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Stablecoin · checked 9 November 2026

Agent payment safety checks for USDT

USDT is Tether's stablecoin, live on a fixed list of chains, with some chains deprecated and Tether holding freeze and blacklist powers.

What your agent needs to know about USDT

When it counts as settled
USDT has no finality of its own. It settles with the chain it sits on, so use that chain's rule. Tether's pages describe no Circle-style burn-and-mint transfer product, and USDT0 moves by lock-and-mint, so for any move between chains the agent should treat the result as unsettled until the destination chain confirms it.[1],[3]
Fees
Fees are the host chain's. On Tron, for example, a TRC-20 transfer costs energy or burns TRX. Tether's pages list no separate per-transfer fee.[1]
Stablecoins
Tether's Supported Protocols page lists USDT on Ethereum, Avalanche, Kava (Cosmos), Celo and Kaia as ERC-20, plus TRC-20 on Tron, Liquid, Solana, Polkadot AssetHub, Tezos, NEAR, TON and Aptos. It lists Algorand, EOS/Vaulta, Kusama AssetHub, Omni and Bitcoin Cash SLP as deprecated, with Tether no longer issuing or obligated to redeem there. Tether's legal page says redemptions on Omni, Bitcoin Cash SLP, Kusama, EOS and Algorand stopped on 1 September 2025. Tether's terms allow it to freeze tokens and blacklist addresses. USDT0 is a separate Tether-branded token: its docs say USDT is locked in an adapter contract on Ethereum and USDT0 is minted on the destination chain (lock-and-mint, OFT standard). Treat USDT0 and other wrapped versions as different tokens from USDT, and check the contract against the issuer's own list for that chain.[1],[2],[3]
Issuer-published contract addresses. Compare all of it, not the first and last characters.
TokenAddressSource
USDT on Tron (TRC-20)TR7NHqjeKQxGTCi8q8ZY4pL8otSzgjLj6t[1]
USDT on Solana (mint)Es9vMFrzaCERmJfrF4H2FYD4KCoNkY11McCe8BenwNYB[1]
USDT on Aptos (contract)0xf73e887a8754f540ee6e1a93bdc6dde2af69fc7ca5de32013e89dd44244473cb[1]

How agent payments go wrong on USDT

  1. 1. Deprecated chain

    On Algorand, EOS, Kusama AssetHub, Omni and Bitcoin Cash SLP, Tether is no longer issuing or obligated to redeem. An agent that accepts USDT there holds a token that cannot be redeemed with Tether. Block deprecated networks in policy.[1],[2]

  2. 2. Freeze or blacklist of the holder

    Tether may freeze tokens held by an address and blacklist addresses. Funds an agent receives from a flagged counterparty may be frozen later. Keep payouts small and screen counterparties.[2]

  3. 3. Wrong network deposit

    The same ticker exists on many chains with different addresses. Sending USDT on a network the recipient does not support can lose it. Bind every payment to network and contract address.[1]

  4. 4. Lookalike or wrapped token

    Tokens on chains not on Tether's list, or bridge-wrapped tokens, are not issued by Tether. Compare the contract to the address on Tether's supported protocols page.[1]

  5. 5. Redemption needs verification

    Tether's terms say redemption requires an identity-checked customer and a bank account in the customer's name, with possible minimums. An agent cannot count on redeeming directly with Tether.[2]

Pre-flight checklist for a USDT agent

  • Allowlist the USDT contract per network from Tether's supported protocols page.
  • Reject deprecated networks.
  • Pin payments to a network plus contract address, not a ticker.
  • Screen counterparties and limit exposure to freeze risk.
  • Use the host chain's finality rule before fulfilling.

Run the checks now, free

The free tools run in your browser: nothing you type leaves your browser, and wallet reads go only to a public RPC.

  • The Wrong-Money Test

    Write down what happens when your agent pays the wrong amount, the wrong address or the wrong token on USDT, and see whether the answer holds up.

  • Agent Spend-Cap Stress Test

    Work out how much your agents can really move in one window once retries, parallel runs and per-key limits stack up.

  • Agent Money Trace

    Joins on-chain transfers on Base, Ethereum, Arbitrum, OP Mainnet or Polygon to your run log, so every payment maps to a decision.

Want a second pair of eyes on how your agent pays on USDT? Book the free 48-hour integration review (opens Cal.com in a new tab).

Sources

  1. [1] Supported Protocols, Tether
  2. [2] Tether legal terms, Tether
  3. [3] USDT0 technical documentation, USDT0

Checked against these sources on 9 November 2026. Networks change: confirm against the live docs before you rely on a number. This page is a checklist from public documentation. It is not a security audit, legal, compliance or investment advice.