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Modulo is not a cryptocurrency exchange or a conventional software wallet. It is a category of physical private-key products designed for long-term Bitcoin self-custody. Its pitch is “Your key. In steel. Permanent. Offline.” In practice, it stores key information in a stainless-steel physical structure and uses physical random assembly to generate entropy, aiming to avoid private-key exposure risks from software, networks, and manufacturing processes.
The product comes in two versions: the 256-bit Key and the 128-bit MINI Key. The 256-bit version is the full system, with a 133mm stainless-steel key body and a 141mm protective case featuring 4mm steel walls. The 128-bit MINI is lighter and positioned as a secondary key or minimal setup. Materials include SUS304/316 stainless steel, with the product page emphasizing corrosion resistance, high-temperature resistance, and preservation across generations.
From a security perspective, Modulo’s biggest distinction is that it has no electronic components, no operating system, and no network connection, which naturally removes attack surfaces such as hackers, malware, and electronic failures. However, this also means users must correctly understand private-key generation, storage, and recovery. The site’s main content does not disclose any third-party audit, insurance coverage, or additional recovery mechanism.
The 128-bit MINI Key is priced at $80.10, while the 256-bit Key is priced at $260.10. Paying with Bitcoin saves 10% compared with fiat payment. Lightning payments via BTCPay Server are shown as having zero processing fees, and on-chain Bitcoin is also supported. Card payments are processed by Square, and fiat payments carry a 10% surcharge.
Products usually ship within 5 business days. The return policy allows returns within 30 days of receipt. Refunds are processed within 5–7 business days after the returned item is received, but customers are responsible for return shipping costs, and original shipping fees are non-refundable.
The main advantages are that it is offline, durable, fire-resistant, and corrosion-resistant. It is suitable for users who hold BTC long term, value self-custody, and want to reduce supply-chain risk. It may also be used for networks such as Nostr that require keys and entropy.
The downsides are that it does not provide platform features such as coin swaps, trading pairs, KYC accounts, fiat deposits or withdrawals, derivatives, or leverage. It is also not beginner-friendly: if the private key is lost, exposed, or mishandled, the responsibility largely falls on the user.
The site does not state whether access, shipping, or payment is available in mainland China, so its China availability can only be rated as unknown. Given that it supports Bitcoin payments and card purchases, actual usability will depend on network access, cross-border logistics, and payment channels.
Users looking for a more common wallet setup may want to compare hardware wallets or metal seed-phrase backup products. Those who need trading functionality should choose a compliant exchange or wallet app rather than a physical key product like Modulo.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on modulo.network official site.
modulo.network is an Unknown Crypto provider. TG4G tracks its product information, with monthly pricing from $80.10, an overall rating of 7.0/10, and a China-accessibility score of Workable. Click "Visit Official Site" to reach modulo.network directly.