The companies below build custody wallets and integrate custody providers such as Fireblocks, BitGo or Anchorage into exchanges, banks and fintech apps. Digital asset custody involves far more than keeping cryptocurrency keys offline. Institutions also need transaction approvals, segregation of holdings, audit trails, and secure connections to trading and payment systems. Regulated safekeeping providers and technology firms address different parts of this process, while growing activity in stablecoins and tokenized assets is making that distinction more important.
1. Itexus
Itexus develops fintech software for businesses building digital asset products, including custodial and non-custodial cryptocurrency wallets. Its blockchain development work covers secure key management, multi-chain wallet functionality, exchange connections, and integration with existing financial platforms. In a published crypto trading project, Itexus integrated Fireblocks as the asset custody layer while building the surrounding trading application and internal accounting workflows.
That mix of wallet engineering and financial software integration is relevant to firms launching a customer-facing crypto service. Itexus supplies development and implementation rather than acting as the legal custodian of customer assets.
Key Facts
- Best for: Custom wallet and custody-connected fintech platforms
- Core services: Custody software development, crypto wallet development, custody provider integration
- Relevant experience: Coinstar digital wallet ecosystem; trading-platform integration with Fireblocks
- Delivery model: Custom product development and ongoing support
Contact Information
- Website: itexus.com
- Email: moc.suxeti@ofni
- LinkedIn: www.linkedin.com/company/itexus
- Facebook: www.facebook.com/itexus
- Twitter: x.com/ItexusSoft
- Instagram: www.instagram.com/itexus.soft
- Address: 8, The Green, STE road, Dover, DE 19901, United States
2. net-devs
net-devs builds enterprise software with a dedicated practice in financial technology. Its engineering work covers regulated, high-reliability systems, cloud architecture, backend development, modernization, and front-end applications. The company emphasizes automated testing, security, and audit requirements in fintech engagements.
For a digital asset business, this skill set matters when connecting custody infrastructure to account management, reporting, customer applications, and internal transaction processes. The role is software engineering around custody operations, with implementation and integration shaped by the financial institution's requirements.
Key Facts
- Best for: Fintech engineering and integration projects
- Core services: Enterprise development, cloud and platform engineering, fintech software, modernization
- Technologies: .NET, JVM, Node.js, Python, Go
- Location: Warsaw, Poland
Contact Information
- Website: net-devs.com
- Email: moc.sved-ten@tcatnoc
- LinkedIn: www.linkedin.com/company/net-devs
- Address: Obrzeżna 1D, 02-691 Warszawa, Poland
3. SoluLab
SoluLab develops cryptocurrency wallets and blockchain applications for organizations launching financial and Web3 products. Its wallet services cover custodial and non-custodial designs, MPC approaches, wallet APIs, and security-related functions around key handling and transactions.
SoluLab builds the software through which businesses provide custody-related functionality to customers. Its scope also includes financial application development, smart contracts, and blockchain integrations. That makes the firm relevant when wallets and asset management must operate within a branded financial app or larger enterprise platform.
Key Facts
- Best for: Custom wallet products and embedded custody functionality
- Core services: Crypto wallet development, MPC architecture, blockchain software
- Specialization: Web3 applications and wallet integrations
- Delivery model: Custom software and dedicated engineering teams
Contact Information
- Website: www.solulab.com
- Email: moc.balulos@selas
- Phone: +1 (424) 404 9371
- Address: 12200 W. Olympic Blvd. Ste. 140 Los Angeles, CA 90064
- LinkedIn: www.linkedin.com/company/solulab
- Instagram: www.instagram.com/solulabofficial
- Facebook: www.facebook.com/solulab.inc
- Twitter: x.com/solulab
4. LeewayHertz
LeewayHertz develops enterprise blockchain systems, decentralized applications, and custom software for complex technology environments. Its product work includes cryptocurrency wallets and blockchain networks, alongside applications that connect distributed ledger functionality with established business services.
For custody projects, LeewayHertz provides engineering capabilities for wallets, asset interfaces, transaction records, and supporting enterprise software. The company has worked on blockchain verification and financial-data applications as well. Its broader integration practice is relevant to custody initiatives that must operate alongside corporate systems instead of functioning as isolated crypto wallets.
Key Facts
- Best for: Enterprise blockchain projects with wallet integration
- Core services: Blockchain development, decentralized applications, software engineering
- Specialization: Business-system and blockchain integration
- Related experience: Web3 wallet and blockchain verification projects
Contact Information
- Website: www.leewayhertz.com
- Email: moc.ztrehyaweel@selas
- Address: 5th Floor, Tower C, Unitech Cyber Park Sector 39, Gurugram Haryana 122001
- LinkedIn: www.linkedin.com/company/leewayhertz-technologies
- Facebook: www.facebook.com/LeewayHertz
- Twitter: x.com/LeewayHertz
5. SoftPro
SoftPro develops custom web applications, cloud systems, and enterprise software. Its Warsaw-based team works with .NET, ASP.NET Core, React, and Microsoft Azure, with services spanning full-stack delivery, migration, and ongoing support. The company's public fintech-focused materials also address secure integrations and financial application engineering.
Digital asset operators often need client portals, account dashboards, transaction databases, and operational applications around an existing custody provider. SoftPro's development and cloud capabilities fit that supporting software layer, where the project depends on secure integrations and maintainable business systems.
Key Facts
- Best for: Custom web and cloud applications supporting financial operations
- Core services: Software development, web applications, cloud development, maintenance
- Technologies: .NET, React, Azure, Node.js
- Location: Warsaw, Poland
Contact Information
- Website: soft-pro.pl
- Address: Poland, Warsaw, Mazowieckie Voivodeship, 13 Erasmus Ciołka St. 401
6. A-listware
A-listware offers software engineering and dedicated development teams for financial services, including cryptocurrency projects. Its published service scope includes blockchain networks, security token issuance, DeFi platforms, crypto wallets, smart contracts, and application integration. The company also provides security, QA, and infrastructure support for software products.
These capabilities serve businesses developing the technology stack around asset safekeeping, such as customer wallets, administrative portals, approval processes, and blockchain connections. A-listware's model is based on delivering developers and product engineering rather than holding clients' tokens as a regulated custodian.
Key Facts
- Best for: Additional engineering capacity for crypto and fintech products
- Core services: Blockchain development, crypto wallets, custom software, QA
- Delivery model: Dedicated teams and IT outsourcing
- Industries: Finance, banking, investment and cryptocurrency
Contact Information
- Website: a-listware.com
- Email: moc.erawtsil-a@ofni
- Facebook: www.facebook.com/alistware
- LinkedIn: www.linkedin.com/company/a-listware
- Address: St. Leonards-On-Sea, TN37 7TA, UK
- Phone: +44 (0)142 439 01 40
7. PixelPlex
PixelPlex builds blockchain financial products, including cryptocurrency wallets and related digital asset infrastructure. Its wallet development services address self-custody, delegated custody, transaction ledgers, administration tools, and integrations with blockchain networks or external providers.
The company's work centers on applications and workflows through which businesses manage digital assets under a chosen operating model. PixelPlex also develops tokenization systems, decentralized finance software, and smart contracts. Its combination of wallet engineering and broader financial blockchain development suits products where custody functionality must be connected to investing, trading, or token issuance.
Key Facts
- Best for: Custom wallet and digital asset platform development
- Core services: Wallet applications, blockchain development, smart contracts, integrations
- Specialization: Custodial and self-custodial wallet architecture
- Related work: Tokenization and decentralized finance software
Contact Information
- Website: pixelplex.io
- Email: oi.xelplexip@ofni
- Phone: +1 646 490 0772
- Address: West 28th St. Suite 31 USA
- LinkedIn: www.linkedin.com/company/pixelplex-inc
- Facebook: www.facebook.com/pixelplex.inc
- Twitter: x.com/pixelplexinc
8. Antier Solutions
Antier develops blockchain wallet and custody infrastructure for businesses entering digital asset markets. Its wallet-as-a-service product covers MPC, multisignature designs, white-label deployment, and API or SDK integration. Its crypto banking offering also connects wallets with transaction processes and operational controls.
Businesses building a custody-enabled product need to decide who controls private keys, how transfers are approved, and how access is managed. Antier's engineering services cover these decisions alongside blockchain application development. Its offering is relevant to exchanges, fintech providers, and enterprises requiring digital asset features within their own interfaces.
Key Facts
- Best for: White-label wallet services and enterprise custody architecture
- Core services: Wallet-as-a-service, MPC and multisig wallets, blockchain development
- Specialization: Digital asset infrastructure and crypto banking systems
- Integration options: APIs and SDKs
Contact Information
- Website: www.antier.com
- Email: moc.reitna@tcatnoc
- Phone: +91 89686 17335
- Address: C-208, Phase 8B Industrial Area, Mohali, Punjab INDIA, 160059
- LinkedIn: www.linkedin.com/company/antierofficial
- Instagram: www.instagram.com/antier\_official
- Facebook: www.facebook.com/antierofficial
- Twitter: x.com/antier\_official
9. Blockchain App Factory
Blockchain App Factory develops cryptocurrency wallets, blockchain applications, and digital asset platforms. Its wallet development services include custodial and non-custodial designs, transaction handling, and technology that enables users or platform operators to manage assets across supported networks.
Its wider Web3 work covers crypto exchanges, token development, and applications connecting wallets to trading and tokenized asset activity. For buyers seeking a branded custody-enabled product, these capabilities support both wallet functionality and related platform features. The focus is on developing and deploying software, not operating an institutional custodial account.
Key Facts
- Best for: Branded crypto wallets and exchange-related custody software
- Core services: Crypto wallet development, blockchain platforms, exchange software
- Specialization: Custom and white-label Web3 products
- Related capabilities: Smart contracts and token platforms
Contact Information
- Website: www.blockchainappfactory.com
- Email: moc.yrotcafppaniahckcolb@ofni
- Phone: +91 63692 50989
- Address: 60 Robinson Rd, Singapore 68892
- LinkedIn: www.linkedin.com/company/blockchainappfactory
- Instagram: www.instagram.com/blockchainappfactory
- Facebook: www.facebook.com/BlockchainAppFactory
- Twitter: x.com/Blockchain\_BAF
10. Innowise
Innowise develops enterprise blockchain and financial software, including wallets and custody-related systems. Its blockchain engineering services cover institutional wallet architecture, access permissions, multisignature controls, and connections to digital asset platforms.
The company also develops transaction processing, financial applications, and system integrations. This makes it a relevant engineering partner for banks and fintech businesses adding digital asset capabilities to established products.
Key Facts
- Best for: Custom custody integration within financial systems
- Core services: Blockchain engineering, wallet solutions, financial software development
- Specialization: Institutional wallets and third-party platform integration
- Related capabilities: System integration, cybersecurity, dedicated engineering teams
Contact Information
- Website: innowise.com
- Email: moc.esiwonni@tcatnoc
- Phone: +48 (787) 027 706
- Address: Rondo Daszyńskiego 2B, The Warsaw HUB B
- LinkedIn: www.linkedin.com/company/innowise-group
- Twitter: x.com/innowisegroup
11. Intellectsoft
Intellectsoft develops enterprise software and financial applications, including blockchain-enabled systems and digital wallets. Its project portfolio includes cryptocurrency wallet applications, while its broader services cover mobile development, system integration, and technology modernization.
The company's role in custody-related projects centers on building applications through which people access, transfer, and manage digital assets. Financial organizations can also draw on its integration experience when adding wallet capabilities to established platforms. Intellectsoft is an engineering partner for custody-related products rather than a specialist institution that holds client assets.
Key Facts
- Best for: Enterprise applications incorporating crypto wallets
- Core services: Mobile and web development, blockchain applications, system integration
- Specialization: Enterprise software and fintech product engineering
- Related experience: Cryptocurrency wallet applications
Contact Information
- Website: www.intellectsoft.net
- Email: ten.tfostcelletni@ofni
- Phone: +1 (650) 233-6196
- Address: 500 Fashion Ave Fl 8A New York City NY 10018, USA
- LinkedIn: www.linkedin.com/company/intellectsoft
- Facebook: www.facebook.com/Intellectsoft
- Twitter: x.com/Intellectsoft
12. 4IRE
4IRE develops financial software and blockchain products, including cryptocurrency wallets, decentralized applications, and systems for tokenized assets. Its wallet development offering covers custody-related infrastructure and multisignature treasury functionality for organizations handling digital assets.
The company combines software engineering with blockchain development and financial product design. This supports projects where custody functions are embedded in a larger financial application or tokenization platform. Its fintech-oriented engineering scope also extends to transaction processing, account management interfaces, and integrations that surround wallet-based services.
Key Facts
- Best for: Fintech software with embedded digital asset custody features
- Core services: Wallet development, blockchain engineering, fintech applications
- Specialization: Custody-related wallet architecture and tokenization
- Related capabilities: Smart contracts and decentralized finance software
Contact Information
- Website: 4irelabs.com
- Email: moc.sbaleri4@ph
- Phone: +351 966 223 759
- Address: Hovslagargatan 5, 111 48, Stockholm
- LinkedIn: www.linkedin.com/company/4ire
- Instagram: www.instagram.com/4irelabs
- Twitter: x.com/4irelabs
13. 21Century Tech
21Century Tech operates as an AI-native software studio delivering production applications through senior-led engineering teams. Its work includes product architecture, full-stack features, third-party integrations, code review, testing, and deployment. Human engineers retain design and security decisions while AI-assisted development supports implementation tasks.
Custody platforms rely on dependable application layers for onboarding, account interfaces, transaction records, and integration with external services. The company's full-stack engineering model fits projects that require those components to be built or modernized, especially when a team needs additional implementation capacity.
Key Facts
- Best for: Custom software and integration development
- Core services: Product engineering, full-stack development, testing, modernization
- Delivery approach: Senior-led, AI-assisted software development
- Location: Miami and remote-first operations
Contact Information
- Website: 21century.tech
- Email: hcet.yrutnec12@tcatnoc
14. OSKI Solutions
OSKI Solutions designs, builds, and maintains custom software, including fintech applications. Its service mix covers web and mobile development, cloud and DevOps, system modernization, cybersecurity and compliance work, and software testing. It also supports dedicated development teams for organizations extending their engineering capacity.
Digital asset businesses often need secure internal platforms and customer-facing applications that work with custody APIs, payments, and reporting services. OSKI's engineering and integration offering is relevant to those supporting workflows, particularly when a financial platform needs to be modernized or scaled.
Key Facts
- Best for: Custom fintech applications and systems integration
- Core services: Software development, cloud and DevOps, cybersecurity, QA
- Capabilities: Web applications, mobile development, system modernization
- Delivery model: End-to-end projects and dedicated teams
Contact Information
- Website: oski.site
- Email: etis.ikso@tcatnoc
- LinkedIn: www.linkedin.com/company/oski-solutions
15. Peiko
Peiko designs and develops blockchain platforms, cryptocurrency wallets, and exchange systems. Its blockchain services expressly include wallets and custody platforms, covering custodial and non-custodial approaches, transaction workflows, asset management features, and multichain integrations.
Custody software often needs separate user interfaces for administrators and customers. Peiko develops the surrounding components, including exchanges, payment integrations, smart contracts, and administrative tools. Its engineering services are relevant to startups creating wallet products or incorporating digital asset management into an existing application.
Key Facts
- Best for: New crypto wallet and custody software products
- Core services: Blockchain platforms, custodial and non-custodial wallets, exchanges
- Specialization: Custom Web3 product development
- Related capabilities: Smart contracts, multichain integration, payment gateways
Contact Information
- Website: peiko.space
- Email: ecaps.okiep@olleh
- Phone: +1 (650) 278-4458
- LinkedIn: www.linkedin.com/company/peiko
- Twitter: x.com/peiko\_space
Conclusion
Custody procurement increasingly involves a choice between an independent regulated safekeeping institution and technology used to operate wallets under an institution's own controls. The legal entity holding assets, the ownership of signing keys, and the division of transaction approvals all affect operational responsibility. Buyers should also examine segregation, recovery procedures, supported blockchains, incident response, and how assets move to exchanges or payment networks. Stablecoins and tokenized securities add further demands for reconciliation, settlement, and governance. The most useful custody architecture is one whose security model and regulatory structure match the way the business actually operates.