What is API Polling?
Repeatedly checking an API at regular intervals for new data or status changes.
Definition
API polling is the practice of periodically sending requests to an API to check for new data, status updates, or state changes. A cron job calls the API at regular intervals (every minute, every 5 minutes, etc.) and processes any new information. Polling is the opposite of webhooks: instead of being notified, you actively check. It is used when the data source does not support webhooks or push notifications.
Simple Analogy
Like repeatedly checking your mailbox throughout the day instead of waiting for the mail carrier to ring the doorbell — it works, but it requires more effort and has a delay between the mail arriving and you finding it.
Why It Matters
Many external systems do not support webhooks, making polling the only option for integration. CronJobPro is ideal for API polling — set up a job that calls your polling endpoint at the desired interval, and your endpoint checks the external API for new data. Built-in retry logic handles transient API failures automatically.
How to Verify
Monitor your polling job's execution history for consistent success. Check the response body to see if new data was found. Watch for rate limit errors (429) indicating you are polling too frequently. Compare the polling interval against the source system's rate limits.
Common Mistakes
Polling too frequently, hitting rate limits and getting blocked. Polling too infrequently, missing time-sensitive data. Not implementing incremental polling (re-fetching all data instead of just changes since last poll). Not handling rate limit responses (429) gracefully.
Best Practices
Choose a polling interval that respects the API's rate limits while meeting your data freshness needs. Implement cursor-based or timestamp-based incremental polling to minimize data transfer. Handle 429 responses by backing off. Log the "last checked" timestamp for debugging.
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Try it free →Frequently Asked Questions
What is API Polling?
API polling is the practice of periodically sending requests to an API to check for new data, status updates, or state changes. A cron job calls the API at regular intervals (every minute, every 5 minutes, etc.) and processes any new information. Polling is the opposite of webhooks: instead of being notified, you actively check. It is used when the data source does not support webhooks or push notifications.
Why does API Polling matter for cron jobs?
Many external systems do not support webhooks, making polling the only option for integration. CronJobPro is ideal for API polling — set up a job that calls your polling endpoint at the desired interval, and your endpoint checks the external API for new data. Built-in retry logic handles transient API failures automatically.
What are best practices for API Polling?
Choose a polling interval that respects the API's rate limits while meeting your data freshness needs. Implement cursor-based or timestamp-based incremental polling to minimize data transfer. Handle 429 responses by backing off. Log the "last checked" timestamp for debugging.
Related Terms
Webhook
An HTTP callback that automatically sends data to a URL when a specific event occurs.
Interval
The fixed time gap between consecutive executions of a scheduled job.
Rate Limiting
Restricting the number of requests a client can make within a time window to prevent abuse.
Data Synchronization
Keeping data consistent and up to date across multiple systems through scheduled transfers.