thetadatadx 8.0.28

No-JVM ThetaData Terminal — native Rust SDK for direct market data access (Python bindings)

thetadatadx (Python)

Python bindings over the Rust core. Every call crosses the PyO3 boundary into Rust: gRPC communication, protobuf parsing, zstd decompression, FIT tick decoding, and TCP streaming run inside the thetadatadx crate.

FLATFILES coverage: the Python binding currently exposes the MDDS (historical) and FPSS (streaming) surfaces only. The third surface — FLATFILES whole-universe daily blobs — is shipped in the Rust core (v8.0.17+) and is being wired into Python under issue #435. See ROADMAP.md for the per-binding status.

Installation

pip install thetadatadx

# With pandas DataFrame support (Arrow-backed, zero-copy on pandas 2.x)
pip install thetadatadx[pandas]

# With polars DataFrame support
pip install thetadatadx[polars]

# Raw Arrow (pyarrow.Table for DuckDB / Arrow-Flight / cuDF / polars-arrow)
pip install thetadatadx[arrow]

# All optional adapters
pip install thetadatadx[all]

Or build from source (requires Rust toolchain):

pip install "maturin>=1.9.4,<2.0"
maturin develop --release

Binary wheels use CPython's stable ABI (abi3) with a minimum Python version of 3.9, so one wheel per platform supports Python 3.9+.

Quick Start

from thetadatadx import Credentials, Config, ThetaDataDx

# Authenticate and connect
creds = Credentials.from_file("creds.txt")
# Or inline: creds = Credentials("[e-mail]", "your-password")
tdx = ThetaDataDx(creds, Config.production())

# Fetch end-of-day data
eod = tdx.stock_history_eod("AAPL", "20240101", "20240301")
for tick in eod:
    print(f"{tick.date}: O={tick.open:.2f} H={tick.high:.2f} "
          f"L={tick.low:.2f} C={tick.close:.2f} V={tick.volume}")

# Intraday 1-minute OHLC bars (shorthand or milliseconds)
bars = tdx.stock_history_ohlc("AAPL", "20240315", "1m")
print(f"{len(bars)} bars")

# Option chain
exps = tdx.option_list_expirations("SPY")
strikes = tdx.option_list_strikes("SPY", exps[0])

Greeks Calculator

Full Black-Scholes calculator with 23 Greeks, running in Rust:

from thetadatadx import all_greeks, implied_volatility

# All Greeks at once
g = all_greeks(
    spot=450.0, strike=455.0, rate=0.05, div_yield=0.015,
    tte=30/365, option_price=8.50, right="C"
)
print(f"IV={g.iv:.4f} Delta={g.delta:.4f} Gamma={g.gamma:.6f}")

# Just IV
iv, err = implied_volatility(450.0, 455.0, 0.05, 0.015, 30/365, 8.50, "C")

API

Credentials

• Credentials(email, password) - direct construction
• Credentials.from_file(path) - load from creds.txt

Config

• Config.production() - ThetaData NJ production servers
• Config.dev() - Dev FPSS servers (port 20200, infinite historical replay)
• Config.stage() - Stage FPSS servers (port 20100, testing, unstable)

ThetaDataDx(creds, config)

Every historical endpoint is available. The tick-returning endpoints return typed <TickName>List wrappers (e.g. EodTickList, TradeTickList, QuoteTickList, ...), each implementing the Python sequence protocol (len(...), for tick in ..., lst[0], negative indexing) with typed-pyclass elements exposed via attribute access — tick.close, tick.price — with IDE completion and typo-loud AttributeError on misuse. Every wrapper also exposes the chainable DataFrame terminals covered in Chained DataFrame terminals. List-of-string endpoints (*_list_symbols, *_list_dates, option_list_expirations, option_list_strikes) return a StringList wrapper with the same chainable terminals; the single output column is named by the endpoint metadata (symbol, date, expiration, ...). option_list_contracts returns an OptionContractList; calendar_on_date / calendar_year return a CalendarDayList.

Stock Methods (14)

Method	Description
stock_list_symbols()	All stock symbols
stock_list_dates(request_type, symbol)	Available dates by request type
stock_snapshot_ohlc(symbols)	Latest OHLC snapshot
stock_snapshot_trade(symbols)	Latest trade snapshot
stock_snapshot_quote(symbols)	Latest NBBO quote snapshot
stock_snapshot_market_value(symbols)	Latest market value snapshot
stock_history_eod(symbol, start_date, end_date)	End-of-day data
stock_history_ohlc(symbol, date, interval)	Intraday OHLC bars. interval accepts ms ("60000") or shorthand ("1m").
stock_history_ohlc_range(symbol, start_date, end_date, interval)	OHLC bars across date range. interval accepts ms or shorthand.
stock_history_trade(symbol, date)	All trades for a date
stock_history_quote(symbol, date, interval)	NBBO quotes. interval accepts ms or shorthand.
stock_history_trade_quote(symbol, date)	Combined trade+quote ticks
stock_at_time_trade(symbol, start_date, end_date, time)	Trade at specific time across dates
stock_at_time_quote(symbol, start_date, end_date, time)	Quote at specific time across dates

Option Methods (34)

Method	Description
option_list_symbols()	Option underlying symbols
option_list_dates(request_type, symbol, expiration, strike, right)	Available dates for a contract
option_list_expirations(symbol)	Expiration dates
option_list_strikes(symbol, expiration)	Strike prices
option_list_contracts(request_type, symbol, date)	All contracts for a date
option_snapshot_ohlc(symbol, expiration, strike, right)	Latest OHLC snapshot
option_snapshot_trade(symbol, expiration, strike, right)	Latest trade snapshot
option_snapshot_quote(symbol, expiration, strike, right)	Latest quote snapshot
option_snapshot_open_interest(symbol, expiration, strike, right)	Latest open interest
option_snapshot_market_value(symbol, expiration, strike, right)	Latest market value
option_snapshot_greeks_implied_volatility(symbol, expiration, strike, right)	IV snapshot
option_snapshot_greeks_all(symbol, expiration, strike, right)	All Greeks snapshot
option_snapshot_greeks_first_order(symbol, expiration, strike, right)	First-order Greeks
option_snapshot_greeks_second_order(symbol, expiration, strike, right)	Second-order Greeks
option_snapshot_greeks_third_order(symbol, expiration, strike, right)	Third-order Greeks
option_history_eod(symbol, expiration, strike, right, start_date, end_date)	EOD option data
option_history_ohlc(symbol, expiration, strike, right, date, interval)	Intraday OHLC bars
option_history_trade(symbol, expiration, strike, right, date)	All trades
option_history_quote(symbol, expiration, strike, right, date, interval)	NBBO quotes
option_history_trade_quote(symbol, expiration, strike, right, date)	Combined trade+quote
option_history_open_interest(symbol, expiration, strike, right, date)	Open interest history
option_history_greeks_eod(symbol, expiration, strike, right, start_date, end_date, *, annual_dividend=None, rate_type=None, rate_value=None, version=None, underlyer_use_nbbo=None, max_dte=None, strike_range=None)	EOD Greeks
option_history_greeks_all(symbol, expiration, strike, right, date, interval)	All Greeks history
option_history_trade_greeks_all(symbol, expiration, strike, right, date)	Greeks on each trade
option_history_greeks_first_order(symbol, expiration, strike, right, date, interval)	First-order Greeks history
option_history_trade_greeks_first_order(symbol, expiration, strike, right, date)	First-order on each trade
option_history_greeks_second_order(symbol, expiration, strike, right, date, interval)	Second-order Greeks history
option_history_trade_greeks_second_order(symbol, expiration, strike, right, date)	Second-order on each trade
option_history_greeks_third_order(symbol, expiration, strike, right, date, interval)	Third-order Greeks history
option_history_trade_greeks_third_order(symbol, expiration, strike, right, date)	Third-order on each trade
option_history_greeks_implied_volatility(symbol, expiration, strike, right, date, interval)	IV history
option_history_trade_greeks_implied_volatility(symbol, expiration, strike, right, date)	IV on each trade
option_at_time_trade(symbol, expiration, strike, right, start_date, end_date, time)	Trade at specific time
option_at_time_quote(symbol, expiration, strike, right, start_date, end_date, time)	Quote at specific time

Index Methods (9)

Method	Description
index_list_symbols()	All index symbols
index_list_dates(symbol)	Available dates for an index
index_snapshot_ohlc(symbols)	Latest OHLC snapshot
index_snapshot_price(symbols)	Latest price snapshot
index_snapshot_market_value(symbols)	Latest market value snapshot
index_history_eod(symbol, start_date, end_date)	End-of-day index data
index_history_ohlc(symbol, start_date, end_date, interval)	Intraday OHLC bars
index_history_price(symbol, date, interval)	Intraday price history
index_at_time_price(symbol, start_date, end_date, time)	Price at specific time

Calendar Methods (3)

Method	Description
calendar_open_today()	Is the market open today?
calendar_on_date(date)	Calendar info for a date
calendar_year(year)	Calendar for an entire year

Rate Methods (1)

Method	Description
interest_rate_history_eod(symbol, start_date, end_date)	Interest rate EOD history

Streaming (via ThetaDataDx)

Real-time streaming is accessed through the same ThetaDataDx instance.

Per-contract subscriptions (stocks)

Method	Description
subscribe_quotes(symbol)	Subscribe to quote data for a stock
subscribe_trades(symbol)	Subscribe to trade data for a stock
subscribe_open_interest(symbol)	Subscribe to open interest data for a stock
unsubscribe_quotes(symbol)	Unsubscribe from quote data for a stock
unsubscribe_trades(symbol)	Unsubscribe from trade data for a stock
unsubscribe_open_interest(symbol)	Unsubscribe from open interest data for a stock

Per-contract subscriptions (options)

Method	Description
subscribe_option_quotes(symbol, expiration, strike, right)	Subscribe to option quote data. right: accepts "call", "put", "C", "P" (case-insensitive). strike: dollar string e.g. "550".
subscribe_option_trades(symbol, expiration, strike, right)	Subscribe to option trade data
subscribe_option_open_interest(symbol, expiration, strike, right)	Subscribe to option OI data
unsubscribe_option_quotes(symbol, expiration, strike, right)	Unsubscribe from option quotes
unsubscribe_option_trades(symbol, expiration, strike, right)	Unsubscribe from option trades
unsubscribe_option_open_interest(symbol, expiration, strike, right)	Unsubscribe from option OI

Full-type subscriptions

Method	Description
subscribe_full_trades(sec_type)	Subscribe to ALL trades for a security type ("STOCK", "OPTION", "INDEX")
subscribe_full_open_interest(sec_type)	Subscribe to ALL OI for a security type
unsubscribe_full_trades(sec_type)	Unsubscribe from ALL trades for a security type
unsubscribe_full_open_interest(sec_type)	Unsubscribe from ALL OI for a security type

Full trade stream behavior: When subscribed via subscribe_full_trades("OPTION"), the ThetaData FPSS server sends a bundle for every trade across ALL option contracts:

1. Pre-trade NBBO quote
2. OHLC bar for the traded contract
3. The trade itself
4. Two post-trade NBBO quotes

Events arrive as typed objects — Quote, Trade, Ohlcvc, OpenInterest for market data; Simple for control / diagnostic events (login_success, contract_assigned, disconnected, market_open/close, ...); RawData for unrecognized wire frames. Every variant carries a .kind discriminator matching the TypeScript SDK's FpssEvent.kind tag exactly ("quote", "trade", "ohlcvc", "open_interest", "simple", "raw_data"). Concrete control-event names ("login_success", "contract_assigned", ...) live on Simple.event_type — mirroring FpssSimplePayload.eventType on the TS side. Filter on event.kind to route, then read attributes directly:

tdx.start_streaming()
tdx.subscribe_full_trades("OPTION")

# Build a contract ID -> symbol map as assignments arrive
contracts = {}

while True:
    event = tdx.next_event(timeout_ms=100)
    if event is None:
        continue

    # Track contract assignments (control events go through `Simple`)
    if event.kind == "simple" and event.event_type == "contract_assigned":
        contracts[event.id] = event.detail
        continue

    contract = contracts.get(getattr(event, "contract_id", None), "unknown")

    # Filter by type - you choose what you want
    if event.kind == "trade":
        print(f"[{contract}] TRADE {event.price:.2f} x {event.size}")
    elif event.kind == "quote":
        print(f"[{contract}] QUOTE bid={event.bid:.2f} ask={event.ask:.2f}")
    # Skip ohlcvc if you don't need bars

tdx.stop_streaming()

You can also subscribe to per-contract streams if you only need specific symbols rather than the full firehose.

State & lifecycle

Method	Description
contract_map()	Get dict mapping contract IDs to string descriptions
contract_lookup(id)	Look up a single contract by ID (returns str or None)
active_subscriptions()	Get list of active subscriptions (list of dicts with "kind" and "contract")
next_event(timeout_ms=5000)	Poll for the next event (returns a typed Quote / Trade / Ohlcvc / OpenInterest / Simple / RawData pyclass, or None on timeout). event.kind carries the same discriminator tag as the TypeScript SDK's FpssEvent.kind.
next_event_typed(timeout_ms=5000)	Alias — same return type and shape as next_event.
reconnect()	Reconnect streaming and restore subscriptions
shutdown()	Graceful shutdown

Chained DataFrame terminals

Every historical endpoint returns a typed list wrapper (EodTickList, OhlcTickList, StringList, ...) whose terminals convert straight into columnar form:

Terminal	Returns	Extra
.to_list()	Plain list[TickClass]	—
.to_arrow()	pyarrow.Table	pip install thetadatadx[arrow]
.to_pandas()	pandas.DataFrame	pip install thetadatadx[pandas]
.to_polars()	polars.DataFrame	pip install thetadatadx[polars]

The .to_arrow() terminal hands the RecordBatch off to pyarrow via the Arrow C Data Interface — zero-copy at the pyo3 boundary, the underlying Arrow buffers are the same ones Rust just filled. .to_pandas() and .to_polars() chain through the Arrow table for the final dtype.

import duckdb
table = tdx.stock_history_eod("AAPL", "20240101", "20240301").to_arrow()
con = duckdb.connect()
con.register("eod", table)                  # zero-copy into DuckDB
con.sql("SELECT AVG(close) FROM eod").show()

The list wrapper itself behaves like a Python sequence:

eod = tdx.stock_history_eod("AAPL", "20240101", "20240301")

len(eod)                                   # row count
bool(eod)                                  # False when empty
eod[0]                                     # first EodTick
eod[-1]                                    # last row, negative indexing supported
for tick in eod:                           # iterate in decode order
    process(tick)

On empty results the wrapper still has __len__ == 0, bool(...) == False, and the .to_arrow() / .to_pandas() / .to_polars() terminals produce a zero-row frame with the full typed column schema — no hint= kwarg needed.

all_greeks(spot, strike, rate, div_yield, tte, option_price, right)

right accepts "C"/"P" or "call"/"put" case-insensitively. Returns AllGreeks pyclass with 22 attribute fields (g.iv, g.delta, g.gamma, ...). All fields are float (f64). Consult help(thetadatadx.AllGreeks) for the full list.

implied_volatility(spot, strike, rate, div_yield, tte, option_price, right)

right accepts "C"/"P" or "call"/"put" case-insensitively. Returns (iv, error) tuple.

Architecture

graph TD
    A["Python code"] - "PyO3 FFI" --> B["thetadatadx Rust crate"]
    B - "tonic gRPC / TLS TCP" --> C["ThetaData servers"]

No HTTP middleware, no Java terminal, no subprocess. Direct wire-protocol access from the Rust core.

FPSS Streaming

Real-time market data via ThetaData's FPSS servers:

from thetadatadx import Credentials, Config, ThetaDataDx

creds = Credentials.from_file("creds.txt")
# Or inline: creds = Credentials("[e-mail]", "your-password")
tdx = ThetaDataDx(creds, Config.production())

# Start streaming and subscribe to real-time data
tdx.start_streaming()
tdx.subscribe_quotes("AAPL")
tdx.subscribe_trades("SPY")

# Poll for events (typed pyclasses: `Quote`, `Trade`, `Ohlcvc`, ...)
while True:
    event = tdx.next_event(timeout_ms=5000)
    if event is None:
        break  # timeout, no event received
    if event.kind == "quote":
        print(f"Quote: contract_id={event.contract_id} bid={event.bid} ask={event.ask}")
    elif event.kind == "trade":
        print(f"Trade: contract_id={event.contract_id} price={event.price} size={event.size}")

tdx.stop_streaming()

DataFrame Conversion (Arrow-Backed)

Every DataFrame entry point goes through a single Arrow columnar pipeline: Rust Vec<Tick> -> arrow::RecordBatch -> pyarrow.Table via the Arrow C Data Interface (zero-copy) -> pandas / polars / raw Arrow. On pandas 2.x the numeric DataFrame columns alias the Arrow buffers in place.

from thetadatadx import Credentials, Config, ThetaDataDx

creds = Credentials.from_file("creds.txt")
tdx = ThetaDataDx(creds, Config.production())

# Pandas -- zero-copy numeric columns on pandas 2.x.
df  = tdx.stock_history_eod("AAPL", "20240101", "20240301").to_pandas()

# Polars via polars.from_arrow -- zero-copy at the Arrow boundary.
pdf = tdx.stock_history_eod("AAPL", "20240101", "20240301").to_polars()

# Raw Arrow -- plug straight into DuckDB / Arrow-Flight / cuDF.
tbl = tdx.stock_history_eod("AAPL", "20240101", "20240301").to_arrow()

# Same recipe for any tick-returning historical endpoint.
df  = tdx.stock_history_ohlc("AAPL", "20240315", "1m").to_pandas()
df  = tdx.option_history_trade("SPY", "20240620", "550", "C", "20240315").to_pandas()

List endpoints (stock_list_symbols, option_list_expirations, ...) return a StringList wrapper with the same chainable terminals; the DataFrame column header matches the semantic name:

symbols = tdx.stock_list_symbols().to_polars()          # `symbol` column
expirations = tdx.option_list_expirations("AAPL").to_pandas()

See the Arrow project docs for the C Data Interface (how the zero-copy handoff works) and pyarrow Table docs for consumer APIs.

Install with:

• pip install thetadatadx[pandas] — pandas + pyarrow
• pip install thetadatadx[polars] — polars + pyarrow
• pip install thetadatadx[arrow] — pyarrow only