CoinFabrik has worked on smart contracts since 2014 from Buenos Aires, and Protofire has built on-chain infrastructure since 2016 with 85+ engineers in 17+ countries. Many web3 agency rankings are paid listings; every firm here was checked on its own site for founding year, location or services. None publishes rates.
Quick answer
For protocol and client-level work, start with Nethermind or ChainSafe. For product builds with audits in-house, talk to CoinFabrik or LimeChain, and for infrastructure on many EVM networks, Protofire.
- 01Nethermind: Deepest Ethereum work
- 02ChainSafe: Open-source client team
- 03Protofire: Infra on many networks
- 04LimeChain: Protocol to MVP
- 05CoinFabrik: Audits since 2014
The 6 best Web3 development companies
Nethermind's project began in 2017, its execution client powers about 30% of Ethereum per its site, and it lists 400+ security audits plus L2 and institutional builds.
- Platforms
- Web
- Launched
- 2017
- Company
- Ethereum client, protocol engineering and security services
- Open source
- Yes, client licensed under GPL and LGPL
- Security audits
- 400+ security audits delivered; formal verification offered
Pros
- Execution client runs about 30% of Ethereum, per its site
- 400+ security audits, including formal verification
- Builds for institutions as well as protocols
Cons
- No published rates
- Leadership changed: new CEO appointed September 2026
Skip it if you need a small app build; it focuses on protocol-level work.
ChainSafe offers protocol development, co-development and infrastructure, and maintains Lodestar, an Apache 2.0 Ethereum consensus client.
- Platforms
- Web
- Open source
- Yes, Lodestar under Apache 2.0
- Company
- ChainSafe Systems: protocol, infrastructure and co-development services
- Chains
- Validators on Celestia, zkVerify, Polkadot, Kusama, ssv.network; ETH via Lido; infra for Ethereum, IPFS, Filecoin
- Security audits
- Lodestar repo audits folder holds a March 2020 utility libraries review
Pros
- Maintains Lodestar, an Apache 2.0 Ethereum client
- Offers co-development from design to deployment
- Also provides RPC and staking infrastructure
Cons
- No published rates
- Founding year not stated on its homepage
Skip it if you need a founding date or rates from its site: neither is listed.
Protofire states 250+ projects across 60+ networks since 2016, 85+ engineers in 17+ countries, and maintains the Solhint linter.
- Platforms
- Web
- Launched
- 2016
- Company
- 85+ engineers across 17+ countries
- Open source
- Solhint linter, MIT License
- Pricing
- Quoted as a range per phase in a written proposal
Pros
- 250+ projects since 2016
- Maintains Solhint, a widely used Solidity linter
- Official Safe partner with 130+ Safes deployed
Cons
- No published rates
- Focus leans to infrastructure over consumer apps
Skip it if you want consumer app design.
LimeChain, started in 2017, builds protocol software, smart contracts in Solidity, Rust and Daml, wallets and dev tools, and offers PoC and MVP builds.
- Platforms
- Web
- Launched
- 2017
- Chains
- Solana, Ethereum, Hedera, Canton
- Company
- Lime Labs Ltd, Sofia, Bulgaria (EIK 204318511)
- Pricing
- Quoted per engagement; LimeForge free during early access
Pros
- Covers protocol work and product builds
- Offers PoC and MVP packages
- Builds public dev tools such as Rollup.codes
Cons
- No published rates
- Contracting entity is Lime Labs Ltd in Sofia, Bulgaria
Skip it if you need an office location: its pages do not state one.
CoinFabrik, headquartered in Buenos Aires with a US regional office, states 500+ projects and 350+ security audits.
- Platforms
- Web
- Launched
- 2014
- Company
- HQ Buenos Aires; offices in Brazil, USA, Spain, Italy
- Pricing
- Per-project audit quote; 50% upfront, 50% on final report; paid in USDT
- Security audits
- Security work for 300+ platforms since 2014; audit reports listed on its site
Pros
- Audits and development from one team
- 500+ projects and 350+ audits, per its site
- Has a US regional office
Cons
- No published rates
- A firm that audits code it also builds should not be your only reviewer
Skip it if you want a separate firm to audit what it builds; get a second reviewer.
Blaize has 65+ blockchain engineers in Kyiv and Dnipro and offers fixed-price projects or a dedicated team, covering dApps, bridges and audits.
- Platforms
- Web
- Company
- Kyiv and Dnipro, Ukraine; 65+ blockchain engineers
- Launched
- Smart contract work since 2016, per its own page; site copyright from 2018
- US availability
- Available: terms name no country restrictions
- Pricing
- Not published; fixed-price projects or dedicated teams on time and materials
Pros
- Offers fixed-price project and dedicated-team models
- 65+ blockchain engineers, per its homepage
- Covers product design, build and audit
Cons
- Team is based in Ukraine, so check time-zone overlap
- No published rates
Skip it if you need same-time-zone work from the US.
Web3 Development Companies compared
Select a name to jump to its review.
| Name | Best for | US availability | Pricing | Security audits |
|---|
| Nethermind | Protocol and L2 teams | Available: AuditAgent terms restrict only sanctioned jurisdictions | AuditAgent AI scanner: $0.05 per billable line of code, pay-per-scan; $50 in credits to start | 400+ security audits delivered; formal verification offered |
|---|
| ChainSafe | Protocol co-development | Available: terms name no country restrictions | Not verified | Lodestar repo audits folder holds a March 2020 utility libraries review |
|---|
| Protofire | DeFi and institutions | Not verified | Quoted as a range per phase in a written proposal | Not verified |
|---|
| LimeChain | Solana, Ethereum, Hedera | Available: terms name no country restrictions | Quoted per engagement; LimeForge free during early access | Not verified |
|---|
| CoinFabrik | Build plus audit | Available: terms restrict only sanctioned jurisdictions | Per-project audit quote; 50% upfront, 50% on final report; paid in USDT | Security work for 300+ platforms since 2014; audit reports listed on its site |
|---|
| Blaize | dApps and DeFi products | Available: terms name no country restrictions | Not published; fixed-price projects or dedicated teams on time and materials | Not verified |
|---|
“Not verified” means we could not confirm the value on the project’s own pages.
How we rank Web3 development companies
- 01Verifiable: founding year, location and services stated on the firm's own site.
- 02Depth: protocol, client or infrastructure work the firm shows.
- 03Open source: public code the firm maintains.
- 04Engagement model: fixed price, team extension or co-development.
No project paid to be listed or ranked. Full rules: methodology.
What we did not test
- We did not open accounts, deposit money or place trades with these services.
- We did not audit smart contracts, reserves or security claims ourselves; we report what the project and its auditors publish.
- Fees, limits and availability change; the list date shows when we last checked them.
Rubric last updated Oct 1, 2026. Crypto assets are not insured by the FDIC or SIPC, and you can lose all the money you put in. This page is educational content, not financial advice.
How to choose
01Ignore rankings you can't trace
Many web3 agency lists are paid placements. Check the firm's own site for a founding year, address and public code.
02Ask to see public code
Nethermind, ChainSafe (Lodestar) and Protofire (Solhint) maintain open-source projects you can read before hiring.
03Keep the audit independent
CoinFabrik and Blaize build and audit. Use a separate auditor for code a firm wrote itself.
Who should skip all of these
- Teams with no budget: all six are paid services with quotes on request.
- Anyone looking for a token launch service: these are engineering firms.
Bottom line
Pick by depth: Nethermind and ChainSafe for protocol work, LimeChain, CoinFabrik and Blaize for product builds, Protofire for multi-network infrastructure.
Get quotes from two; none publishes rates.
Educational content, not financial advice. Crypto assets are volatile; do your own research.
FAQ
How do I tell if a web3 development company is real?
±
Check its own site for a founding year, office address and public code, then ask for client references. We list only firms whose sites state these.
How much does a web3 development company charge?
±
None of the six publishes rates. Blaize offers fixed-price projects; the others quote per engagement.
Which firms do both development and audits?
±
CoinFabrik, Nethermind and Blaize list both. Use an independent auditor for code they wrote.
Are there US-based options?
±
CoinFabrik lists a US regional office; the others here are based elsewhere or do not state a location.
Which firms build Ethereum client software?
±
Nethermind and ChainSafe. Nethermind's execution client, open source under GPL and LGPL, powers about 30% of Ethereum per its site. ChainSafe maintains Lodestar, an Ethereum consensus client under Apache 2.0, plus Forest for Filecoin and Gossamer for Polkadot.
What changed in this list
2026-09-26First version: 6 web3 development firms verified on their own sites.
2026-10-01Added a FAQ on which firms maintain Ethereum clients.
Who made this page
✓
Fact check
Checked against 8 sourcesLast check: Oct 1, 2026
A value we could not confirm on the project’s own pages is marked “Not verified” instead of estimated.
How we review