---
title: Network and RPC
description: Configure Radius RPC endpoints, chain IDs, explorer and faucet links, API key usage, and fee-aware client behavior for each network.
---
# Network and RPC

*Endpoints, limits, and integration guidance*


Use this page to configure wallets and apps for Radius. It includes network values, RPC behavior, rate limits, and fee configuration patterns.

## Network configuration

### Radius Network

| Setting             | Value                                       |
| ------------------- | ------------------------------------------- |
| **Network name**    | Radius Network                              |
| **RPC endpoint**    | https://rpc.radiustech.xyz                           |
| **Chain ID**        | 723487                          |
| **CAIP-2**          | eip155:723487                             |
| **Currency symbol** | RUSD                              |
| **Explorer**        | https://network.radiustech.xyz                     |
| **Faucet**          | Not available on mainnet (Dashboard or API) |

### Radius Testnet

| Setting                | Value                                                                                                                 |
| ---------------------- | --------------------------------------------------------------------------------------------------------------------- |
| **Network name**       | Radius Testnet                                                                                                        |
| **RPC endpoint**       | https://rpc.testnet.radiustech.xyz                                                                                                     |
| **Chain ID**           | 72344                                                                                                    |
| **CAIP-2**             | eip155:72344                                                                                                       |
| **Currency symbol**    | RUSD                                                                                                        |
| **Explorer**           | https://testnet.radiustech.xyz                                                                                               |
| **Faucet (Dashboard)** | <a href={`$https://testnet.radiustech.xyz$/wallet`}>{`$https://testnet.radiustech.xyz$/wallet`}</a> |
| **Faucet (API)**       | https://testnet.radiustech.xyz/api/v1/faucet                                                                                              |

## Add Radius to a wallet

### MetaMask

1. Open MetaMask and select **Add network**.
2. Enter the values from the table above.
3. Save and switch to the Radius network you configured.

### Programmatic setup (viem)

Use the Radius chain definition from [Tooling configuration — chain definition](/developer-resources/tooling-configuration#chain-definition). No fee overrides are needed — viem's built-in estimation works with Radius.

### Terminal and agent setup (radius-cli)

Use `radius-cli` for local wallet and agent execution. Set the network explicitly because the CLI defaults to mainnet:

```bash
RADIUS_HOME=.radius RADIUS_NETWORK=testnet RADIUS_RPC_URL={TESTNET_RPC_URL} \
  RADIUS_SBC_ADDRESS={FEE_CONTRACT} \
  radius-cli wallet balance --json
```

For command examples, see [radius-cli](/developer-resources/radius-cli).

## RPC endpoints and transport

- **HTTP RPC:** Use the endpoint values in the network tables.
- **WebSocket RPC:** Requires an RPC key with elevated privileges.

For WebSocket access requests, use the <a href="https://www.radiustech.xyz/contact">Radius contact form</a>.

## API keys and rate limiting

Radius tracks request volume per API key.

- Requests without an API key have lower limits.
- Default API key limit is **10 MGas/s**.
- For higher limits, use the <a href="https://www.radiustech.xyz/contact">Radius contact form</a>.

In this context, “MGas” includes both RPC calls and gas consumed by submitted transactions.

### Avoid throttling

1. Reuse API keys consistently per environment.
2. Add client-side retry with exponential backoff for `429`-style responses.
3. Cache frequent read requests where possible.
4. Batch reads with Multicall3 when practical.
5. Queue and smooth bursty traffic instead of sending spikes.

### RPC key URL format

Append your API key to the RPC URL path:

<code>https://rpc.radiustech.xyz/YOUR_API_KEY</code>

## JSON-RPC behavior to account for

Radius is EVM compatible, but some methods differ from Ethereum behavior:

- `eth_blockNumber` returns the current timestamp in milliseconds
- `eth_getBalance` returns native balance plus convertible USD balance
- `eth_gasPrice` returns the fixed network gas price
- `eth_feeHistory` returns a pseudo-supported response

See [JSON-RPC API](/developer-resources/json-rpc-api) for method details and [Ethereum compatibility](/developer-resources/ethereum-compatibility) for rationale.

## Get testnet funds

Use the <a href={`$https://testnet.radiustech.xyz$/wallet`}>Radius testnet faucet</a> (Dashboard) to claim SBC tokens with a point-and-click interface.

For programmatic and agent access, use [Create and Fund a Wallet](/get-started/create-and-fund-wallet). The agentic faucet flow is available on testnet only — use the Dashboard or bridge stablecoins for mainnet.

## x402 facilitator endpoints

Use the Radius facilitator for [x402](/developer-resources/x402-integration) payment settlement. Each network has a dedicated facilitator URL.

| Network                  | Facilitator URL                  | CAIP-2 identifier |
| ------------------------ | -------------------------------- | ----------------- |
| Radius Network (mainnet) | https://facilitator.radiustech.xyz | eip155:723487   |
| Radius Testnet           | https://facilitator.testnet.radiustech.xyz | eip155:72344   |

For integration patterns, see [x402 integration](/developer-resources/x402-integration). For the facilitator API reference, see [x402 facilitator API](/developer-resources/x402-facilitator-api).

## Related pages

- [JSON-RPC API](/developer-resources/json-rpc-api)
- [Fees](/developer-resources/fees)
- [Contract addresses](/developer-resources/contract-addresses)
- [Ethereum compatibility](/developer-resources/ethereum-compatibility)