P2P crypto trading platform
BlocksMaples
A P2P marketplace for emerging tokens, settled in USDT on BNB Smart Chain, with escrow and KYC. We built the API, the web app, the iOS/Android app and the admin back office.
Techmax Labs · Founder-led engineering team · Kolkata, working worldwide
Engineering you can check.
We're a founder-led team in Kolkata building AI agents, blockchain systems, backends and mobile apps for clients worldwide. Every number here names its source.
Talk to an engineer, not a salesperson.
Example flow: AI agentYour APIChainYour appAn AI agent pays for an API call
Example flowAn AI agent asks your API for a report.
GET /v1/reports/q3
- Your API, Backends and APIs: how we build this part
The API charges.
Your API asks it to pay first: 0.05 USDC.
402 Payment Required·PAYMENT-REQUIRED(price, asset, network, payTo)The agent signs the payment itself. No human clicks.Retry
GET /v1/reports/q3withPAYMENT-SIGNATURE
- Chain, Blockchain and dApps: how we build this part
The chain settles.
The payment settles on-chain.Facilitator
/verify→/settle→ tx0x7c1e…a93f
- Your app, Mobile apps: how we build this part
The app shows it.
Your app shows the paid report, with a receipt.
200 OK·PAYMENT-RESPONSE(tx hash)
Example flow. Endpoints, amounts and transaction hashes are illustrative.
What is x402?
An HTTP-native payment flow: a service answers with 402 Payment Required and its terms, and the caller pays and retries with proof of payment. It lets an agent pay per call instead of holding an account.
Show the engineer view
GET /v1/reports/q3402 Payment Required·PAYMENT-REQUIRED(price, asset, network, payTo)- Retry
GET /v1/reports/q3withPAYMENT-SIGNATURE - Facilitator
/verify→/settle→ tx0x7c1e…a93f 200 OK·PAYMENT-RESPONSE(tx hash)
Reviews
In our clients' words
From client projects our founder, Anupam, delivered.
Reviews are verbatim from client contracts delivered through Upwork. '…' marks where a quote was shortened. Client names stay private.
“Excellent developer. Anupam delivered a complex production integration with strong attention to architecture, safety, testing, and rollback procedures. He followed the scope carefully, communicated clearly, and provided a reusable solution…”
Skills endorsed:
“Anupam did an excellent job! Everything was completed exactly as agreed in the contract, with great attention to detail and professionalism. I truly appreciate the hard work and commitment…”
“Excellent freelancer. The work was completed professionally and showed strong understanding of modern web application design, SaaS-style presentation, user experience, and secure system interface requirements…”
Selected work
Live products we built, and the evidence for each
Three client products in production today, each named with its client's permission. The captures are the live sites as their owners publish them.
One engine · two live products
Bondkoin Labs and Voltara run on the same reward engine we built: one codebase, two branded products.
How one engine runs bothCaptured from the live sites on 26 Sep 2026. The words on these pages, “mining” among them, are the clients' own, not ours.
Reward platform on BNB Chain
Bondkoin Labs
A daily reward platform: one tap opens a 24-hour reward window, and verified users convert their points into $BONDKOIN, a BEP-20 token paid out on BNB Chain.
55,000+ monthly active users
Client figure from the Bondkoin Labs admin dashboard, Sep 2026
Reward game on BNB Chain
Voltara
The same engine with a game on top: users build a six-slot rig, balance simulated heat and power, and convert points into $VLTR, a BEP-20 token paid out on BNB Chain.
What we build
AI agents & automation
Agents and LLM workflows that do real work, inside limits you set.Blockchain & dApps
Smart contracts and the apps around them: marketplaces, OTC desks, voting, tokens.Solana & trading systems
On-chain programs and execution paths designed for a congested network.Custom Layer-1 networks
Validators, staking and the tooling a network needs to run.Backends & APIs
APIs, queues and data layers designed for the load you'll actually have.Mobile apps
iOS and Android apps with the backend and wallet flows behind them.
Recent engagements
Build log
Recent client engagements, newest first. Client names withheld.
| When | Project type | Engagement | Rating |
|---|---|---|---|
| Sep 2026 | Solana trading-system integration | Hourly · 17 h | 5.0 out of 5 stars |
| Sep 2026 | AI video generation | Hourly · 10 h | 5.0 out of 5 stars |
| Jul–Sep 2026 | Website and blockchain build | Fixed price | 5.0 out of 5 stars |
| Jun–Sep 2026 | Blockchain arbitrage bot | Hourly · 71 h | No feedback given |
| Jun–Aug 2026 | Solana DEX bot | Hourly · 62 h | No feedback given |
| Jun–Jul 2026 | IoT energy monitoring with blockchain (Raspberry Pi) | Fixed price | 5.0 out of 5 stars |
| Jun–Jul 2026 | Web-based blockchain OTC platform | Fixed price | 5.0 out of 5 stars |
| Jun 2026 | Blockchain voting and SaaS pricing design | Fixed price | 5.0 out of 5 stars |
| May 2026 | Election feature for an existing web app | Fixed price | 5.0 out of 5 stars |
| Oct 2025–May 2026 | Blockchain developer, long-term | Hourly · 106 h | No feedback given |
10 of 19 engagements shown.
Source: client contracts delivered through Upwork · checked 24 Sep 2026
How a project runs
Bring us the problem, not the spec.
Every step ends with something you can read and keep.
How we work, pricing and termsDiscover
You get Written brief
Architect
You get Architecture doc, key decisions (ADRs), milestone plan with estimates
Build
You get Regular demos and written updates
Validate and hand over
You get UAT sign-off and handover notes
The team
Who you'll work with
Real names, and a source for every number.
Meet the teamAnupam Bera
Founder & Lead Engineer
Founder's certifications
- Hedera Developer (The Hashgraph Association, 2026)
- Multi AI Agent Systems with CrewAI (DeepLearning.AI, 2023)
- Rust (HackerRank, 2022)
Try it first
Not ready to talk? Start here.
Free, and no email needed to see your result.
Scope your project
9 short steps. See your result before you share an email.
Project assistant (guided)
Answer guided questions. Get a technical brief an engineer reads.
Run a free engineering check
Architecture health · Scale planner · Web3 readiness
Three ways to start
Pick whichever suits you. A person reads every message.
On a 30-min call we cover:
- Your problem and who it's for.
- Constraints: stack, chain, timeline, budget.
- A first architecture sketch.
- Next steps, written up after the call.
What you won't find here: client names we don't have permission to use, numbers we can't source, audits we haven't had, or people who don't work here. Every number on this site says where it comes from.