> For the complete documentation index, see [llms.txt](https://docs.seismic.systems/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.seismic.systems/reference/deterministic-deployments.md).

# Deterministic Deployments

Seismic provides common infrastructure contracts at addresses shared with other EVM networks. These contracts are deployed after the chain starts using ordinary transactions whose senders, nonces, and creation code produce the same addresses on every compatible network.

They are not [genesis predeploys](/reference/predeploys.md). A deterministic contract is unavailable until its deployment transaction has been included, and its deployment produces normal transaction history and a receipt.

{% hint style="info" %}
Availability can differ between Seismic networks. Use `eth_getCode` to confirm that a contract is installed before depending on it.
{% endhint %}

## Addresses

| Contract                            | Address                                      |
| ----------------------------------- | -------------------------------------------- |
| Create2 — Nick's method             | `0x4e59b44847b379578588920cA78FbF26c0B4956C` |
| ERC-1820 Registry                   | `0x1820a4B7618BdE71Dce8cdc73aAB6C95905faD24` |
| SingletonFactory (ERC-2470)         | `0xce0042B868300000d44A59004Da54A005ffdcf9f` |
| Multicall3                          | `0xcA11bde05977b3631167028862bE2a173976CA11` |
| Deterministic Deployment Proxy      | `0x7A0D94F55792C434d74a40883C6ed8545E406D12` |
| Inefficient ImmutableCreate2Factory | `0xcfA3A7637547094fF06246817a35B8333C315196` |
| ImmutableCreate2Factory             | `0x0000000000FFe8B47B3e2130213B802212439497` |
| Permit2                             | `0x000000000022D473030F116dDEE9F6B43aC78BA3` |
| CreateX                             | `0xba5Ed099633D3B313e4D5F7bdc1305d3c28ba5Ed` |

These contracts provide shared deployment factories, interface discovery, batched reads and calls, and token approval infrastructure. Keeping their canonical addresses makes applications and deployment tooling portable across EVM networks.

{% hint style="warning" %}
The contracts with “Proxy” in their names are deterministic **deployment** utilities. They are not upgradeability proxies for Seismic's genesis contracts.
{% endhint %}

## Verify a deployment

Check an address before using it:

```bash
cast code \
  0xcA11bde05977b3631167028862bE2a173976CA11 \
  --rpc-url "$SEISMIC_RPC_URL"
```

An installed contract returns non-empty bytecode. `0x` means no contract is currently deployed at that address on the selected network.


---

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