the same maturity
exchanges	Every exchange covered: fully calculated or watch-only, fees, status
exchange_overview	One exchange: fees and sources, intervals, OI, extremes
coins	Coins listed on two or more exchanges
track_record	The daily top picks: predicted net vs net realised from settled funding
dex_scan	CEX ↔ DEX price gaps on verified contracts (Pro token)
spread_chart	Price spread candles between two instruments
my_positions	Your hedged positions across connected read-only keys (Pro token)

Every net figure says how its slippage was counted (net_basis): exact = walked on the live order books, reference = top of book only, before_slippage = no book. The method behind every number is published at afterfees.xyz/methodology.

About

AfterFees is built by Origin Trade Labs. Estimates from current data, not investment advice; we never hold funds or trade for you. Questions and feedback: the Feedback button on afterfees.xyz.

This repository holds the server's listing (this README and server.json for the MCP Registry); the server itself is hosted.