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

# ARC Network RPC and Chain ID

> ARC Network testnet RPC (rpc.testnet.arc.io, formerly rpc.testnet.arc.network), chain ID 5042002, native-USDC gas, and EVM wallet setup for MetaMask and Rabby. ARC mainnet (chain ID 5042) is expected September 2026; AlgoVoi's Arc settlement support ships now.

The ARC Network testnet RPC endpoint is `https://rpc.testnet.arc.io` and its chain ID is
`5042002`, with USDC as the native gas token. The full testnet config and EVM wallet setup are
below. **ARC mainnet goes live 16 September 2026**, and AlgoVoi is ready for go-live from day one. Only ARC Testnet is available today, so every value on
this page is a testnet value.

<Note>
  **Arc is AlgoVoi's eighth chain: AlgoVoi is ready for its go-live on 16 September 2026.** Arc mainnet is not open yet
  (testnet only today), so AlgoVoi settles live payments on its seven live mainnet chains for now
  (see [Chains overview](/concepts/chains-overview)). AlgoVoi's Arc settlement, finality
  verification and recurring-pull support are built in and ship in the Payment Rails bundle now;
  they activate when Arc mainnet opens, expected September 2026. Until then, the ARC Testnet
  verifier (chain ID 5042002) is available for development and interop testing.
</Note>

## ARC Testnet RPC endpoint and chain ID

|                     | ARC Testnet                                                                      |
| ------------------- | -------------------------------------------------------------------------------- |
| Network ID          | `arc_testnet`                                                                    |
| Chain ID            | `5042002`                                                                        |
| RPC                 | `https://rpc.testnet.arc.io` (legacy `rpc.testnet.arc.network` still resolves)   |
| Native asset        | USDC                                                                             |
| Native decimals     | 18                                                                               |
| Stablecoin          | USDC (native — same token as gas)                                                |
| Stablecoin address  | `0x3600000000000000000000000000000000000000`                                     |
| Stablecoin decimals | 18 on-chain (AlgoVoi converts internally)                                        |
| Confirmation time   | \~2 seconds                                                                      |
| Typical fee         | Paid in USDC (sub-cent on testnet)                                               |
| Mainnet             | Chain ID `5042` — expected September 2026 (AlgoVoi settlement support ships now) |

<Info>
  ARC is purpose-built for programmable money. USDC is the **native gas token** — you pay transaction fees in USDC, not in a separate ETH-like asset. This eliminates the dual-token gas problem common on other chains.
</Info>

## ARC mainnet status

**ARC mainnet is expected in September 2026**, when AlgoVoi's Arc settlement activates. As of
2026-08 Circle has not yet published the public ARC mainnet RPC endpoint (AlgoVoi targets chain
ID `5042`). The [ARC Network docs](https://docs.arc.io) confirm that "the values on
this page apply to the Arc Testnet" and that "mainnet endpoints and parameters are published
separately when available." ARC Testnet (chain ID `5042002`, RPC `https://rpc.testnet.arc.io`)
is the only network available today. Use the testnet values above for all development, and check the
[ARC Network docs](https://docs.arc.io) for mainnet launch announcements.

## Amount-only binding

ARC is EVM-compatible. Like [Base](/chains/base) and [Tempo](/chains/tempo), ERC-20 transfers carry no memo field, so AlgoVoi binds checkouts by amount uniqueness. Send the exact `amount_microunits` from the checkout response and do not round.

## USDC decimals — important

On-chain ARC USDC uses **18 decimal places** (unlike 6 dp on every other chain). AlgoVoi's verifier handles this scaling automatically — amounts in the API and checkout response are always in the standard 6 dp micro-unit format. You never need to scale yourself.

## Wallets

Any EVM wallet works, configured for ARC Testnet:

* [AlgoVoi Chrome extension](https://chromewebstore.google.com/detail/algovoi/ofmgegnkjdmbeakjbmfaagigmhagdcbl) (in-house wallet, native x402 / MPP / AP2 on ARC via viem `signTransaction` + native value transfer — Arc's native gas token is USDC; six-chain coverage as of v2.6.0)
* [MetaMask](https://metamask.io) — add network manually (chain ID `5042002`, RPC `https://rpc.testnet.arc.io`)
* [Rabby](https://rabby.io)
* [WalletConnect](https://walletconnect.com)

Fund testnet wallets at [faucet.circle.com](https://faucet.circle.com) — select **ARC Testnet**.

## ERC-8004 onchain agent identity

ARC defines [ERC-8004](https://docs.arc.io/build/agentic-economy), a standard for registering AI agents as onchain identities with reputation and credential verification.

AlgoVoi is registered on ARC Testnet as an ERC-8004 agent:

|                          |                                                                                                                       |
| ------------------------ | --------------------------------------------------------------------------------------------------------------------- |
| Agent ID (ERC-721 token) | `5938`                                                                                                                |
| Registry                 | `0x8004A818BFB912233c491871b3d84c89A494BD9e`                                                                          |
| Reputation registry      | `0x8004B663056A597Dffe9eCcC1965A193B7388713`                                                                          |
| Validation registry      | `0x8004Cb1BF31DAf7788923b405b754f57acEB4272`                                                                          |
| Metadata URI             | `https://api.algovoi.co.uk/.well-known/agent.json`                                                                    |
| Reputation tag           | `a2a_payment_gateway`                                                                                                 |
| Validation tag           | `a2a_verified` (score 100 — passed)                                                                                   |
| Explorer                 | [arcscan.app token #5938](https://testnet.arcscan.app/token/0x8004A818BFB912233c491871b3d84c89A494BD9e/instance/5938) |

This makes AlgoVoi discoverable as a payment agent within ARC's agentic economy — any resolver that reads the ERC-721 tokenURI finds our A2A endpoint, compliance attestation, and supported chain list.

## ERC-8183 job settlement (Tier 3)

ARC also defines [ERC-8183](https://docs.arc.io/build/agentic-economy) for USDC-escrow job settlement between agents. AlgoVoi plans to support ERC-8183 job settlement in a future release, enabling agent-to-agent payment flows with onchain escrow and conditional release.

## Agentic protocols

ARC Testnet is fully supported by AlgoVoi's protocol stack:

| Protocol                | Status                                           |
| ----------------------- | ------------------------------------------------ |
| [x402](/protocols/x402) | Supported                                        |
| [MPP](/protocols/mpp)   | Supported (EVM method, chain ID 5042002)         |
| [A2A](/protocols/a2a)   | Supported — AlgoVoi registered as ERC-8004 agent |

## See also

* [Base](/chains/base) and [Tempo](/chains/tempo) for other EVM chains
* [A2A protocol](/protocols/a2a) for agent-to-agent payment flows
* [ARC Network docs](https://docs.arc.io/build/agentic-economy) for ERC-8004 and ERC-8183 specs