Webhook vs API explained: when to use each
Webhook vs API explained: when to use each
The webhook vs API distinction confuses people because webhooks use APIs — they're not opposites. An API is a door you knock on to ask for something. A webhook is a doorbell that rings when something happens. APIs are pull-based (you request data). Webhooks are push-based (data arrives when events occur). Unlike generic AI automation posts, this guide shows real CodeWords workflows — not just theory.
Use APIs when:
- You need data on demand (look up a customer, check inventory)
- You're performing actions in another system (create record, send email)
- The source system doesn't support webhooks
- You need guaranteed data retrieval (webhooks can fail silently)
Use webhooks when:
- You need real-time event notification
- You're triggering workflows based on external events
- Polling would be too expensive or too slow
- The source system supports webhook registration
Real-world automation example
Trigger (webhook): Stripe sends a webhook to your CodeWords workflow when a payment fails.
Processing (API calls): The workflow calls the Stripe API to get the customer's payment history, calls your CRM API to check the customer's tier, and uses an LLM (native in CodeWords) to draft a personalized recovery email.
Action (API calls): The workflow calls the SendGrid API to deliver the email and the Slack API to notify the account manager.
The webhook started the chain. APIs powered every step after that. This pattern — webhook trigger, API enrichment, AI processing, API action — is the backbone of intelligent automation on CodeWords.
Common mistakes
Polling instead of using webhooks. If the service offers webhooks, use them. Checking an API every 5 minutes wastes compute and money.
Not validating webhook signatures. Most webhook providers sign payloads with a secret key. Always validate signatures to prevent spoofed webhook calls.
FAQs
Can I convert a polling workflow to webhook-based?
If the source service supports webhooks, yes. Response time drops from minutes to seconds.
Which is faster?
Webhooks deliver data instantly when events occur. API polling has latency equal to your polling interval.



