A Free JSON API for Kalshi Bitcoin 15-Minute Markets

Endpoints

Base URL https://degenhedge.com. Every JSON response sends Access-Control-Allow-Origin: *, so a browser page can call it directly. Over the limit you get HTTP 429 with a JSON body; wait a minute.

The current window: /api/btc-window

curl -s https://degenhedge.com/api/btc-window

Fields include ticker, open_time, close_time, strike (Kalshi's floor strike: the 60-second CF Benchmarks BRTI average before the window opened), yes_ask_cents (Up) and no_ask_cents (Down), fee (Kalshi's live fee type and multiplier for KXBTC15M) and kalshi_url. When Kalshi's data cannot be read, available is false. An ask is the cheapest offer at that moment and can move before you trade. It is the same snapshot the live window page shows.

The graded record: /api/record

curl -s https://degenhedge.com/api/record

Right now the record is 91.2% across 11,851 graded alerts at a 91.7¢ average entry. A contract bought at that price has to win that often just to return the stake, so the record sits below breakeven before Kalshi's fee and further below after it.

That is why the endpoint never returns a win rate on its own: overall and every row of by_entry_price carry avg_entry_cents, breakeven_before_fees_pct, breakeven_after_1contract_fee_pct and win_rate_minus_breakeven_before_fees_pts (negative means below breakeven), plus a one-sentence summary. Please quote them together.

What counts: every alert sent to subscribers with a usable 1 to 99 cent entry, graded against Kalshi's official result, losses included. Rows with a price-capture error, a 100-cent entry or that were never sent are shown in results.csv as EXCLUDED and counted in excluded_rows_disclosed_in_csv, never dropped. The figures are computed from the same CSV the results page uses and are checked against the site's live totals (ties_out_with_stats). Buckets match the fees and breakeven study.

Kalshi's fee: /api/kalshi-fee

curl -s "https://degenhedge.com/api/kalshi-fee?price=95&contracts=10"

{
 "input": {
  "price_cents": 95.0,
  "contracts": 10,
  "order": "taker"
 },
 "fee_cents": 4,
 "fee_per_contract_cents": 0.4,
 "total_cost_cents": 954.0,
 "profit_if_win_cents": 46.0,
 "loss_if_lose_cents": 954.0,
 "breakeven_win_rate_pct": 95.4,
 "breakeven_before_fees_pct": 95.0,
 "wins_needed_per_loss": 20.7391,
 "entry_price_bucket": "95c",
 "notes": [],
 "...": "..."
}

Kalshi's taker fee is 0.07 × contracts × P × (1 − P), with P in dollars, computed to a millionth of a dollar (rounded up) and then rounded up to the next whole cent for the order. Ten contracts at 95¢ therefore pay 4¢ in total, and the win rate needed to break even rises from 95% to 95.4%. price is in cents (95 means 95¢); between 10¢ and 90¢ it is rounded to a whole cent, as Kalshi quotes it. KXBTC15M charges no maker fee, and the endpoint re-checks Kalshi's series record and warns in notes if that changes. The arithmetic is identical to the fee calculator, down to the rounding.

Remote MCP server

The same three reads are available to AI agents as a remote Model Context Protocol server.

Any client that accepts a remote MCP server URL (for example a custom connector) can add https://degenhedge.com/mcp; no key or sign-in is needed. A quick check from a terminal:

npx @modelcontextprotocol/inspector --cli https://degenhedge.com/mcp --transport http --method tools/list

Every tool result carries the same disclaimer as the JSON endpoints, and the record tool always returns the win rate together with its average entry price and breakeven.

Terms, in plain words

• Free and read-only. No key, no account, nothing to sign. The endpoints only read; none of them can place a trade, see an account or change anything.
• No personal data. Nothing you send is stored, and nothing returned is about a person: no subscriber, email or Telegram data is reachable from these endpoints.
• Attribution. If you quote the record, cite DegenHedge and link degenhedge.com/results/. The research data is also on Hugging Face under CC BY 4.0.
• No guarantees. Best effort, no uptime promise, and fields may be added. Market data comes from Kalshi's public API and can lag Kalshi's own screen by a few seconds. See the Terms.
• Not advice. Informational and entertainment use only. Nothing here is financial, investment or betting advice, and a win rate is not a return.

The paid feed, if you want it

There is also a paid BTC 15-minute live feed on Telegram: our model's read beside the live Kalshi price, about two minutes before each window closes, on most windows, every call graded in public. It is sold as coverage and speed, not as a price advantage, because the record above sits below breakeven. Free for 30 days, then $4.99/mo →

This is a free trial that becomes an automatically renewing subscription. A payment card is required to start, and you are not charged today. Your trial runs 30 days. At the end of it your card is charged $4.99 and then $4.99 every month until you cancel. Cancel any time before the trial ends and you pay nothing: use your account page, send /manage in the bot, or email [email protected]. Cancelling later stops future renewals at the end of the current paid month and does not refund it. No refunds except as required by law. Signals are informational and for entertainment only, are not financial or betting advice, and any single signal can lose 100% of your stake. Must be 18+ (some platforms require 21+). If gambling is a problem for you, call 1-800-GAMBLER.