Glossary
What is a stablecoin, and why do agents use USDC?
A stablecoin is a token designed to keep a fixed value against a currency. Why agent payment tools use dollar stablecoins such as USDC.
A stablecoin is a blockchain token designed to keep a stable value relative to a reference asset, usually a currency such as the US dollar; USDC is a dollar stablecoin issued by Circle.
How does it work?
Circle describes USDC as fully reserved and redeemable 1:1 for US dollars. For software that pays, a dollar-denominated token has a practical advantage: limits can be exact. A rule like 'no more than 5 per payment' means the same thing tomorrow, without a live price feed. Stablecoins also settle programmatically, at any hour, to any valid address on the network, which suits agents that run unattended. Each chain has its own contract for the token, so 'USDC' on one network is not the same contract as on another.
In practice
Check the network and the contract address, not just the name. Circle publishes the official USDC contract addresses per chain. Sending to an address on a different network, or using a token that only calls itself USDC, is a common way to lose funds. On Base, sending USDC also needs a little ETH to pay gas, unless someone else, such as a facilitator or relayer, submits the transaction for you.
What it does not mean
- A stablecoin is not a bank deposit, and a fixed target value isn't a guarantee from this page. Read the issuer's own terms.
- USDC on one chain isn't automatically usable on another.
- A token with "USD" in its name is not necessarily a stablecoin, or the one you meant. The contract address is what identifies it.
- Nothing here is advice to buy or hold any asset.
Where does Veyra fit?
Veyra supports USDC on Base only, using Circle's USDC contract on Base mainnet. Its docs explain the choice: that is where the agent-payment ecosystem it targets already operates, and a single stablecoin keeps policy limits exact. Approvals also need a little ETH on Base for gas. Policy limits are written in USDC, so a cap of 5 means 5 USDC.
Sources
Guides that use this term
- Custodial vs non-custodial wallets for AI agentsWho holds the money and the keys when an AI agent pays: custodial balances, agent-held keys, and owner wallets with delegated limits compared.
- Is it safe to approve a token allowance for an AI agent?What an ERC-20 allowance does and doesn't limit when it powers an agent's unattended payments, and how to size and constrain one.
This page explains how agent payments and the related technology work. It is not financial, investment, legal or tax advice. Protocols and provider features change; check the linked official sources before relying on a detail.