The new PCB Artists I2C methane sensor module is based on Figaro TGS2611. The sensor is compatible with ESP32, Arduino, Raspberry Pi, etc.
This article lists and compares the cost and performance of various common and low cost methane sensor solutions available in the market.
The PCB Artists methane sensor is a tiny, low power sensor with I2C interface. This article lists I2C registers for the sensor module.