> ## Documentation Index
> Fetch the complete documentation index at: https://na-36-mintlify-aebde2c5.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Arbitrum RPCs

> Arbitrum One RPC endpoint options for Livepeer orchestrators – provider comparison, rate limits, and configuration.

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Livepeer orchestrators require an Arbitrum One RPC endpoint to interact with the protocol – staking, reward calls, ticket redemption, and service registration all happen on Arbitrum. The endpoint is configured via the `-ethUrl` flag.

<CustomDivider />

## Requirements

Your RPC endpoint must:

* Connect to **Arbitrum One** (chain ID `42161` / `0xa4b1`) – not Ethereum L1
* Support standard JSON-RPC methods (`eth_call`, `eth_sendRawTransaction`, `eth_getBlockByNumber`, `eth_getLogs`)
* Handle the request volume your orchestrator generates – active orchestrators with frequent reward calls and ticket redemptions may exceed free-tier limits

<CustomDivider />

## Provider Options

<StyledTable variant="bordered">
  <TableRow header>
    <TableCell header>Provider</TableCell>
    <TableCell header>Free Tier</TableCell>
    <TableCell header>Rate Limit (free)</TableCell>
    <TableCell header>Notes</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>[Alchemy](https://www.alchemy.com/)</TableCell>
    <TableCell>Yes</TableCell>
    <TableCell>300 CU/s (\~100 req/s)</TableCell>
    <TableCell>Most commonly used by orchestrators. Arbitrum One supported natively.</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>[Infura](https://www.infura.io/)</TableCell>
    <TableCell>Yes</TableCell>
    <TableCell>100k req/day</TableCell>
    <TableCell>Requires separate Arbitrum add-on in dashboard.</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>[Ankr](https://www.ankr.com/)</TableCell>
    <TableCell>Yes (public)</TableCell>
    <TableCell>Shared, best-effort</TableCell>
    <TableCell>Public endpoint: `https://rpc.ankr.com/arbitrum`. No API key needed.</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>[QuickNode](https://www.quicknode.com/)</TableCell>
    <TableCell>Paid</TableCell>
    <TableCell>Varies by plan</TableCell>
    <TableCell>Low-latency option for high-volume orchestrators.</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>[Chainstack](https://chainstack.com/)</TableCell>
    <TableCell>Yes</TableCell>
    <TableCell>25 req/s</TableCell>
    <TableCell>Arbitrum One supported.</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>[Public Arbitrum RPC](https://arb1.arbitrum.io/rpc)</TableCell>
    <TableCell>Yes</TableCell>
    <TableCell>Shared, rate-limited</TableCell>
    <TableCell>Official Arbitrum public endpoint. Suitable for testing only – not recommended for production orchestrators.</TableCell>
  </TableRow>
</StyledTable>

<CustomDivider />

## Configuration

Set the endpoint when starting your orchestrator:

```bash icon="terminal" theme={"theme":{"light":"github-light","dark":"dark-plus"}}
livepeer \
  -network arbitrum-one-mainnet \
  -ethUrl https://arb-mainnet.g.alchemy.com/v2/YOUR_API_KEY \
  -orchestrator \
  -transcoder \
  ...
```

### Verify Your Endpoint

Test that the endpoint is reachable and returns the correct chain ID:

```bash icon="terminal" theme={"theme":{"light":"github-light","dark":"dark-plus"}}
curl -X POST -H "Content-Type: application/json" \
  --data '{"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1}' \
  YOUR_ETH_URL
```

Expected response includes `"result":"0xa4b1"` (42161 in decimal = Arbitrum One).

<CustomDivider />

## Common Issues

<StyledTable variant="bordered">
  <TableRow header>
    <TableCell header>Problem</TableCell>
    <TableCell header>Cause</TableCell>
    <TableCell header>Fix</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>`dial tcp: connection refused`</TableCell>
    <TableCell>Wrong URL or provider down</TableCell>
    <TableCell>Verify URL, test with `curl`, try alternate provider</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>`could not retrieve chain ID`</TableCell>
    <TableCell>Using Ethereum L1 endpoint instead of Arbitrum</TableCell>
    <TableCell>Switch to an Arbitrum One endpoint</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>`context deadline exceeded`</TableCell>
    <TableCell>Rate-limited or slow provider</TableCell>
    <TableCell>Upgrade plan or switch provider</TableCell>
  </TableRow>

  <TableRow>
    <TableCell>Reward calls failing intermittently</TableCell>
    <TableCell>Free-tier rate limit hit during peak</TableCell>
    <TableCell>Upgrade to paid tier or use a dedicated node</TableCell>
  </TableRow>
</StyledTable>

For detailed troubleshooting, see the [FAQ](/v2/orchestrators/resources/faq#arbitrum-rpc-connection-failing--node-will-not-start).

<CustomDivider />

## See Also

<CardGroup cols={3}>
  <Card title="Arbitrum Exchanges" href="/v2/orchestrators/resources/arbitrum-exchanges" icon="coins" />

  <Card title="Contract Addresses" href="/v2/orchestrators/resources/technical/x-contract-addresses" icon="file-contract" />

  <Card title="FAQ" href="/v2/orchestrators/resources/faq" icon="circle-question" />
</CardGroup>