Contract Specification & Threat Modelling
We turn your business rules into a precise spec and map likely attacks, so the design is secure from the start.
- Contract specification
- Threat model
Emerging Technologies
Smart Contract Development Services
We write, test and audit Solidity and Rust contracts for tokens, escrow and DeFi logic, with formal test suites and security review before anything touches mainnet.
- Solidity & Rust
- Security audits
- Test suites
- Mainnet deployment
- Years of delivery
- 8+
- Years of delivery
- Projects shipped
- 350+
- Projects shipped
- Clients across US, UK, AU & SG
- 200+
- Clients across US, UK, AU & SG
What’s included
Everything You Need to Deploy Smart Contracts You Can Rely On
We specify, write, test, audit and deploy Solidity and Rust contracts, then keep them monitored and upgradeable.
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Solidity, Rust & Vyper Contract Architecture
We plan contract structure, storage and upgrade patterns for Ethereum, Solana or EVM chains that keep gas costs predictable.
- Contract design doc
- Upgrade pattern plan
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ERC-20, ERC-721 & Custom Contract Coding
We write clean, commented contracts for tokens, NFTs, escrow, staking or governance that you fully own.
- Contract source code
- NatSpec documentation
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Unit Testing & Fuzz Testing Suite
Hardhat and Foundry tests with fuzzing cover edge cases, giving you evidence your logic holds under unusual inputs.
- Test coverage report
- Fuzz test results
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Gas Optimisation & Cost Analysis
We trim storage and execution costs so every user transaction is cheaper and your protocol scales more affordably.
- Gas report
- Optimised contracts
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Pre-Audit Review & Vulnerability Remediation
We scan for reentrancy, overflow and access flaws, fix them, and prepare clean code for an independent auditor.
- Static analysis report
- Audit-ready package
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Frontend & Oracle Integration
We connect contracts to your app, Chainlink price feeds and back-office systems so on-chain actions trigger real workflows.
- ABI & SDK
- Oracle integration
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Mainnet Deployment & Contract Monitoring
We deploy, verify on Etherscan and set up event alerts, so you see unusual activity as soon as it occurs.
- Verified contracts
- Alerting dashboard
Need something specific?
Why Kramate
Why Business Owners Choose Kramate for Smart Contracts
A smart contract cannot be easily changed once live, so we take extra care first.
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Your Rules Written Down First
Instead of
code that does not match your deal
With Kramate
We write your business rules in plain words and get your sign-off before any coding.
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Extra Checks Before It Goes Live
Instead of: a small mistake that cannot be undone
With Kramate: A second person reads every line, and we attack our own work to find weak spots.
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The Contracts Belong to You
Instead of: depending on a developer to touch your own code
With Kramate: You get the full source and notes, so any other expert can pick it up.
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Fixed Price, Paid by Milestone
Instead of: open-ended bills for work that drags on
With Kramate: You agree the price first and pay as each piece is finished and shown to you.
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Alerts When Something Looks Odd
Instead of: finding out about a problem days later
With Kramate: After launch, we can watch your contracts and tell you fast if something looks odd.
Our approach
How We Run Your Smart Contract Development, Step by Step
Your business rules become tested contract code that you own and an auditor can check.
7 clear steps 7 deliverables you keep
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Business Rules Spec
We write your rules, payments and approvals in plain language, so everyone agrees what the contract must do.
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Attack Planning
We list the ways someone might try to cheat or break the contract and plan defences for each.
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Writing the Contract
We write the contract in small, commented parts and share each part so you can follow progress.
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Test Suite & Fuzzing
We run thousands of automatic checks, including odd inputs, to see if your rules still hold.
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Security Audit Preparation
We scan for known flaws, fix them and prepare clean notes so an independent auditor can work quickly.
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Live Release
We publish the contract on the live blockchain, show its public code and hand over admin keys safely.
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Activity Alerts
We set up alerts for unusual activity and plan any later upgrades with you.
Tools & technologies
Technologies We Use for Smart Contract Development
Contracts are written, tested and reviewed with the tools security auditors expect.
- Solidity: The main language for writing smart contracts on Ethereum networks.
- Rust: Safe, fast language for Solana programs and device firmware.
- TypeScript: Typed JavaScript that catches mistakes before release.
- Hardhat: Builds, tests and deploys smart contracts before they go live.
- Foundry: Fast toolkit for testing and fuzzing smart contracts.
- OpenZeppelin: Reviewed contract libraries that reduce risk in token and access code.
- GitHub Actions: Automates testing and releases on every code change.
- Ethereum: Widely used smart contract network for tokens, finance and apps.
- Solana: High-speed blockchain for payments, tokens and consumer apps.
- Polygon: Low-fee Ethereum-compatible network for everyday transactions.
- Optimism: Ethereum scaling network with lower fees and faster confirmation.
- BNB Chain: Low-cost network with a large user base for tokens and apps.
- Chainlink: Feeds trusted real-world data, such as prices, into smart contracts.
- Ethers.js: Connects web and server apps to blockchain networks and contracts.
- IPFS: Decentralised file storage for NFT media and app content.
- Alchemy: Managed blockchain node access so you do not run your own servers.
Expert guide
Smart Contract Development Services: A Complete Guide for Businesses
Smart contract development services produce programs that run on a blockchain and apply agreed rules automatically: releasing a payment when a condition is met, issuing a token, or recording a transfer of ownership. Once deployed, the code is public and usually cannot be edited, so mistakes are costly and hard to reverse.
For that reason the work is less about writing code quickly and more about specifying behavior precisely, testing hostile scenarios and arranging independent review before launch.
This guide walks the full lifecycle from written specification to live monitoring, describes common vulnerability classes, explains what an audit does and does not promise, and covers upgrades, regional points for the USA, UK, Australia and Singapore, budgeting and partner selection.
What a smart contract is, and what it is not
Buyers of smart contract development services should first understand the medium. A smart contract is code stored on a blockchain that runs exactly as written when someone sends it a transaction. It is not automatically a legal contract, and it cannot see the outside world by itself. Facts such as a delivery date or a price must be supplied by an external data feed, called an oracle, and that feed becomes part of the trust model.
Because the code is public, anyone can study it for weaknesses, including attackers. The Solidity documentation (opens in a new tab) describes the most widely used language for contracts on Ethereum-compatible networks, including its security considerations.
Where contracts run
| Environment | How contracts are written | Suits |
|---|---|---|
| Ethereum-compatible networks | Solidity and related languages, covered in the Solidity and Ethereum documentation | Tokens, marketplaces, public finance applications |
| Permissioned enterprise ledgers | Business logic often called chaincode in Hyperledger Fabric | Multi-company workflows with known participants |
| Other public networks | Language and tooling vary by network | Specific performance or ecosystem needs |
The Ethereum developer documentation (opens in a new tab) explains how contracts are deployed and executed, and the Hyperledger Fabric documentation (opens in a new tab) covers chaincode on a permissioned network. Platform choice affects tools, talent and cost, so it belongs in the early specification stage.
The lifecycle of smart contract development services
- Specify in plain language. Write who may do what, under which conditions, with which limits. Include what happens when things go wrong.
- Threat model. List how a malicious user, a compromised key or a failing data feed could misuse each function.
- Build on proven components, such as the community-reviewed OpenZeppelin Contracts library (opens in a new tab), rather than rewriting common logic.
- Test thoroughly, including unit tests, property-based tests and simulations of attack scenarios.
- Independent review by a separate security team, then fix and re-test.
- Staged deployment to a test network first, then a limited launch with capped amounts.
- Monitor the live contract and keep a response plan.
Common vulnerability classes
The OWASP Smart Contract Top 10 (opens in a new tab) ranks frequent causes of loss, and the ConsenSys Diligence best practices (opens in a new tab) catalog defensive patterns. In general terms, reviewers look for:
- Access control mistakes: functions that anyone can call when only an administrator should.
- Reentrancy: an external call that lets an attacker re-enter the contract before its state is updated.
- Input and arithmetic errors: unchecked values that produce unintended results.
- Oracle manipulation: relying on a price or data source that an attacker can influence.
- Unsafe external calls: assuming another contract behaves honestly.
- Key and admin risks: a single powerful key that, if stolen, can change everything.
Knowing the list does not prevent every flaw. It shapes the test plan and the review scope.
What an independent audit of smart contract development services tells you
An audit is a structured review of contract code and design by security reviewers who did not write it. It typically produces a report listing findings by severity, followed by fixes and a re-check.
It reduces risk but does not guarantee safety. A report covers a specific version of the code at a specific time, and any later change needs fresh review. Some projects add a public bug-reporting program after launch so outside researchers can disclose problems responsibly.
Upgrades, admin keys and gas efficiency
Immutable code is simple to reason about but cannot be fixed. Some teams therefore use a proxy design, in which users interact with a stable address that forwards calls to logic that can be replaced. That adds flexibility and also adds a powerful admin role and more complexity to review.
If you choose upgradeability, protect the upgrade key with multi-party approval, publish a delay before changes take effect, and document who holds authority. Efficient code also matters: every operation costs fees on a public network, so tidy storage use lowers cost for users and reduces computing work.
Industry use cases
- Trade and logistics: a contract releases payment when an authorized party records delivery confirmation.
- Insurance: a contract pays a defined amount when a trusted data source reports a qualifying event.
- Licensing: a contract splits revenue between rights holders in agreed proportions each time a payment arrives.
- Shared ownership: a contract tracks fractions of an asset and enforces transfer rules.
These are illustrative examples, not Kramate client results.
Regional considerations: USA, UK, Australia and Singapore
Whether code can bind parties, and whether an asset it handles is regulated, depends on the country and the facts. Confirm with legal counsel.
- USA: contract formation law varies by state, and financial regulators may take an interest in tokens and lending features.
- UK: see the FCA’s cryptoasset pages (opens in a new tab) for how it approaches firms and promotions.
- Australia: ASIC’s crypto-assets guidance (opens in a new tab) explains how existing law may apply.
- Singapore: payment token activity is regulated by the Monetary Authority of Singapore.
Where a contract is meant to carry legal weight, have counsel review the paired written terms, because code alone may not satisfy local contract rules.
Cost factors and how to plan a budget
- Complexity and number of contracts.
- Depth of testing, including attack simulation.
- Independent audit scope and any re-review after fixes.
- Upgrade and admin-key design.
- Deployment, monitoring and incident response.
- Documentation and handover.
Budget the audit as a core line, not an optional extra, and leave room for a second review round, because fixes often change code. Fixed-price suits a well-specified contract set, while a dedicated team suits a product with a long roadmap. Smart contract development services priced without an audit line deserve questions.
How to choose a smart contract development partner
- Ask for the written specification process and a sample test plan from any smart contract development company.
- Confirm separation: the team that builds should not be the team that audits.
- Check use of established libraries and an explanation of any custom logic.
- Discuss key management and upgrade authority openly.
- Get ownership in writing for source code, deployment keys and reports.
- Value candor: a partner who lists what they cannot guarantee is more reliable than one promising total safety.
How Kramate delivers smart contract projects
You have a dedicated project manager, daily Slack or Teams updates and a progress review at the end of each two-week round. We sign an NDA before detailed discussions, apply peer code review and least-privilege access in our own working practices, and transfer all intellectual property to you. The sequence is described in our approach to delivery. For the wider system around your contracts, see our blockchain development, IT security audit and API development services.
Frequently asked questions
How does a smart contract work?
It is code stored on a blockchain. When someone sends a transaction to it, network participants run the code and record the outcome. The result follows the written rules, with no company server in the middle.
What is a smart contract audit?
An independent security review of contract code and design that produces a findings report, followed by fixes and re-checks. It lowers risk, but it covers only one version of the code and cannot guarantee safety.
What are common smart contract vulnerabilities?
Frequent causes of loss include faulty access control, reentrancy, unchecked inputs, manipulable price feeds, unsafe calls to other contracts, and overpowered admin keys. The OWASP list is a practical starting point.
Can a smart contract be changed after deployment?
Normally not. Teams who need changes use a proxy pattern that forwards calls to replaceable logic. That adds flexibility but also adds an admin role that must be tightly protected.
What is a proxy contract?
A stable contract address that forwards user calls to a separate logic contract. Replacing the logic contract lets you fix bugs or add features while users keep the same address.
Is a smart contract legally binding?
Not automatically. Whether code has legal effect depends on local contract law and on whether parties also agreed written terms. Ask legal counsel in each country where you operate before relying on code alone.
Sources and further reading
- Solidity documentation (opens in a new tab)Solidity
- Ethereum developer documentation (opens in a new tab)ethereum.org
- Hyperledger Fabric documentation (opens in a new tab)Hyperledger Fabric
- OpenZeppelin Contracts documentation (opens in a new tab)OpenZeppelin
- OWASP Smart Contract Top 10 (opens in a new tab)OWASP
- Ethereum Smart Contract Security Best Practices (opens in a new tab)ConsenSys Diligence
- FCA Cryptoassets (opens in a new tab)UK FCA
- ASIC Crypto-assets (opens in a new tab)ASIC
FAQ
Frequently asked questions
Contract count and complexity are the main factors. Token logic, upgradability, integrations with other protocols and the chosen language, such as Solidity or Rust, all matter. Testing depth and audit preparation add effort, and independent audits are priced separately by auditors.
We usually move through specification, design, coding, testing, audit and deployment. Timeline depends on contract complexity, test coverage and audit availability. Because deployed contracts are hard to change, we avoid rushing the testing stage, and we agree the specification with you before any code is written.
You do. Kramate transfers the contract source, tests and documentation after payment, and signs an NDA first. Deployment and admin keys are set up under your control. Open-source libraries we use keep their licences, which we list.
Yes. We write contracts with clear interfaces, then connect them to your website, backend or mobile app, and to common wallets. We document each function so your developers can call the contract correctly and keep it maintained.
If a contract holds or moves value, an independent audit is strongly advisable. We write tests, review code ourselves and prepare documentation to make an audit smoother. Audits reduce risk but cannot remove it, and we explain what remains.
Solidity is used on Ethereum and compatible networks, while Rust is common on Solana and some other chains. The language follows the blockchain you choose, so pick the network first based on users, fees and tools. We advise on the trade-offs.
Standard contracts cannot be edited once live. Upgradable patterns exist but add complexity and trust assumptions. We discuss whether you need upgrades, who controls them and how to test thoroughly, as fixing live issues is difficult.
Write down the rules the contract must enforce, who the parties are, what assets are involved and what should happen in edge cases. A flow diagram helps. Clear specifications reduce changes, which are costly once coding and testing are done.
Taking new projects
Let’s talk about your Smart Contract Development Services needs
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- We reply within 4 business hours A real consultant reads your brief — no bot, no queue.
- 30-minute discovery call We dig into goals, constraints and budget. NDA signed on request.
- Proposal in 24 hours Scope, timeline, team and price — clear enough to decide on.
NDA on request You own the IP No obligation Free estimate