Harvesting tether microfuds refers to the process of exchanging USDT (Tether) for other digital currencies, such as USDC (Circle Swap) or BTC (Kraken and Binance). To do this, you would first need to exchange your USDT for USDC on Circle Swap, then deposit the USDC into Kraken or Binance. From there, you can then trade your USDC for other digital currencies, such as BTC. This process of exchanging USDT for other digital currencies is known as harvesting tether microfuds.