Best Polymarket Data Providers

The ranking rewards whoever does the specific job best, not whoever has the most features. The full matrix that underpins it covers 10 providers across historical prices, historical L2, resolution, free tiers, and bulk export. Facts below were verified against public pricing and docs pages on September 24, 2026, and recorded in our provider matrix.

• 1. PolyOrderbooks — as the provider whose entire surface is Polymarket depth: 250ms books, prices, and metrics, with paid windows to 30–120 days and resolved markets that stay queryable.
• 2. Official Polymarket APIs — when the question is current — prices, books, streaming, and discovery are free and authoritative.
• 3. PolymarketData — when breadth wins: 1M+ unique markets and a 1-minute historical API on public tiers.
• 4. Telonex — when the workflow is research-grade Parquet: tick-level trades and book snapshots across exchanges.
• 5. Predexon — when the job spans venues plus entity-level analytics: Polymarket, Kalshi, Limitless, and more.
• 6. DepthFeed — when live feeds and full books across prediction markets matter on a paid plan.
• 7. PolyTest — for Up/Down backtesting with a documented snapshot model at 8 levels of depth.
• 8. Dune Analytics (Dune API) — when the answer should live in SQL over on-chain events and dashboards.

Measured coverage is the part a marketing page cannot answer. Our archive captures order books every 250ms and serves every plan, including free Starter, at that same 250ms query resolution. Competitors in the matrix cap documented L2 detail at 1-minute (PolymarketData), at 8 levels per snapshot (PolyTest), or rely on self-reported sub-second claims that conflict across their own pages (PolyTest, PolyBackTest). Resolution is not the only axis. Read the matrix row for interval-sampled versus event-driven capture (Telonex, DepthFeed), for on-chain-only limits that exclude the off-chain book entirely (Dune), and for archives that stop at coverage end or endpoint shutdown (polyReplay, Dome). Each listed product is the best answer for a specific job, and none is the best answer for every job.

Free tiers matter when the honest answer is the official API — which it usually is for live prices. Every provider in the matrix lists its free tier; where the free tier is only a sample or a trial, the row says so. If the job is historical depth, expect to pay for it, because depth history is the expensive thing to keep.

A typical evaluation runs the three canonical reads against every shortlist: current price, yesterday's books for one market, and a year of daily OHLC plus volume. Most providers pass the first, a minority pass the second, and the third collapses the list — which is why the ranking above leads with the ones that serve long 250ms archives.

The comparison that matters is not rows returned but frames preserved. A CSV that collapses an hour of books to one row destroys the one-second reprice study before it starts, so the evaluation should always include one event window with an actual band move.

Pricing reads differently per role: a hobbyist wants the free tier and the official API, a fund wants the raw book boundary and a research assistant wants citations point back to 250ms frames.

Providers that record frames rather than summaries also make the smallest honest dataset: one market, one event hour, one weekend of 250ms books is enough to test every claim in their docs against the venue's own archive.

Write the evaluation as three queries — now, last week, last year — and publish the row counts before reading any review.

Time the pull around a sponsored-hours window, because reprice activity is exactly when you will lean on the provider for real.

Keep the winning provider on a month-to-month contract until you have reproduced one study from its data end to end.

• Full provider matrix
• Order book data
• Price history
• Data download