API (Application Programming Interface)
A set of rules that allow two software applications to communicate. Most automation workflows use APIs to connect tools like HubSpot, Stripe, or Google Sheets without manual exports.
Expert insight
If a tool has an API, it can be automated. If it doesn't, you're stuck with manual exports.
In a real workflow
A new Stripe payment calls the HubSpot API to update the deal to "Closed won" and the Xero API to create the invoice, with no export or copy-paste in between.
Common mistakes
- Building against an API without reading its limits and error codes, so the workflow breaks the first busy day.
- Assuming every tool has a complete API: many expose only part of their data, so check the fields you need before choosing a tool.
Complexity level
Anyone can understand this no technical background needed.
See it in action
Want this built into your automation?
Book a free audit and we'll show you exactly how this applies to your business.
Get my free automation plan →Who we build for
Run a firm, an agency or an online store? We automate the work behind it.
Done-for-you n8n workflows and Claude AI agents, fixed price, maintained for you.
- Professional firms Onboarding, documents, billing and reporting run on their own. See what we automate →
- Agencies and SaaS teams Custom n8n and Claude builds, client reporting and internal tools. See what we automate →
- E-commerce brands Orders, support, returns and stock handled without the busywork. See what we automate →
More in Core concepts
Keep exploring
API Rate Limit
A cap on how many API requests you can make per second, minute, or day…
Action (automation step)
A single operation performed by an automation after a trigger fires. E…
Automation workflow
A sequence of automated actions triggered by a specific event. Example…
Condition / branching
Logic within a workflow that routes execution down different paths bas…
CRON / scheduled trigger
A time-based trigger that fires an automation at fixed intervals every…
Custom code node
A step in n8n or Make that lets you write JavaScript or Python directl…
Go deeper
Guides that cover API
Twilio vs Vonage vs MessageBird vs Plivo: Which Communication API Should Power Your Automation Stack in 2026?
Four CPaaS platforms let your workflows send SMS, make calls, and route WhatsApp messages programmatically. The wrong pick means rebuilding your notification layer mid-scale.
n8n API: The Complete Guide to Automating n8n Itself (2026)
n8n has a full REST API for managing workflows, executions, and credentials programmatically. Here's how to actually use it, with real authentication setup and common patterns.
Best Usage-Based Billing Software in 2026: Stripe, Metronome, Orb, Chargebee, Maxio, Zuora and Lago Compared
Billing platforms compared for usage-based and hybrid pricing: metering, prepaid credits and commits, revenue recognition, real fees and time to launch, with a clear pick for SaaS, AI and API companies.