Last updated: October 2026. Written by Athar Ahmad, Certified Bubble.io Developer and Tech Architect, Simple Automation Solutions.

Bubble’s features, plugin options and interface change over time, so check its current documentation for exact steps and names.

What is the Bubble API Connector?

The API Connector is a Bubble plugin that lets your app make requests to outside services that offer an interface, called an API, such as payment, email, e-signature, mapping or AI providers. You describe each request once, test it and then use it in workflows or as a data source. It is the main way to connect a Bubble app to services that do not have a ready-made plugin.

The steps, in plain language

1. Read the provider’s documentation. Note the address, the request type, the required information, the authentication method and the limits.
2. Add an API in the connector and give it a clear name, such as the provider’s name.
3. Set authentication. Many providers use a secret key passed in a header, others use a username and password or a sign-in flow. Follow the provider’s instructions.
4. Add a call for each action, such as “create invoice” or “send message”, with the correct request type and address.
5. Add parameters for the values you will send. Mark secret values as private so they are not exposed to the browser.
6. Initialise the call with real test values so Bubble learns the structure of the response.
7. Decide how it is used: as data, to fetch information, or as an action, to do something.
8. Use it in a workflow, with error handling for failures.
9. Test thoroughly, including failures, in the test version.

Protecting keys and sensitive data

• Keep secret keys private. A key visible in the browser can be misused at your expense. Mark parameters as private and keep calls that use them on the server side.
• Prefer backend workflows for calls involving secrets or sensitive data, so the key never reaches the user’s browser.
• Send the minimum data the provider needs.
• Check the provider’s terms on retention and use of data, especially for AI and document services.
• Use separate keys for test and live, and rotate them if exposed.
• Restrict what a key can do where the provider allows.

See our security guide and our explainer on what an API is.

Handling errors and limits

Common mistakes

• Putting a secret key in a place the browser can see.
• Using live keys while testing.
• No handling for failed calls.
• Calling the service on every page load, raising usage and cost. See workload units.
• Not recording which keys and accounts belong to whom.
• Forgetting that each integration needs maintenance.

Documenting each integration

When should you get help?

Simple integrations are within reach of a careful builder. Anything involving payments, personal or confidential data, complex authentication or heavy volumes deserves an experienced person and a review. Simple Automation Solutions scopes integrations in the PRD from a $345 Discovery Sprint, credited toward the build. Builds start at $3,500, and support is from $35 per hour. See what to cut before you build.

Frequently asked questions

What is the Bubble API Connector?

A Bubble plugin that lets your app call outside services through their APIs, with requests you define, test and use in workflows or as data.

How do I keep API keys safe in Bubble?

Mark secret parameters as private, make calls that use them on the server side, ideally in backend workflows, and use separate test and live keys.

What does initialising a call mean?

Running the call with real test values so Bubble can learn the structure of the response.

What happens if the outside service is down?

Your workflow should handle the failure with a clear message, a retry where safe and an alert.

Should I use the API Connector for payments or sensitive data?

With care. Use an experienced builder and a review, keep secrets server-side and send the minimum data.