This page is for traders and researchers evaluating tick-level prediction-market orderbook data, particularly for Polymarket and Kalshi backtests. Choose Telonex for a multi-venue subscription with daily-refreshed Parquet files across Polymarket, its perps market, and other chains. Choose ZenHodl for Kalshi tick-level depth and trade prints, capture-time game-state context on the Kalshi side, or a one-time archive you own outright.
At a Glance
| Attribute | ZenHodl | Telonex |
|---|---|---|
| Venues | Polymarket + Kalshi [1] | Polymarket, Polymarket Perps, Predict.fun (BNB Smart Chain), Binance Spot [2] |
| Tick-level data | Kalshi L2 depth (up to 20 levels/side) + deduped trade prints [3] | Tick-level trades/order books/quotes across its venues [2] |
| Kalshi support | Yes [1] | Not listed [2] |
| Game-state context | Kalshi-side rows in some archives carry capture-time game state (score/period/clock); not universal. Measured lag on the flagship tape: median 26s, p90 87s [3] | Not listed [2] |
| Pricing | One-time archives $9–$199; separate $49/mo+ API tier for live access [1] | Free trial (5 downloads); Single Exchange $99/mo; Pro (all exchanges) $199/mo; Enterprise custom [4] |
| Free tier | Free samples, no account required [5] | Free trial: 5 file downloads, no account needed [4] |
| Format | Parquet for paid archives; CSV samples [3] | Parquet, delivered as daily files via REST API [2] |
| Update cadence | Fixed dated-snapshot archive releases; separate $49/mo+ API tier for ongoing access [1] | Daily batch updates; no websocket/real-time streaming [2] |
| Time depth | Archive-specific; see individual listing | Polymarket up to 3+ years; other venues shorter (Perps since Jun 2026, Predict.fun since Apr 2026, Binance since Feb 2026) [2] |
When to Pick Telonex
- You want a simple REST API delivering daily-updated Parquet files, with no need for sub-daily freshness.
- You trade venues beyond Polymarket: Polymarket Perps, Predict.fun, or Binance spot.
- You want one recurring subscription covering multiple venues instead of separate one-time purchases.
- You only need short-term access and prefer a 5-download free trial before a $99/mo commitment.
- You do not currently need Kalshi coverage.
When to Pick ZenHodl
- You need Kalshi tick-level L2 depth and deduplicated trade prints.
- You want a one-time purchase you own outright and can backtest offline, with no recurring fee or API key.
- You want Parquet archives with a published, hash-verified manifest and documented known gaps.
- You are researching Polymarket and Kalshi together, understanding the two venues are captured on different windows/schedules and are not pre-joined.
- You need a fixed historical window rather than a continuously growing feed — for a live feed, ZenHodl's separate API tier is the option, not the archives.
The Key Differences
1. Kalshi coverage
ZenHodl includes Kalshi tick-level L2 depth (up to 20 levels per side) and deduplicated trade prints. Telonex's public materials list tick-level data for Polymarket, Polymarket Perps, Predict.fun, and Binance Spot, but do not list Kalshi support [2][3]. If your backtest depends on Kalshi markets, ZenHodl is the option that covers Kalshi here.
Worth knowing before buying: ZenHodl's Kalshi depth capture records the top-150 open Kalshi markets by 24-hour volume across all sports on each poll cycle, not a full market census — low-volume markets and quiet hours are under-represented by construction. Measured median polling cadence is roughly 31 seconds through 2026-07-11 and 42–47 seconds from 2026-07-12 [3].
2. Pricing model: one-time purchase vs recurring subscription
Telonex is a subscription: $99/mo for a single exchange or $199/mo for all exchanges, with a 5-download free trial [4]. That can be the lower-commitment choice if you only need one month of data or want to test before paying. ZenHodl's data archives are one-time purchases from $9 to $199, plus a separate $49/mo+ subscription for live, ongoing fair-value API access [1]. Over several months of continuous use a one-time archive can be cheaper than a recurring subscription — but a ZenHodl archive is a fixed historical window, not an ongoing feed, so it does not stay current the way Telonex's subscription does.
3. Game-state context and ownership model
Some of ZenHodl's Kalshi-side archives attach capture-time game state to Kalshi rows only — this is not published for Polymarket rows in the cross-venue archive, and it is not advertised for the flagship Kalshi Microstructure Tape by default. Where present, it is capture-time context, not a verified event-time timestamp: on the flagship tape, measured print-to-capture lag is a median of 26 seconds but a p99 of roughly 53 minutes [3]. Telonex's public materials describe daily-batch Parquet delivery via REST API; no websocket/real-time option or score/clock fields are listed [2]. ZenHodl's one-time archive model means you download and own the file and can backtest offline with no API key. Telonex provides recurring downloads while the subscription is active.
Free Sample & Next Steps
Download a free ZenHodl sample to inspect the schema: zenhodl.net/samples. Browse the full catalog: zenhodl.net/products. ZenHodl also publishes a free, DOI-minted MLB matched-book sample on Zenodo, linked from the samples page [6].
Documentation & Verification
Every ZenHodl archive ships with a hash-verified manifest (SHA-256 per file), a schema document, and a coverage/limitations note describing exact row counts, capture windows, and known gaps — see the individual product page for current documents [1].
Sources (checked 2026-09-25)
- zenhodl.net/products — ZenHodl archive catalog and pricing
- telonex.io — competitor homepage: venues, time depth
- zenhodl.net/static/samples/kalshi_micro_tape_SCHEMA.txt — Kalshi depth schema, coverage disclosure, cadence and lag figures
- telonex.io/pricing — competitor plan tiers (re-fetched 2026-09-25; Free trial $0, Single Exchange $99/mo, Pro $199/mo, Enterprise custom, confirmed unchanged)
- zenhodl.net/samples — ZenHodl free sample catalog
- doi.org/10.5281/zenodo.20816908 — Zenodo record for the free MLB matched-book sample