What is a stablecoin?

A digital token, recorded on a blockchain, whose issuer promises to redeem it for a fixed amount of ordinary money, such as one U.S. dollar.

How does it work?

The GENIUS Act defines a payment stablecoin as a digital asset used, or designed to be used, for payment or settlement. Its issuer must convert or redeem it for a fixed amount of monetary value and says it will keep a stable value. It is not a bank deposit or a security. On October 21, 2026 the OCC issued its final rule for issuers under its jurisdiction, with standards for reserve backing, redemption and risk management. The rule and the Act take effect January 18, 2027. Anti-money-laundering and sanctions rules come separately with Treasury.

Why does it matter in finance ops?

Stablecoin settlement is turning up inside finance tools. SAP Pay supports stablecoin-based settlement for cross-border payments from inside SAP Cloud ERP. Mastercard’s agent payments work runs through BVNK, which settles in fiat or stablecoins. The Machine Payments Protocol covered in Agents Can Pay. They Can’t Buy. supports stablecoins on several chains alongside tokenized cards.

Once a rail shows up as an option in a payment run, someone will turn it on. Treasury policy must say which issuers you accept, who approves exposure, and how holdings, redemptions and settlement timing are accounted for at close.

Where has it come up?

• U.S. stablecoins get a federal rulebook starting January 18
• SAP becomes a payment provider inside its own ERP
• Mastercard opens early access to payments between AI agents and APIs

Which essays cover it?

• Agents Can Pay. They Can't Buy. An MPP Update?

Which terms are related?

• agentic commerce

@misc{couch2026whatisastablecoin,
  author = {Couch, Chris},
  title = {What is a stablecoin?},
  year = {2026},
  howpublished = {Ends at Cash},
  url = {https://chriscouch.ai/what-is/stablecoin/}
}