buff.finance

What It Is

Buff is an on-chain “round-up spare change” automated investing protocol and TypeScript SDK for Solana, positioned somewhat like an on-chain version of Acorns. It is not a centralized exchange, nor is it a full wallet. Instead, it is a lightweight API client designed to be embedded into DApps, AI Agents, bots, or x402 payment flows: when a user makes a transaction, API payment, or other on-chain spend, Buff rounds the transaction amount up according to a selected plan, deposits the difference into the user’s Buff wallet, and swaps it into the target asset via Jupiter once a threshold is reached.

Core Features and Asset Support

The available text shows that Buff is currently “Available on Solana,” with more chains still planned. Example supported investment assets include BTC, ETH, SOL, and USDC, with support for either a single investInto asset or multi-asset allocations. Its core functions include getWrapInstructions, calculateRoundUp, buildSwap, executeSwap, getPortfolio, and deriveWallet. It works with Node.js, Deno, Serverless, React/Vue/Svelte, as well as AI Agent environments such as ElizaOS, OpenClaw, and Claude Code. Buff emphasizes non-custodial design: user or Agent wallets can be deterministically derived from signatures, with keys owned by the user and exportable.

Pricing and Fees

Buff’s business model is “free to integrate, paid per round-up.” There are four plans: Seed, Sprout, Tree, and Forest, which round up to $0.05, $0.10, $0.50, and $1.00 respectively. Buff fees are 1.00%, 0.75%, 0.50%, and 0.25% respectively. A single round-up is capped at $1, and no fee is charged when the transaction amount lands exactly on the round-up boundary. By default, an automatic swap is triggered once the accumulated amount reaches $5. The fee structure is transparent, but actual swaps may still involve on-chain fees and Jupiter routing/execution costs, which are not detailed in the text.

Pros and Cons

The main advantages are a clear developer experience, 5-line integration, API Key authentication, server-side calculation, and x402 payment compatibility, all of which make Buff well suited for automation and machine-payment scenarios. Platforms can also generate revenue through revenue sharing. The downsides are also clear: only Solana is currently disclosed, and there is no information on regulatory licenses, audits, insurance, cold storage, customer support, KYC, or fiat on/off-ramps. In addition, Buff depends on the Buff API and Jupiter, creating reliance on both its own server-side infrastructure and third-party routing.

Who It’s For and Access from China

Buff is better suited to Solana application developers, AI Agent builders, and on-chain payment platforms than to ordinary users who simply want to buy and trade crypto directly. The text does not disclose access conditions from China, so network availability, payment methods, and compliance restrictions are all unknown. If you need more mature trading, fiat deposits, or multi-chain DeFi, you may want to consider exchanges, wallet-native recurring investment features, or alternatives such as Jupiter, Raydium, and Uniswap.