Build a marketplace
for Web3 & Crypto.
Built for Web3, blockchain, and cryptocurrency companies.
We build marketplace platforms with listings, roles, payments, and admin tools built in.
Why Web3 & Crypto companies
struggle with this.
Wallet authentication and Web3 identity flows that standard auth tools don't support
On-chain data indexing and analytics with no off-the-shelf solution
Smart contract interaction UIs that need to handle complex transaction flows
Cross-chain compatibility requirements that multiply integration complexity
BUILD IT FAST
We solve these problems for Web3 & Crypto
Greta specializes in build a marketplace that fit web3 workflows. No generic tools, no compromises.
TALK TO A FOUNDER
Not sure where to start?
Book a 20-minute call. We'll map out your scope, tech stack, and go-to-market plan — for free.
How we build it
for Web3 & Crypto.
Smart contract interactions, token-gated access, and on-chain analytics require custom code from the ground up. Generic web2 tools can't be adapted for decentralized identity, wallet authentication, or multi-chain data.
Web3 products require deep blockchain integrations, wallet connectivity, and on-chain data indexing that no mainstream SaaS tool supports natively.
Purpose-built for two-sided dynamics — not a generic CRUD app
Marketplace payments including platform fee logic and seller payouts
Built to validate your model before investing in a large engineering team
Industry context built in — not bolted on
What you get.
Two-sided marketplace with buyer and seller flows
Listings system with categories, filters, and search
Payments with platform fee and payout logic
Seller dashboard for managing listings and orders
Admin panel for platform operations and moderation
What Web3 & Crypto companies
build with us.
DeFi dashboards
Build portfolio trackers, yield analytics, and liquidity management tools for DeFi protocols.
NFT and token platforms
Create minting, trading, and community tools for NFT collections or token ecosystems.
DAO management tools
Build governance dashboards, proposal systems, and treasury management for DAOs.
BUILD IT FAST
Ready to build for Web3 & Crypto?
Get a build a marketplace scoped, priced, and launched in 4–10 weeks. Let's start with a free conversation.
TALK TO A FOUNDER
Not sure where to start?
Book a 20-minute call. We'll map out your scope, tech stack, and go-to-market plan — for free.
How we work.
Define the platform model
Map your buyers, sellers, listing types, and transaction or payout logic.
Structure the experience
Design discovery, listing creation, transaction, and admin flows.
Build the core system
Ship listings, roles, payments, and the marketplace operations layer.
Launch and validate
Go live, attract first users on both sides, and validate supply-demand fit.
Define the platform model
Map your buyers, sellers, listing types, and transaction or payout logic.
Structure the experience
Design discovery, listing creation, transaction, and admin flows.
Build the core system
Ship listings, roles, payments, and the marketplace operations layer.
Launch and validate
Go live, attract first users on both sides, and validate supply-demand fit.
Ready to build a marketplace for Web3 & Crypto?
Typical timeline: 4–10 weeks
What is Build a Marketplace for Web3 & Crypto?
Build a Marketplace for Web3 & Crypto means building a marketplace specifically designed around the workflows, compliance expectations, and user needs of Web3, blockchain, and cryptocurrency companies. Unlike generic software or off-the-shelf tools, a custom-built solution gives your team full control over features, data, and the product roadmap — without paying for capabilities you don't need or working around limitations that slow you down.
Web3 products require deep blockchain integrations, wallet connectivity, and on-chain data indexing that no mainstream SaaS tool supports natively.
Why Web3 & Crypto companies need custom build a marketplace
Smart contract interactions, token-gated access, and on-chain analytics require custom code from the ground up. Generic web2 tools can't be adapted for decentralized identity, wallet authentication, or multi-chain data.
Most web3 teams start with generic tools because they're fast to deploy. But as the business grows, those tools create friction — missing the specific logic, integrations, and workflows that web3 operations actually need. A custom-built product eliminates that friction permanently.
How long does it take to build?
Web3 MVPs can ship in 5–8 weeks. Full DeFi or DAO platforms with multi-chain support take 10–18 weeks. The timeline depends on scope, the number of user types, and the depth of integrations with existing web3 systems. A well-scoped project with clear requirements moves significantly faster than one that evolves through the build. We scope tightly before starting so timelines stay predictable.
What does it cost?
Web3 builds range from $12k–$55k depending on chain integrations, smart contract complexity, and real-time on-chain data requirements. The biggest cost drivers are integration complexity, the number of distinct user roles, and whether the product needs to handle regulated data or compliance workflows. We provide a clear scope and fixed-price quote before any work begins.
Custom build vs. off-the-shelf tools
Off-the-shelf tools work well for standard use cases. But web3 companies often have requirements that generic SaaS tools weren't built for: wallet authentication and web3 identity flows that standard auth tools don't support, on-chain data indexing and analytics with no off-the-shelf solution, or workflows that don't fit the assumptions baked into general-purpose platforms.
A custom-built product gives you:
- Full ownership — no per-seat fees or platform lock-in
- Workflows built exactly for how web3 teams operate
- Integrations with the tools and data sources you already use
- A foundation you can extend as your product and team grow
The right time to build custom is when generic tools are creating real friction, costing more in workarounds than a custom build would cost, or blocking product-critical workflows that your web3 business depends on.
BUILD IT FAST
From idea to production in 4–10 weeks
Greta's process is proven. We've shipped 50+ Web3 & Crypto products. See how we can accelerate your timeline.
TALK TO A FOUNDER
Not sure where to start?
Book a 20-minute call. We'll map out your scope, tech stack, and go-to-market plan — for free.
Web3 & Crypto MVP questions answered
How do you handle wallet authentication in Web3 applications?+
MetaMask, WalletConnect, Magic, or Phantom for SOL. Users sign a message with private key (proves ownership). No password needed. Gas fees apply only for on-chain transactions. Off-chain login is free. We support EVM chains (Ethereum, Polygon, Arbitrum) and Solana.
Can you build smart contract interactions into Web3 MVPs?+
Yes. We use ethers.js or Web3.js to interact with contracts. Reading data (balances, prices) is free. Writing data (token transfers, swaps) requires gas fees. We encode contract ABIs into the UI so users can call functions from the app. Complexity depends on contract logic.
What's the timeline for a Web3 MVP with multi-chain support?+
Single-chain MVP (Ethereum or Solana): 5–8 weeks. Multi-chain (Ethereum + Polygon + Solana): 10–14 weeks. Each chain requires separate contract deployments and UI logic. We handle chain detection and wallet switching automatically.
How do you handle gas fees and transaction costs in Web3 apps?+
Gas is paid by users directly from their wallet. You can't hide it. We show estimated gas before transactions so users decide. On Polygon and Arbitrum, gas is <$0.01. On Ethereum mainnet, it varies ($1–$50+ depending on congestion). Layer 2s are the move for cheap UX.
Can you build on-chain data dashboards with real-time updates?+
Yes. The Graph indexes blockchain data (free queries). We listen to contract events via WebSockets (Alchemy, QuickNode provide JSON-RPC endpoints). Data updates within 1–2 blocks (~15 seconds on Ethereum). DeFi dashboards, portfolio trackers, transaction monitors all work this way.
How much does a Web3 MVP cost?+
Simple token tracker or swap interface: $12K–$20K. DeFi dashboard with wallet integration: $20K–$35K. Full DAO governance platform: $40K–$55K. Add $5K–$10K for smart contract audit if security-critical.
Do you deploy smart contracts or just build the UI?+
We build the UI and interactions. Smart contract deployment is your responsibility (or we can help deploy existing contracts). If you need custom contracts, hire specialized solidity developers — that's not our core offering. We excel at connecting UI to contracts.
How do you ensure security in Web3 applications?+
Don't store private keys (users keep them in wallet). Don't allow users to input contract addresses (use verified registries). Validate contract ABIs. Use audited contracts. For DeFi: rate-limit transactions, show warnings, encourage audits. Security is shared: you provide solid contracts, we provide solid UI.
Ready to build
for Web3 & Crypto?
We build marketplace platforms with listings, roles, payments, and admin tools built in. Scoped for Web3, blockchain, and cryptocurrency companies.