Head to head
Every other page here narrows a field. These start from a field already narrowed — two or three named products a reader is stuck between — and go deep on the differences a category listing cannot show.
CrossOdds vs ArbBets: one checks that it is the same question, the other how many contracts the gap holds for
Two paid Kalshi–Polymarket gap scanners, each doing the half the other skips — and the API that costs 20 USD on one costs 299 on the other.
Next to Analytics2 productsUpdated
Adjacent vs DepthFeed vs Predexon: what a cross-venue data API sells that the venues give away
Every venue publishes a free API. Three aggregators, three honest reasons to pay one anyway, and which free tier runs out first, in comparable units.
Next to Data APIs3 productsUpdated
Kairos vs Parity: one terminal charges per fill, the other has a fee written down and switched off
Both route orders to Kalshi and Polymarket from one screen. Kairos charges 0.25 cents a contract; Parity's own terms price double that if its fee comes on.
Next to Clients & Bots2 productsUpdated
Metaculus vs Good Judgment Open vs Manifold: which score you are chasing
Three free platforms, three formulas — a log-based peer score, a relative Brier against one crowd, and profit in a currency that cannot leave the site.
Next to Forecasting3 productsUpdated
Kalshi direct or through Coinbase, Webull, Robinhood or PrizePicks
Four apps in front of one KalshiEX order book. The contract and its resolution are the same; the fee, markets, states, account and tax form are not.
Next to Venues5 productsUpdated
Kalshi vs Polymarket: who takes your order and who decides you won
Kalshi checks your ID, decides outcomes against a named source and pays dollars. Polymarket checks nobody, leaves it to an oracle and pays a stablecoin.
Next to Venues2 productsUpdated
Polymarket vs Limitless vs Myriad: who decides, and what the fee is a percentage of
Three offshore venues with three resolution authorities — a token-holder vote, a price feed, a team — and three fee units that do not mean the same thing.
Next to Venues3 productsUpdated
Opinion vs Predict.fun: two BNB Chain order books, one USDT, fees that cross at 71 cents
Both settle in the same Binance-Peg USDT contract. They differ on who resolves, which side of 71 cents is cheaper, the $0.25 floor, and the yield.
Next to Venues2 productsUpdated
py-clob-client vs polymarket-client vs PMXT vs CCXT: which Python client to write against Polymarket
One archived, one official, two multi-venue abstractions. Which to write against, what the abstraction removes, and where each one keeps your signing key.
Next to SDKs4 productsUpdated
Polymarket vs Polymarket US: one brand, two exchanges, no shared book
Two exchanges under one name, with no shared order book, custody, regulator, fee schedule or resolution. Where you live decides which one you may use.
Next to Venues2 productsUpdated
Convexly vs OrcaLayer vs Airavat vs Polysights vs Predicts.guru: who publishes the rule behind the label
Five readers of one public record. Two publish the exclusion rule, one publishes its own failed tests, and their market counts differ by a factor of thirteen.
Next to Wallet Trackers5 productsUpdated
DraftKings Predictions vs FanDuel Predicts vs Underdog Predict: three ownership shapes behind three sports logos
The same-looking apps put you in three different legal relationships, which set the fee curve, the rulebook, where your cash sits and which state map applies.
Next to Venues3 productsUpdated
Public vs moomoo vs tastytrade: Kalshi's contracts inside a stock brokerage
Three brokerages in front of one KalshiEX book, all on flat cents. What separates them is the market list, the account, the API, and a promotion.
Next to Venues3 productsUpdated
Kalshi vs Polymarket US vs Robinhood: one of these three is not an exchange
Robinhood is a broker routing to four exchanges, so the same contract costs more there. Kalshi and Polymarket US are two separate exchanges, not one brand.
Next to Venues3 productsUpdated