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

# Supported Networks

> EVM chains and Solana Devnet supported on the Ababil testnet.

<Note>
  All networks below are **testnet**. A merchant must have a wallet registered on a given chain for that chain to appear in `payment_requirements` when creating an intent.
</Note>

## Testnet Networks

| Network          | CAIP-2 ID         | Chain ID   | USDC Contract                                  | EIP-712 Domain |
| ---------------- | ----------------- | ---------- | ---------------------------------------------- | -------------- |
| Base Sepolia     | `eip155:84532`    | `84532`    | `0x036CbD53842c5426634e7929541eC2318f3dCF7e`   | `USDC`         |
| Ethereum Sepolia | `eip155:11155111` | `11155111` | `0x1c7D4B196Cb0C7B01d743Fbc6116a902379C7238`   | `USDC`         |
| Arc Testnet      | `eip155:5042002`  | `5042002`  | `0x3600000000000000000000000000000000000000`   | `USDC`         |
| Solana Devnet    | `solana:devnet`   | N/A        | `4zMMC9srt5Ri5X14GAgXhaHii3GnPAEERYPJgZJDncDU` | N/A (SPL)      |

## Key Notes

**Chain-agnostic intents** — payment intents automatically include all chains on which the merchant has a registered wallet. Buyers choose which supported chain to pay from at checkout.

**EIP-712 domain name** — all testnet chains use `"USDC"` as the domain name. Never hardcode `"USD Coin"`. Always read `usdcDomainName` directly from the `payment_requirements` array returned by the API.

**Solana** uses SPL token transfers rather than EIP-3009. The signing flow is different: a two-step process where an unsigned transaction is fetched first, then signed with a Solana wallet. See [Custom Integration — Solana](/api-reference/custom-integration#step-2b--sign-solana-spl-transfer) for full details.

**Arc Testnet** is an EVM-compatible chain (Chain ID `5042002`) and uses the standard EIP-3009 signing flow — the same as Base and Ethereum.

**USDC atomic units** — all amounts in the API are expressed in atomic USDC units (USDC × 1,000,000). \$29.99 = `"29990000"`. Never pass float values to `value` or `maxAmountRequired`.