Candlestick bars
Open, high, low, close, volume, interval, source, session, and correction behavior.
CHARTING API
Charting Trader API
Developer guidance for building accurate, responsive financial charts without hiding data-source, session, adjustment, or freshness assumptions.
Developer overview
What this API category covers
A Charting Trader API combines data semantics with visualization performance. The chart should disclose whether bars are built from trades, bid, ask, or midpoint; whether prices are adjusted; how sessions are defined; and how live updates merge with history. Visual polish cannot compensate for ambiguous data.
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.
Live updates
Trades, quotes, partial bars, sequence handling, throttled rendering, and gap recovery.
Indicators
Input series, parameters, warm-up windows, precision, and reproducible calculations.
Annotations
Drawings, alerts, trade markers, notes, timestamps, and persistence.
Multi-timeframe views
Consistent aggregation, timezone, session, adjustment, and navigation.
Accessible interaction
Keyboard controls, text alternatives, high contrast, and data-table fallback.
Implementation
Production checklist
- Label data source and delay status.
- Define bar construction and sessions.
- Version adjustment and corporate-action rules.
- Merge history and live data deterministically.
- Throttle rendering without dropping state.
- Rebuild after stream gaps.
- Provide accessible data alternatives.
- Treat AI summaries as explanations, not guaranteed signals.
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
How to Compare Trader APIs
A weighted evaluation framework for workflow fit, data, execution, security, recovery, and cost.
Read guide →Secure Trading API Keys
Server-side credential patterns, least privilege, rotation, monitoring, and incident response.
Read guide →FAQ
Charting Trader API questions
What is a Charting Trader API?
It is an interface or component system for supplying and displaying financial time series, quotes, trades, indicators, annotations, and related interactions.
What creates a candlestick bar?
Bars may be built from trades, bid, ask, midpoint, or another source. The API should document the input, interval, session, and correction rules.
How should live bars update?
Apply ordered data to a defined partial bar, detect gaps, and reconcile with authoritative history when the stream is uncertain.
Can AI summarize a chart?
It can describe calculated features or provide research assistance, but output should cite inputs, state uncertainty, and not be presented as guaranteed financial advice.