API Rate Limiting for More Reliable Workflows

API rate limiting caps the number of requests clients can make over a period to protect services and manage traffic, using approaches such as token buckets, leaky buckets, fixed windows, and sliding windows that differ in their treatment of bursts and sustained demand. APIs commonly communicate limits through response headers and return HTTP 429 responses, often with a Retry-After value that clients should use to delay subsequent attempts. Effective rate-limit design tailors thresholds to client tiers and endpoint costs, documents limits clearly, and adjusts them as usage and infrastructure evolve. For workflows calling external APIs, n8n can help avoid failed runs through configurable retries, delays, batching, looping, exponential backoff, prefetching bulk data, and caching static information in data tables to reduce request volume. Because n8n is not an inbound rate limiter or API gateway, public webhook workflows exposed to unpredictable traffic should be protected by a dedicated API gateway or web application firewall, while queue mode and concurrency controls can help self-hosted deployments manage execution capacity.

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