Integrate the Gmail API.Caddi writes and runs the integration for you.
Gmail has a REST API. Self-serve for any developer with a Google Cloud project, but public apps that use restricted Gmail scopes must pass restricted-scope OAuth app verification, and a security assessment if they store or transmit that data on servers.
- 99%of agent runs complete successfully
- ~45 minon average to build your first agent
- 1M+back-office tasks completed
The connection is a project before it does anything.
Before the first record moves: an app registration, credentials, token refresh, and somewhere to host and monitor the code. 1,200,000 quota units per minute per project and 6,000 quota units per minute per user per project, with each method costing a set number of units (e.g., messages.send = 100).
Register an app, store Gmail credentials, refresh tokens and code around the rate limits.
Connect your Gmail account once. Caddi holds the connection.
The job doesn't stop at Gmail.
An intake, a filing or a client update also runs through email, documents and the other systems your team works in. The Gmail API only reaches Gmail.
Each extra system is another API, another set of credentials, another integration to own.
One automation runs across every tool the job touches, each through its API.
Someone has to own the code.
API versions change, fields get added and your process moves.
A developer patches and redeploys the integration each time.
The person who does the work updates it by showing or describing the change. Every automation is reviewed before it runs in production, and every run is logged.
What the Gmail API gives you
- Type
- REST (JSON)
- Authentication
- OAuth 2.0
- Who can get access
- Self-serve for any developer with a Google Cloud project, but public apps that use restricted Gmail scopes must pass restricted-scope OAuth app verification, and a security assessment if they store or transmit that data on servers.
- What it covers
- Messages, threads, drafts, labels, history, attachments, and mailbox settings (filters, forwarding, send-as, vacation).
- Limits
- 1,200,000 quota units per minute per project and 6,000 quota units per minute per user per project, with each method costing a set number of units (e.g., messages.send = 100).
Official docs: developers.google.com. Checked September 2026. Vendors change access terms, so confirm with Gmail before you build.
When to build the Gmail integration in-house
When you have engineers and the integration is your product, or you need one narrow sync between two systems and someone to own it. When the goal is getting Gmail work off someone's desk, the build is the slow part, and Caddi does it for you.
What teams usually want the Gmail API for
Inbox triage to CRM
Caddi reads inbound mail, identifies the contact and intent, logs the conversation in the CRM, and opens the right follow-up task.
Templated reply draft
When a recognized request comes in, Caddi drafts a personalized reply from the right template and queues it for one-click send.
Attachment classifier
Caddi extracts attachments, classifies them, files them in cloud storage, and updates the matching record.
Everything Caddi does with Gmail.
Gmail API questions
Does Gmail have an API?
Yes. Gmail has a REST API, authenticated with OAuth 2.0. The official documentation is at https://developers.google.com/workspace/gmail/api/guides.
How do I get access to the Gmail API?
Self-serve for any developer with a Google Cloud project, but public apps that use restricted Gmail scopes must pass restricted-scope OAuth app verification, and a security assessment if they store or transmit that data on servers.
Does the Gmail API have rate limits?
1,200,000 quota units per minute per project and 6,000 quota units per minute per user per project, with each method costing a set number of units (e.g., messages.send = 100).
Can I connect Gmail to my other tools without writing code against its API?
Yes. With Caddi you show the Gmail task once, the way you'd train a new hire, and Caddi builds it as verified code that runs across Gmail and the other tools the job touches. Steps that need a person's judgment are handed to Copilot or Claude, and Caddi monitors those too.
Do I need a developer to automate Gmail with Caddi?
No. There is no integration code for you to write or maintain. Every automation Caddi builds for Gmail is reviewed before it runs in production, and every run is logged.