Dark pool data API: every block print, ranked against the stock's own year
By Faizan Ahmad. Updated .
The Tradytics dark pool data API serves every dark pool block print in US stocks and ETFs, each ranked against the stock's own last 12 months, and the price levels where the dark pool dollars concentrated.
The archive holds 24.4 million prints and 6.5 million blocks over 507 sessions since October 28, 2024, across 14,147 tickers. It comes with Pro at $69 a month, 300 calls a minute and 50,000 a day, on the same key as options flow, dealer exposure, Probabilities, Signals and the AI Fund's trades.
What the dark pool API returns
| Endpoint | What it returns |
|---|---|
GET /darkpool/prints | The latest session's prints, newest first, or a recent session with date; filter by symbol, dark pool or exchange block, and minimum value; since returns only prints after the id you hold |
GET /darkpool/history | One symbol's prints from the archive over any from and to range, with the same filters |
GET /symbols/{symbol}/darkpool/ranked | A stock's prints with their rank among its prints of the same kind over the last 12 months; kind trade, close or open, sort new or big |
GET /symbols/{symbol}/darkpool | Dark pool levels (the prices with the most dark pool money and their print counts) and 30 sessions of daily totals with the close |
Base URL https://tradytics.com/api/public/v1. Every request sends Authorization: Bearer YOUR_KEY. Keys are made on the API keys page.
A real response
NVDA's ranked prints, trimmed to two: the largest off-exchange print of its year, 51,868,883 shares at $227.635 on September 21, 2026 ($11.81 billion), and the largest closing-auction print, $17.31 billion on May 29, 2026. Each is rank 1 within its kind.
GET /symbols/NVDA/darkpool/ranked
{
"data": [
{"d": "2026-09-21", "t": 1790026930153, "pr": 227.635, "v": 51868883,
"p": 11807173181.705, "dark": 1, "k": "trade", "late": 1, "rank": 1},
{"d": "2026-05-29", "t": 1780084800471, "pr": 211.14, "v": 81985755,
"p": 17310472310.7, "dark": 0, "k": "close", "late": 0, "rank": 1}
]
}NVDA's dark pool levels on November 5, 2026, trimmed to three levels and one day:
GET /symbols/NVDA/darkpool
{
"data": {
"spot": 182.91,
"levels": [
{"price": 204.64, "value": 2367585187.22, "prints": 71},
{"price": 206.68, "value": 1613981070.28, "prints": 47},
{"price": 213.65, "value": 1438425696.1, "prints": 31}
],
"days": [
{"day": "2026-09-30", "value": 8056152497.49, "dark": 2808939062.01,
"prints": 70, "shares": 35265228.0, "close": 228.38}
]
}
}The fields
| Field | Meaning |
|---|---|
rank | The print's place among the stock's prints of the same kind over the last 12 months, by dollar value; 1 is the biggest of the year |
k | trade, or close and open for the closing and opening auctions |
dark | 1 off-exchange (dark pool), 0 an exchange block or auction |
late | 1 when the print carries a late-report flag (what a late print is) |
pr, v, p | Price, shares and dollars |
d, t | Session and print time in epoch milliseconds |
levels[] | A level's value-weighted price, its dark pool value in dollars and its prints |
days[] | Each session's block value, the off-exchange part in dark, prints, shares and the close |
venue, conditions | On /darkpool/prints: Dark pool or the exchange for a block, and the sale condition codes as reported |
Why the prints are ranked
A dollar figure alone does not say whether a print matters. $50 million is routine in SPY and can be the print of the year in a mid-cap. Tradytics ranks every block against the same stock's last 12 months, separately for off-exchange trades and the opening and closing auctions, so rank answers the question directly: is this big for this stock? The same prints build the dark pool levels, the prices where the dollars piled up, which show as a volume profile on the research page and as levels on the chart. More in ranked dark pool prints and what dark pool levels are.
How it joins the other datasets
Every dataset on the key uses the same symbols and New York sessions, so a top-ranked print lines up against everything else in that name:
- Options flow: did call or put orders build in the stock the same session?
- Dealer exposure: does a dark pool level sit near the call wall, put wall or gamma flip?
- The scanner: off-exchange block value against the stock's own 20-session average, across every US stock.
- Bars and quotes: what the stock did after the print.
The backtester reads the same dark pool prints since October 2024 when you test a rule in plain words.
From Claude, ChatGPT or Cursor
The Tradytics MCP server at https://tradytics.com/mcp gives agents dark pool prints and levels as tools among its 15, so you can ask "Where are MSFT's biggest dark pool levels?" and the assistant reads them itself. Connect it once with your Tradytics account; it uses your Pro limits. More in the Tradytics API and MCP server.
Limits and plan
| Tradytics Pro | |
|---|---|
| Price | $69 a month or $499 a year, with the full app included |
| Rate limits | 300 calls a minute, 50,000 a day |
| Dark pool history | 24.4 million prints and 6.5 million blocks since October 28, 2024, 14,147 tickers |
| Also on the key | Options flow since March 31, 2025, dealer gamma, delta, vanna and charm, the options market, Probabilities, Signals, AI Fund trades, the scanner, research and market data |
| MCP server | Included |
How it compares
Checked on each platform's own site, November 5, 2026.
| Platform | Market data APIs compared |
|---|---|
| Tradytics | In Pro, $69 a month with the full app: 300 calls a minute, 50,000 a day; options flow since March 2025, ranked dark pool, dealer exposure, Probabilities, Signals and AI Fund trades; MCP server |
| Unusual Whales | Separate: $99 a month (1-year lookback, 25,000 requests a month), $150 (2 years), $375 (WebSocket); MCP with 100+ tools; Polymarket only |
| Quant Data | $149.99 a month, 365+ days of history, 240 requests a minute; MCP |
| Bullflow | $129 a month or pay per request; flow, dealer gamma and dark pool; MCP |
| Quiver Quantitative | From $30 a month; alternative data, no options flow or dark pool prints; MCP |
| Barchart OnDemand | Usage-based pricing; option history and unusual activity; no MCP |
| Cheddar Flow, SpotGamma, OptionStrat, Market Chameleon, MenthorQ, TradeAlgo, InsiderFinance, BlackBoxStocks, Koyfin | No API |
Common questions
Is there a dark pool data API?
Yes. The Tradytics dark pool API returns every dark pool block print in US stocks and ETFs, ranked against each stock's last 12 months, plus dark pool levels and daily totals, in Pro for $69 a month with 50,000 calls a day.
How much dark pool history does the API have?
24.4 million prints and 6.5 million blocks over 507 sessions since October 28, 2024, across 14,147 tickers. GET /darkpool/history returns one symbol's prints over any date range in that span.
What does a dark pool print's rank mean?
Its place among the same stock's prints of that kind over the last 12 months, by dollar value. Rank 1 is the biggest off-exchange print, or the biggest closing or opening auction, the stock has had in a year.
Can I get dark pool levels from the API?
Yes. GET /symbols/{symbol}/darkpool returns the prices where the most dark pool money traded, with dollars and print counts, and 30 sessions of daily dark pool and exchange block totals with the close.
Can ChatGPT or Claude read dark pool data?
Yes, through the Tradytics MCP server at https://tradytics.com/mcp. Its dark pool tools return prints and levels to Claude, ChatGPT, Cursor and other agents on the same Pro plan.