Syndica

Syndica ChainStream API

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/`) 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.

GitHub

Documentation

📖
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

Specifications

⚙
AsyncAPI
https://raw.githubusercontent.com/api-evangelist/syndica-io/refs/heads/main/asyncapi/syndica-io-asyncapi.yml

Other Resources

🔗
ProductPage
https://syndica.io/infrastructure/chainstream
🔗
Blog
https://blog.syndica.io/solana-data-streaming-how-to-power-your-dapp-with-real-time-data/

Work with this as data

Every API here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for apis

7 MCP tools reach this
  • find_apisBrowse and filter every API in the catalog.
  • get_api_artifactsOne API's artifacts, grouped by type.
  • get_openapiThe primary OpenAPI for this API.
  • find_similar_apisAPIs that look like this one.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This API 
curl "https://apis.io/api/v1/apis/syndica-chainstream-api"
All apis 
curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

AsyncAPI Specification

syndica-io-asyncapi.yml Raw ↑