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API base URL change & deadline

A change to the Stannp.com API, and what users need to do to migrate by 1st Sept 2026, if they are using the old "dash.stannp" base URL.

Stannp has a mission to make direct mail accessible to any size of company. We want every company in the world to be able to benefit from direct mail without the complexity. We have rapidly grown with over one hundred thousand users registering on our platform. Every user trusts us with their data, so we take security seriously.
 

We recently redeveloped large amounts of our code base and infrastructure, adding additional security layers, features and prepared for even more scale. We worked on this in parallel with our existing infrastructure to keep minimum disruption by introducing a new endpoint for our API. We must now retire the older infrastructure and migrate any remaining API users over to the new URL.

This means anyone using the the old API must adjust to the new URL before the 1st of September 2026.

It's just one small change required.

For our North American based customers, you must change your base URL

from -us.stannp.com/api/v1, to - api-us1.stannp.com/v1

For our UK and EU accounts, you must change your base URL

from - dash.stannp.com/api/v1, to - api-eu1.stannp.com/v1

Notice, we still call this V1 (version 1) so our requests still work and process the same.

Very minor changes you may see.

  • We are a little stricter on input. We will try to validate and return bad requests earlier. This just means we will return a 400 error if the address lacks essential address information.

  • Response properties are the same with some extra ones with certain requests. This will not break any serialisation to strict models so we expect your code to continue to work as it was.
  • We must OCR all letter/post requests by default. Our carriers rules means we must read the address and be able to produce barcodes for all mail items.
  • There are increased rate limits based on your subscription plan.

Remember, you can log into your dashboard and enable API logging to debug and double check your requests are working as intended.

Login, select 'Settings', then select 'API Request Log'. Link if preferred: https://app-us1.stannp.com/settings/api-log 

Read our API documentation on our website HERE

Using a third party integration tool, such as 'Zapier'?

Make sure you are using the most up to date integration version as only this will contain the correct v2 API endpoints.

You will need to update every active API endpoint for this to remain active after 1st Sept 2026.

Zapier example:

  • Open your Zap configuration to edit and click on Stannp and then go to set up. (Don't click the 3 dots as this is a different options menu).

    Notice that the version below is 'Stannp (1.7.8)' (image 1). The version needs to be upgraded to 1.8.0 or above to use our v2 API endpoints.

     

  • Click "change" (image 2), search Stannp again and select the latest version. Make sure to test the step and hit 'publish'. 

1.   2. 

The same step should now look something like this: