CostUse

API prices

The billing unit sits next to the rate, so a per-message price is not mixed with a per-minute one.

Checkly

Synthetic monitoring with published browser and API check overage rates.

CircleCI

CI/CD with published credit pack rates and Docker layer cache storage.

Clerk

Authentication and user management with published monthly retained user overage rates.

ClickSend

Prepaid multi-channel messaging with volume-based US SMS top-up rates.

Cloudflare

Edge compute and storage products with usage-based add-ons.

Cloudinary

Media API for image and video transforms, storage, and delivery via credits.

ConfigCat

Feature flags billed by config JSON downloads with published Free through Dedicated plan quotas.

Contentful

Headless CMS with published Lite overages for API calls and asset CDN bandwidth.

Customer.io

Messaging automation with published overages for people profiles and additional email sends.

Daily

Video SDK with published pay-as-you-go rates per participant minute after free allotment.