Introducing the Lunio Developer API
Canadian tax logic is frustrating to build correctly.
Between GST, HST, PST, and QST differences across provinces and territories, even simple invoice calculations can become messy fast. Most APIs are either too enterprise-focused, too expensive, or built primarily for U.S. tax workflows.
That is why we built the Lunio Developer API.
The Lunio Developer API provides a simple way for developers to integrate Canadian tax calculations directly into their apps, SaaS products, e-commerce systems, invoicing tools, and internal finance workflows.
What the API Currently Supports
The Lunio Developer API currently supports:
- GST, HST, PST, and QST calculations
- Province-aware tax logic
- Reverse tax calculations
- Secure API key authentication
- Usage tracking
- Developer dashboards
- Interactive API documentation
- Free and paid request tiers
Current endpoints include:
- GET /tax/rates
- POST /tax/calculate
- POST /tax/reverse
Built for Real Canadian Workflows
The API was designed specifically for Canadian workflows, including:
- Invoice builders
- SaaS billing systems
- E-commerce checkout previews
- Internal accounting tools
- Client portals
- Finance dashboards
Instead of rebuilding provincial tax logic every time, developers can integrate a predictable JSON API and move faster.
Security and API Key Management
The Lunio Developer API includes secure API key handling with:
- One active API key per account
- Regenerate and revoke support
- Usage tracking
- One-time key reveal for improved security
API keys are treated similarly to passwords and are never permanently exposed after creation.
Developer Dashboard and Documentation
We also launched a dedicated Developer Portal with:
- Interactive API docs
- Language examples
- Usage monitoring
- Plan management
- API key controls
The goal is to keep the experience simple, clean, and approachable for indie developers and growing Canadian businesses.
Pricing
The Lunio Developer API currently includes three request tiers:
Free
100 requests/month
Starter
5,000 requests/month
Growth
25,000 requests/month
All plans include access to the same core endpoints.
What’s Next
This is only the beginning.
Future improvements may include:
- Expanded tax metadata
- Better reporting endpoints
- Webhooks
- SDKs and helpers
- Additional developer tooling
- More advanced finance infrastructure for Canadian businesses
Try the Lunio Developer API
You can explore the documentation and generate your API key today.
We’re excited to continue improving the platform and building tools focused specifically on Canadian businesses and developers.