> ## Documentation Index
> Fetch the complete documentation index at: https://docs.algovoi.co.uk/llms.txt
> Use this file to discover all available pages before exploring further.

# Chains overview

> AlgoVoi's seven supported chains compared: stablecoins, confirmation times, fees, and the memo, reference pubkey and amount only binding mechanisms.

AlgoVoi supports seven chains today. They split into three families based on how transactions are bound to specific checkouts.

## The seven

| Chain                        | Family           | Native | Stablecoin    | Confirmation | Fee               |
| ---------------------------- | ---------------- | ------ | ------------- | ------------ | ----------------- |
| [Algorand](/chains/algorand) | Memo             | ALGO   | USDC ASA      | \~5s         | sub-cent          |
| [VOI](/chains/voi)           | Memo             | VOI    | aUSDC ARC-200 | \~5s         | sub-cent          |
| [Hedera](/chains/hedera)     | Memo             | HBAR   | USDC HTS      | \~5s         | \$0.0001          |
| [Stellar](/chains/stellar)   | Short memo       | XLM    | USDC issuer   | \~5s         | sub-cent          |
| [Base](/chains/base)         | Amount-only      | ETH    | USDC ERC-20   | \~2s         | \$0.001 to \$0.05 |
| [Solana](/chains/solana)     | Reference pubkey | SOL    | USDC SPL      | under 1s     | \$0.00025         |
| [Tempo](/chains/tempo)       | Amount-only      | ETH    | USDCe TIP-20  | \~2s         | sub-cent          |

## Binding mechanisms

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

### 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.

### Short text memo (Stellar)

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

### Reference pubkey (Solana)

Solana doesn't have arbitrary memos, so AlgoVoi uses [Solana Pay's reference mechanism](/protocols/solana-actions). 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)`.

### Amount-only (Base, Tempo)

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.

## Stablecoin notes

| Chain            | Stablecoin | On-chain identifier                                             |
| ---------------- | ---------- | --------------------------------------------------------------- |
| Algorand mainnet | USDC       | ASA `31566704`                                                  |
| VOI mainnet      | aUSDC      | ARC-200 `302190`                                                |
| Hedera mainnet   | USDC       | HTS `0.0.456858`                                                |
| Stellar mainnet  | USDC       | `USDC:GA5ZSEJYB37JRC5AVCIA5MOP4RHTM335X2KGX3IHOJAPP5RE34K4KZVN` |
| Base mainnet     | USDC       | ERC-20 `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`             |
| Solana mainnet   | USDC       | SPL mint `EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v`         |
| Tempo mainnet    | USDCe      | TIP-20 `0x20c000000000000000000000b9537d11c60e8b50`             |

USDC has 6 decimals on every chain except Stellar (7 decimals).

## 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.

## 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.

## See also

* Per-chain detail pages, one per chain in the navigation under **Chains**
* [x402 protocol](/protocols/x402) for the multi-chain quote shape