Account data
Balances, buying power, permissions, account identifiers, and time-sensitive margin fields.
BROKER API
Broker APIs
Independent engineering guidance for comparing brokerage interfaces without assuming access, features, or production behavior.
Developer overview
What this API category covers
A broker API can expose multiple responsibilities through several interfaces. One application may need reference data and quotes; another may need positions, balances, orders, and fills. Account type, market subscriptions, jurisdiction, and platform architecture can change what is available. Evaluate the exact interface and account context rather than the brand name alone.
Do not choose an interface from a marketing checklist alone. Verify schemas, units, timestamps, permissions, failure behavior, testing conditions, and data-use terms for the exact product and account. A production integration should be able to recover authoritative state after a disconnect without guessing.
Capability map
Core integration responsibilities
Use these responsibilities to define architecture, acceptance tests, and provider evidence.
Portfolio state
Positions, average cost, realized and unrealized values, and reconciliation identifiers.
Order management
Validation, submission, replace, cancel, acknowledgments, rejections, and fill events.
Market data
Quotes, trades, bars, depth, reference data, entitlements, and exchange subscriptions.
Paper environments
Safe software testing with clearly documented differences from production.
Operational controls
Session recovery, pacing, idempotency, alerts, audit records, and emergency shutdown.
Implementation
Production checklist
- Identify account and regional requirements.
- List required asset classes and order types.
- Map every order and fill state.
- Confirm market-data entitlements and display rights.
- Test timeouts, disconnects, and duplicate messages.
- Use read-only and trading credentials separately where possible.
- Reconcile provider state after every uncertain operation.
- Review Interactive Brokers and NinjaTrader pages as starting points.
Conceptual adapter
const adapter = {
instruments: "provider identifiers",
timestamps: "UTC + source context",
numbers: "exact decimals",
streaming: "snapshot + recovery",
orders: "idempotent state machine",
credentials: "server-side only",
evidence: "docs + tests + logs"
};
Related research
Continue evaluating
Interactive Brokers Trader API
Independent questions for account, market-data, order, session, and permission workflows.
Open overview →NinjaTrader Futures API
Research topics for strategies, add-ons, futures data, order events, and platform lifecycle.
Open overview →FAQ
Broker APIs questions
What is a broker API?
A broker API is an interface that may expose account, portfolio, market-data, or order-management capabilities for an eligible brokerage account.
Are broker API credentials safe in a browser?
Secret credentials should not be embedded in browser or mobile code. Use a protected backend with narrow application operations and least-privilege provider permissions.
Is paper trading identical to live trading?
No. Simulated fills, market impact, queue position, data, and rejection behavior may differ. Paper environments validate software mechanics, not future performance.
What should happen after an order timeout?
Treat the result as unknown. Reconcile by a stable client-order identifier or authoritative order query before retrying.