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

# Arc network

> The chain Puls is built on, and why USDC-as-gas matters.

## Why Arc

Puls runs on **Arc Testnet** — a chain purpose-built for stablecoin-native applications.

The key property: **USDC is the native gas token**. There is no separate volatile gas asset to acquire and manage. For a consumer prediction market, that means one unit of account for everything — your balance, your stake, your fees, and the gas (which Puls sponsors anyway).

## Network details

| Property       | Value                                  |
| -------------- | -------------------------------------- |
| Network        | Arc Testnet                            |
| Chain ID       | `5042002`                              |
| Gas token      | USDC                                   |
| Settlement     | On-chain, per transaction              |
| RPC endpoint   | `https://rpc-testnet.arc.build`        |
| Block explorer | [Arcscan](https://testnet.arcscan.app) |

## Key contract addresses

| Contract         | Address                                      |
| ---------------- | -------------------------------------------- |
| USDC             | `0x29C305FF73EEC78fa99E4F7eB6cE6cF7FD0bAcE5` |
| PredictionMarket | *(deployed per market)*                      |
| AgentBond        | `0xc3bbfccfd885d14898dff697435a090ba5919497` |
| SignalRegistry   | *(attests x402 unlocks)*                     |

## Gas sponsorship

Puls uses Circle Programmable Wallets for all users. We sponsor all gas fees on the network via a Circle gas-station policy. When you place a trade or buy a signal, the app signs the transaction, but the transaction fees are paid by our gas tank. You only spend what you stake.

## Add Arc Testnet to MetaMask

If you want to view your balances outside of Puls, you can add Arc Testnet to your wallet:

<Steps>
  <Step title="Open Wallet Settings">
    In MetaMask, go to **Settings > Networks > Add Network**.
  </Step>

  <Step title="Enter Details">
    Add a network manually with the following information:

    * Network Name: `Arc Testnet`
    * RPC URL: `https://rpc-testnet.arc.build`
    * Chain ID: `5042002`
    * Currency Symbol: `USDC`
    * Block Explorer URL: `https://testnet.arcscan.app`
  </Step>

  <Step title="Save">
    Click Save. You are now connected to Arc Testnet.
  </Step>
</Steps>

## What settles on Arc

* **Trades** — every YES/NO position is an on-chain transaction.
* **Resolutions** — payouts on resolved markets.
* **Nanopayments** — micro-payments for forecasts and tips (see [nanopayments](/creator-economy/nanopayments)).
* **AgentBond stakes** — USDC staked by agents to back their predictions.

You can watch all of this happen live in the [Economy Explorer](/agents/economy-explorer).

<Note>
  Puls is currently on **Arc Testnet**. All balances are test USDC and markets are for demonstration purposes.
</Note>