Quickstart on Redbelly

This page takes you from zero to a cross-network swap sourced from Redbelly. No new contracts, no approval for native RBNT, one signed transaction for your user.

Building with an AI assistant? Add the SODAX Builders MCP (https://builders.sodax.com/mcp) to Claude, Cursor, or any MCP-capable tool and it can pull live token lists, real quotes, and these docs while it writes your integration.

1. Install

npm install @sodax/sdk @sodax/wallet-sdk-core
# or: pnpm add / yarn add

2. Create a Redbelly wallet provider

Redbelly uses the same EvmWalletProvider as every other EVM network, keyed by ChainKeys.REDBELLY_MAINNET. The account behind it must have Redbelly network access: without it, the account cannot send the transaction that creates the intent. See User access.

import { EvmWalletProvider } from '@sodax/wallet-sdk-core';
import { ChainKeys } from '@sodax/sdk';

const walletProvider = new EvmWalletProvider({
  privateKey: '0x…', // private key of an account with Redbelly network access
  chainId: ChainKeys.REDBELLY_MAINNET,
  rpcUrl: 'https://governors.mainnet.redbelly.network',
});

import { EvmWalletProvider } from '@sodax/wallet-sdk-core';

// walletClient and publicClient are viem clients for Redbelly mainnet,
// usually supplied by wagmi from the user's connected EVM wallet
const walletProvider = new EvmWalletProvider({
  walletClient,
  publicClient,
});

Building in React? @sodax/wallet-sdk-react connects EVM wallets for you and hands back a ready-made provider via useWalletProvider. See Wallets.

3. Look up supported tokens

Token addresses and decimals come from the SDK config, so you never hard-code them.

import { Sodax, ChainKeys, type XToken } from '@sodax/sdk';

const sodax = new Sodax();

// find() returns XToken | undefined, so narrow before using the address
const bySymbol = (tokens: readonly XToken[], symbol: string) => {
  const token = tokens.find(t => t.symbol === symbol);
  if (!token) throw new Error(`${symbol} is not a supported swap token`);
  return token;
};

const rbnt = bySymbol(sodax.swaps.getSupportedSwapTokensByChainId(ChainKeys.REDBELLY_MAINNET), 'RBNT');
const usdcBase = bySymbol(sodax.swaps.getSupportedSwapTokensByChainId(ChainKeys.BASE_MAINNET), 'USDC');

4. Quote and swap

swap() runs the full lifecycle: it creates the intent on Redbelly, verifies the transaction landed, relays it to the hub, and notifies the solver to fill on the destination network.

import type { SolverIntentQuoteRequest } from '@sodax/sdk';

// 100 RBNT, built from the token's own decimals
const inputAmount = 100n * 10n ** BigInt(rbnt.decimals);

// Quote: 100 RBNT -> USDC on Base
const quoteResult = await sodax.swaps.getQuote({
  token_src: rbnt.address,
  token_dst: usdcBase.address,
  token_src_blockchain_id: ChainKeys.REDBELLY_MAINNET,
  token_dst_blockchain_id: ChainKeys.BASE_MAINNET,
  amount: inputAmount,
  quote_type: 'exact_input',
} satisfies SolverIntentQuoteRequest);

if (!quoteResult.ok) throw new Error('Quote failed');
const { quoted_amount } = quoteResult.value;

// `deadline` is an absolute Unix timestamp; getSwapDeadline turns an offset into one
const deadlineResult = await sodax.swaps.getSwapDeadline(300n); // 5 minutes from now
if (!deadlineResult.ok) throw new Error('Deadline lookup failed');

// Execute
const swapResult = await sodax.swaps.swap({
  params: {
    inputToken: rbnt.address,
    outputToken: usdcBase.address,
    inputAmount,
    minOutputAmount: (quoted_amount * 99n) / 100n, // your slippage policy
    deadline: deadlineResult.value,
    allowPartialFill: false,
    srcChainKey: ChainKeys.REDBELLY_MAINNET,
    dstChainKey: ChainKeys.BASE_MAINNET,
    srcAddress: await walletProvider.getWalletAddress(),
    dstAddress: '0x...', // recipient on Base
    solver: '0x0000000000000000000000000000000000000000',
    data: '0x',
  },
  walletProvider,
  timeout: 120_000,
});

if (swapResult.ok) {
  console.log('Submitted. Hub tx:', swapResult.value.intentDeliveryInfo.dstTxHash);
} else {
  console.error('Swap failed:', swapResult.error);
}

ok means the intent was created, relayed to the hub, and the solver notified, not that it was filled. Poll sodax.swaps.getStatus({ intent_tx_hash: intentDeliveryInfo.dstTxHash }) until the status is SolverIntentStatusCode.SOLVED, which is the only success signal. The main quickstart has the full polling loop, including why NOT_FOUND is not terminal. A few things to know on Redbelly:

RBNT needs no approval. It is the native token. Swapping an ERC-20 token on Redbelly needs an allowance first; see Approvals.
Amounts follow token.decimals. RBNT has 18 decimals, but USDC and USDT on Redbelly have 6. Always build amounts from the token’s own decimals.
No network access, no intent. If the account has not been enabled on Redbelly, the intent transaction cannot be sent. Have users complete Redbelly’s access flow before their first SODAX action.

Next steps

Swaps on Redbelly: approvals, fees, manual orchestration.
Money Market on Redbelly: supply and borrow with cross-network collateral.
Full API reference: Swaps in the SDK docs.

​1. Install

​2. Create a Redbelly wallet provider

​3. Look up supported tokens

​4. Quote and swap

​Next steps

1. Install

2. Create a Redbelly wallet provider

3. Look up supported tokens

4. Quote and swap

Next steps