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HASHXLABS
TOKEN2049Meet us in Singapore · 7–10 Oct

Blockchain engineering & smart contract audits

We build and secure the smart contracts that hold your users’ money.

DeFi protocols, tokenized assets, stablecoins and custody, designed from a written spec and broken by invariant fuzzing before anyone else can.

Book a 30-min technical callSee our work
Ethereum mainnetReading the latest block

Live from Ethereum mainnetMainnet feed paused, retrying

  • 01Findings delivered as failing tests
  • 02Your code, tests and docs from day one
  • 03Senior engineers, first call to mainnet

Building on

  • Ethereum
  • Solana
  • Polygon
  • Arbitrum
  • Base
  • Optimism
  • Avalanche
  • BNB Chain
Marina Bay Sands, Singapore, where TOKEN2049 takes place

TOKEN2049Singapore · 7–8 October · Marina Bay Sands

Meet us in Singapore, 7–10 October

We are at TOKEN2049 and around the city all week. Book 30 minutes with an engineer: bring your contracts, your token design or the agent you want to trust.

Book a meeting See our TOKEN2049 week
TOKEN2049 · 7–8 October 2026Video calls if you are not in townTOKEN2049 Singapore 2026 guide
Services

Everything you need to ship on-chain and with AI

From the first contract to production operations, one team designs, builds and secures it.

All services

Blockchain development

Smart contracts, dApps and protocol infrastructure on EVM chains and Solana.

Smart contracts & dApps · Layer 2s & appchains · Wallets & account abstraction

Learn more

Smart contract security

Review, invariant fuzzing and testing, with every finding delivered as a failing test.

Manual code review · Invariant & fuzz testing · Pre-audit hardening

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RWA tokenization

Permissioned tokens for funds, credit and real estate, with compliance enforced on-chain.

ERC-3643 security tokens · Investor onboarding & KYC · Distributions & reporting

Learn more

DeFi & exchanges

Lending markets, vaults, DEXs and exchange infrastructure designed for adversarial markets.

Lending, vaults & staking · DEX & order-book engines · Custody & settlement

Learn more

Stablecoins & payments

Issuance, reserves and payment rails that reconcile with the systems your finance team runs.

Stablecoin issuance · Payment gateways & ramps · Treasury & payouts

Learn more

AI development

Retrieval systems and AI agents connected to your tools, with a person approving every write.

AI agents & automation · RAG over your documents · Evaluation & monitoring

Learn more

Explore the full range of blockchain, security and AI services we build and run.

View all services
Who we work with

Built for teams where the money is real

Founders, fintechs, issuers and enterprises come to us when a mistake would be expensive.

Launch DeFi protocols, tokens and dApps with security designed in from the first commit.

  • Protocol & token design
  • Audit-ready contracts
  • Mainnet launch & monitoring
Blockchain development

Stablecoin rails, custody and crypto payments that reconcile with your existing books.

  • Stablecoin issuance & rails
  • Custody & wallets
  • Reconciliation with your ledger
Stablecoins & payments

Tokenize funds, credit and property with investor eligibility enforced in the token itself.

  • ERC-3643 permissioned tokens
  • Investor onboarding & KYC
  • Distributions & reporting
RWA tokenization

Blockchain integration and AI agents connected to the systems your teams already use.

  • Chain integration
  • AI agents with approvals
  • Retrieval over your documents
AI development
See solutions by use case
Why HashX Labs

Engineering you can trust with value

How we think

Most exploits are ordinary mistakes: , , . We make each of them fail a test long before it can fail on mainnet.

Illustrative example: each mistake made to fail a test, then fixed.

Example: withdraw() sends ETH before clearing the balance, so a reentrancy test withdraws twice the deposit. Moving the balance update above the external call makes the test pass.

  1. 01

    Senior engineers, start to finish

    The engineers who scope your project are the ones who design and build it. Nothing gets lost in a hand-off.

  2. 02

    Security from the first commit

    Written specs, invariant tests and fuzzing are part of the build, not a step bolted on before launch.

  3. 03

    Clear scope, no surprises

    A written scope with assumptions spelled out, milestones you can see, and a demo at every step.

  4. 04

    You own everything

    Code, tests, documentation and runbooks live in your repository from day one.

How we work

Five blocks from idea to mainnet

The same five steps on every project. Each one ends with something you can read, run or approve.

  1. Block 01

    Discover

    We learn the product, the users and what must never go wrong, then write it down as a specification.

    You get
    • Written specification
    • Invariants: what must never happen
    • Open questions answered
  2. Block 02

    Design

    Architecture, threat model and a scoped plan with milestones, reviewed with you before code.

    You get
    • Architecture diagram
    • Threat model with mitigations
    • Milestone plan you approve
  3. Block 03

    Build

    Small, readable components with tests in every pull request and a demo at each milestone.

    You get
    • Pull requests with tests
    • A demo at every milestone
    • Code your team can read
  4. Block 04

    Test & review

    Invariant fuzzing, static analysis, fork tests and manual review. Findings arrive as tests you can run.

    You get
    • Fuzzing and static analysis
    • Findings as runnable tests
    • Fixes with regression tests
  5. Block 05

    Launch & support

    Deployment scripts, key ceremonies, monitoring and a runbook. We stay on after launch.

    You get
    • Deploy scripts and key ceremony
    • Monitoring and alerts
    • A runbook and support after launch
Live projects

Shipped, live, and one click away

Two client sites we built, running in production today. Scroll through them here, then open the real thing.

01Web3 · Creator economy

SinghCoin

A home for a creator token and its ecosystem

SinghCoin connects social content, digital collectibles, events and token rewards. The site explains the ecosystem, introduces its new app, SlaySpace, and puts the SINGH token's on-chain details one click from BscScan.

What we built
  • Kinetic hero and motion system, hand-coded without a framework
  • Ecosystem pages for social, collectibles and events
  • Token section with the BEP-20 contract and a BscScan link
Token
SINGH
Standard
BEP-20
Visit singhcoin.io
  • HTML & CSS
  • Vanilla JS
  • Cloudflare
  • BNB Chain
The SinghCoin website on desktop: a full-page screenshot of singhcoin.io.

Real screenshots of the live site, captured October 2026.

02Software consultancy · Germany

BitNautics

A corporate site for a German software consultancy

BitNautics builds custom software, websites and automotive embedded systems from Rosbach, Germany. Their site presents three service lines, the team and open roles, and turns visitors into quote requests.

What we built
  • Responsive company website, designed and built end to end
  • Service pages for web, automotive and custom software
  • Careers, blog and quote-request flows
Based in
Rosbach, Germany
Services
Web · Automotive · Software
Platform
WordPress + Elementor
Visit bitnautics.com
  • WordPress
  • Elementor
  • Responsive
  • SEO
The BitNautics website on desktop: a full-page screenshot of bitnautics.com.

Real screenshots of the live site, captured October 2026.

Selected work

Systems we have built

Client names stay private under NDA. The engineering is described as it was built.

View all work
01DeFi protocolUnder NDA

Cross-chain AMM with staking and yield routing

A constant-product AMM with a staking module and cross-chain message passing, with invariant tests over every flow.

  1. User
  2. AMM pool
  3. Staking vault
  4. Router
SolidityFoundryLayerZeroSlither
Read the case study

Illustrative interface, not a client screenshot.

Illustrative interface for a cross-chain AMM: a token swap card, a liquidity pool chart, a staking vault and a bridge between two chains.

Illustrative interface, not a client screenshot.

02Asset managerUnder NDA

Permissioned real-world asset tokenization portal

Identity-gated transfers with on-chain compliance checks, a claims registry and automated holder distributions.

  1. Investor
  2. Claims
  3. Compliance
  4. Token
SolidityERC-3643PolygonChainlink
Read the case study

Illustrative interface, not a client screenshot.

Illustrative issuer console for a permissioned asset token: an investor registry with verification status, compliance rules, a distribution chart and the issuance flow from investor to token.

Illustrative interface, not a client screenshot.

03Fintech startupUnder NDA

Multi-signature custody wallet with a policy engine

Threshold-signature vaults with per-transaction spend policies and hardware-backed keys, on web and mobile.

  1. Client
  2. Policy
  3. Signer
  4. KMS
React NativeNode.jsPostgreSQLAWS KMS
Read the case study

Illustrative interface, not a client screenshot.

Illustrative custody console: a treasury vault, a pending transfer with two of three approvals, a policy engine and the signing path from client to key service.

Illustrative interface, not a client screenshot.

04Logistics operatorUnder NDA

Retrieval-augmented agent over internal documents

Hybrid retrieval over a chunked corpus, with a tool-calling agent and a human approving every write.

  1. Question
  2. Retriever
  3. Agent
  4. Approval
PythonpgvectorFastAPILangChain
Read the case study

Illustrative interface, not a client screenshot.

Illustrative assistant interface: a chat answer with source citations, the retrieved documents, an approval queue for an ERP update and the pipeline from question to approval.

Illustrative interface, not a client screenshot.

Technology

Proven tools, chosen for the job

We pick the stack that fits your product and your team, and explain why in writing.

016 tools

Smart contracts

Solidity or Vyper on EVM chains, Rust with Anchor on Solana. Foundry runs the tests and scripts; Hardhat where your repo already uses it.

  • Solidity
  • Rust
  • Anchor
  • Vyper
  • Foundry
  • Hardhat
025 tools

Security

Static analysis, fuzzing, invariant suites and fork tests run first, so the line-by-line review is spent on logic rather than typos.

  • Slither
  • Echidna
  • Foundry invariants
  • Fork testing
  • Manual review
How it fits togetherA typical build, simplified
Slither · Echidna · invariants · fork testsWeb & mobile appsNext.js · React NativeServices & dataNode.js · PostgreSQLAI & retrievalPython · pgvectorSmart contractsSolidity · Rust / AnchorChains & oraclesEVM · Solana · Chainlink
045 tools

AI

Python services around hosted or open models, with retrieval in the Postgres you already run.

  • Python
  • FastAPI
  • LangChain
  • pgvector
  • LLM APIs & open models
056 tools

Apps & cloud

TypeScript from end to end: web, mobile and APIs on one typed codebase, running on AWS.

  • TypeScript
  • Next.js
  • React Native
  • Node.js
  • PostgreSQL
  • AWS
036 tools

Chains & protocols

Ethereum, its L2s and Solana, with proven standards and infrastructure in place of home-made versions.

  • EVM chains
  • Solana
  • LayerZero
  • Chainlink
  • ERC-4337
  • ERC-3643
Ways to work with us

Start small or go end to end

Every engagement begins with a short conversation and a written scope.

  1. Best for you have an idea, not yet a spec

    Discovery & specification

    A short engagement to turn an idea into a buildable plan.

    • Requirements & architecture
    • Threat model
    • Scoped estimate with assumptions
  2. Best for you want the whole product built

    Product build

    End-to-end delivery against an agreed scope and milestones.

    • Contracts, backend & apps
    • Weekly demos
    • Tests and docs in your repo
  3. Best for your contracts are already written

    Security review

    Independent review of contracts you have already written.

    • Manual review & fuzzing
    • Findings as failing tests
    • Fix verification
  4. Best for you are live and want to keep shipping

    Ongoing engineering

    Continued development, upgrades and support after launch.

    • Feature development
    • Upgrades & migrations
    • Monitoring & incident help
FAQ

Questions we hear often

Can't find your answer? Ask us directly.

Contact us

Blockchain products that hold real value (DeFi, tokenization, stablecoins, wallets, exchanges) and AI systems that connect to real business tools. We also review and harden contracts other teams have written.

Senior engineers throughout. The people who scope your project design and build it, so nothing is lost between the first call and the code.

EVM chains (Ethereum and its L2s, Polygon, BNB Chain, Avalanche) and Solana. If your idea fits a different chain better, we will say so before you spend money.

After a short discovery and a written scope. You get a range with the assumptions spelled out, not a number on a first call.

It depends on scope. Discovery gives you a written plan with milestones; a focused contract system takes weeks, a full platform takes months.

We review and test contracts thoroughly, ours and yours. For a launch that will hold significant value we still recommend an independent audit on top; our work makes it shorter and cheaper.

You do. Code, tests and documentation live in your repository from the start.

Client names stay private under NDA. We share architectures and can walk through code structure and test approach on a call.

Have a project in mind?

Tell us what you are building and what must not go wrong. An engineer who would work on it will reply.

Start a project info@hashxlabs.com