Zamp (Varni Labs Inc) is a registered investment advisor with the SEC, that has built a treasury management platform for businesses. With Zamp, you can invest your surplus cash in high-yield US Treasury Bills and Notes, backed by the full faith and credit of the United States government, with a 1 click deployment/withdrawal.

Zamp will require your company’s official formation documents, relevant tax details of the company, and the government ID of the authorized signatory; Zamp supports both US and non-US companies.

Signup takes less than 10 minutes. If the documents are in place, the account will get approved within 24 hours.

Brokerage accounts hold securities such as stocks, bonds, and mutual funds and some cash. A bank account only holds cash deposits. A bank account lets you write checks and use a debit card. Some brokerage accounts also provide a debit card and allow you to write checks.
‍
Many bank accounts are FDIC-insured for up to $250,000. Brokerage accounts usually have SIPC protection (of up to $500,000), which can help recover some value of such accounts if a brokerage goes under. In addition, registered brokerage firms must keep their customers' securities and cash segregated from their own so that, even if a firm fails, its customers' assets will be safe.

U.S. Treasury Securities are debt instruments. The U.S. Department of the Treasury issues Securities to raise the money needed to operate the federal government.

Treasury securities are considered a safe and secure investment option because the full faith and credit of the U.S. government guarantees that interest and principal payments will be paid on time. Also, most Treasury securities are liquid, which means they can easily be sold for cash. Treasury instruments are transferable, so you can buy or sell them in the secondary market.  

For treasury bills, the only interest payment to you occurs when your bill matures. At that time, you are paid the par amount (also called face value) of the bill. (Bills are typically sold at a discount from the par amount, and the difference between the purchase price and the par amount is your interest.). 
‍
Treasury Notes pay interest every six months until maturity, at which point you will receive the face value of the note.

U.S. Treasuries are amongst the most liquid traded assets. You can liquidate (sell) your U.S. Treasuries during regular trading hours.