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AML check on Sei

Sei is a fast, EVM-compatible layer 1 where one wallet key can appear as two addresses, sei1... and 0x.... Under SIP-3 it is moving to 0x-only addresses.

Address formatTwo forms from one key: sei1… (Bech32) and 0x… (EVM, 40 hex) — 0x is becoming the main format0xc703de289bb65537a64ad11891c59eaeba37688fExample for illustration, not a real address.
Note

One Sei user can show up under two different-looking addresses, so a check on only one of them may miss activity on the other, especially before the two are linked on-chain. Sei is retiring its sei1 (Cosmos) side under SIP-3, so 0x addresses are now the main format to screen.

Services that check Sei

01EllipticEnterprise platformPrice on requestSupportedNot scored
02TRM LabsEnterprise platformPrice on requestSupportedNot scored
03WebacyUse with careAPI for businessPrices shown after sign-inSupportedNot scored
04Merkle ScienceEnterprise platformPrice on requestNot verifiedNot scored

How to check a Sei address

  1. Get the public addressAsk your counterparty for the address they will send from — or copy it from the incoming transaction.
  2. Pick a service that covers SeiChoose one marked “Supported” in the list above. If you have a sei1... address, also find its matching 0x... address (it comes from the same key) and check both, because they can carry separate activity until they are linked.
  3. Run the check and read itCheck an address before you send: Sei treats transactions as final in about 400 ms, so there is no waiting period in which to spot a mistake.
A real AML check needs only a public address. Never share a seed phrase or private key.

Sei specifics

  • Every Sei account has two addresses made from the same key: a sei1... address and a 0x... address. Sei links them automatically once the account's public key is recorded on-chain, for example after it sends a transaction. Until then, the two are treated as separate accounts with separate balances.[1]
  • Sei says a transaction is final as soon as its block is committed, within a target block time of about 400 milliseconds, with no multi-block wait.[2]
  • In May 2025 the Sei community accepted SIP-3, a proposal to retire Sei's CosmWasm and native Cosmos transactions so that Sei becomes an EVM-only chain where only 0x (EVM) addresses can start transactions.[3]
  • Sei's 'pointer contracts' let a token created on one side (Cosmos/CosmWasm or EVM) be used from the other. Sei now calls them primarily a legacy and migration tool, since governance Proposal 115 stopped new CosmWasm contracts from being deployed.[4]
  • Circle lists Sei among the blockchains with native USDC, and Sei has told holders of the older bridged USDC.n to move to native USDC or risk losing access to those assets.[5]

Common risks on Sei

Stolen fundsHighCoins taken in hacks of exchanges, protocols or personal wallets.DeFi protocolLowEstablished on-chain lending, swaps and liquidity pools.ScamHighMoney taken through fake investments, phishing, impersonation and similar deception.SanctionsHighAddresses on government sanctions lists or owned by listed entities.

FAQ

Why does one Sei wallet have two addresses?

Sei makes a sei1... address and a 0x... address from the same key, using two different hashing methods. Once the account's public key is recorded on-chain (for example after it sends a transaction), Sei links the two. Before that, they are treated as separate accounts with separate balances.

Can I still use a sei1... address?

Sei is moving to an EVM-only design under SIP-3, which its community accepted in May 2025, and 0x addresses are becoming the main format. Check Sei’s current docs for the latest status of the Cosmos side before relying on a sei1 address, and make sure your exchange supports it.

Is USDT or USDC native on Sei?

Tether's list of supported blockchains does not include Sei. Circle lists Sei among the chains with native USDC, and Sei has told holders of the older bridged version (USDC.n) to move to native USDC.

How do I check a Sei address for AML risk?

Copy the public address, open one of the services listed above that supports Sei, and run the check. You never need a seed phrase or private key.

What does “Not verified” mean?

The service claims support somewhere — in marketing copy or a third-party page — but its own docs, pricing or FAQ do not list the network. Treat it as unknown.

Sources

  1. Sei (docs.sei.io) — Sei Network Accounts: Dual Address System Explained. Checked 4 Oct 2026.
  2. Sei (docs.sei.io) — Twin Turbo Consensus: Sei's High-Speed Blockchain Consensus. Checked 4 Oct 2026.
  3. Sei (blog.sei.io) — The SIP-3 Upgrade: Making Way for Sei Giga (16 Jan 2026). Checked 4 Oct 2026.
  4. Sei (docs.sei.io) — Sei Pointer Contracts: Bridging EVM and Cosmos Environments. Checked 4 Oct 2026.
  5. Circle — USDC on multiple blockchains. Checked 4 Oct 2026.