Authentication
The free tier works with no key at all. A key raises your limits and unlocks Pro: the research layer (full content, curated guides, catalog intelligence) and the Pro governance capabilities — see Plans.
Tiers
| Tier | Who | How | Limits |
|---|---|---|---|
| Free | Everyone | No key — just call the API | 5 req/s, 1,000 req/day |
| Pro — $29/mo | Individuals and agents needing depth | Sign in and upgrade; send your key | 10 req/s, 5,000 req/day |
| Team — $149/mo | Groups | Sign in and upgrade; multiple keys | 25 req/s, 25,000 req/day |
| Internal | API Evangelist's own sites and MCP server | A shared secret held by the network's own services | — |
Every response carries the policy for the tier that served it, in the RateLimit-Policy and
X-RateLimit-* headers.
Getting a key
Sign in with GitHub, Google or LinkedIn and you get a free-tier key straight away. Upgrading to Pro or Team moves that key onto the paid plan when checkout completes.
Using an API key
Send it in the x-api-key header:
Code
Code
The MCP server
The MCP server uses OAuth 2.1: an MCP client that supports it is sent to sign in the first time it calls a Pro tool, and the same account and plan apply.
Higher limits
Team covers most groups. For anything beyond it — volume, annual billing, an enterprise arrangement — email [email protected] with a short description of what you're building.