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Rate Limits

Fello enforces rate limits at both the Custom App (or API Key) level and at the Account level. Each rate limit implementation returns a set of response headers that provide insights into the current rate limit status.
Note: These default rate limits may be increased upon consultation with the Fello team and subsequent approval for elevated limits.

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App Level

  • GET Endpoints: 100 requests per 10-second window.
  • UPDATE Endpoints (including DELETE): 50 requests per 10-second window.
We use sliding window strategy for our 10-second window rate limiter.

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Headers

  • X-RateLimit-Limit-10: The total number of requests permitted within the current 10-second window.
  • X-RateLimit-Remaining-10: The number of requests remaining in the current 10-second window before reaching the limit.

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Account Level

An account is permitted up to 350,000 requests per day.

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Headers

  • X-RateLimit-Limit-day: The total number of requests permitted within the current day.
  • X-RateLimit-Remaining-day: The number of remaining requests for the current day before the limit is reached.

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Handling Errors

When the rate limit is exceeded, Fello returns a 429 Too Many Requests response. In such cases, consider the following strategies:
  1. Pause and Retry:
    Wait for a brief period before attempting your request again.
  2. Utilize Exponential Backoff:
    Incrementally increase the waiting interval between subsequent retries if 429 responses continue.