Below is a curated list of reputable blockchain development companies across Asia (multi-country coverage), with a short but detailed review of each: what they do, strengths, weaknesses/risks, typical clients or projects, and sources you can check for more detail. I selected vendors with demonstrable enterprise work, public case studies/awards, and third‑party reviews/certifications. If you’d like, I can turn any of these into a short RFP template or a direct shortlist for outreach.

1. ChainUp (headquartered in Singapore) — enterprise exchange / custody / B2B blockchain platform provider

• What they do: White‑label and custom crypto exchange platforms, custody & wallet solutions (MPC / custodial services), KYT/AML tooling, NFT stacks and Web3 infrastructure for institutions.
• Strengths: Large B2B focus (many exchange deployments), multiple security & compliance certifications (SOC 2, ISO27001 family), global client base and explicit enterprise positioning.
• Typical clients/projects: crypto exchanges, institutional custody & wallet deployments; marketing materials cite hundreds of institutional clients and large end‑user counts.
• Risks / caveats: Large platform vendors are often higher cost and oriented to exchange/custody use cases rather than small custom dApp work — confirm whether you need full platform vs. bespoke product development.
• Indicative pricing / scale: enterprise pricing (project scope varies widely).
• Sources: ChainUp corporate pages and press. (chainuppl.com, m.chainup.com)

2. HashCash Consultants (India; global operations) — remittances, exchange platforms, enterprise blockchain

• What they do: End‑to‑end blockchain products (cross‑border remittances, white‑label exchanges, corporate payment rails) plus custom blockchain apps.
• Strengths: Long track record in exchange/remittance solutions and a portfolio of ready products (reduces build time), multiple client testimonials and Clutch/GoodFirms presence.
• Risks / caveats: Mixed employee reviews on employer review sites (useful to know for long engagements), and productized platforms may need customization for strong regulatory requirements.
• Typical clients/projects: banks, currency exchanges, payment platforms and some governments/large corporates.
• Sources: HashCash product pages and third‑party reviews. (hashcashcc.com, clutch.co)

3. LeewayHertz (India / US) — custom Web3 & blockchain applications for enterprise & startups

• What they do: Full‑stack blockchain engineering (Ethereum, Hyperledger, Corda, EOS, Stellar, Tron), tokenomics, smart contracts, dApps, supply‑chain and healthcare proofs of concept.
• Strengths: Strong engineering-oriented shop with deep custom dev & case studies (supply chain, pharma traceability, etc.), well rated on Clutch and GoodFirms for quality.
• Risks / caveats: Occasional mixed online reviews about specific projects — as with many consultancies, outcomes depend on scoping and PM. Verify specific platform/stack expertise when