Crossref Metadata Search vs External Accounts API
If you need a Books API that's easy to integrate, go with Crossref Metadata Search.
Crossref Metadata Search
Books & Articles Metadata
External Accounts API
The External Accounts API is used to manage accounts for Viber Business Messages, Facebook Messenger and Whatsapp for use in the [Messages](https://developer.nexmo.com/messages/overview) and [Dispa...
Crossref Metadata Search
- No authentication required
- HTTPS supported
External Accounts API
- Simple API key authentication
- HTTPS supported
| Feature | Crossref Metadata Search | External Accounts API |
|---|---|---|
| Authentication | None | apiKey |
| HTTPS | Yes | Yes |
| CORS | Unknown | Unknown |
When to use which?
Crossref Metadata Search is the better choice for quick prototypes and hackathons since it requires no authentication.