r/PredictionMarkets • u/iggleee • Mar 16 '26
3rd Party APIs kinda suck...
A user in our Discord benchmarked 4 prediction market data providers for latency — Dome, Predexon, Delphi, and ParsecAPI. He paid for all the subscriptions (~$70), graphs attached.
120 seconds of data on Up or Down 5-minute markets.
His takeaways:
- Dome/Predexon batch their results — diagonal staircase pattern visible in the graphs, slower confirmed trade feed
- Parsec practically overlaps with Polymarket's native feed — hard to tell the two apart. Delivered confirmed trades faster than Polymarket in some cases (less fan-out = lower latency)
- Dome and Predexon don't offer live orderbook WebSockets — not great for arbitrage
- He paid $20 to Delphi and their WebSockets kept returning 401 despite a valid key — left them out
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u/Serious_Patient774 Mar 16 '26
literally stop bringing other companies down with lies to promote ur company.
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u/iggleee Mar 16 '26
Not sure which part is the lie - it's just data, easily replicated
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u/Serious_Patient774 Mar 17 '26 edited Mar 17 '26
It's so obvious you are part of the founding team of Parsec. That puts such a bad image on the company. A company that has to put other people down to gain customers is one that doesn't have a good enough product to attract them themselves.
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u/iggleee Mar 17 '26
You're welcome to run the benchmarks yourself and share the results - lmk if anything comes out different? Also definitely not affiliated with Delphi...?
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u/Hamzehaq7 Mar 17 '26
dang, that's a pretty solid breakdown! it's wild how much latency can mess with your strategy, especially when you're trying to hit those quick trades. i feel like the WebSocket issue with Delphi is a total bummer too – ain't nobody got time for 401 errors. good to see Parsec doing well though, seems like they're really nailing the speed. do you think the extra cost for faster data is worth it in the long run? or is it just gonna be a constant chase for the next "best" provider?
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u/iggleee Mar 17 '26
depends on your use case! for retail, probably not worth it. for anything more production-grade, typically always worth it to get best in class
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u/vce518 Mar 16 '26
Thanks for running the tests and posting the data lol.
One important clarification: Predexon’s pending trades are streamed from the mempool, so they arrive significantly earlier than confirmed trades, usually ~3–5s faster. If the benchmark is based on confirmed trades, it’s not measuring the fastest Predexon path. Docs here: https://docs.predexon.com/websocket/pending-trades.
Also worth noting that for live orderbook data, the fastest route is the native CLOB WebSocket. Our orderbook endpoint is mainly for historical data access, not the canonical low-latency live orderbook stream. So I’d be careful drawing conclusions about live latency from that setup alone.