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Clearer cost decisions.

What changes the cost of an integration?

The number of supported devices is one input. So are the fields you require, the time range you import, the freshness your interface promises, and the amount of recovery your product needs to manage. A daily review screen has different workload assumptions from an active workout experience. Estimate these differences explicitly before comparing providers.

Keep API access fees separate from your own engineering and infrastructure effort. A free developer endpoint does not eliminate device testing, permission handling, release maintenance, or support work. Equally, a paid integration service needs a coverage and capability check rather than an assumption that every field is included.

A simple workload example

The following arithmetic is hypothetical, not a quote or a provider limit. Imagine 500 connected accounts, four scheduled synchronizations per account per day, and two requests in each synchronization. That produces 4,000 scheduled requests per day, before new-account imports, pagination, retries, and corrections.

500 accounts × 4 syncs/day × 2 requests/sync
= 4,000 scheduled requests/day

Now add the work excluded from that base case. How much history is imported at connection time? Does each endpoint need separate requests? What happens during a temporary outage? Can an old record be corrected later? Use measurements from a prototype to replace your assumptions. Keep any commercial price calculation separate until you have current, applicable provider terms.

Questions to take to a provider

• Which devices and exact record types are available for this use case?
• Does commercial use require approval, a contract, or a different access tier?
• How do quotas apply to backfills, pagination, concurrent users, and retries?
• What timing should users expect between recording, sync, and API availability?
• How are corrections, deletion, and withdrawn access represented?
• What versioning and change notices can your team rely on?

WearAPI.com publishes educational guidance. It does not sell a live API subscription or advertise a service-level commitment. For the complete estimation method and a primary example of documented request limits, read the wearable API cost planning guide.