RPC endpoints - Arc Docs

Arc exposes standard Ethereum JSON-RPC endpoints — the same HTTP and WebSocket API that Ethereum nodes use — for submitting transactions, querying state, and subscribing to events. Connect through Circle’s primary endpoint or through a third-party node provider. For details on Arc’s current network phase, see Deployment model.

Testnet endpoints

Provider	HTTP	WebSocket
Primary (Circle)	`https://rpc.testnet.arc.io`	`wss://rpc.testnet.arc.io`
Blockdaemon	`https://rpc.blockdaemon.testnet.arc.io`	—
dRPC	`https://rpc.drpc.testnet.arc.io`	`wss://rpc.drpc.testnet.arc.io`
QuickNode	`https://rpc.quicknode.testnet.arc.io`	`wss://rpc.quicknode.testnet.arc.io`

Network parameters

These parameters identify the Arc Testnet on the Ethereum network and are required when adding Arc to a wallet or development framework.

Parameter	Value
Chain ID	`5042002`
Currency symbol	USDC
Block explorer	testnet.arcscan.app
Gas tracker	testnet.arcscan.app/gas-tracker
Faucet	faucet.circle.com

For an overview of network phases, see Deployment model. For wallet configuration instructions using these parameters, see Connect to Arc.

Node providers

The following infrastructure partners offer managed RPC access to Arc. Each provider supports HTTP endpoints, and most support WebSocket connections. See Node providers for additional details.

Provider	Description
Alchemy	Developer platform with enhanced APIs, monitoring, and debugging tools
Blockdaemon	Institutional-grade node infrastructure with secure, compliant access
dRPC	Decentralized RPC aggregator with load-balanced, multi-provider routing
QuickNode	High-performance global endpoints and blockchain APIs

Supported methods

Arc supports all standard Ethereum JSON-RPC methods. The table below lists commonly used methods by category.

Category	Methods	Notes
State	`eth_getBalance`, `eth_getCode`, `eth_getStorageAt`, `eth_call`
Transactions	`eth_sendRawTransaction`, `eth_getTransactionReceipt`, `eth_getTransactionByHash`
Blocks	`eth_getBlockByNumber`, `eth_getBlockByHash`, `eth_blockNumber`
Gas	`eth_gasPrice`, `eth_estimateGas`, `eth_feeHistory`
Subscriptions	`eth_subscribe`, `eth_unsubscribe`	WebSocket only

For gas fee parameters and best practices for setting maxFeePerGas, see Gas and fees.

The values on this page apply to the Arc Testnet. Mainnet endpoints and parameters are published separately when available.

Troubleshooting

Symptom	Cause	Resolution
`connection refused` or timeout	Incorrect RPC URL or network issue	Verify you are using a URL from the testnet endpoints table. Try an alternate provider.
`invalid chain id`	Wallet or provider configured with the wrong Chain ID	Set the Chain ID to `5042002`.
`insufficient funds`	Account has no USDC for gas	Request testnet USDC from the faucet.

​Testnet endpoints

​Network parameters

​Node providers

​Supported methods

​Troubleshooting

Testnet endpoints

Network parameters

Node providers

Supported methods

Troubleshooting