B

Builder Write API

REST discovered

Details
Docs
https://www.builder.io/c/docs/write-api
Authentication
Builder Private API Key bearer discovered Get token ↗
Authorization: Bearer <credential>

In Builder, create or copy a Private API Key for your Space as described in Using the Builder API Key. The docs note this key is server-side and grants write access; Upload API says creating one requires Developer or Admin permissions. Send it in the Authorization header for private/admin APIs.