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DeFiMath is a pure Solidity math primitives library for on-chain finance, positioned as the “math layer for on-chain finance.” It provides 40+ functions across six modules: basic math, options, binary options, futures, interest rates, and statistics. The materials highlight Black-Scholes option pricing at around 2,876 gas, a maximum absolute option-pricing error below 1e-12, and no runtime dependencies.
Functionally, DeFiMath is not a general-purpose developer toolkit; its focus is DeFi financial engineering. It covers Black-Scholes call/put pricing, Greeks, implied volatility solving, cash-or-nothing binary options, continuously compounded futures pricing, compound interest/present value/IRR/YTM, APR and APY conversion, and statistical metrics such as volatility, Sharpe ratio, maximum drawdown, VaR, and CVaR. It is distributed via the npm package defimath-lib and can be imported directly into Solidity contracts. The documentation specifies hard requirements of Solidity ^0.8.31 and evmVersion: "osaka", because it depends on the clz Yul builtin and the CLZ opcode introduced with Osaka.
The library is released under the MIT License, allowing commercial use, forks, and embedding in proprietary contracts, making it suitable for direct protocol integration. In terms of pricing, the library itself is open source and free. The website also offers custom Solidity development, optimization, testing audits, and Web3 integration services, but does not disclose pricing. Overall documentation quality is good, with installation instructions, compilation requirements, sample code, module explanations, and an FAQ. It also lists performance comparisons against PRBMath, ABDK, Solady, and Derivexyz. However, the materials do not provide audit reports, customer case studies, or a complete list of supported chains.
Its strengths are strong vertical specialization, clearly stated gas metrics, no dependencies, a permissive MIT license, and coverage of key on-chain options and risk-calculation needs. The drawbacks are a relatively high tooling barrier: it requires newer Solidity and EVM targets, and deployability depends on whether the specific L1/L2 already supports Osaka/CLZ. It is best suited for options DEXs, structured-product vaults, lending protocols, on-chain risk engines, and Solidity teams that need complex pricing logic. It is not a good fit for typical Web2 projects or non-EVM projects.
The crawled materials do not provide information about access from mainland China, mirrors, payment options, or local support, so the access status is unknown. Since the library is distributed through the npm and GitHub ecosystems, domestic teams should verify npm/GitHub availability in advance, confirm Osaka support on the target chain, and assess whether alternative libraries such as PRBMath, Solady, or ABDK are needed.
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