Stream Chat API
Provides scalable in-app chat and activity feed infrastructure via REST and WebSocket APIs, enabling agents to create channels, send messages, manage users, and query feeds programmatically.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
API secret must be kept server-side; accidental exposure in client bundles is a known risk. No fine-grained permission scopes on API keys — it is all-or-nothing per app. JWT audience and expiry claims help limit blast radius of leaked user tokens.
⚡ Reliability
Best When
Building AI agents that need to participate in or orchestrate real-time chat channels, especially when user-facing SDK integration is already powered by Stream.
Avoid When
Your team needs an off-the-shelf support inbox or ticketing system rather than a programmable messaging layer.
Use Cases
- • Send automated messages or notifications into chat channels on behalf of a bot user
- • Query recent channel messages to summarize conversation history for customer support context
- • Create and configure new channels dynamically when users are onboarded or matched
- • Monitor activity feeds to trigger downstream workflows when specific events occur
- • Moderate channels by flagging, muting, or banning users based on policy rules
Not For
- • Email-based customer support workflows — Stream is real-time chat, not inbox/ticket management
- • Transactional email or SMS delivery — use a dedicated messaging gateway instead
- • Building a full CRM or helpdesk — Stream provides messaging infrastructure only, not case management
Interface
Authentication
Server-side calls use API key + secret in the Authorization header or as query params. Client-side users authenticate with short-lived JWT tokens signed with the app secret. Agents should operate server-side using the API key/secret pair and never expose the secret to end users.
Pricing
Separate pricing tracks for Chat and Activity Feeds products; usage-based overages apply above plan MAU limits.
Agent Metadata
Known Gotchas
- ⚠ Chat and Feeds are two distinct products with separate API namespaces and base URLs — importing the wrong SDK or hitting the wrong endpoint is a common mistake for agents new to Stream
- ⚠ JWT tokens expire (default 1 hour) and must be refreshed; agents that cache tokens without checking expiry will receive 401 errors mid-operation
- ⚠ Server-side API calls use api_key/secret while client-side calls require per-user JWTs — mixing these up causes auth failures that can be confusing to debug
- ⚠ Creating a channel with `watch: true` opens a WebSocket subscription; agents using REST-only should pass `watch: false` to avoid unintended long-lived connections
- ⚠ The `queryChannels` and `queryUsers` filters use a MongoDB-style query syntax that must be serialized as JSON query params — incorrect serialization silently returns empty results rather than an error
Alternatives
Full Evaluation Report
Detailed scoring breakdown, competitive positioning, security analysis, and improvement recommendations for Stream Chat API.
Scores are editorial opinions as of 2026-03-06.