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

# Supported Chains and Currencies

> Complete list of supported blockchain networks and currencies for Request Network

## Overview

Request Network supports payments across **10 EVM-compatible blockchain networks** with **553+ currencies** including major cryptocurrencies, stablecoins, and fiat currencies. This comprehensive coverage ensures global accessibility and flexibility for all payment scenarios.

## Supported Blockchain Networks

<CardGroup cols={2}>
  <Card title="Ethereum" icon="ethereum">
    **Mainnet & Sepolia Testnet**

    **Native Token:** ETH
    **Popular Tokens:** USDC, USDT, DAI, LINK, UNI
    **Network ID:** 1 (mainnet), 11155111 (sepolia)

    **Best For:** High-value transactions, DeFi integration
  </Card>

  <Card title="Polygon" icon="polygon">
    **Mainnet & Mumbai Testnet**

    **Native Token:** MATIC
    **Popular Tokens:** USDC, USDT, DAI, WETH
    **Network ID:** 137 (mainnet), 80001 (mumbai)

    **Best For:** Low-cost transactions, high throughput
  </Card>
</CardGroup>

<CardGroup cols={2}>
  <Card title="Arbitrum" icon="arbitrum">
    **One & Sepolia Testnet**

    **Native Token:** ETH
    **Popular Tokens:** USDC, USDT, ARB, GMX
    **Network ID:** 42161 (one), 421614 (sepolia)

    **Best For:** Lower fees with Ethereum security
  </Card>

  <Card title="Optimism" icon="optimism">
    **Mainnet & Sepolia Testnet**

    **Native Token:** ETH
    **Popular Tokens:** USDC, USDT, OP, SNX
    **Network ID:** 10 (mainnet), 11155420 (sepolia)

    **Best For:** Fast transactions, Ethereum compatibility
  </Card>
</CardGroup>

<CardGroup cols={2}>
  <Card title="Base" icon="base">
    **Mainnet & Sepolia Testnet**

    **Native Token:** ETH
    **Popular Tokens:** USDC, cbETH, DAI
    **Network ID:** 8453 (mainnet), 84532 (sepolia)

    **Best For:** Coinbase ecosystem integration
  </Card>

  <Card title="Additional Networks" icon="network">
    **More Networks Available:**

    * BSC (Binance Smart Chain)
    * Avalanche C-Chain
    * Fantom Opera
    * Gnosis Chain
    * Celo
  </Card>
</CardGroup>

## Currency Categories

### Major Cryptocurrencies

<Tabs>
  <Tab title="Native Tokens">
    **Blockchain Native Currencies:**

    | Currency     | Symbol | Chains Available                   |
    | ------------ | ------ | ---------------------------------- |
    | Ethereum     | ETH    | Ethereum, Arbitrum, Optimism, Base |
    | Polygon      | MATIC  | Polygon                            |
    | Binance Coin | BNB    | BSC                                |
    | Avalanche    | AVAX   | Avalanche                          |
    | Fantom       | FTM    | Fantom                             |
  </Tab>

  <Tab title="Stablecoins">
    **USD-Pegged Stablecoins:**

    | Currency | Symbol | Chains Available                      |
    | -------- | ------ | ------------------------------------- |
    | USD Coin | USDC   | All supported chains                  |
    | Tether   | USDT   | Ethereum, Polygon, BSC, Avalanche     |
    | DAI      | DAI    | Ethereum, Polygon, Arbitrum, Optimism |
    | BUSD     | BUSD   | BSC, Ethereum                         |
    | FRAX     | FRAX   | Ethereum, Polygon, Arbitrum           |

    **Other Stablecoins:**

    * USDC.e (bridged USDC on various chains)
    * sUSD (Synthetix USD)
    * LUSD (Liquity USD)
    * And many more...
  </Tab>

  <Tab title="Popular Tokens">
    **DeFi & Ecosystem Tokens:**

    | Currency  | Symbol | Primary Chains              |
    | --------- | ------ | --------------------------- |
    | Chainlink | LINK   | Ethereum, Polygon, Arbitrum |
    | Uniswap   | UNI    | Ethereum, Polygon, Arbitrum |
    | Aave      | AAVE   | Ethereum, Polygon           |
    | Compound  | COMP   | Ethereum                    |
    | Curve DAO | CRV    | Ethereum, Polygon           |
    | 1inch     | 1INCH  | Ethereum, BSC               |
  </Tab>
</Tabs>

### Fiat Currencies

<AccordionGroup>
  <Accordion title="Major Fiat Currencies">
    **G7 & Major Global Currencies:**

    | Currency          | Code | Region         |
    | ----------------- | ---- | -------------- |
    | US Dollar         | USD  | United States  |
    | Euro              | EUR  | European Union |
    | British Pound     | GBP  | United Kingdom |
    | Japanese Yen      | JPY  | Japan          |
    | Canadian Dollar   | CAD  | Canada         |
    | Australian Dollar | AUD  | Australia      |
    | Swiss Franc       | CHF  | Switzerland    |
    | Chinese Yuan      | CNY  | China          |

    **Note:** Fiat currencies are used for pricing and conversion. Actual payments settle in cryptocurrency.
  </Accordion>

  <Accordion title="Emerging Market Currencies">
    **Regional Currencies:**

    | Currency           | Code | Region       |
    | ------------------ | ---- | ------------ |
    | Brazilian Real     | BRL  | Brazil       |
    | Indian Rupee       | INR  | India        |
    | Mexican Peso       | MXN  | Mexico       |
    | South African Rand | ZAR  | South Africa |
    | Turkish Lira       | TRY  | Turkey       |
    | Russian Ruble      | RUB  | Russia       |
    | Korean Won         | KRW  | South Korea  |
    | Thai Baht          | THB  | Thailand     |

    **Total Coverage:** 150+ international fiat currencies
  </Accordion>
</AccordionGroup>

## Currency Selection Guide

### For Different Use Cases

<CardGroup cols={2}>
  <Card title="📄 Invoicing" icon="receipt">
    **Recommended Currencies:**

    * **Pricing:** USD, EUR, GBP (familiar fiat terms)
    * **Settlement:** USDC, USDT, DAI (stable value)
    * **Networks:** Polygon, Arbitrum (lower fees)

    [Learn More →](/use-cases/invoicing)
  </Card>

  <Card title="💰 Payouts" icon="send">
    **Recommended Currencies:**

    * **High Volume:** USDC on Polygon (lowest fees)
    * **Cross-border:** USDC, USDT (global acceptance)
    * **Flexibility:** Native tokens for local markets

    [Learn More →](/use-cases/payouts)
  </Card>
</CardGroup>

<CardGroup cols={2}>
  <Card title="🛒 Checkout" icon="shopping-cart">
    **Recommended Currencies:**

    * **Customer Choice:** Multiple payment options
    * **Conversion:** USD pricing, crypto settlement
    * **Popular:** ETH, USDC, MATIC, BNB

    [Learn More →](/use-cases/checkout)
  </Card>

  <Card title="🔄 Subscriptions" icon="repeat">
    **Recommended Currencies:**

    * **Stability:** USDC, DAI (predictable values)
    * **Low Fees:** Polygon, Arbitrum networks
    * **Reliability:** Established stablecoins

    [Learn More →](/use-cases/subscriptions)
  </Card>
</CardGroup>

## Network Selection Criteria

### Cost Optimization

<Tabs>
  <Tab title="Transaction Fees">
    **Average Transaction Costs (2025):**

    | Network  | Native Transfer | ERC-20 Transfer | Typical Use                         |
    | -------- | --------------- | --------------- | ----------------------------------- |
    | Polygon  | \$0.001-0.01    | \$0.01-0.03     | High volume, frequent transactions  |
    | Arbitrum | \$0.10-0.50     | \$0.20-1.00     | Ethereum ecosystem, medium volume   |
    | Optimism | \$0.10-0.50     | \$0.20-1.00     | Ethereum ecosystem, medium volume   |
    | Base     | \$0.05-0.25     | \$0.10-0.50     | Coinbase integration                |
    | Ethereum | \$2-20          | \$5-50          | High value, infrequent transactions |

    <Info>
      **Fee Optimization Tips**

      * Use Polygon for high-frequency, low-value transactions
      * Use Ethereum for high-value, security-critical transactions
      * Consider L2 solutions (Arbitrum, Optimism) for balanced cost/security
    </Info>
  </Tab>

  <Tab title="Speed & Finality">
    **Transaction Confirmation Times:**

    | Network  | Block Time | Practical Finality | Best For                |
    | -------- | ---------- | ------------------ | ----------------------- |
    | Polygon  | 2 seconds  | 30-60 seconds      | Real-time applications  |
    | Base     | 2 seconds  | 30-60 seconds      | Fast user experiences   |
    | Arbitrum | 1 second   | 5-15 minutes       | Balanced speed/security |
    | Optimism | 2 seconds  | 5-15 minutes       | Balanced speed/security |
    | Ethereum | 12 seconds | 5-15 minutes       | Maximum security        |
  </Tab>

  <Tab title="Liquidity & Adoption">
    **Network Ecosystem Maturity:**

    | Network  | TVL     | DEX Liquidity | Ecosystem      | Adoption  |
    | -------- | ------- | ------------- | -------------- | --------- |
    | Ethereum | Highest | Highest       | Most mature    | Universal |
    | Polygon  | High    | High          | Very mature    | High      |
    | Arbitrum | High    | High          | Mature         | High      |
    | Optimism | Medium  | Medium        | Growing        | Medium    |
    | Base     | Growing | Growing       | New but strong | Growing   |
  </Tab>
</Tabs>

## Currency Codes and Formats

### Standard Format

Request Network uses standardized currency codes:

<CodeGroup>
  ```javascript Native Tokens theme={null}
  // Format: {SYMBOL}-{NETWORK}
  "ETH-mainnet"        // Ethereum on Ethereum mainnet
  "MATIC-matic"        // MATIC on Polygon mainnet
  "ETH-arbitrum-one"   // ETH on Arbitrum One
  "ETH-optimism"       // ETH on Optimism
  "BNB-bsc"           // BNB on BSC
  ```

  ```javascript ERC-20 Tokens theme={null}
  // Format: {SYMBOL}-{NETWORK}-{OPTIONAL_SUFFIX}
  "USDC-mainnet"       // USDC on Ethereum
  "USDC-matic"         // USDC on Polygon
  "USDC-arbitrum-one"  // USDC on Arbitrum
  "USDC-optimism"      // USDC on Optimism
  "USDT-mainnet"       // USDT on Ethereum
  "DAI-mainnet"        // DAI on Ethereum
  ```

  ```javascript Fiat Currencies theme={null}
  // Format: {ISO_CODE}
  "USD"                // US Dollar
  "EUR"                // Euro
  "GBP"                // British Pound
  "JPY"                // Japanese Yen
  "CAD"                // Canadian Dollar
  ```
</CodeGroup>

### Currency Validation

<CodeGroup>
  ```javascript Validate Currency theme={null}
  import { validateCurrency } from '@requestnetwork/request-client.js';

  // Check if currency is supported
  const isValid = validateCurrency('USDC-matic');
  console.log(isValid); // true

  // Get currency details
  const currencyInfo = getCurrencyInfo('USDC-matic');
  console.log(currencyInfo);
  // {
  //   symbol: 'USDC',
  //   network: 'matic',
  //   type: 'ERC20',
  //   decimals: 6,
  //   address: '0x2791Bca1f2de4661ED88A30C99A7a9449Aa84174'
  // }
  ```

  ```javascript API Currency Check theme={null}
  // Check supported currencies via API
  const response = await fetch('https://api.request.network/v2/currencies', {
    headers: {
      'Authorization': `Bearer ${apiKey}`
    }
  });

  const currencies = await response.json();
  console.log(currencies.supported);
  ```
</CodeGroup>

## Real-Time Price Data

Request Network uses multiple price feed sources for accurate conversions:

<AccordionGroup>
  <Accordion title="Price Oracle Sources">
    **Primary Data Sources:**

    * Chainlink Price Feeds (on-chain)
    * CoinGecko API (market aggregation)
    * CoinMarketCap API (market data)
    * DEX aggregators (real-time trading data)

    **Update Frequency:** Sub-minute updates for major pairs
  </Accordion>

  <Accordion title="Supported Conversion Pairs">
    **Fiat to Crypto:**

    * Any fiat currency → Any supported cryptocurrency
    * Real-time exchange rate calculation
    * Slippage protection for large amounts

    **Crypto to Crypto:**

    * Crosschain token conversions
    * Optimal routing through DEX aggregators
    * Minimal slippage and MEV protection
  </Accordion>
</AccordionGroup>

## What's Next?

<CardGroup cols={3}>
  <Card title="� Token List" href="/resources/token-list" icon="list">
    Complete token list with contract addresses and chain details
  </Card>

  <Card title="⚙️ Payment Types" href="/api-features/payment-types-overview" icon="credit-card">
    Learn about different payment types and currency options
  </Card>

  <Card title="🛠️ Integration" href="/api-setup/getting-started" icon="rocket">
    Start building with your preferred currencies and networks
  </Card>

  <Card title="🌐 NEAR Blockchain" href="/resources/near-blockchain" icon="globe">
    Learn about NEAR blockchain support and unique features
  </Card>
</CardGroup>