Blockchain Development Company

Blockchain Development Services Built for Mainnet

Audited smart contracts, dApps, tokenization platforms and enterprise ledgers on Ethereum, Layer 2s, Solana and Hyperledger Fabric. Designed, secured and shipped by one team, and connected to the systems your business already runs.

Book a Free Feasibility Review Explore services
EthereumArbitrumBasePolygonSolanaHyperledger

Trusted by teams worldwide

Connexate Meshmedia Oaky Setia Haruman Wave Sugar

In short

What are blockchain development services?

Blockchain development services cover designing, building, testing and running software that records transactions on a distributed ledger. That includes the smart contracts that hold the rules and the value, the web and mobile apps people use to interact with them, the wallets and integrations that connect them to existing systems, and the security work that has to happen before anything reaches mainnet.

A smart contract cannot be patched like a web server once it is live and holding funds, so most of the engineering effort goes into design, testing and review rather than writing code. Appther runs blockchain work through the same security-first process we use across our custom software development, under an ISO/IEC 27001-certified information security management system.

Our Blockchain Development Services

Eight service lines, from a single token contract to a network shared by several companies. Pick one to see what we build and how it looks in practice. Need engineers inside your own team instead? See hire blockchain engineers.

Our Services

Vault.sol
contract Vault is ERC4626, AccessControl {
  function deposit(uint256 assets, address to)
    public whenNotPaused nonReentrant
    returns (uint256 shares) { ... }
}
✓ 142 tests · 0 high findings
01 · Service line

Smart Contract Development

  • Solidity and Rust contracts for tokens, vaults, escrow and registries
  • ERC-20, ERC-721, ERC-1155 and ERC-4626 standards on audited OpenZeppelin bases
  • Upgradeable proxies behind timelocks, or immutable contracts where trust demands it
  • Unit, fuzz and invariant tests written alongside the code, not after it
Connect a wallet
MetaMaskWalletConnectEmail login gasless
TransactionMint pass #0412Confirmed · Base
02 · Service line

dApp & Web3 App Development

  • React and Next.js front ends with wallet connection and clear signing prompts
  • iOS and Android Web3 apps, sharing logic with our mobile app team
  • Embedded wallets and gasless transactions so users never need to buy gas first
  • Indexing with The Graph so screens load in milliseconds, not block times
AssetOffice tower, Unit 12Valuation $2.4M
Sold 35%AvailableKYC-gated transfers
03 · Service line

Tokenization & Real-World Assets

  • Asset, fund and security tokens with transfer restrictions built in
  • Investor onboarding with KYC and whitelist checks before any transfer
  • Distributions, dividends and cap-table registry handled on-chain
  • Admin dashboards for compliance teams, not only for engineers
Stablecoin vault$4.2M TVL
OracleChainlink ✓Health factor1.82Admin3-of-5 multisig
04 · Service line

DeFi & Digital Payments

  • Staking, vaults and lending logic with liquidation safeguards
  • Stablecoin payment, payout and settlement rails
  • Chainlink price feeds with staleness and deviation checks
  • Pause switches, rate limits and treasury multisig from day one
#00120.08 ETH
#0207Listed
#03180.12 ETH
#0451Sold
ERC-721 · EIP-2981 royalties
05 · Service line

NFT Platforms & Marketplaces

  • Collections, lazy minting and reveal mechanics that resist front-running
  • Marketplaces with listings, offers, royalties and creator payouts
  • Metadata on IPFS so the asset outlives any single server
  • Loyalty passes and ticketing where NFTs replace a database row
Hyperledger Fabric · private channels
06 · Service line

Enterprise & Private Blockchain

  • Hyperledger Fabric networks with private channels per relationship
  • Permissioned EVM chains when partners need Ethereum tooling
  • Chaincode in Go or Node.js, with roles mapped to real organisations
  • Traceability and audit trails that regulators and partners can verify
Treasury transfer250,000 USDC
CFO ✓CTO ✓COO
2 of 3 signatures · executes after 24h timelock
07 · Service line

Wallets, Custody & Integration

  • Multisig treasuries with timelocked execution for company funds
  • Integrations with custody and wallet providers instead of raw key handling
  • Event listeners and reconciliation into ERP, CRM and accounting
  • Monitoring and alerts on contract events after launch
Security review · v1.2
CriticalReentrancy in withdraw()Fixed
HighUnchecked oracle stalenessFixed
MediumMissing event on role changeFixed
LowGas: cache array lengthFixed
08 · Service line

Smart Contract Audit & Review

  • Review of contracts you already have, before or after deployment
  • Severity-ranked findings with a fix for each one
  • Fuzz and invariant tests added where coverage is thin
  • Preparation and remediation support for an external audit firm
Business Case

What Are the Benefits of Blockchain for Business?

A blockchain is slower and more expensive than a database, so it has to buy something a database cannot. These are the four things it does well.

A record nobody can quietly edit

Once a transaction is confirmed it cannot be changed without everyone seeing it. That makes the ledger itself the audit trail, which is why regulators and partners accept it.

  • Tamper-evident history
  • Fewer reconciliation disputes

Shared truth between companies

When suppliers, banks or partners each keep their own copy, they spend weeks reconciling. One shared ledger replaces the back-and-forth with a single version everyone can check.

  • No duplicate records
  • Faster partner settlement

Automated settlement and payouts

Smart contracts pay out, release escrow or distribute income the moment the agreed conditions are met, without an intermediary holding the money in between.

  • Payouts in minutes, not days
  • Lower intermediary fees

Assets people can own and trade

Tokenization turns property, fund shares or loyalty points into assets that can be split, transferred and held in a user's own wallet, within the rules you set.

  • Fractional ownership
  • Transfer rules enforced in code

Production Systems, Not Testnet Demos

A contract that works on a testnet is not a product. Six disciplines take a blockchain idea to something that holds real value safely, backed by our mobile, API and cloud teams.

[1] Chain selection & token design

Ethereum, a Layer 2, Solana or a private network is chosen on your users, assets and rules, and explained in writing. Token supply, vesting and permissions are designed before any contract is written.

[2] Smart contract engineering

Solidity and Rust written on audited libraries, with upgrade and admin models agreed up front. Gas is optimised where it changes user cost, not as a vanity metric.

[3] Off-chain backend & indexing

Most of a blockchain product is ordinary software. Indexers, APIs and databases make it fast; only the rules that must be shared and tamper-proof go on-chain.

[4] Wallet UX & onboarding

Embedded wallets, social login and gasless transactions remove the steps that lose most first-time users, while experienced users can still bring their own wallet.

[5] Security, testing & audit

Threat model, fuzz and invariant tests, static analysis, internal review and an external audit, with evidence for each step handed to you.

[6] Launch, monitoring & upgrades

Staged mainnet deployment, multisig admin keys, on-chain monitoring and alerts, and a governed path for upgrades after launch.

Free Blockchain Feasibility Review

Not Sure You Need a Blockchain? That Is the Right First Question.

In one call we look at your idea and tell you honestly whether a blockchain adds anything a normal database would not. If it does, you leave with the right chain, an architecture sketch and a budget range. If it does not, we will say so.

Book Your Free Review

Free · No obligation · Written summary within 48 hours

Appther consultants reviewing a blockchain project brief with a client
Decision Guide

When Does a Blockchain Make Sense?

A blockchain earns its cost when several parties who do not fully trust each other need to share one record. If one company controls all the data, a conventional database is faster and cheaper.

Good fit

  • Several companies or users write to the same record
  • Ownership of an asset must be provable and transferable
  • An audit trail must be tamper-evident to outsiders
  • Settlement or payouts should run without a middleman
  • Users want to hold their own assets in their own wallets

Probably not needed

  • One organisation owns and edits all the data
  • Records need to be deleted or changed often
  • Data is highly confidential and cannot be shared at all
  • You need thousands of private writes per second at low cost
  • The main goal is “being on blockchain” for marketing
Our Process

How We Deliver Blockchain Projects, Step by Step

Every phase ends with something you can review. Nothing touches mainnet until the code has passed testing, review and, for anything holding value, an external audit.

1
Week 1–2

Discovery & Threat Model

We confirm a blockchain is the right tool, choose the chain, and map who can move value and how it could go wrong.

2
Week 2–3

Architecture & Token Design

Contract interfaces, upgrade and admin model, tokenomics and the on-chain versus off-chain split are agreed in writing.

3
Week 3–10

Build & Test

Contracts, app and integrations in weekly sprints, with unit, fuzz and invariant tests written alongside the code.

4
Week 9–14

Testnet, Review & Audit

Public testnet deployment, internal security review, external audit and fixes before anything goes live.

5
Launch & after

Mainnet & Monitoring

Staged mainnet launch with multisig-controlled admin keys, on-chain monitoring, alerts and ongoing support.

How We Work

Standards Behind Every Contract

8

Security gates

From threat model to launch controls, with evidence for each one handed over at the end.

6+

Chains supported

Ethereum, Layer 2s, Polygon, BNB Chain, Solana and Hyperledger Fabric, chosen on fit.

100%

Code & keys yours

Repositories, deployer accounts and admin keys transfer to a multisig you control.

ISO

27001 certified

Delivered under an ISO/IEC 27001-certified information security management system.

Related Work

Secure Payment & Ledger Products We've Shipped

Not blockchain projects, and we will not pretend otherwise. These are the money-moving, ledger-heavy systems where we built the same discipline a blockchain product needs.

Digital wallet app with secure payments, transfers and QR checkout
CASE STUDY
FinTechMobile Money

Digital Wallet: Mobile Money for Ethiopia

Instant transfers in birr, QR payments and an agent cash-in network, in six languages from day one.

6Languages, day one
<3sP2P transfer
View Case Study
AB Sugar mill running an Odoo ERP implemented by Appther
LIVE IN PRODUCTION
LedgerGrower Payments

AB Sugar: Cane to Cash on One Ledger

Farmer slips, weighbridge, grower payments and dispatch settled against one auditable ledger.

2,400+Farmers paid
11+ERP modules
7,000Tonnes a day
View Case Study
Why Appther

Why Choose Appther for Blockchain Development?

The questions worth asking any team you shortlist, and how we answer them.

We tell you if you don't need one

Our first job is to check whether a blockchain adds anything a normal database would not. If it doesn't, we say so and save you the build.

  • Honest feasibility review
  • Database alternative costed

Security is the project plan

Threat model, fuzz tests, static analysis and an external audit are scheduled into the timeline from week one, not squeezed in before launch.

  • Seven security gates
  • Audit time budgeted

One team, contracts to apps

Contracts, web and mobile apps, backend and integrations are built by one team, so nothing breaks at the hand-off between on-chain and off-chain code.

  • No integration blame gap
  • Mobile, web and cloud in-house

Your keys, your code

Repositories, deployer accounts and admin keys belong to you from the first commit. At launch, admin rights move to a multisig you control.

  • 100% code and IP ownership
  • ISO 27001-certified delivery
Smart Contract Security

How Do We Keep Smart Contracts Secure?

Smart contract bugs are paid for in lost funds, not support tickets. Every contract passes these eight gates before mainnet, and you get the evidence for each one.

Threat model

Who can call what, which keys hold power and what an attacker would try first, written down before code.

  • Roles and privileges mapped
  • Attack paths ranked

Battle-tested libraries

OpenZeppelin and established standards instead of hand-rolled access control, maths or token logic.

  • Audited base contracts
  • Standard interfaces

Unit & integration tests

Every function and every failure path covered, running in CI on each change.

  • Revert paths tested
  • Runs on every commit

Fuzz & invariant tests

Foundry throws millions of random inputs at the contracts and checks the rules that must never break.

  • Property-based testing
  • Invariants on balances

Static analysis

Slither and similar tools catch known vulnerability patterns before a human reviewer starts.

  • Known-bug detection
  • Gas and style checks

Internal review

A second engineer who did not write the code reviews every line against the threat model.

  • Four-eyes on every change
  • Findings tracked to fix

Independent audit

An external audit firm of your choice reviews before mainnet, and every finding is fixed and re-checked.

  • External firm, your choice
  • Remediation included

Launch controls

Multisig admin keys, timelocks on upgrades, pause switches and live monitoring with alerts.

  • Multisig and timelock
  • On-chain alerting
Technologies

The Stack Behind Our Blockchain Builds

Established, well-audited tools only. On a chain, the boring choice is usually the safe one. Pick one to see where it fits.

Solidity & the EVM

The language of Ethereum and every EVM chain: Arbitrum, Optimism, Base, Polygon and BNB Chain. Written on OpenZeppelin, tested with Foundry and Hardhat, and checked with Slither. One codebase can deploy to several EVM chains when your users are spread across them.

Rust & Solana (Anchor)

For high-throughput trading, payments and real-time apps where fees must stay near zero. Anchor gives Solana programs a safer structure, and Rust's type system rules out whole classes of bugs before deployment.

Layer 2 networks

Arbitrum, Optimism and Base process transactions cheaply and settle back to Ethereum for security. The usual home for consumer apps, payments and loyalty, where Ethereum mainnet fees would price users out.

Hyperledger Fabric

A permissioned blockchain for consortia and supply chains where members are known and data stays private. Chaincode in Go or Node.js, private channels per relationship and no gas fees.

Oracles, indexers & storage

Chainlink for prices and outside events, The Graph for fast queries over on-chain data, and IPFS for files and metadata that should outlive any single server.

Wallets & app layer

ethers.js, viem and wagmi on the web, WalletConnect for mobile wallets, embedded wallets for email login, and React, Next.js, Flutter or React Native for the apps people actually use.

Security tooling

Foundry fuzzing and invariant testing, Slither and Aderyn static analysis, Tenderly simulation and monitoring, and Safe multisig for every admin key we hand over.

Platform Guide

Which Blockchain Should You Build On?

There is no best chain, only the right one for your users, your assets and your rules. This is how we usually narrow it down.

Blockchain platforms compared
PlatformTypeContract languageTransaction costBest for
EthereumPublic, Layer 1Solidity, VyperHighestHigh-value assets and DeFi where security and liquidity matter most
Arbitrum, Optimism, BasePublic, Ethereum Layer 2SolidityLowConsumer apps and payments that need Ethereum security at lower fees
Polygon PoSPublic, EVM chainSolidityVery lowNFTs, loyalty and high-volume consumer transactions
BNB ChainPublic, EVM chainSolidityLowApps targeting the BNB user base and exchange ecosystem
SolanaPublic, Layer 1Rust (Anchor)Very lowHigh-throughput trading, payments and real-time apps
Hyperledger FabricPrivate, permissionedGo, Node.js, JavaNo gas feesConsortia and supply chains where members are known and data stays private
Cost & Timeline

How Much Does Blockchain Development Cost?

Indicative ranges for the projects we are asked about most. Your fixed quote comes after discovery, once the scope is written down.

Typical scope

Token or simple smart contract

$8K – $25K

3 to 6 weeks

An ERC-20 or NFT collection contract with tests, deployment scripts and a basic admin panel.

Typical scope

dApp or NFT marketplace

$25K – $70K

8 to 14 weeks

Contracts plus a full web or mobile app, wallet flows, indexing and an admin dashboard.

Most requested

Tokenization platform

$50K – $120K

12 to 18 weeks

Asset tokens with transfer restrictions, investor onboarding, distributions and compliance reporting.

Typical scope

DeFi protocol or enterprise network

$80K – $200K+

16 to 24+ weeks

Multi-contract protocols or permissioned networks with several organisations, integrations and governance.

Ranges exclude third-party costs: external audit fees, gas for deployment, and node or custody provider subscriptions. What moves the price most: the number of contracts, how much value they will hold, the number of chains, and the systems to integrate.

Use Cases

Blockchain Use Cases by Industry

Where a shared, tamper-evident ledger solves a real business problem, and what we build for it. For payment products without a blockchain, see fintech app development.

[01] Finance & FinTech

Programmable money and faster settlement, built to pass a bank's security review.

  • Stablecoin payments and payouts
  • Tokenized funds and bonds
  • Cross-border settlement
  • Escrow and conditional release
  • Proof-of-reserves reporting
Explore Finance and FinTech ›
[02] Supply Chain & Logistics

One shared record from source to shelf that every partner can check.

  • Batch and origin traceability
  • Supplier certificates on-chain
  • Recall and provenance checks
  • Shipment milestone events
  • Partner-only private channels
Explore Supply Chain and Logistics ›
[03] Real Estate

Fractional ownership and cleaner registries for property and rental income.

  • Fractional property tokens
  • Rental income distribution
  • Investor whitelisting
  • Title and lease records
  • Secondary transfer rules
Explore Real Estate ›
[04] Healthcare

Integrity and consent, with patient data itself kept safely off-chain.

  • Consent and access logs
  • Drug supply verification
  • Clinical trial data integrity
  • Credential verification
  • Hashes on-chain, data off-chain
Explore Healthcare ›
[05] Retail & Loyalty

Rewards and product passports customers can actually own.

  • Tokenized loyalty points
  • Product authenticity passports
  • NFT memberships and passes
  • Crypto and stablecoin checkout
  • Partner reward exchange
Explore Retail and Loyalty ›
[06] Education & Credentials

Certificates anyone can verify in seconds, without phoning the issuer.

  • Verifiable degrees and badges
  • Course completion records
  • Issuer and revocation registry
  • Employer verification portal
  • Wallet-held credentials
Explore Education and Credentials ›
Feature Set

Key Features We Build Into Blockchain Products

The building blocks that show up in most blockchain products we scope, from first wallet connection to the controls that protect the treasury.

  • Wallet Connect & Login
  • Email & Social Wallets
  • Gasless Transactions
  • Multisig Admin
  • Timelocked Upgrades
  • Emergency Pause
  • KYC & Whitelists
  • Token Vesting
  • Staking & Rewards
  • On-Chain Governance
  • Event Notifications
  • Indexed Search
  • IPFS Metadata
  • Cross-Chain Bridging
  • Royalties & Fees
  • On-Chain Analytics
  • Proof & Verification
  • Admin Dashboard
Architecture

Blockchain App Architecture, Layer by Layer

Only the rules that must be shared and tamper-proof go on-chain. The other nine layers are what make a blockchain product fast, cheap and usable.

App & Interface

Web and mobile screens that turn signatures and confirmations into something a normal person can follow.

01

Wallet Layer

External wallets, embedded wallets or custody providers, chosen on who your users are.

02

Relayer & Paymaster

Sponsors gas or batches transactions, so users are not asked to buy a token before they start.

03

Smart Contracts

The rules and the value. Small, audited and changed only through governed upgrades.

04

Admin & Governance

Multisig, timelocks and roles that decide who can change what, and how fast.

05

Oracles

Prices and outside events brought on-chain, with checks for stale or manipulated data.

06

Indexer

The Graph or a custom indexer so the app can query history without waiting on the chain.

07

Backend & APIs

Ordinary services for profiles, notifications and anything that does not need to be on-chain.

08

Business Integrations

Event-driven links to ERP, CRM, accounting and payment systems, with reconciliation.

09

Monitoring

Alerts on unusual contract calls, failed transactions and admin actions, around the clock.

10
Client Voices

What Clients Say About Working With Appther

“Appther exceeded every expectation, on time and on budget, and the final product has been instrumental in scaling our business. A rare engineering partner.”
Johnathan Peffer
Johnathan PefferCEO · Bull's Eye Technologies Inc
“Rolling out a platform across our operations felt daunting at first, but Appther made the transition seamless. Every department now works off a single source of truth.”
Pushpender Kumar
Pushpender KumarGeneral Manager · AB Sugar Ltd
“Appther built our student competition platform exactly the way we envisioned it: easy registration, smooth judging, and real-time results that keep participants engaged.”
Dionna Milem
Dionna MilemOwner · My BOB Team LLC
“Building a mental health product means every detail has to be handled with care, and Appther got that from day one. The product feels warm, simple, and genuinely helpful.”
Bob Singhal
Bob SinghalProfessor of Joy · Joyscore Inc
Glossary

Blockchain Terms in Plain English

Smart contract
A program stored on a blockchain that runs exactly as written when someone calls it, and holds or moves assets by its own rules.
dApp
A decentralised application: a normal web or mobile front end whose core logic runs in smart contracts.
Gas
The fee paid to the network to run a transaction or contract call, priced by how much computation it uses.
Layer 2
A network such as Arbitrum or Base that processes transactions cheaply and settles them back to Ethereum for security.
Oracle
A service, such as Chainlink, that brings outside data like prices or events onto the blockchain for contracts to use.
Tokenization
Representing ownership of an asset, such as property, a fund share or loyalty points, as a token on a blockchain.
Smart contract audit
An independent security review of contract code to find vulnerabilities before it is deployed and holds value.
Permissioned blockchain
A private network, such as Hyperledger Fabric, where only approved organisations can join, read and write.
Latest Insights

Reading on Blockchain & FinTech

Background reading from our team on blockchain, digital assets and secure financial products.

All Articles
Free 30-Minute Blockchain Strategy Call

Have a Blockchain Idea? Let’s Pressure-Test It.

One call gets you an honest view on whether a blockchain fits, which chain to use, how to keep it secure, and what it will cost to build. No pitch deck, no obligation.

Chain recommendation Security plan Budget range
Book My Free Call
200+Products delivered
4.9★Clutch rating
ISO 27001Certified security
100%Code and IP yours

Keep exploring

Related services and industries

7 links
Hire Blockchain EngineersServiceFinTech App DevelopmentServiceCustom Software DevelopmentServiceAPI Development & IntegrationServiceFinTechIndustryReal EstateIndustryLogisticsIndustry
FAQ

Blockchain Development FAQ

Updated

Blockchain development services cover choosing the right chain, designing and writing smart contracts, building the web or mobile app users interact with, connecting wallets and existing business systems, security testing and audit preparation, deployment to mainnet, and monitoring and support after launch.
A token or simple smart contract typically costs $8K to $25K. A dApp or NFT marketplace runs $25K to $70K, a tokenization platform $50K to $120K, and a DeFi protocol or multi-company enterprise network $80K to $200K or more. External audit fees, deployment gas and node or custody provider costs are extra. You get a fixed quote after discovery.
A token contract with tests takes about 3 to 6 weeks. A dApp or marketplace takes 8 to 14 weeks, and tokenization platforms, DeFi protocols and enterprise networks take 12 to 24 weeks or more, including testnet deployment, review and an external audit.
It depends on what you are building. Ethereum suits high-value assets and DeFi, Ethereum Layer 2s such as Arbitrum, Optimism and Base suit consumer apps that need low fees, Polygon suits NFTs and loyalty, Solana suits high-throughput trading and payments, and Hyperledger Fabric suits private consortia where members are known. We recommend a chain in discovery based on your users, assets and rules.
Only if several parties who do not fully trust each other need to share one record, if ownership of an asset must be provable and transferable, or if an audit trail has to be tamper-evident to outsiders. If one organisation controls all the data, a conventional database is faster and cheaper, and we will tell you so in the free feasibility review.
Every contract goes through a threat model, uses audited libraries such as OpenZeppelin, and is covered by unit, fuzz and invariant tests in Foundry. Static analysis with Slither and an internal review by a second engineer come next, then an external audit before mainnet. Launch uses multisig admin keys, timelocks on upgrades, pause switches and live monitoring.
We prepare contracts for audit and fix every finding, and we review existing contracts for clients. For anything that will hold significant value we recommend an independent external audit firm in addition to our own review, because a second, separate team catches what the authors miss.
Yes. We build event listeners, APIs and reconciliation jobs that connect smart contracts to ERP, CRM, accounting and payment systems, so on-chain activity updates your business records and your systems can trigger on-chain actions without manual re-entry.
This page is for a delivered project: Appther owns the scope, architecture, security process and delivery for a fixed price. If you already have a team and a plan and just need extra Solidity or Web3 engineers working under your direction, see our hire blockchain engineers service instead.
You do. You own 100% of the source code, contracts, deployment keys and intellectual property. Admin keys are handed over to a multisig you control at launch, and we sign an NDA before discovery if you need one.
An Engineer Replies Within One Business Day

Let's Build Your Blockchain Product

Tell us what you want to put on-chain. An engineer replies with an honest view on fit, chain choice, security and cost. Related: hire blockchain engineers, fintech app development and API development and integration.

Free 30-min strategy callScoping and honest, practical advice.
Fixed-price quoteDetailed scope and price after discovery, no surprises.
NDA on requestYour idea and code always stay yours.
Prefer to talk now?+91 99114 32288 · info@appther.com

Book Your Free Strategy Call

Fields marked * are required. We reply within one business day.

🔒 Your details are never shared. NDA available on request.