We're building an integration using the Klaviyo API (revision 2024-10-15) and discovered that the GET /api/accounts/ endpoint returns an HTTP
500 Internal Server Error when the account's contact information does not have a country set.
Steps to reproduce:
1. Get an acount with the Country field empty
2. Call GET https://a.]klaviyo.com/api/accounts/ with a valid private API key and revision: 2024-10-15 header
3. Response: 500 Internal Server Error
Expected behavior:
The endpoint should return 200 with the account data, either with the country field empty/null or with a validation error (4xx) indicating
the missing field.
Actual behavior:
The endpoint returns a 500 server error with no meaningful error message. This is a server-side crash, not a client error.
Additional observations:
- This is not transient — the 500 persists on every request until the country is set
- Affects both OAuth bearer tokens and private API key authentication
- All other endpoints (/api/lists/, /api/flows/, /api/metrics/, /api/profiles/) work fine on the same account
- Setting a country in Contact Information immediately fixes the issue
- We've confirmed this across multiple affected accounts
- PATCH /api/accounts/ returns 405 Method Not Allowed, so there is no way to fix this programmatically on behalf of the user
Impact:
Any integration that calls /api/accounts/ during onboarding (to retrieve account ID, timezone, currency, etc.) will fail silently for users
who haven't filled in their country. Since the error is a 500 with no descriptive message, it's very difficult to diagnose without knowing
the root cause. There is no alternative endpoint that provides this account-level metadata.
