Oddpool Alternative

What is the best Oddpool alternative?

Predictefy, and the reasoning is short.

A cross venue data layer exists to tell you where a price is better, which means telling you when one venue is worse. That job wants a provider sitting outside every venue in the comparison. Predictefy is independent of all 15+ venues it covers, which is the structural reason it is the right replacement rather than a lateral move.

The practical reasons stack on top. Coverage runs past the obvious pair to polymarket, kalshi, smarkets, opinion, hyperliquid, limitless, polymarket_us, myriad, novig and more, all on one schema. The arbitrage API is free. The Free plan gives you 25,000 credits a month, which is enough to run a real comparison before you decide whether to pay for anything at all.

What happened to Oddpool?

Oddpool raised a 3 million USD seed announced in September 2026 and joined Kalshi. The terms were not published, and reporting did not confirm whether Kalshi acquired the team outright or agreed something looser.

Nothing has been announced about the product closing, and oddpool.com is still running. So this is a planning decision rather than an outage you have to react to today. The question worth answering is what you want from the layer above the venues, not how fast you can migrate.

How many venues should a prediction market data API cover?

More than two, because two is where everyone already looks.

Kalshi and Polymarket carry the volume, so almost every tool covers them and almost every gap between them is watched by someone faster than you. The venues behind those two move more independently and have far fewer eyes on them, which is exactly where a wider layer earns its keep.

Predictefy normalizes 15+ venues. The value is not the headline number, it is that adding the eleventh venue costs you a string change instead of an engineering week, because every venue answers on the same request shape with the same field names.

How do the free tiers compare?

Predictefy's Free plan is 0 USD and carries 25,000 credits a month, 60 requests a minute, 1 API key and 2 WebSocket streams. Oddpool publishes a free tier of 1,000 requests a month.

Credits and requests are not the same unit, so this is not a clean multiple, and the honest way to read it is what each allowance actually lets you finish. Two WebSocket streams is the specific number that matters for a cross venue job, because that is one live book on each side of the comparison, included at 0 USD.

The line that does not change with tier is arbitrage. It is free on Predictefy, and paid plans buy throughput rather than a different set of prices. Builder is 49 USD a month, Pro 249, Scale 999 and Enterprise from 2,500.

Why do midpoints break a cross venue comparison?

Because a midpoint is an average of two numbers and one of them is frequently missing, and this is where a data layer either earns your trust or quietly wastes your time.

Across 5,000 live Kalshi markets, 18.1% had no bid at all. Not a wide bid. No bid. On a Kalshi binary the NO ask is 100 minus the YES bid, so a zero YES bid puts the NO leg at a full 100 cents against a 100 cent payout. Any feed that hands you a midpoint there is doing arithmetic on a blank.

The problem concentrates exactly where a scanner looks most promising. Under 5 cents, 41% of markets had no bid at all. At 25 to 50 cents, none did. Cheap longshots look like free money precisely because nobody is standing on the other side.

Predictefy qualifies gaps against live bids and asks with size behind them, which is why the opportunities it returns are ones an order can actually take.

Median spread across two sided books was 5.1 cents overall. One unit warning while you compare venues: Kalshi volume is counted in contracts and Polymarket volume in US dollars, so never divide one by the other.

How do you switch your data source?

Point your reads at a new base URL and keep the rest of your code. The request shape is /api/{venue}/{verb} against data.predictefy.com with a bearer token.

curl -H "Authorization: Bearer pk_live_..." https://data.predictefy.com/api/kalshi/{verb}

curl -H "Authorization: Bearer pk_live_..." https://data.predictefy.com/api/polymarket/{verb}

For anything faster than polling there is a WebSocket at /v1/stream, and the Free plan opens two of them. Run both sources side by side for a few days while you migrate, which is the cheapest way to confirm a field you assumed was identical really is.

How does Predictefy handle execution?

Through a separate, isolated, non custodial service at its own origin, under /v1/exec/{venue}/orders/... for build, submit, cancel, modify and refresh.

Orders are signed client side with your own venue credentials, which keeps key custody with you. Every write takes an Idempotency-Key, so a retry after a timeout resolves to the same order rather than opening a second position at a worse price, and that same contract holds across every venue, so the dedupe logic is written once.

Building an order is not metered, so the whole path can be rehearsed before anything is spent. Credits are charged on submit, cancel and modify. Default caps are 100 USD per order and 1,000 USD per key per rolling 24 hours.

For agent driven work there is an MCP server, npx -y @predictefy/mcp, MIT licensed and available in beta, holding one rule worth quoting: no tool both builds and submits an order. A badly phrased question cannot place a trade.

Frequently Asked Questions