# Topper > Buy and sell digital assets, your crypto, your way Topper is a fiat-to-crypto on-ramp and off-ramp payment widget for Web3 apps and wallets. It lets users buy and sell digital assets to and from self-custodial wallets using cards and other common payment methods. Topper is a fiat-to-crypto on-ramp and off-ramp, offered as a payment widget and developer toolkit for Web3 applications, games, and platforms. It lets individuals buy and sell a range of digital assets directly to and from self-custodial wallet addresses, and provides crypto projects with an embeddable payment tool to process customer purchases. The service targets both individual users seeking a simple way to acquire crypto and businesses that want to add a payment on-ramp to their product. The widget accepts payment methods such as debit and credit cards, Apple Pay, Google Pay, PayPal, and other local options. It integrates into third-party wallets, games, and Web3 experiences through developer SDKs and an API, allowing partners to embed buying and selling functionality without building their own payment infrastructure. Topper also supports recurring purchases, letting individuals schedule regular crypto buys funded by card payments. Topper operates as a brand of Uphold, a digital money platform that offers trading and payment services across fiat currencies, cryptocurrencies, and commodities. Through this relationship, Topper draws on Uphold's payments infrastructure and regulatory standing, and it is licensed and regulated in the markets where it operates. It is used by individual crypto buyers as well as Web3 projects, wallets, and games that integrate the widget to offer purchasing options to their own users. - Type: Project - Sector: Payments - Status: Active - Founded: 2023-04-26 - Profile: https://thegrid.id/profiles/topper ## Products - [Topper](https://thegrid.id/profiles/topper): Topper is a fiat-to-crypto on-ramp and crypto-to-fiat off-ramp delivered through an embeddable widget and developer APIs for business partners and wallets. Consumers buy crypto directly to a self-custodial wallet using cards, digital wallets, or bank transfers, and sell crypto to receive fiat on a linked debit card. The product supports recurring purchases and integrates via a web SDK, mobile SDK, REST API, webhooks, and single sign-on for partner applications. (On/Off Ramp, Live, Main Product) ## Links - [Main](https://www.topperpay.com) - [Documentation](https://docs.topperpay.com) - [Blog](https://www.topperpay.com/blog) - [Terms of Service](https://www.topperpay.com/legal/terms-of-use) - [Privacy policy](https://www.topperpay.com/legal/privacy-data-policy) - [Twitter / X](https://x.com/topperbyuphold) - [GitHub](https://github.com/uphold/topper-docs) - [LinkedIn](https://www.linkedin.com/company/upholdinc) ## Relationships - [Uphold](https://thegrid.id/profiles/uphold): Parent organization ## Legal This data is provided under two licensing models. Model 1 - open data. The open data core is licensed under the Open Database License (ODbL) — a copyleft/share-alike license allowing free use, modification, and sharing for any purpose. Attribution is required: include "Powered by The Grid" linking to https://thegrid.id wherever the data is used. Derivative databases must be shared under ODbL terms. 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