Hi @TimmyFangs,
Due to the encryption used by 1Password, a traditional server side API is not something we're likely to implement. All of the data on our servers is encrypted, so it's not possible for us to read or alter it in a meaningful way. The SCIM bridge I mentioned before is intended to serve as a secure way for IdP's to integrate with 1Password, since you can deploy and control the SCIM bridge, and thus retain all of the credentials needed to decrypt and alter account data on your own. The SCIM bridge makes use of the SCIM protocol for communication, and thus could be used as an API endpoint, but that configuration isn't something we suggest or can provide in depth support for.
I hope this information helps. Be sure to let me know if you have any questions.