Estimate total consumption and peak request rate separately. Your application needs room for both.
Start with a simple calculation
Estimate requests as active polling loops × polls per minute × active minutes. This is a planning model, not a billing rule: check which requests your provider counts, including failed calls, batches, and any other metered operations.
For illustration, one loop making one request every minute uses 1,440 requests in a full day and 525,600 across 365 days. Four independent loops running continuously would use 2,102,400 before retries. These examples assume continuous operation; use your actual session schedule when estimating production traffic.
Budget for peaks as well as totals
A period allowance answers how many requests you can use overall. A rate limit constrains how quickly you can make them. An application can have plenty of allowance remaining and still send too many requests during a busy minute.
HTTP 429 is the standard signal for too many requests in a period. RFC 6585 leaves the counting policy to the service: limits can apply across resources or servers, and clients can be identified in different ways. Do not assume that adding another key increases your account’s available throughput. [1]
Share work where the data is identical
Our recommended first optimization is to find duplicate requests. Several widgets showing the same source and symbol may be able to share one backend fetch. Include every parameter that changes the result in your cache key, and enforce access before serving a cached response.
Choose a refresh interval that matches the product’s needs. A periodically refreshed overview and a rapidly updating quote display do not necessarily need the same cadence. Keep the observation time visible so reducing request volume does not disguise the age of the data.
Reserve capacity for recovery
Leave headroom for retries, user-triggered refreshes, and reconnects. Track actual consumption against your estimate, then investigate unexpected increases before simply raising the polling frequency or plan size.
When a server supplies Retry-After, parse it correctly: HTTP defines either a date or a non-negative number of seconds, not minutes. A value of 120 therefore means a two-minute delay. Honor that delay and use a bounded fallback when the header is absent or invalid. Rate-limit labels in a dashboard do not change the header’s units. [2]
References
Primary sources for the technical details in this article. Implementation suggestions are our own.