Supported Chains

Sponge supports multiple blockchain networks across EVM and Solana ecosystems.

Chain Overview

Chain	ID	Type	Environment
Ethereum	`ethereum`	EVM	Mainnet
Base	`base`	EVM	Mainnet
Solana	`solana`	Solana	Mainnet
Sepolia	`sepolia`	EVM	Testnet
Base Sepolia	`base-sepolia`	EVM	Testnet
Solana Devnet	`solana-devnet`	Solana	Testnet
Tempo	`tempo`	EVM	Testnet

API Key Chain Access

Chain Restrictions

Your API key type determines which chains you can access. Test keys can only use testnets, and live keys can only use mainnets.

Test Keys (`sponge_test_*`)

Chain	Chain ID	Description
`sepolia`	11155111	Ethereum testnet, moderate block times
`base-sepolia`	84532	Base testnet, fast and cheap
`solana-devnet`	102	Solana development network
`tempo`	42431	Fast testnet with instant finality

Live Keys (`sponge_live_*`)

Chain	Chain ID	Description
`ethereum`	1	Ethereum mainnet
`base`	8453	Base L2, low fees
`solana`	101	Solana mainnet

EVM Chains

Ethereum

The original smart contract platform.

// Transfer ETH
await wallet.transfer({
  chain: "ethereum",
  to: "0x...",
  amount: "0.1",
  currency: "ETH"
});
 
// Transfer USDC
await wallet.transfer({
  chain: "ethereum",
  to: "0x...",
  amount: "100.0",
  currency: "USDC"
});

Supported Tokens:

ETH (native)
USDC (0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48)

Base

Coinbase's L2 with low fees and fast transactions.

await wallet.transfer({
  chain: "base",
  to: "0x...",
  amount: "50.0",
  currency: "USDC"
});

Supported Tokens:

ETH (native)
USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)

Sepolia (Testnet)

Ethereum's primary testnet.

// Get testnet ETH from faucet
await wallet.requestFaucet({ chain: "sepolia" });
 
await wallet.transfer({
  chain: "sepolia",
  to: "0x...",
  amount: "0.1",
  currency: "ETH"
});

Base Sepolia (Testnet)

Base's testnet environment.

await wallet.transfer({
  chain: "base-sepolia",
  to: "0x...",
  amount: "10.0",
  currency: "USDC"
});

Tempo (Testnet)

A specialized testnet with instant transaction finality. Ideal for development and testing.

// Get free pathUSD
await wallet.requestFaucet({ chain: "tempo" });
 
// Transfer pathUSD
await wallet.transfer({
  chain: "tempo",
  to: "0x...",
  amount: "100.0",
  currency: "pathUSD"
});

Features:

Instant finality
Free faucet tokens
Ideal for rapid iteration

Solana Chains

Solana Mainnet

High-performance blockchain with sub-second finality.

// Transfer SOL
await wallet.transfer({
  chain: "solana",
  to: "RecipientAddress",
  amount: "1.0",
  currency: "SOL"
});
 
// Transfer USDC
await wallet.transfer({
  chain: "solana",
  to: "RecipientAddress",
  amount: "50.0",
  currency: "USDC"
});
 
// Swap using Jupiter
await wallet.swap({
  chain: "solana",
  fromToken: "SOL",
  toToken: "USDC",
  amount: "1.0"
});

Features:

Sub-second finality
Low fees (~$0.00025 per tx)
Jupiter DEX integration for swaps

Solana Devnet (Testnet)

await wallet.transfer({
  chain: "solana-devnet",
  to: "RecipientAddress",
  amount: "1.0",
  currency: "SOL"
});

Getting Available Chains

// List all chains available for your API key
const chains = await wallet.getAvailableChains();
 
// [
//   { id: "ethereum", name: "Ethereum", type: "evm", chainId: 1 },
//   { id: "base", name: "Base", type: "evm", chainId: 8453 },
//   { id: "solana", name: "Solana", type: "solana", chainId: 101 }
// ]

Chain Configuration

Each chain has the following configuration:

interface ChainConfig {
  id: string;           // Chain identifier (e.g., "ethereum")
  name: string;         // Human-readable name
  chainId: number;      // Numeric chain ID
  type: "evm" | "solana";
  symbol: string;       // Native token symbol
  isTestnet: boolean;
  explorerUrl: string;  // Block explorer URL
}

Working with Chain IDs

// Get chain by ID
const config = await wallet.getChainConfig("base");
console.log(config.chainId); // 8453
 
// Check if chain is available
const isAvailable = await wallet.isChainAvailable("ethereum");

Cross-Chain Considerations

Address Compatibility

EVM addresses are compatible across all EVM chains. However, you cannot send from an EVM chain to a Solana address or vice versa.

Your EVM wallet address works on all EVM chains:

const addresses = await wallet.getAddresses();
// addresses.evm is the same for ethereum, base, sepolia, etc.

Chain-Specific Tokens

Token contracts differ across chains. USDC on Ethereum has a different contract address than USDC on Base:

Chain	USDC Contract
Ethereum	0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
Base	0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Solana	EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v

The SDK handles this automatically - just specify currency: "USDC" and the correct contract is used.

Gas and Fees

EVM Gas

Gas is automatically estimated for EVM transactions:

const tx = await wallet.transfer({
  chain: "base",
  to: "0x...",
  amount: "10.0",
  currency: "USDC"
});
 
// Gas is paid from your ETH balance on that chain

Solana Fees

Solana transactions have minimal fees (~0.000005 SOL per transaction).

Explorer URLs

Transaction results include explorer URLs:

const tx = await wallet.transfer({
  chain: "ethereum",
  to: "0x...",
  amount: "0.1",
  currency: "ETH"
});
 
console.log(tx.explorerUrl);
// https://etherscan.io/tx/0x...

Chain	Explorer
Ethereum	etherscan.io
Base	basescan.org
Solana	solscan.io
Sepolia	sepolia.etherscan.io
Base Sepolia	sepolia.basescan.org
Solana Devnet	solscan.io?cluster=devnet