Chains overview

The AlgoVoi gateway supports seven checkout chains live today, with Arc (Circle’s USDC-native L1) settling from September 2026 for eight in total. They split into three families based on how transactions are bound to specific checkouts.

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The chains

Arc is Circle’s USDC-native EVM L1 (chain ID 5042). Its mainnet RPC is not live yet: AlgoVoi’s Arc settlement, verification and recurring-pull support ship in the bundle now and go live when Arc mainnet opens in September 2026. Arc testnet (chain ID 5042002) is available today.

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Binding mechanisms

How AlgoVoi knows that a specific on-chain transaction satisfies a specific checkout:

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Memo binding (Algorand, VOI, Hedera)

Transactions carry a note or memo field. AlgoVoi puts algovoi:{token} in the memo. The verifier matches by memo content.

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Short text memo (Stellar)

Same as memo binding, but Stellar caps MEMO_TEXT at 28 bytes. AlgoVoi uses a shortened av:{token[:20]} form.

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Reference pubkey (Solana)

Solana doesn’t have arbitrary memos, so AlgoVoi uses Solana Pay’s reference mechanism. A fresh ed25519 pubkey is generated per checkout and included as a non-signer account in the transaction. The verifier looks up the settling tx via getSignaturesForAddress(reference).

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Amount-only (Base, Tempo, Arc)

EVM ERC-20 / TIP-20 transfers don’t carry memos. AlgoVoi binds checkouts by amount uniqueness: each checkout’s amount is slightly randomised so two open checkouts for the same target amount can be distinguished.

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Stablecoin notes

USDC has 6 decimals on every chain except Stellar (7 decimals) and Arc, where USDC is the native gas token with 18 decimals.

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Native asset support

Every chain also supports native-asset payments (ALGO, VOI, HBAR, XLM, ETH, SOL). Native payments are less common because the price is volatile, but they’re useful for chain-only environments where stablecoin issuance hasn’t arrived yet.

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Picking a chain

If you’re starting from zero:

• Cheapest fees: Solana ($0.00025) or Algorand ($0.0002)
• Fastest confirmation: Solana (sub-second) or Base / Tempo (~2s)
• Most existing wallets: Base (any EVM wallet) or Solana (Phantom et al)
• If your customers already have tokens on a specific chain: just enable that chain

For a multi-chain offer, configure two or three payouts and let the customer choose at checkout.

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See also

• Per-chain detail pages, one per chain in the navigation under Chains
• x402 protocol for the multi-chain quote shape