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Greta.Agency
Build a Marketplace/Web3 & Crypto

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.

Launch both sides of the marketBuilt-in platform fee logicReady to scale listings and users4–10 weeks
The problem

Why Web3 & Crypto companies struggle with this.

1

Wallet authentication and Web3 identity flows that standard auth tools don't support

2

On-chain data indexing and analytics with no off-the-shelf solution

3

Smart contract interaction UIs that need to handle complex transaction flows

4

Cross-chain compatibility requirements that multiply integration complexity

The solution

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

Deliverables

What you get.

01

Two-sided marketplace with buyer and seller flows

02

Listings system with categories, filters, and search

03

Payments with platform fee and payout logic

04

Seller dashboard for managing listings and orders

05

Admin panel for platform operations and moderation

Use cases

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.

Process

How we work.

01

Define the platform model

Map your buyers, sellers, listing types, and transaction or payout logic.

02

Structure the experience

Design discovery, listing creation, transaction, and admin flows.

03

Build the core system

Ship listings, roles, payments, and the marketplace operations layer.

04

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

About this service

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.

Start your project

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.