ARB

Arb Desk

Platforms included and why

Only venues that are legal and open to New York City residents are used for trades. Availability and fees were checked in September 2026. Both change, so recheck anything before relying on it. No sports contracts are scanned.

Trading venues

PlatformStatus for NYCUsed forFees the math includes
KalshiIncluded. CFTC-regulated exchange; non-sports markets open to NY residents.Every Stage 1 trade (brackets, ladders, NO sets)Taker fee 0.07 × C × P × (1−P) × series multiplier, rounded up to $0.0001 (schedule effective Jul 7 2026). No settlement fee. ACH deposits and withdrawals free; debit card deposits up to 2% (not included; use ACH).
CoinbaseIncluded. Licensed in New York (BitLicense).Crypto spot reference now; cash-and-carry leg in Stage 3Advanced Trade lowest tier: 0.60% maker / 1.20% taker. Stage 3 will use the taker rate.
GeminiIncluded. New York-chartered trust company.Crypto spot reference; alternative spot venue in Stage 3Stage 3 will look up the current ActiveTrader schedule before using it.
RobinhoodIncluded. Stocks, ETFs, options and crypto open in NY. Prediction markets open in NY for crypto, economics and finance (sports removed).Option spreads for Kalshi-vs-options hedges (IBIT, ETHA, GLD, SLV, SPX, XSP, NDX)Options: $0 commission. Published schedule (Sep 17 2026) also lists $0.04/contract regulatory fee and $0.50/contract for index options ($0.35 with Gold). Counted as $0 at your request; each card also shows the profit with those fees. Event contracts: 10% × P × (1−P) commission, max 1¢, plus exchange fee up to 1¢.
KrakenExcluded for trading. Kraken has blocked New York residents since 2015.Price reference only (a third opinion on crypto spot)Never used in a trade.
Polymarket US (polymarket.us)Included. A CFTC-regulated Designated Contract Market operated by QCX LLC — a separate legal entity from offshore Polymarket, not geoblocked in NY.Kalshi-vs-Polymarket US ladder comparisons (BTC/ETH year-end price brackets)Taker fee 0.0695 × C × P × (1−P) (maker gets a −0.0125 rebate); this dashboard always assumes taking. Reused via Kalshi's own fee formula with an equivalent multiplier.
Polymarket (offshore, polymarket.com)Excluded. Blocks US users. Not the same company as Polymarket US.Nothing—
Offshore crypto exchanges (Binance.com, Bybit, OKX…)Excluded. Not licensed for US/NY.Nothing—
Coinbase Derivatives (US futures)To be verified in Stage 3 for NY access and free data.Short futures leg for cash-and-carryIf NY access or free data can't be confirmed, the module will show as unavailable.

Data sources (all free, no API keys)

SourceWhatDelay
Kalshi public APIAll open events, markets, order books, fee multipliersLive at scan time; scans run every ~10 min (GitHub can run late)
Coinbase Exchange, Gemini, Kraken public tickersBTC, ETH, SOL, XRP, DOGE bid/askLive; also refreshed from your browser
gold-api.comGold, silver, platinum spotNear live (about 1 min); indicative, not a tradable quote
CBOE delayed option quotesFull option chains for IBIT, ETHA, GLD, SLV, SPX, XSP, NDXAbout 15 min delayed during market hours; frozen at the last close otherwise
Polymarket US public API (gateway.polymarket.us)BTC/ETH year-end bracket markets and order booksLive at scan time; no key needed
Coinbase historical minute candlesBitcoin/Ethereum price at the moment the ETF price was set, for the ETF ratioExact minute
U.S. Treasury daily bill rates (FRED DTB3 backup)13-week T-bill yield for the cash hurdlePublished each business day; up to a day old

Sources checked