Best Free Polymarket Data

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. Official Polymarket APIs — for the most complete genuinely free option: live prices, books, and streaming, rate-limited, no card.
• 2. PolyOrderbooks — for 250ms L2, price, and metric history at $0 — 3 days of history on Starter, the same resolution as paid plans.
• 3. Predexon — for unlimited historical trades, order books, and pricing on the Free plan — a real historical pipeline at 0.
• 4. PolymarketData — for a free $0/month tier with very broad market discovery and 1-minute L2.
• 5. DepthFeed — for an Explorer plan with a free 7-day BTC sample and 1 request/second.
• 6. Telonex — for free metadata browsing and 5 trial file downloads.
• 7. PolyBackTest — for a free tier to test its BTC/ETH Up/Down snapshots API before subscribing.
• 8. PolyTest — for a 3-day trial on Builder, without a permanent free tier.

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.

The free tier landscape is a trap for a reason: providers price the history that is expensive to keep, and give away the state that is cheap to serve. Read the free rows in the matrix — the difference between a 250ms L2 Starter, an unlimited historical endpoint, a 7-day sample, and a 3-day trial is larger than the word "free" suggests.

Free tier verdicts should stay honest: the official API covers live prices and latest trades, small-market snapshots work fine, and a free tier with a limited historical window is good for learning. The ranking above says so out loud rather than forcing a paid pick.

The realistic free pipeline is official discovery plus the official live stream for today, with the archive free tier as the history window for anything older. That covers charts, notifications, and the first few backtests without a card on file.

The moment the free tier pinches is the reprice replay: past windows at full cadence are exactly what free limits restrict, so a beginner should treat the paid history tier as the upgrade path rather than a blocker.

The free-tier test that respects the venue is the one-contract replay: official live data plus one archived hour at full cadence should let a beginner reproduce a reprice second before deciding whether to pay for the deep history tier.

List the three reads you actually do — price, book snapshot, modest history — and confirm each on the free tier before choosing anything paid.

Use free windows for one full replay of a settled contract before paying; that single exercise tells you the cadence your work really needs.

Keep the official API as the always-free fallback; no list should start a beginner anywhere else.

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