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Web3 / Blockchain Integrations

A small but distinct subset of the portfolio is on-chain. These apps live alongside but separate from the main fiat-payment / SaaS apps; they don't share the unified payment-gateway service.

Portfolio map

App Chain(s) Stack
akt-giving-garden-main Ethereum / EVM wagmi + RainbowKit + Hardhat + The Graph + ethers.js + WalletConnect v2 + Coinbase Wallet SDK + MetaMask SDK + OpenZeppelin
chat-governance-hub-main EVM wagmi + RainbowKit + OpenZeppelin Governor v4
my-onchainkit-app Base (Coinbase L2) wagmi + Coinbase OnChainKit
tiny-governance-hub-base44-main EVM wagmi + RainbowKit
PolyMarketAI Polygon Polymarket CLOB API (off-chain matching, on-chain settlement)

wagmi

What it is. React hooks for Ethereum. useAccount, useConnect, useSignMessage, useReadContract, useWriteContract. The de-facto frontend layer for any EVM dApp in 2025–2026.

Used in: akt-giving-garden, chat-governance-hub, my-onchainkit-app, tiny-governance-hub.

viem

What it is. Modern, TypeScript-first Ethereum library. Replaces ethers.js for new code. wagmi is built on viem internally.

Used in: all of the wagmi apps (transitive dependency).

ethers.js

What it is. The original "ethers" Ethereum library — Wallet, Contract, Provider classes.

Used in: akt-giving-garden (kept for legacy contract code). New code in the portfolio uses viem.

RainbowKit

What it is. Pre-built wallet-connection UI for wagmi. Drops in a "Connect Wallet" button that supports MetaMask, WalletConnect, Coinbase Wallet, Rainbow, and dozens more.

Used in: akt-giving-garden, chat-governance-hub, tiny-governance-hub.

Coinbase OnChainKit

What it is. Coinbase's React component library specifically for Base (their L2). Pre-built <Wallet />, <Transaction />, <Identity /> components, smart-wallet support out of the box.

Used in: my-onchainkit-app — built on top of Base specifically.

Hardhat

What it is. Ethereum dev environment — local node, contract compile, test runner, deploy scripts, gas reporter.

Used in: akt-giving-garden (smart-contract development).

Tradeoffs / alternatives. Foundry is the current ascendant alternative (Solidity-based tests, faster). akt-giving-garden uses Hardhat; new portfolio Web3 apps could go either way.

The Graph

What it is. Indexing protocol for blockchain data. Subgraphs are GraphQL APIs that return on-chain events / state in a queryable form.

Used in: akt-giving-garden — historical on-chain data for the giving-garden contracts.

OpenZeppelin Contracts

What it is. Audited reference implementations of common smart-contract patterns: ERC-20, ERC-721, ERC-1155, AccessControl, Governor, ReentrancyGuard, Pausable.

Used in: - akt-giving-garden — OpenZeppelin contracts (general). - chat-governance-hub — OpenZeppelin v4 Governor (on-chain DAO governance).

Why we use it. Don't roll your own ERC-anything. Bugs in audited code are extremely rare; bugs in custom code are extremely common.

Wallet connectivity

SDK Apps
WalletConnect v2 akt-giving-garden
Coinbase Wallet SDK akt-giving-garden, my-onchainkit-app
MetaMask SDK akt-giving-garden

RainbowKit and OnChainKit abstract these — the SDKs are also used directly when finer control is needed.

Polymarket CLOB API

What it is. Polymarket's Central Limit Order Book — order matching is off-chain (low latency), settlement is on-chain (Polygon). REST + WebSocket APIs.

Used in: PolyMarketAI — algorithmic prediction-market trading.

Adjacent libraries: NumPy, Scikit-learn, Pandas for ML predictions. Celery for scheduled scraping. NewsAPI + feedparser for news ingest. tenacity for retry/rate-limit handling. python-telegram-bot for trade alerts.

Chain-specific notes

  • Ethereum mainnet — gas is expensive; the giving-garden uses an L2 in practice.
  • Base — Coinbase's L2 on top of Ethereum (OP Stack). Cheap gas, USD-denominated UX. Target chain for OnChainKit-app.
  • Polygon — Polymarket runs here. EVM-compatible.
  • Solana / Cosmos / Bitcoin — not used. The portfolio is EVM-focused.

Comparison alternatives (not used)

Library Notes
Foundry Solidity-native dev tools. Hardhat fills the role today.
web3.js Older Ethereum lib. ethers / viem replaced it.
Privy / Dynamic / Magic Embedded-wallet auth (email → wallet). RainbowKit + WalletConnect cover the BYOW use case.
Alchemy / Infura / QuickNode SDKs RPC providers. The wagmi apps use these as the underlying RPC, but no app surface code calls them directly.

Decision guide

Building an EVM dApp in React?         wagmi + viem.
Want a polished wallet-connect UI?     RainbowKit (general) or OnChainKit (Base).
Writing smart contracts?               OpenZeppelin libraries + Hardhat or Foundry.
Need on-chain history / analytics?     The Graph subgraph.
Need DAO governance?                   OpenZeppelin Governor.
Algorithmic on-chain trading?          Direct CLOB / DEX APIs (Polymarket pattern).
"Should we add Solana?"                Only if a customer needs it — the portfolio's stack is EVM.