> ## Documentation Index
> Fetch the complete documentation index at: https://docs.4mica.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Supported networks

> List the networks and identifiers supported by 4Mica.

4Mica uses <Tooltip headline="CAIP-2" tip="Chain Agnostic Improvement Proposal 2: a standard format for identifying blockchain networks, such as eip155:8453 for Base.">CAIP-2</Tooltip> network IDs so buyers, sellers, SDKs, and facilitator calls all refer to the same chain.

Use the network ID in payment requirements, SDK configuration, and scheme registration. Use the API URL when your server talks to the 4Mica facilitator for that network.

## Values

```txt theme={null}
Base
Network ID: eip155:8453
API URL: https://base.api.4mica.xyz/
Use for: Production

Base Sepolia
Network ID: eip155:84532
API URL: https://base.sepolia.api.4mica.xyz/
Use for: Development, examples, demos, and integration testing

Ethereum Sepolia
Network ID: eip155:11155111
API URL: https://ethereum.sepolia.api.4mica.xyz/
Use for: Ethereum testnet compatibility and cross-network testing
```

## Choosing a network

* Start with **Base Sepolia** for most development work.
* Use **Ethereum Sepolia** only when your test flow needs Ethereum Sepolia.
* Use **Base** when you are ready for production traffic.