# Syndica ChainStream API

**Canonical:** https://apis.io/apis/syndica-io/syndica-chainstream-api/  
**Provider:** Syndica — https://apis.io/providers/syndica-io/  
**Base URL:** wss://chainstream.api.syndica.io  
**Documentation:** https://docs.syndica.io/platform/chainstream-api/

Syndica ChainStream API is one of 4 APIs that [Syndica](https://apis.io/providers/syndica-io/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include Solana, ChainStream, Streaming, WebSocket, and JSON-RPC. The published artifact set on APIs.io includes API documentation, an API reference, authentication docs, an engineering blog, and an AsyncAPI specification.

ChainStream is Syndica's real-time Solana data streaming API. It consolidates updates from multiple validators using a "fastest wins" strategy so the subscriber benefits from the lowest-latency notification across the validator set, and offers an optional `verified` parameter that delivers only transactions confirmed by multiple validators at `processed` commitment. ChainStream uses JSON-RPC 2.0 over WebSocket (`wss://chainstream.api.syndica.io/api-key/<API_KEY>`) and supports `transactionsSubscribe`, `slotsSubscribe`, and encoded `blocksSubscribe` against `solana-mainnet` (devnet coming). Production users have cut limit-order time-to-fill from 10s to 300ms with it.

## Machine-readable artifacts (6)

- **Documentation** — https://docs.syndica.io/platform/chainstream-api/
- **APIReference** — https://docs.syndica.io/platform/chainstream-api/slot-subscriptions
- **Authentication** — https://docs.syndica.io/platform/concepts/api-keys
- **ProductPage** — https://syndica.io/infrastructure/chainstream
- **Blog** — https://blog.syndica.io/solana-data-streaming-how-to-power-your-dapp-with-real-time-data/
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/syndica-io/refs/heads/main/asyncapi/syndica-io-asyncapi.yml

## Other Syndica APIs (3)

- [Syndica Solana RPC (HTTP) API](https://apis.io/apis/syndica-io/syndica-solana-rpc-http-api/)
- [Syndica Solana RPC (WebSocket) API](https://apis.io/apis/syndica-io/syndica-solana-rpc-websocket-api/)
- [Syndica Sig Validator RPC API](https://apis.io/apis/syndica-io/syndica-sig-validator-rpc-api/)

## Tags

Solana, ChainStream, Streaming, WebSocket, JSON-RPC, Real-Time, Blockchain

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