> For the complete documentation index, see [llms.txt](https://docs.tryterra.co/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tryterra.co/unified-api/pricing.md). # Pricing Learn how Unified API credits are charged on the Quick Start plan, and how add-on products are priced. Terra pricing starts with the Unified API on the Quick Start plan, which uses usage-based pricing in Unified API credits. Add-on products extend the plan, and each is priced on its own. This page explains how both work. ## At a glance * 100,000 included Unified API credits that reset monthly. * Tiered pricing and volume discounts as your user base grows. * Usage Spike Protection if your usage spikes unexpectedly in your first 6 months. * The included credits cover 500 active authentications a month, each with up to 400 events. * Add products as you need them. ## Unified API ### How credits work 1. **Monthly allowance:** Your Quick Start subscription gives you 100,000 free Unified API credits each month. 2. **Usage:** Unified API usage consumes Unified API credits, based on connected users and events. 3. **Monthly reset:** Unified API credits reset to 100,000 each billing period and do not roll over. 4. **Scaling:** Only pay for Unified API credits beyond your 100,000 monthly allowance. Additional usage is billed monthly. 5. **Volume discount:** The more Unified API credits you use, the cheaper each one gets (tiered pricing). ### Credit prices Your Quick Start subscription includes 100,000 monthly Unified API credits, covering the needs of most startups during their initial launch and growth phases. Tiered pricing applies beyond this: | Total monthly Unified API credits consumed | Cost per additional credit | | ------------------------------------------ | ----------------------------- | | 0 - 100,000 | $0 (Included in subscription) | | 100,001 - 1,000,000 | $0.005 | | 1,000,001+ | $0.003 | ### Usage Spike Protection Rapid growth or a testing error can cause an unexpected bill. Usage Spike Protection covers this. * If you receive an unexpectedly large bill in your initial 6 months (counted from the first invoice charged to your card) due to a significant spike from rapid user growth or a testing or implementation error, you may be eligible for a one-time refund. Specific criteria apply, such as bill threshold or usage increase. * Contact the support team. We'll review your situation, work towards refunding the unexpected amount, and help you optimise future usage. ### What consumes credits The number of Unified API credits consumed monthly scales with your number of users (active authentications) and events.
AboutActive authenticationsEvents
What it isAn active authentication represents an end-user's wearable, sensor, or fitness app that has been authenticated with Terra

Data payloads and notifications sent by Terra to your backend. This includes:

  • Data Sync Events: Health, activity, sleep, workout data, etc.
  • Authentication Events: User authentication status or permission updates.
How it's measured

An active authentication represents a health data source that both:

  1. Has been authenticated by an end user
  2. Has not been deauthenticated

Each individual event transmission is counted.

  • Example: A webhook sending a Daily payload for one end-user is one event

  • Free tier: 400 events per active authentication

    • 95% of customers are never charged for events
Cost200 Unified API credits per active authentication per month

The first 400 events per active authentication are free.

0.5 Unified API credits per event beyond this.

### Model credits
AboutModel run
What it isA model run applies one of Terra's health models (e.g. Sleep Window, Health Terrain) to a single user's data for a date range, returning a ready-to-use insight.
How it's measuredEach run counts as one, regardless of how much data the date range covers. Running two models, or the same model on two users, is two runs.
Cost1 credit per model run ($0.01 per credit).
## Add-on products Add-on products extend your plan. Activate them from **Settings → Plans & Pricing → Additional Products** on the dashboard. Each add-on is billed separately from your plan fee. Add-ons that use credits have their own credit balance. Add-on usage never draws down your Unified API credits, and Unified API usage never draws down an add-on's credits. Each add-on's pricing page explains what consumes its credits. | **Add-on** | **Price** | **Includes** | | ------------------------------------------------------------- | ---------------------- | --------------------------------------- | | [Lab Reports API](/lab-reports/pricing.md) | $499/month + usage | 100,000 Lab Reports credits a month | | [Planned Workouts](/planned-workouts-api/pricing.md) | $99/month + usage | 20,000 Planned Workouts credits a month | | [Streaming API](/streaming-api/pricing.md) | $99/month + usage | 20,000 Streaming credits a month | | [Health Scores](/user-engagement/health-scores-pricing.md) | $499/month | 14-day free trial | | [Graph API](/graphs/pricing.md) | $50/month per 2 graphs | - | | [Health Rewards](https://tryterra.co/products/health-rewards) | Contact us | - |