# ACTIV OnePlatform Web API (One API)

**Canonical:** https://apis.io/apis/activ-financial-systems/activ-oneplatform-web-api-one-api/  
**Provider:** ACTIV Financial Systems — https://apis.io/providers/activ-financial-systems/  
**Base URL:** https://weboneapi.activfinancial.com  
**Documentation:** https://weboneapi.activfinancial.com/

ACTIV OnePlatform Web API (One API) is published by [ACTIV Financial Systems](https://apis.io/providers/activ-financial-systems/) on the [APIs.io](https://apis.io/) network. Tagged areas include Market Data, Real-Time Data, Streaming, WebSocket, and Time Series. The published artifact set on APIs.io includes API documentation, an API reference, a getting-started guide, and authentication docs.

WebSocket/WebAssembly JavaScript API for the ACTIV OnePlatform (Options Atlas), delivering real-time streaming subscriptions, snapshots, queries, and time-series (tick, intraday bar, history bar) market data through a session contract (connect to a OneApi Gateway, then Session.snapshot/subscribe/query/timeSeries). Not REST - the machine-readable contract is the TypeDoc JSON shipped in the "@activfinancial/one-api" npm package.

## Machine-readable artifacts (8)

- **Documentation** — https://weboneapi.activfinancial.com/documentation
- **APIReference** — https://weboneapi.activfinancial.com/documentation
- **GettingStarted** — https://weboneapi.activfinancial.com/tutorials
- **Sandbox** — https://weboneapi.activfinancial.com/playground
- **SourceCode** — https://github.com/activfinancial/one-api-examples
- **ErrorCatalog** — https://raw.githubusercontent.com/api-evangelist/activ-financial-systems/refs/heads/main/errors/activ-financial-systems-error-codes.yml
- **Authentication** — https://raw.githubusercontent.com/api-evangelist/activ-financial-systems/refs/heads/main/authentication/activ-financial-systems-authentication.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/activ-financial-systems/refs/heads/main/apis.yml

## Tags

Market Data, Real-Time Data, Streaming, WebSocket, Time Series

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/activ-financial-systems/activ-oneplatform-web-api-one-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/activ-financial-systems/.