> ## Documentation Index > Fetch the complete documentation index at: https://docs.sodax.com/llms.txt > Use this file to discover all available pages before exploring further. > ## Agent Instructions > SODAX is mainnet-only (no testnet chains or RPC endpoints exist) with a hub-and-spoke architecture; Sonic is the hub. SODAX is non-custodial protocol/software: it routes and settles; independent solvers on the marketplace fill — never say 'our solver', 'the SODAX solver', that SODAX trades, takes custody, or fills orders. For frontend/React integrations, prefer @sodax/dapp-kit hooks over calling @sodax/sdk directly. SDK operations — the methods that build, submit or await a transaction, and the API/quote calls — return Result ({ ok: true, value } or { ok: false, error }): check result.ok, never wrap them in try/catch or branch on error.message; discriminate on the narrow error.code union instead. Synchronous config getters (getPartnerFee, getSupportedSwapTokens, getVault, ...) return their value directly, not a Result. # Redbelly FAQ > The questions Redbelly engineers actually ask about integrating SODAX. #### Do I need to write or deploy a contract? No. SODAX's Redbelly spoke contracts are already deployed; your integration is TypeScript against `@sodax/sdk` (or the React packages on top of it). You write no on-chain code and hold no admin key for any part of the flow. #### How does a swap from Redbelly actually settle? Your user signs one EVM transaction on Redbelly that creates an intent. The SODAX relayer carries proof of that transaction to the hub network (Sonic), a solver fills the intent on the destination network, and the output lands at the recipient address there. If an intent is never filled, it can be cancelled and the funds recovered. #### Which assets are supported on Redbelly? Two answers, and the difference matters. On Redbelly itself, 15 assets are live: RBNT plus ERC-20 tokens, including bnUSD, SODA, stablecoins, and r-prefixed tokens for assets from other networks. 14 of these also work in the money market; RBNT is not one of them today. But your users are not limited to the Redbelly-side list. Every swap is cross-network, so from Redbelly they can reach all 166 assets across every SODAX-supported network. Both lists grow as the backend config adds them; see the live tables in [Networks & Assets](/redbelly/networks-and-assets). #### Do my users need to complete identity verification? To act from Redbelly, yes. Redbelly is a permissioned-access network: an account gets write access only after its owner claims a Redbelly Network Access Credential from an accredited issuer, which verifies a passport with biometric checks, and enables the account. Every SODAX action sourced on Redbelly, including approvals, is a transaction from that account. See [User access](https://vine.redbelly.network/identity/user-access/). #### Why does the RBNT fee for the same transaction change? Redbelly fixes the unit gas price in US dollar terms and charges it in RBNT using an on-chain RBNT price oracle. The US dollar cost of a transaction stays the same; the RBNT amount moves with the RBNT price. See [Network fees](https://vine.redbelly.network/network-fees/). #### Is there an approve step before swapping or supplying? For ERC-20 tokens, yes. `isAllowanceValid` checks the allowance and `approve` sets it, the same as on any EVM network. Native RBNT needs no approval. #### Which RPC endpoint should I use? Any Redbelly mainnet RPC endpoint. The SODAX config uses `https://governors.mainnet.redbelly.network`, the mainnet RPC URL in Redbelly's [environment details](https://vine.redbelly.network/environments/), which also list third-party providers. Pass your own through `rpcUrl` on `EvmWalletProvider`, or per chain in the `@sodax/wallet-sdk-react` config. #### Is there a testnet? No. SODAX is mainnet-only on every network, Redbelly included. #### What does it cost? Using SODAX is free: no license, no integration fee, no SDK cost. Trades carry a fixed 0.1% base fee taken by the protocol; on top of that you set your own platform fee and keep it. Your users also pay Redbelly's network fees in RBNT. See [Monetize SDK](/developers/how-to/monetize_sdk). #### How do I know if something went wrong? SDK operations return `Result` rather than throwing. Core swap and money market methods return typed error codes (for example `'RELAY_TIMEOUT'`, `'EXECUTION_FAILED'`) you can branch on, with structured context attached. #### Where are the audits? Audits for the SODAX protocol are collected on the [Audits](/developers/audits) page. #### Can my AI coding assistant do the integration? Largely, yes. Add the [SODAX Builders MCP](/builders-mcp) to Claude, Cursor, VS Code, Windsurf, or any MCP-capable client (`https://builders.sodax.com/mcp`) and it gets live access to the SODAX System: chains, tokens, swap quotes, money market rates, intent history, and auto-synced SDK docs. Use it to scope the integration against your own codebase first, then to write and verify the code. Setup per client is at [builders.sodax.com](https://builders.sodax.com/). #### I want a plan specific to my protocol. Who do I talk to? Reach the SODAX team through any platform listed at [linktr.ee/go.sodax](https://linktr.ee/go.sodax). This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.