# Intervals.icu FAQ

**URL:** <https://forum.intervals.icu/t/intervals-icu-faq/123707>\
**Category:** Guide\
**Created:** [3 March 2026 07:29 UTC](https://forum.intervals.icu/t/intervals-icu-faq/123707 "2026-03-03T07:29:24Z")\
**Posts on this page:** 1\
**Showing post:** 4

<div class="post-metadata">

**Author:** ![R2Tom](https://forum.intervals.icu/user_avatar/forum.intervals.icu/r2tom/32/50144_2.png) [@R2Tom](https://forum.intervals.icu/u/R2Tom)\
**Post date:** [3 March 2026 07:32 UTC](https://forum.intervals.icu/t/intervals-icu-faq/123707/4 "2026-03-03T07:32:44Z")

</div>

# FAQ: API Access

## Why do I get API access denied? (401 Unauthorized / 403 Access denied)

Most cases are authentication format issues.

Check these points:

- Username must be **literally** `API_KEY` (NOT your actual key string and NOT your athlete ID).
- Use the correct auth type from the API example (`Basic`, not `Bearer`).
- Verify token string formatting (no extra spaces/characters).
- Verify athlete ID/path (`0` for own account endpoints; `i...` ids where required).

Links:

- [[SOLVED] API 401/403 Access error](https://forum.intervals.icu/t/solved-api-401-403-access-error/96914)
- [API access to Intervals.icu](https://forum.intervals.icu/t/api-access-to-intervals-icu/609)

## Request for Oauth2 and/or Webhooks

If you develop an application and want to integrate via Oauth, then write David a private message according that post:

- [Intervals.icu OAuth support](https://forum.intervals.icu/t/intervals-icu-oauth-support/2759)

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