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Firstrade Authentication API

Session login and MFA flows

Firstrade Authentication API is one of 6 APIs that Firstrade publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Authentication. The published artifact set on APIs.io includes an OpenAPI specification.

This API exposes 4 operations across 4 paths, and defines 2 schemas. It is described by OpenAPI 3.0.3, at version 0.1.0.

Requests are made against a single base URL, https://api3x.firstrade.com.

4 operations 4 paths 2 schemas 1 GET3 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.3
API Version
0.1.0
Base URL
https://production.plaid.com
Authentication
API Key
Resource Areas
1

Authentication & Security 1

Firstrade Authentication API declares 1 security scheme for authenticating requests. An API key is passed in the header as ftat (sessionAuth).

  • sessionAuth — Session token obtained after login. The ftat header must be accompanied by a sid header (session ID) and the static access-token header (value: 833w3XuIFycv18y…

Paths & Operations 4

Across 4 paths, the API surfaces 4 operations — 1 GET, 3 POST. Each is listed below with its method, path, parameters, and response codes.

Authentication 4

Session login and MFA flows

GET
/
Initialise session
initSession → 200
POST
/sess/login
Login to Firstrade
login body → 200401
POST
/sess/request_code
Request OTP code via email or SMS
requestMfaCode body → 200
POST
/sess/verify_pin
Verify MFA code or PIN
verifyPin body → 200

Schemas 2

The contract defines 2 schemas that model the data the API accepts and returns. The most detailed are LoginResponse (5 properties), ApiResponse (1 property). Each schema is shown below with its type and property counts.

ApiResponse
object
1 property
LoginResponse
object
5 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

firstrade-authentication-api-openapi.yml Raw ↑

Other APIs Firstrade publishes across the network.

Firstrade Account Data API (via Plaid)
Firstrade Account API
Firstrade Market Data API
Firstrade Orders API
Firstrade Watchlist API
Where this information came from

This is an independent, third-party profile of Firstrade Authentication API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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