Buy Quantstamp (QSP) with USD, EUR and Other Fiat Currencies
Quantstamp (QSP) is an Ethereum-based crypto asset connected to blockchain security, smart contract audits, automated verification, and Web3 infrastructure protection.
For users who want to buy QSP with USD, EUR, GBP, CAD, AUD, INR, KZT, JPY or other fiat currencies, the process usually starts with a crypto wallet, fiat on-ramp, centralized exchange, bank card, Apple Pay, Google Pay, or a swap through Ethereum-compatible liquidity.
This article was prepared by ilink, a FinTech and Web3 software developer with 14 years of experience and completed projects worldwide.
What is Quantstamp (QSP)?
Quantstamp is a blockchain security company known for smart contract audits, Web3 security reviews, infrastructure audits, and risk analysis for crypto projects. The company was founded in 2017, during a period when Ethereum, ICOs, decentralized applications, and smart contracts were growing quickly.
At that time, one of the biggest problems in crypto was smart contract risk. A smart contract is code that can hold, transfer, lock, or manage digital assets. If this code has a bug, attackers may be able to steal funds, freeze assets, manipulate protocol logic, or exploit project rules.
This is why smart contract audits became one of the most important services in Web3. Quantstamp entered the market to help projects find vulnerabilities before launch and reduce the risk of costly security failures.
Over time, Quantstamp’s work has covered many areas of the crypto market, including:
- Smart contracts;
- Decentralized applications;
- Layer-1 infrastructure;
- DeFi protocols;
- Bridges;
- NFT platforms;
- Gaming products;
- Staking systems;
- Web3 infrastructure.
Quantstamp’s official website describes the company as a global leader in blockchain security. It states that since 2017, Quantstamp has secured billions in digital assets and worked with recognized Web3 projects. The same official source lists more than 60 ecosystems, more than 1,300 audits, more than 250 clients, and more than $500 billion in digital assets secured.
These figures make Quantstamp one of the better-known names in the smart contract audit sector. However, users researching the QSP token should understand that Quantstamp as a company and QSP as a crypto asset are not exactly the same thing.
The QSP token is the crypto asset connected to Quantstamp’s original security auditing network. Coinbase describes QSP as an Ethereum token that powers Quantstamp, a security auditing network for crypto protocols. According to Coinbase, QSP can be used to pay for smart contract audits, earned by running verification nodes, and used for proposing and voting on network upgrades.
This means QSP was designed around the idea of decentralized security verification. Instead of relying only on traditional manual audits, the original vision included an automated smart contract security auditing platform where users could request scans and validators could help provide verification.
QSP is an ERC-20 token on Ethereum. The Ethereum contract address listed by major market-data sources is:
0x99ea4dB9EE77ACD40B119BD1dC4E33e1C070b80d
This contract address is important because several crypto assets may have similar names or tickers. Before buying, sending, or swapping QSP, users should always confirm that they are using the correct Ethereum contract.
Quantstamp’s history also includes a regulatory event that users should understand. In 2023, the U.S. Securities and Exchange Commission announced charges against Quantstamp related to its 2017 QSP token sale. The SEC stated that Quantstamp raised more than $28 million by selling QSP tokens to around 5,000 investors.
Quantstamp settled the matter without admitting or denying the findings. The SEC order also stated that Quantstamp completed its automated smart contract security auditing platform in June 2019 and no longer operates or lends substantial support to that platform.
This does not erase Quantstamp’s current work as a Web3 security company, but it matters for users researching QSP as a token. Users should separate two things:
- Quantstamp as a blockchain security company;
- QSP as an older Ethereum token connected to the original Quantstamp security protocol.
Current public supply data commonly lists QSP with a total supply of about 976 million tokens and circulating supply figures around the hundreds of millions. Because supply figures, token availability, and market data can change across platforms, users should always verify the latest data before buying.
The main topics connected to QSP include:
- Smart contract security;
- Automated contract verification;
- Blockchain audits;
- Web3 risk reduction;
- Security nodes;
- Protocol governance;
- Ethereum-based token infrastructure;
- Crypto audit payments.
Overall, QSP’s value depends on whether the token can maintain market interest, practical utility, and liquidity within the broader blockchain security sector.
Several factors may influence QSP’s long-term relevance:
- Token liquidity;
- Exchange support;
- Wallet compatibility;
- Ethereum network fees;
- Token utility;
- Current project activity;
- Regulatory history;
- Broader demand for blockchain security-related crypto assets.
As with any crypto asset, QSP can be volatile and risky. Users should always check the official token contract, liquidity, provider fees, supported networks, wallet compatibility, and personal risk tolerance before buying.
Where Can I Buy Quantstamp (QSP) - 10 Best Crypto Wallets
1. Walletverse
Walletverse is a mobile self-custody crypto wallet created for users who want to buy, store, send, receive, and exchange crypto in one app.
It supports 700+ cryptocurrencies and gives users access to Web3 tools, DeFi features, dApps, multi-account management, fiat on-ramp options, and crypto swaps.
For users who want to buy Quantstamp (QSP) with fiat, Walletverse can be used as a practical starting point.
If QSP is available through the selected provider or swap route, users can buy or exchange it directly inside the app.
If direct QSP buying is unavailable, users may buy ETH, USDC, USDT or another supported asset with Apple Pay, Google Pay, credit card, debit card, or a local fiat provider, then swap it to QSP through a compatible Ethereum route.
Walletverse is non-custodial.
This means users control their own assets, while private keys remain under their control.
The Walletverse team cannot access user funds.
The app also includes passcode and biometric authentication, AML and KYT checks, Solana, ETH and TRX staking, and a proprietary GasFree USDT Transaction System on TRON.
This GasFree feature allows users to transfer USDT on TRON without holding TRX, because fees can be paid directly in USDT.
Pros
- Beginner-friendly mobile interface;
- Supports 700+ cryptocurrencies;
- Self-custody structure with user-controlled assets;
- Apple Pay, Google Pay, cards, and multiple fiat currencies;
- Passcode and biometric security;
- Built-in swaps, dApps, Web3 access, staking, and multi-account support;
- GasFree USDT transfers on TRON.
Cons
- Mobile-only experience;
- Direct QSP availability depends on providers, liquidity, and network support;
- Users must protect their recovery phrase because the wallet is self-custodial.
2. Trezor
Trezor Suite is the wallet interface for Trezor hardware wallets.
Trezor devices can be used to store Ethereum-style tokens through compatible interfaces.
For QSP users, Trezor may be useful if the priority is secure storage rather than fast mobile trading.
Users can buy QSP through an exchange or fiat provider and then move it to a supported self-custody setup.
Pros
- Hardware wallet protection;
- Strong focus on self-custody;
- Useful for long-term holders;
- Private keys stay offline.
Cons
- Requires a hardware wallet purchase;
- Less convenient for quick mobile purchases;
- Users must carefully manage backup and recovery details.
3. Trust Wallet
Trust Wallet is a multi-chain self-custody wallet that supports many blockchains and Ethereum-based tokens.
It offers token storage, swaps, fiat buying, dApp access, and NFT support.
For users who want to buy QSP, Trust Wallet may be useful if they want one mobile wallet for many crypto assets.
Users can buy ETH or stablecoins with fiat through supported providers, then swap to QSP if a suitable route is available.
Pros
- Supports many blockchains and assets;
- Self-custody wallet model;
- Apple Pay, Google Pay, cards, and bank transfer support through partners;
- Good for users with multi-chain portfolios;
- Includes swaps and Web3 access.
Cons
- Fees vary by third-party provider;
- Direct QSP buying may not be available in every region;
- Users must carefully check whether they are using the correct Ethereum token.
4. Rabby Wallet
Rabby Wallet is an EVM-focused self-custody wallet designed for DeFi users.
It supports Ethereum and many other EVM-compatible chains.
Rabby provides transaction simulation, risk warnings, and clearer signing information than many older browser wallets.
For QSP users, Rabby may be useful when interacting with Ethereum swaps, token approvals, and decentralized exchanges.
It is especially helpful for users who want more visibility before signing transactions.
Pros
- Strong Ethereum and EVM support;
- Transaction simulation and risk alerts;
- Good for DeFi users;
- Helpful for checking approvals and contract interactions.
Cons
- More suitable for browser and desktop users than mobile-first beginners;
- Fiat buying options are less central than in some mobile wallets;
- Direct QSP access depends on available routes and liquidity.
5. SafePal
SafePal offers mobile, browser extension, and hardware wallet options.
It supports many blockchains and tokens, including Ethereum-based assets.
SafePal includes buy, sell, swap, DeFi access, and hardware wallet protection for users who want more security.
For QSP users, SafePal may be useful if they want software wallet convenience with the option to add hardware protection.
Pros
- Software and hardware wallet options;
- Supports many blockchains and tokens;
- Built-in buy, sell, swap, and DeFi tools;
- Suitable for users who want stronger storage protection.
Cons
- Hardware wallet setup takes extra time;
- Direct QSP buying may require a swap route;
- Users must check chain and contract details before transfers.
6. Exodus
Exodus is a self-custody wallet available on mobile, desktop, and browser.
It supports many crypto assets and provides buying, sending, receiving, swaps, staking for selected assets, and portfolio tracking.
For QSP users, Exodus may be useful if they want a simple multi-platform wallet experience.
Users may buy ETH, USDC or another supported asset with fiat and then exchange it to QSP if a route is available.
Pros
- Easy interface for beginners;
- Mobile, desktop, and browser options;
- Supports many crypto assets;
- Built-in buy and swap features;
- Useful portfolio tracking tools.
Cons
- Advanced DeFi users may prefer MetaMask or Rabby;
- Direct QSP support should be checked before purchase;
- Swap and fiat fees depend on integrated providers.
7. Ledger Live
Ledger Live is the companion app for Ledger hardware wallets.
It can be used to manage many crypto assets and Ethereum-based tokens, depending on network and token support.
For QSP holders, Ledger may be useful if they want stronger long-term storage protection.
Users may buy QSP through an exchange or compatible swap route and then store it with hardware wallet security on Ethereum.
Pros
- Hardware wallet security;
- Good for long-term storage;
- Supports many Ethereum-compatible assets through connected wallets;
- Private keys remain offline.
Cons
- Requires buying a hardware device;
- Less convenient for frequent small transactions;
- Token visibility may require adding custom assets or using a connected wallet.
8. MetaMask
MetaMask is one of the most widely used self-custody wallets for Ethereum and EVM-compatible networks.
Because QSP is an ERC-20 token, MetaMask can be useful for users who want to manage Quantstamp directly on Ethereum.
Users may buy ETH, USDC or USDT through supported providers, then swap to QSP through a compatible decentralized exchange route if liquidity is available.
MetaMask also allows users to manually import a token contract.
This can be useful when older tokens do not automatically appear in the wallet interface.
Pros
- Strong Ethereum support;
- Works with many decentralized exchanges;
- Allows manual token import by contract address;
- Good for users who understand DeFi and self-custody;
- Large ecosystem of dApps and wallet tools.
Cons
- Beginners may find gas fees and approvals confusing;
- Fiat buying fees depend on third-party providers;
- Users must manually verify contract addresses and avoid fake tokens.
9. Coinbase Wallet
Coinbase Wallet is a self-custody wallet from Coinbase.
It supports Ethereum and several other major networks.
For QSP users, Coinbase Wallet may be useful because it can connect exchange-based buying with self-custody storage and Web3 access.
Users may buy ETH or another supported asset, move it to Coinbase Wallet, and swap into QSP through a compatible route if available.
Coinbase also provides public information about Quantstamp, its Ethereum network, and QSP token utility, which can help users research the asset before buying.
Pros
- Self-custody wallet from a well-known crypto brand;
- Supports Ethereum and major Web3 networks;
- Useful for users who already use Coinbase;
- Good connection between exchange buying and wallet storage.
Cons
- Direct QSP support may vary by region and product route;
- Some users may need to move funds between Coinbase and Coinbase Wallet;
- Users still need to verify token contracts carefully.
10. OKX Wallet
OKX Wallet is a Web3 wallet connected to the broader OKX ecosystem.
It supports Ethereum, Arbitrum, BNB Chain, Polygon, Solana, and many other networks.
For QSP buyers, OKX Wallet may be useful because it combines wallet management, swaps, DeFi access, and exchange-style tools.
Users may buy crypto with fiat where supported, then swap into QSP if a suitable Ethereum route is available.
Pros
- Supports many EVM and non-EVM networks;
- Strong Web3 and DeFi functionality;
- Integrated wallet and exchange ecosystem;
- Useful for active users comparing routes and liquidity.
Cons
- Some services may be unavailable in certain regions;
- Interface may feel complex for beginners;
- Users should understand the difference between exchange custody and wallet self-custody.
Buy Quantstamp (QSP) with Apple Pay
Buying Quantstamp with Apple Pay can be convenient for users who want a fast mobile checkout experience.
The exact process depends on the wallet, fiat provider, exchange, country, and QSP availability.
Some providers may support QSP directly.
In many cases, users may need to buy ETH, USDC, USDT or another supported asset first and then swap to QSP afterward.
A typical Apple Pay flow looks like this:
- Install a crypto wallet that supports Ethereum-based assets, such as Walletverse, MetaMask, Trust Wallet, Coinbase Wallet, OKX Wallet or another compatible wallet.
- Create or import a wallet.
- Save the recovery phrase offline and never share it with anyone.
- Open the Buy section.
- Choose QSP if it is available.
- If QSP is unavailable, buy ETH, USDC or USDT.
- Select Apple Pay as the payment method.
- Complete identity verification if the provider requires it.
- Review the final quote, including provider fees and spread.
- Confirm the payment.
- Swap the purchased asset to QSP through a supported Ethereum route.
- Check that QSP arrives in the correct wallet address and on the correct network.
Walletverse can be useful for this process because it supports mobile crypto buying through Apple Pay, cards, local providers, and fiat currencies such as USD, EUR, GBP, CAD, AUD, INR, KZT, JPY and more.
Before confirming the payment, always review the total cost.
The final amount may include provider fees, Ethereum network fees, spread, and payment-processing charges.
Buy Quantstamp (QSP) with Google Pay
Google Pay can help Android users buy crypto faster through supported wallets and fiat providers.
The process is similar to Apple Pay.
Users choose a wallet or platform, select QSP if available, choose Google Pay, review the quote, and confirm the transaction.
If QSP is not available directly, users can buy ETH, USDC or USDT first and then swap it to QSP through a supported Ethereum route.
A typical Google Pay flow looks like this:
- Download a compatible wallet, such as Walletverse, MetaMask, Trust Wallet, OKX Wallet, SafePal or another wallet that supports Ethereum-based assets.
- Create a wallet and protect it with a passcode and biometrics.
- Store the recovery phrase securely offline.
- Open the Buy section.
- Select QSP if it is available.
- If QSP is unavailable, buy ETH, USDC or USDT first.
- Choose Google Pay as the payment method.
- Complete verification if required.
- Confirm the quote.
- Complete the purchase.
- Swap the purchased asset to QSP.
- Check that QSP arrives in the correct wallet address and on the correct network.
Walletverse supports Google Pay and other fiat payment options, which can make it convenient for users who prefer a mobile-first crypto experience.
Availability depends on country, provider, liquidity, compliance checks, payment method, asset support, and Ethereum network conditions.
How to Buy Quantstamp (QSP) with Fiat?
The easiest way to buy Quantstamp with fiat is to use a wallet, exchange, or fiat provider that supports QSP or compatible Ethereum assets.
Because QSP may not be directly available through every provider, users often choose one of two routes.
The first route is direct purchase.
If your provider supports QSP directly, you can select QSP, choose USD, EUR, GBP or another fiat currency, pay with Apple Pay, Google Pay, card or bank transfer, and receive QSP in your wallet or exchange account.
The second route is indirect purchase.
If direct QSP buying is unavailable, you can buy ETH, USDC or USDT with fiat, then swap it to QSP through a compatible exchange, wallet, or decentralized liquidity route.
Here is a simple step-by-step process:
- Choose a wallet or exchange that supports QSP or Ethereum-based assets.
- Confirm that the asset is Quantstamp with the QSP ticker.
- Check the Ethereum contract address.
- Create an account or wallet.
- Complete identity verification if the fiat provider requires it.
- Select a fiat currency such as USD, EUR, GBP, CAD, AUD, INR, KZT or JPY.
- Buy QSP directly if available.
- If QSP is unavailable, buy ETH, USDC or USDT.
- Transfer funds to a self-custody wallet if buying through an exchange.
- Open the swap section.
- Swap the purchased asset to QSP through a route with enough liquidity.
- Store QSP in a secure self-custody wallet.
- Keep ETH available for Ethereum network fees.
For beginners, Walletverse may be a practical choice because it combines fiat buying, self-custody, swaps, Web3 access, biometric protection, and support for many crypto assets in one mobile app.
For users focused on Ethereum and DeFi, MetaMask, Rabby, Coinbase Wallet, Trust Wallet, OKX Wallet, SafePal, Ledger, and Trezor may also be useful.
For users who prefer exchange liquidity first, centralized platforms listed by market aggregators may provide another route, followed by withdrawal to a self-custody wallet.
Conclusion
Quantstamp (QSP) is an Ethereum-based token connected to smart contract audits, blockchain security, decentralized verification, and the original Quantstamp security protocol.
Quantstamp as a company remains known for Web3 security work, while QSP is an older token with its own history, utility model, and regulatory background.
Users who want to buy QSP with USD, EUR or other fiat currencies can usually try two routes.
They can buy QSP directly if a provider supports it, or they can buy ETH, USDC or USDT first and swap to QSP through a compatible Ethereum route.
Walletverse is a convenient mobile option for users who want fiat buying, self-custody, Apple Pay, Google Pay, card payments, swaps, Web3 access, and security features in one app.
At the same time, Ethereum-focused wallets such as MetaMask and Rabby, multi-chain wallets such as Trust Wallet and OKX Wallet, and hardware wallets such as Ledger and Trezor may also be useful depending on user needs.
Before buying QSP, always check the token contract, network, provider fees, liquidity, wallet support, token history, and risk level.
Data current as of June 18, 2026.
FAQ
Most frequent questions and answers
QSP may be interesting for users who research blockchain security, smart contract audits, Ethereum tokens, automated verification, and older Web3 infrastructure projects. However, QSP is still a risky crypto asset, so users should evaluate liquidity, current utility, regulatory history, exchange support, token contract data, and personal risk tolerance before buying.
You can buy QSP with USD directly if your wallet, exchange, or fiat provider supports it. If direct QSP buying is unavailable, you can buy ETH, USDC or USDT with USD through Walletverse or another compatible wallet, then swap it to QSP through a supported Ethereum route.
You can use a wallet that supports Ethereum-based tokens. Walletverse is a strong mobile option because it supports self-custody, fiat buying, Apple Pay, Google Pay, card payments, swaps, dApps, biometric security, and 700+ cryptocurrencies.
QSP can be bought through selected centralized exchanges, decentralized exchange routes, and compatible crypto wallets. A common method is to buy QSP directly where supported, or buy ETH, USDC or USDT first and then exchange it to QSP.
The cheapest way depends on your country, payment method, provider fees, spread, exchange liquidity, Ethereum network fees, and withdrawal fees. In many cases, a bank transfer or low-fee exchange route may be cheaper than instant card purchases, while Walletverse can be convenient for users who prioritize mobile buying and self-custody.
Yes, Apple Pay may be available through supported wallets and fiat providers. Walletverse supports Apple Pay for buying crypto, and users may then buy or swap to QSP if a suitable route is available.
Yes, Google Pay may be available through supported Android wallets and fiat providers. Walletverse supports Google Pay for crypto purchases, although direct QSP availability depends on provider support, country, liquidity, and token route.
Yes, QSP is commonly listed as an Ethereum ERC-20 token. Users should always verify the exact contract address before buying, sending or swapping it.
The Ethereum contract address listed for Quantstamp (QSP) is 0x99ea4dB9EE77ACD40B119BD1dC4E33e1C070b80d. Always verify the address before buying because fake tokens can use the same name or ticker.
Walletverse can be useful for beginners because it combines a simple mobile interface, fiat buying, self-custody, swaps, biometric protection, and support for many cryptocurrencies. Users should still check whether QSP is available directly or whether they need to buy ETH, USDC or USDT first and then swap to QSP.
