msts-trader 0.3.3

Paste a target-weights CSV, preview the rebalance, execute it on your brokerage account. Tastytrade + Alpaca + IBKR + Schwab + paper.

msts-trader

Paste a target-weights CSV, preview the rebalance, execute it on your own brokerage account. Multi-broker, local-only, no key custody.

$ msts-trader
Paste CSV (ticker,weight), then Ctrl+D:
ticker,weight
SPY,0.42
GLD,0.18
SHV,0.20
EEM,0.20
^D
✓ loaded 4 targets.

tastytrade · account 5W******  ·  NAV $48,213.42  ·  cash $2,150.00  ·  BP $46,290.00
Market: open  ·  closes in 23 min

           Rebalance preview
┃ Symbol ┃ Current % ┃ Target % ┃   Δ $ ┃ Action                  ┃ Note ┃
┃ SPY    ┃    18.2%  ┃   42.0%  ┃ +$11k ┃ BUY  22.00 @ ~$521.34   ┃      ┃
┃ EEM    ┃    31.5%  ┃   20.0%  ┃  -$5k ┃ SELL 119.00 @ ~$47.21   ┃      ┃
...

Execute 4 orders on tastytrade? [y/N]: y
[1/4] SPY  BUY  22.00 @ MKT ...  ROUTED  id=4f8...

Done.  sent: 4  ·  failed: 0  ·  log: ~/.msts-trader/fills/

Supported brokers

Broker	Status	Auth	Notes
Paper	shipped, tested	local file	$100k starting cash, no real fills, 14 unit tests
Tastytrade	shipped, live-tested	OAuth refresh token	indefinite token, BYO OAuth app
Alpaca	shipped, beta	API key + secret	paper or live, fractional supported, awaiting live-fill confirmation
IBKR	shipped, beta	TWS / IB Gateway socket	pip install "msts-trader[ibkr]", works with local or Dockerised Gateway, awaiting live-fill confirmation
Schwab	shipped, beta	OAuth2 + browser callback	pip install "msts-trader[schwab]", 7-day refresh, awaiting live-fill confirmation

Beta status: Alpaca, IBKR, and Schwab adapters pass structural protocol conformance tests in CI (signatures, attributes, error handling) but have not yet been verified end-to-end against a real brokerage account by the author. Try them in paper mode first, or file an issue with a fill report if you run them live.

Open a GitHub issue if you want one prioritised.

Install

pip install msts-trader

Python ≥3.11 required.

Optional brokers

IBKR and Schwab require extra dependencies. Install them only if you plan to use that broker:

pip install "msts-trader[ibkr]"      # adds ib_insync + nest_asyncio
pip install "msts-trader[schwab]"    # adds schwab-py
pip install "msts-trader[all]"       # everything

Install from source:

git clone https://github.com/markudevelop/msts-trader.git
cd msts-trader
pip install -e ".[all]"

One-time setup

You provide your own broker credentials. They are stored in your OS keychain (macOS Keychain / Windows Credential Manager / libsecret on Linux) and never leave your machine.

Tastytrade

1. Sign in at https://developer.tastytrade.com → My Apps
2. Create an OAuth application — copy the provider secret
3. Run their OAuth authorization flow to obtain a refresh token
4. Look up your account number in the Tastytrade web dashboard (optional)
5. Run:

msts-trader login --broker tastytrade

Alpaca

1. Sign in at https://alpaca.markets (paper or live)
2. Account → API keys → generate a new pair
3. Run:

msts-trader login --broker alpaca

You choose paper vs live at login time.

IBKR

pip install "msts-trader[ibkr]"
msts-trader login --broker ibkr

You'll be asked for host, port, and client id of a running TWS or IB Gateway. Defaults:

• TWS live: 127.0.0.1:7496
• TWS paper: 127.0.0.1:7497
• Gateway live: 127.0.0.1:4001
• Gateway paper: 127.0.0.1:4002
• Dockerised Gateway: usually 127.0.0.1:4002 (whatever you mapped)

Before logging in, enable Configure → API → Enable ActiveX and Socket Clients in your TWS / Gateway. msts-trader connects, lists your managed accounts, and confirms NAV.

Schwab

pip install "msts-trader[schwab]"
msts-trader login --broker schwab

Requires a Schwab Developer app (https://developer.schwab.com) with the callback URL set to https://127.0.0.1:8182/. msts-trader pops a browser window, you authorize, and the token JSON is written to ~/.msts-trader/schwab_token.json. Schwab refresh tokens expire every 7 days — re-run msts-trader login --broker schwab when that happens.

Paper (offline simulator)

msts-trader login --broker paper

No real money, no broker connection. The book persists in ~/.msts-trader/paper_state.json between sessions. Reset any time with msts-trader paper-reset.

The first login you complete becomes the default broker. Override per command with --broker NAME, or change the default by logging in again.

Daily usage

1. Get your CSV. Click Copy CSV on the supported weights site, or build your own:

   ticker,weight
   SPY,0.42
   GLD,0.18
   EEM,0.20
   SHV,0.20
   

   • weight is a fraction (0–1), not a percent.
   • Sum should be ≤ 1.0 (the remainder is held as cash).
   • Comments starting with # are ignored.

2. Run:

msts-trader                       # uses default broker
msts-trader --broker alpaca       # explicit broker

3. Paste the CSV, hit Ctrl+D (Ctrl+Z then Enter on Windows).
4. Review the preview carefully.
5. Type y to execute, anything else to cancel.

Useful flags

msts-trader rebalance --dry-run                       # preview only, never sends
msts-trader rebalance --yes                           # skip the confirm prompt
msts-trader rebalance --threshold 0.02                # tighter rebalance (default 4%)
msts-trader rebalance --csv-file targets.csv          # read from a file
msts-trader --broker paper rebalance --csv-file ...   # test against paper

Other commands

msts-trader status                  # NAV, positions, market status (default broker)
msts-trader --broker alpaca status  # other broker
msts-trader brokers                 # list supported + configured brokers
msts-trader logout --broker alpaca  # clear stored creds for one broker
msts-trader paper-reset             # reset paper book to starting cash
msts-trader --version

What it does

• Parses your CSV into {ticker: target_weight}.
• Pulls live NAV, cash, buying power, and current positions from your broker.
• Quotes every relevant symbol via the broker's market-data API.
• Computes the dollar delta per ticker, skips anything within the drift threshold (default 4% of NAV).
• Sells tickers no longer in your targets.
• Sizes buys at the current quote, rounded to 2 decimals where the broker supports fractional MARKET orders.
• Shows the full plan and waits for y before sending anything.
• Submits MARKET DAY orders. Logs results to ~/.msts-trader/fills/.

What it does NOT do (v0.2)

• Pre-market or after-hours execution. Refuses outside 09:30–16:00 ET.
• Shorting. Negative weights are rejected.
• Options, futures, crypto.
• Multi-account or per-strategy ledger.
• Active stop management (Hydra/Fusion-style watchers).
• Automatic CSV polling. You paste each rebalance manually.

Security

• Your broker credentials live only in your OS keychain on your own machine. The app does not phone home, does not log credentials, and is not connected to any service operated by the author.
• The author of this app cannot view, recover, or revoke your broker access. Revoke via your own broker's API-app dashboard if a key leaks.
• Trades are user-initiated: every execution requires you to paste a CSV and confirm with y. There is no background trading loop.

Disclaimer

This tool sends real orders to your live brokerage account. You are responsible for the CSV you paste and the rebalance you confirm. Past performance of any signal source is not indicative of future results. The author makes no warranty of any kind; use at your own risk.

Development

git clone https://github.com/markudevelop/msts-trader.git
cd msts-trader
pip install -e ".[all,dev]"
pytest -v          # 95 tests, ~2 seconds
ruff check msts_trader

The test suite covers:

• CSV parser (header validation, weights, comments, dup/neg/>1 guards)
• Diff math (drift threshold, exits, warnings, blockers, BP overrun)
• Market hours (RTH/pre/after/closed, holidays through 2027, weekends)
• Paper broker end-to-end (cash accounting, position lifecycle, dry-run, persistence)
• Broker protocol conformance (every adapter exposes the required attrs + methods)
• Keychain (save/load/clear, default broker, broker enumeration)
• CLI (help, version, brokers list, paper login, no-creds clean exit)

Live brokerage adapters (Tastytrade, Alpaca, IBKR, Schwab) are not exercised against real APIs in CI — they need credentials and can move real money. The tests verify structure; you verify fills.

License

PolyForm Noncommercial License 1.0.0.

You may use, modify, and share this software for any noncommercial purpose — personal trading, research, education, hobby projects. Selling, hosting as a paid service, or otherwise commercializing this software or derivative works is not permitted without a separate commercial license. Contact the author if you need one.