x-acf-sensor-data header.
Check out few of its features
- Affordable
- Fool-proof, most things are handled server-side
- Very customizable
- Sub-millisecond response times
- First-class http2 support
- PoW (Proof of work) challenge support
- DCI (sdk_challenge.js) support
- Maintained Go SDK
Currently supported Android bmps
- 3.3.9
- 3.4.0
- 4.0.0
Currently supported iOS bmps
- 3.2.6
- 3.3.9
- 4.0.0
- 4.0.2
- 4.0.4
- 4.1.4