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SignatureAPI enforces rate limits to ensure fair usage and platform stability. Rate limits are applied per API key. There are two components to rate limiting:
  • Rate is the sustained number of requests allowed per second.
  • Burst is the maximum number of requests that can be sent in a short spike before throttling kicks in. Once the burst is exhausted, requests are throttled to the sustained rate.

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Default limits

MetricLimit
Rate10 requests/second
Burst10 requests

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Extended limits

For higher-volume workloads, the extended plan increases both limits:
MetricLimit
Rate1,000 requests/second
Burst1,000 requests
To upgrade to extended limits, contact support.

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Rate limit responses

When you exceed the rate limit, the API returns a 429 Too Many Requests response. 
// HTTP Status Code 429

{
    "type": "https://signatureapi.com/docs/v1/errors/too-many-requests",
    "title": "Too many requests",
    "status": 429,
    "detail": "The client is sending too many requests per second."
}

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Handling rate limits

When you receive a 429 response, wait briefly before retrying. A simple approach:
  1. Wait 1 second after receiving a 429 response.
  2. Retry the request.
  3. If you receive another 429, double the wait time (2 seconds, then 4 seconds, and so on).
  4. After 5 retries, stop and log the failure for investigation.