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What is DepthFeed?
DepthFeed focuses on the depth available at a point in time, including resting sizes beyond the best bid and ask. Its REST API combines recurring crypto contracts with sports data and external price bars. Plans mainly change history, throughput and streaming capacity rather than hiding venues behind separate add-ons.
Who it is for
- Researchers estimating fills and slippage from historical depth
- Developers aligning crypto or equity prices with prediction markets
- Sports applications joining contract books and game data
Features and coverage
- Available on
- REST API, WebSocket, MCP
- Markets & venues
- Polymarket, Kalshi, Limitless
- Research topics
- Crypto, Sports, Equities
- Full book ladders
Read recorded bids, asks and resting quantities.
- Market discovery
Find supported recurring crypto contracts and retain outcome-token IDs.
- Historical replay data
Query snapshots; Desk also includes tick-level book changes.
- Aligned price bars
Retrieve one-minute-base equity, ETF, spot-crypto and perpetual OHLCV series.
- Sports mapping
Use contract mapping, books, sportsbook odds, scores and injuries through sports REST routes.
- Incremental refresh
Follow cursors and updated_since for changing market metadata.
- Account inspection
The whoami endpoint returns the key’s actual limits and history window.
Workflows with DepthFeed
Estimate a historical fill
Select the contract and timestamp, fetch both book sides and consume levels up to the proposed size. Compare this with a midpoint-only estimate.
Build a sports comparison
Discover the game’s contracts, require matched mapping status and check their settlement definitions. Join books and game state on stable identifiers.
Maintain an archive extract
Keep filters fixed while paginating, upsert stable IDs and retain explicit null corrections.
Pricing and total cost
All plans include every supported venue and the sports REST surface. Upgrades expand history and capacity.
Explorer
Free
- 7 days of history
- Full ladders with a key
- 1 request/second
Quant
$29/month
- 30 days of history
- 25 requests/second
- 1 concurrent live sports book
Research
$99/month
- 90 days of history
- 50 requests/second
- 2 concurrent live sports books
Desk
$249/month
- Full available archive
- 100 requests/second
- Tick data
- 3 concurrent live sports books
Getting started
Before you start: The keyless demo trims depth to eight levels per side; authenticated plans return full ladders.
- Try the keyless demo for a small BTC sample.
- Create an account and API key.
- Read /v3/whoami to inspect limits.
- Discover the market and request a bounded historical interval.
- Walk opaque cursors until has_more is false.
- Handle historical-workload controls separately from general request limits.
Useful links
What to check
- The keyless demo trims depth to eight levels per side; authenticated plans return full ladders.
- Ticks are Desk-only.
- An advertised history window does not extend a series before its first recorded observation.
- A matching label or cross-venue key alone does not establish equivalent settlement.
- General requests-per-second and parallel archive queries have separate limits.
A closer look
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Frequently asked questions about DepthFeed
Do I pay extra to add Kalshi?
The documented plans do not have separate Polymarket or Kalshi add-ons.
Can the free key access full books?
Yes. The eight-level trim applies to the anonymous demo.
Which plan includes every book change?
Tick routes require Desk.
How do I confirm my actual access?
Read /v3/whoami rather than inferring it from an example response.