SSI SDK Overview

Accelerate FastConnect integrations with the official SDKs.

When should you use the SDK?

The SDKs help teams adopt FastConnect faster by standardizing authentication, API calls, WebSocket streaming, and retry behavior across integrations. Instead of manually handling token management, request signing, rate limiting, and error recovery, the SDK handles these concerns so you can focus on business logic.

Client Architecture

All SDKs share the same modular client architecture:

Config → Auth → authenticate(otp) → Data / Trading / Stream

Client	Description	OTP Required
Auth	Authentication & token management. Entry point for all other clients.	-
Data	Market data — OHLC, indexes, securities info & summary.	No
Trading	Place/modify/cancel orders, account info, portfolio, PPMMR.	Yes
Stream	Realtime WebSocket streaming — market data & trading events.	Yes

Available SDKs

SDK	Runtime	Install	Source
Python SDK	Python 3.10+	`pip install ssi-sdk`	GitHub
Go SDK	Go 1.22+	`go get github.com/SSI-Securities-Inc/ssi-sdk-go/v3`	GitHub
Node.js SDK	Node.js 18+	`npm install @ssi.developer/ssi-sdk`	GitHub
.NET SDK	.NET 8.0+	`dotnet add package SSIDeveloper.FastConnect.Sdk`	GitHub

Python

Supports both sync and async variants (Auth/AsyncAuth, Data/AsyncData, etc.). Best for data pipelines, automation, and Jupyter notebooks.

from ssi_sdk import Auth, Data, Config

config = Config(
    client_id="YOUR_CLIENT_ID",
    api_key="YOUR_API_KEY",
    api_secret="YOUR_API_SECRET",
)

with Auth(config) as auth:
    auth.authenticate()

    with Data(auth) as data:
        ohlc = data.market_data.get_ohlc_1minute("SSI")
        print(ohlc)

Go

Uses goroutines natively for concurrency — no separate async variants needed. Best for high-throughput realtime services.

import "github.com/SSI-Securities-Inc/ssi-sdk-go/v3/ssi"

config := ssi.NewConfig("YOUR_CLIENT_ID")
config.APIKey    = "YOUR_API_KEY"
config.APISecret = "YOUR_API_SECRET"

auth := ssi.NewAuth(config)
defer auth.Close()

if _, err := auth.Authenticate(""); err != nil {
    log.Fatal(err)
}

data := ssi.NewData(auth)
ohlc, err := data.MarketData.GetOHLC1Minute("SSI")

Node.js

Supports both CommonJS and ES Module (dual CJS/ESM). All methods are async/await. Best for web backends, microservices, and serverless.

import { Auth, Data, Config } from '@ssi.developer/ssi-sdk';

const config = new Config({
  clientId: 'YOUR_CLIENT_ID',
  apiKey: 'YOUR_API_KEY',
  apiSecret: 'YOUR_API_SECRET',
});

const auth = new Auth(config);
await auth.authenticate();

const data = new Data(auth);
const ohlc = await data.marketData.getOhlc1Minute('SSI');
console.log(ohlc);

.NET

Uses async/await throughout on .NET 8. Business enums (OrderSide, Board, ...) are static classes holding string constants. Best for .NET backend systems and internal enterprise services.

using SsiSdk;

var config = new Config("YOUR_CLIENT_ID")
{
    ApiKey = "YOUR_API_KEY",
    ApiSecret = "YOUR_API_SECRET",
};

using var auth = new AuthClient(config);
await auth.AuthenticateAsync();

var data = new DataClient(auth);
var ohlc = await data.MarketData.GetOhlc1MinuteAsync("SSI");
Console.WriteLine(ohlc);

Feature Comparison

Feature	Python	Go	Node.js	.NET
REST API	Yes	Yes	Yes	Yes
WebSocket Streaming	Yes	Yes	Yes	Yes
Async support	`async`/`await`	goroutines	`async`/`await`	`async`/`await`
Resource cleanup	`with` / `async with`	`defer`	manual `disconnect()`	`using`/`IDisposable`
Error handling	Exception hierarchy	Type switch on `error`	`instanceof` on Error class	Exception hierarchy
Rate limiting	Built-in	Built-in	Built-in	Built-in
Auto retry	Built-in	Built-in	Built-in	Built-in
Token auto-refresh	Built-in	Built-in	Built-in	Built-in

Recommended Integration Flow

Install the SDK for your target runtime.
Configure credentials (client_id, api_key, api_secret, private_key).
Authenticate — OTP is optional for market data, required for trading & streaming.
Initialize the client you need (Data, Trading, or Stream).
Call APIs or subscribe to realtime data streams.

Use Case Mapping

Use case	Client	OTP
Market data (OHLC, indexes, securities)	`Data`	No
Place/modify/cancel orders	`Trading`	Yes
Account info & portfolio	`Trading`	Yes
Realtime WebSocket streaming	`Stream`	Yes

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