cowchain
Modular Appchains & Rollups — Your Own Chain, Built by Cowchain
For teams that need a performant chain without building an L1 from scratch. We design, build and ship rollups and appchains — and rescue stalled builds.
Trusted by teams we've shipped for
Web3 products shipped
moved & raised on-chain
wallets created for clients
blockchains integrated
In short
Cowchain builds appchains and rollups end to end — OP Stack, Arbitrum Orbit and ZK stacks, rollups-as-a-service, data-availability integration (Celestia-style), sequencers, bridges and chain tooling — so you get your own performant chain without building an L1 from scratch.
Reviewed by the Cowchain Engineering Team · Published June 4, 2026
Why now
0+production rollups now run on shared stacks — you don't need to build an L1.
The modular stack made launching your own chain practical. Rollups-as-a-service and shared frameworks — OP Stack, Arbitrum Orbit, ZK stacks — plus Celestia-style data availability let teams ship a performant appchain in weeks, not years. Over a hundred rollups already run in production; the question is no longer whether to launch a chain, but which stack.
Source: L2BEAT — Scaling summaryWhat we build
Everything from stack selection to a live, monitored chain.
Rollup / appchain
Launch on OP Stack, Arbitrum Orbit or a ZK stack.
Data availability
Celestia-style DA or Ethereum blobs for cost vs security.
Sequencer setup
Centralised-to-decentralised sequencer path.
Canonical bridge
Secure deposit/withdraw bridge to the settlement layer.
Custom gas token
Use your own token for gas where the stack allows.
Precompiles / custom modules
App-specific logic at the chain level.
Block explorer & RPC
Explorer, RPC and indexing for your chain.
Validator / node ops
Node deployment, monitoring and upgrades.
Which stack fits you?
The framework drives your security model, cost and time-to-launch. Here's the comparison.
| Stack | Type | Best for | Key build considerations |
|---|---|---|---|
| OP Stack | Optimistic rollup | Fast launch, Superchain | Fraud proofs, DA choice, sequencer |
| Arbitrum Orbit | Optimistic L2/L3 | Custom gas, Orbit ecosystem | Settlement layer, AnyTrust vs rollup |
| ZK stack | ZK rollup | Fast finality, validity proofs | Prover infra, cost, complexity |
| Celestia DA | Modular DA | Cheap data availability | DA security, bridge, light clients |
We help you choose the stack and DA in discovery based on cost, security and ecosystem.
Ready to build Modular / Appchains / Rollups?
Get a straight answer on scope, timeline and cost — from the team that builds it.
How we build it
From stack selection to a monitored mainnet chain.
- 01
Discovery & stack selection
Choose framework, DA and settlement layer.
- 02
Architecture
Sequencer, bridge, gas token and module design.
- 03
Chain build
Deploy the rollup, bridge and custom modules; testnet.
- 04
Security audit
Audit bridge and custom logic before mainnet.
- 05
Tooling & integration
Explorer, RPC, indexing and dApps wired in.
- 06
Mainnet & node ops
Launch, run nodes and monitor the chain.
Proof
Hybrid
We built Hybrid — performant chain infrastructure that processed 1B+ testnet transactions, created 4.3M+ unique wallets in five weeks and built a 440K+ community, demonstrating chain-level scalability done right.
Read the case studytestnet transactions
unique wallets in 5 weeks
community subscribers
chain infra (Geth-based)
“Cowchain delivered chain infrastructure that held up at a scale most testnets never see.”
Who we build for
Fintechs & neobanks
Branded stablecoins, payments and embedded wallets.
Banks & institutions
Compliant tokenization, custody and settlement rails.
Funds & asset managers
Tokenized treasuries, credit and RWA products.
Exchanges & trading venues
Perp DEXs, orderbooks and trading terminals.
Payment & remittance
Cross-border settlement and on/off-ramps.
Web3 startups & founders
From architecture to mainnet — and rescues.
Enterprises & brands
Token launches, loyalty and consumer onchain UX.
Telegram & consumer apps
TON mini-apps, AA wallets and viral distribution.
Tech stack & chains
Modular frameworks and DA layers for production chains.
- OP Stack
- Arbitrum Orbit
- ZK stacks
- Celestia
- Geth
- Ethereum (settlement)
- Cosmos SDK
- Audited bridges
Why Cowchain
We rescue stalled builds
Inherited a half-finished contract or a deadlocked codebase? We audit, stabilise and ship it — not just greenfield work.
Founder-led & fast
You talk to the people building it. Tight loops, weekly demos, no account-manager telephone game.
Web3-native team
Years across DeFi, payments, NFTs and infra — 30+ shipped products, not a pivoted Web2 shop.
Security-first
Audit-ready contracts, threat modelling and monitoring baked into the process, not bolted on at the end.
FREQUENTLY ASKED QUESTIONS
Launch your chain
Tell us what you're building. You'll get a straight answer on scope, timeline and cost from the people who'll actually build it — not a sales deck.
- Founder-led team · we design, build and ship
- We also rescue stalled builds
- Clutch 5.0 · 32 reviews
