If your contract includes metered API access, usage is calculated as follows.
Voxie APIs
api.voxie.com
Requests that complete with an HTTP status code of 2xx, 3xx, or 4xx not equal to 401, 403, 413, 414, 429 are metered.
connect.voxie.com
Requests that complete with an HTTP status code of 2xx are metered.
Integrations
API Destinations
Each request we send is metered, regardless of result. Note that deliveries may need to be retried, and each retry is metered separately. 3xx and 4xx HTTP status codes not equal to 429 are not retried.
Event Subscriptions
Each request we send is metered, regardless of result. Note that deliveries may need to be retried, and each retry is metered separately. 3xx and 4xx HTTP status codes not equal to 429 are not retried.
mParticle
Requests in both directions are metered. Audience change data we receive from mParticle is metered per request, and each event we send to mParticle is metered per request. All outbound failed requests are retried, and all attempts are metered.