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

# Chains & Protocols

> Blockchain networks and DeFi protocols supported by Cred Protocol

## Chains Supported

Cred Protocol aggregates on-chain data across multiple blockchain networks to build comprehensive credit profiles. All chains are queried for transaction history, token balances, NFT holdings, and DeFi activity.

| Chain     | Chain ID | Data Coverage                            |
| --------- | -------- | ---------------------------------------- |
| Ethereum  | 1        | Full (lending, balances, NFTs, identity) |
| Base      | 8453     | Full (lending, balances, NFTs, identity) |
| Polygon   | 137      | Balances, NFTs, transactions, identity   |
| Arbitrum  | 42161    | Balances, NFTs, transactions             |
| Optimism  | 10       | Balances, NFTs, transactions             |
| Avalanche | 43114    | Balances, NFTs, transactions             |
| BNB Chain | 56       | Balances, NFTs, transactions             |
| Celo      | 42220    | Balances, transactions                   |
| Scroll    | 534352   | Balances, transactions                   |
| Linea     | 59144    | Balances, transactions                   |

<Info>
  Ethereum and Base have the deepest lending protocol coverage. All chains contribute to transaction history, balance data, and overall activity metrics.
</Info>

***

## Lending Protocol Coverage

Cred Protocol tracks borrowing and lending activity across major DeFi protocols. This data directly contributes to the **Borrowing History**, **Wallet Health**, and **New Credit** scoring factors.

### Aave

| Protocol | Version | Chain    | Coverage                                       |
| -------- | ------- | -------- | ---------------------------------------------- |
| Aave     | V3      | Ethereum | Collateral deposits, variable debt positions   |
| Aave     | V3      | Base     | Collateral deposits (USDC, USDbC, WETH, cbETH) |
| Aave     | V2      | Ethereum | Collateral deposits                            |

<Accordion title="Supported Aave V3 Ethereum Assets">
  **Collateral tokens tracked:**
  WETH, wstETH, WBTC, USDC, DAI, LINK, AAVE, cbETH, USDT, rETH, LUSD, CRV, MKR, SNX, BAL, UNI, LDO, ENS, 1INCH, FRAX, GHO, RPL, sDAI, STG, KNC, FXS, crvUSD, PYUSD, weETH, osETH, USDe, ETHx, sUSDe, tBTC, cbBTC, USDS, rsETH

  **Debt tokens tracked:**
  All corresponding variable debt tokens for the above assets
</Accordion>

<Accordion title="Supported Aave V2 Ethereum Assets">
  **Collateral tokens tracked:**
  USDT, WBTC, WETH, YFI, ZRX, UNI, AAVE, BAT, BUSD, DAI, ENJ, KNC, LINK, MANA, MKR, REN, SNX, SUSD, TUSD, USDC, CRV, GUSD, BAL, XSUSHI, RENFIL, RAI, AMPL, PAX, DPI, FRAX, FEI, stETH, ENS, UST, CVX, 1INCH, LUSD
</Accordion>

### Compound

| Protocol | Version | Chain    | Coverage            |
| -------- | ------- | -------- | ------------------- |
| Compound | V2      | Ethereum | Collateral deposits |

<Accordion title="Supported Compound V2 Assets">
  **Collateral tokens tracked:**
  cETH, cUSDC, cDAI, cBAT, cUNI, cZRX, cUSDT, cCOMP, cWBTC
</Accordion>

***

## Additional Data Sources

Beyond lending protocols, Cred Protocol analyzes additional on-chain data that contributes to the **Trust**, **Wallet Composition**, and **Interactions** scoring factors.

### Identity & Reputation

These attestations contribute to the **Trust** factor:

| Source           | Description                                         | Networks                |
| ---------------- | --------------------------------------------------- | ----------------------- |
| ENS              | Ethereum Name Service domain ownership              | Ethereum                |
| Basename         | Base network name service (e.g., username.base.eth) | Base                    |
| Gitcoin Passport | Humanity verification (score ≥ 20 required)         | Cross-chain             |
| POAPs            | Proof of Attendance Protocol event tokens           | Ethereum, Base, Polygon |
| Goldfinch UID    | Goldfinch Unique Identity verification              | Ethereum                |
| Anima Reputation | Synaps identity verification badges                 | BNB Chain, Polygon      |

### Asset & Activity Data

These metrics contribute to the **Wallet Composition**, **Wallet Health**, and **Interactions** factors:

| Data Type           | Description                                | Networks                |
| ------------------- | ------------------------------------------ | ----------------------- |
| Token Balances      | ERC-20 token holdings and values           | All supported chains    |
| Stablecoin Holdings | USDT, USDC, DAI, and 15+ other stablecoins | All supported chains    |
| NFT Holdings        | Non-fungible token ownership               | Ethereum, Base, Polygon |
| Transaction History | Total transactions, first/last activity    | All supported chains    |
| Transfer Activity   | Token transfer frequency and patterns      | All supported chains    |

<Accordion title="Supported Stablecoins">
  Cred Protocol tracks holdings in the following stablecoins:

  USDT (Tether), USDC (USD Coin), DAI, FDUSD (First Digital USD), USDD, PYUSD (PayPal USD), TUSD (True USD), USDe (Ethena), FRAX, USDY (Ondo), USDB, USDJ, EURS (STASIS EURO), USTC (TerraClassicUSD), USDP (Pax Dollar), EURC, LUSD (Liquity USD), GUSD (Gemini Dollar), cUSD (Celo Dollar), sUSD, GHO
</Accordion>

***

## Payment Networks (x402)

Cred Protocol supports [x402 payment authentication](/guides/authentication#x402-payment-authentication), allowing instant API access by paying per request with USDC — no account required. The following networks are supported for x402 payments:

| Network       | Chain ID   | Type    | Token                       | Facilitator                 |
| ------------- | ---------- | ------- | --------------------------- | --------------------------- |
| Base          | 8453       | Mainnet | USDC                        | Coinbase Developer Platform |
| Base Sepolia  | 84532      | Testnet | USDC                        | Coinbase Developer Platform |
| SKALE         | 1187947933 | Mainnet | Bridged USDC (SKALE Bridge) | dirtroad.dev                |
| SKALE Testnet | 324705682  | Testnet | Bridged USDC (SKALE Bridge) | dirtroad.dev                |

<Info>
  SKALE offers zero-gas transactions with sub-second finality, making it ideal for high-frequency micropayments. See the [authentication guide](/guides/authentication#x402-payment-authentication) for integration details.
</Info>

***

## Coming Soon

We're continuously expanding coverage. Planned additions include:

<CardGroup cols={2}>
  <Card title="More Lending Protocols" icon="building-columns">
    Morpho, Spark, Euler, and other major lending markets
  </Card>

  <Card title="Additional Chains" icon="link">
    zkSync, Mantle, and emerging L2s
  </Card>

  <Card title="Coinbase Developer Platform Protocols" icon="vault">
    MakerDAO, Liquity, and collateralized debt positions
  </Card>

  <Card title="Perp & Options" icon="chart-line">
    Perpetual and options protocol activity
  </Card>
</CardGroup>

<Info>
  Have a protocol or chain you'd like us to support? [Contact us](mailto:support@credprotocol.com) to request coverage.
</Info>