Universal cryptocurrency utilities for wallet address validation, unit conversion, chain registry, gas estimation, ERC-20 token registry, calldata / function-selector decoding, and transaction hash parsing. Zero browser or Node-specific dependencies — runs unchanged under Node ≥ 18, Bun, modern browsers, and Web Workers. Not a wallet, not a signing library — just pure utility primitives.

Documentation tree

address — Provides the three address / hash validation primitives that the rest of the package builds on: validateAddress for c…
- validator — Provides the three address / hash validation primitives that the rest of the package builds on: validateAddress for c…
chain-data — Holds the canonical CHAINS constant: a Record<ChainId, ChainInfo> containing one entry per supported mainnet networ…
chain-registry — Provides the async chain-registry façade for callers that need dynamic chain data — custom mainnet sets, runtime regist…
registry — Exposes the synchronous fast-path over the built-in CHAINS constant. Every helper here is a pure function that reads…
error-codes — Declares the stable, namespaced error registry for @suaveplan/cryptocurrency and the typed CryptocurrencyError clas…
- error-codes — Declares the stable, namespaced error registry for @suaveplan/cryptocurrency and the typed CryptocurrencyError clas…
gas — Provides EIP-1559 gas-estimation primitives for Ethereum-style chains. Every helper accepts and returns bigint values…
- gas-estimator — Provides EIP-1559 gas-estimation primitives for Ethereum-style chains. Every helper accepts and returns bigint values…
token-data — Provides the COMMON_TOKENS constant: a curated list of eight well-known ERC-20 tokens on Ethereum mainnet — USDT, USD…
token-registry — Provides the TokenRegistry class for adding, retrieving, and searching ERC-20 / token information across chains, plus…
transaction — Provides naive transaction-hash classification and 4-byte function-selector decoding for EVM calldata. decodeTxHash c…
- tx-decoder — Provides naive transaction-hash classification and 4-byte function-selector decoding for EVM calldata. decodeTxHash c…
units — Provides generic and convenience unit conversion for cryptocurrency denominations. The generic convertUnits operates…
- converter — Provides generic and convenience unit conversion for cryptocurrency denominations. The generic convertUnits operates…

Install

bun add @suaveplan/cryptocurrency

Quick start

import {
    estimateGas,
    formatGwei,
    getChain,
    getExplorerTxUrl,
    satoshiToBitcoin,
    validateAddress,
    weiToEther,
} from "@suaveplan/cryptocurrency";

// Multi-chain address validation with auto-detection
const r = validateAddress("0x742d35Cc6634C0532925a3b844Bc9e7595f2bD28");
// { valid: true, normalized: "0x...", chains: ["ethereum", "polygon", ...] }

// Unit conversion (bigint-pure)
weiToEther("1000000000000000000");  // "1"
satoshiToBitcoin("100000000");      // "1"

// Chain metadata + explorer URLs
const eth = getChain("ethereum");
// { id: "ethereum", evmChainId: 1, decimals: 18, ... }
const url = getExplorerTxUrl("ethereum", "0xabc...");

// EIP-1559 gas estimation
const estimate = estimateGas({
    gasLimit: 21000n,
    baseFeePerGas: 30000000000n,
    maxPriorityFeePerGas: 2000000000n,
});
formatGwei(estimate.gasPrice); // "32"

Features

Address validation across 15 chains (Bitcoin, Ethereum, Solana, Polygon, Arbitrum, Optimism, Avalanche, BSC, Base, TRON, Litecoin, Dogecoin, Cardano, Polkadot, Cosmos) via validateAddress / validateAddressForChain.
Transaction hash classification (EVM / UTXO / Solana) via validateTxHash and decodeTxHash.
EIP-55 checksumming for EVM addresses (simplified positional algorithm preserved from upstream; full keccak256 deferred to a follow-up change).
Static chain registry with getChain / getAllChainIds / getEvmChains / getChainByEvmId / explorer URL helpers.
Async chain registry (ChainRegistry + MemoryChainRegistry) supporting custom adapters and typed CryptocurrencyError({ code: CRYPTOCURRENCY.UNKNOWN_CHAIN }).
Bigint-pure unit conversion across ETH / BTC / SOL (convertUnits, weiToEther, etherToWei, gweiToEther, satoshiToBitcoin, bitcoinToSatoshi, lamportToSol, getUnits).
EIP-1559 gas estimation (estimateGas, calculateMaxFeePerGas, calculateEffectiveGasPrice, formatGwei, estimateTxCostEth).
ERC-20 token registry (TokenRegistry, COMMON_TOKENS, formatTokenBalance) — case-insensitive address lookups, substring search by symbol / name.
Calldata + function-selector decoder (KNOWN_SELECTORS, lookupSelector, extractSelector, decodeCalldata).
Typed CryptocurrencyError hierarchy with CRYPTOCURRENCY.* code registry and optional chainId / currency / unit discriminants.
Optional LoggerLike injection on ChainRegistry (no-op default) emitting chain.registered / chain.lookup.miss events.
Tree-shakeable subpath exports — import only what you use.
Universal tier — no node:*, no bun:*, no fs / path / crypto imports.

Modules

Co-located docs for every implementation file:

src/address/validator.md — validateAddress, validateAddressForChain, validateTxHash.
src/chains/chain-data.md — CHAINS constant.
src/chains/chain-registry.md — ChainRegistry, MemoryChainRegistry, LoggerLike integration.
src/chains/registry.md — synchronous getters.
src/error-codes/error-codes.md — CRYPTOCURRENCY_CODES, CryptocurrencyError.
src/gas/gas-estimator.md — EIP-1559 gas helpers.
src/tokens/token-data.md — COMMON_TOKENS.
src/tokens/token-registry.md — TokenRegistry, formatTokenBalance.
src/transaction/tx-decoder.md — calldata / selector / tx-hash decoder.
src/types/crypto.types.md — public type contract.
src/units/converter.md — generic + convenience unit conversion.

Subpath exports

Every public module ships its own subpath so consumers can tree-shake:

import { validateAddress } from "@suaveplan/cryptocurrency/address/validator";
import { CHAINS } from "@suaveplan/cryptocurrency/chains/chain-data";
import { ChainRegistry } from "@suaveplan/cryptocurrency/chains/chain-registry";
import { getChain } from "@suaveplan/cryptocurrency/chains/registry";
import { CRYPTOCURRENCY_CODES } from "@suaveplan/cryptocurrency/error-codes/error-codes";
import { estimateGas } from "@suaveplan/cryptocurrency/gas/gas-estimator";
import { COMMON_TOKENS } from "@suaveplan/cryptocurrency/tokens/token-data";
import { TokenRegistry } from "@suaveplan/cryptocurrency/tokens/token-registry";
import { decodeCalldata } from "@suaveplan/cryptocurrency/transaction/tx-decoder";
import type { ChainInfo } from "@suaveplan/cryptocurrency/types/crypto.types";
import { convertUnits } from "@suaveplan/cryptocurrency/units/converter";

Error handling

import {
    CRYPTOCURRENCY_CODES,
    CryptocurrencyError,
    convertUnits,
} from "@suaveplan/cryptocurrency";

try {
    convertUnits("1", "wei", "ether", "XYZ");
} catch (err) {
    if (err instanceof CryptocurrencyError) {
        if (err.code === CRYPTOCURRENCY_CODES.UNKNOWN_CURRENCY) {
            console.error(`unsupported currency: ${err.currency}`);
        }
    }
}

What this package is not

Not a wallet — no key management, no transaction signing.
Not an RPC client — no on-chain calls; the ChainRegistry adapter contract lets you wire your own RPC layer.
Not an ABI decoder — decodeCalldata only recognises 4-byte selectors. Full ABI decoding (dynamic types, tuples) lands in a follow-up change.
Not an ENS resolver — name-resolution lands in a separate package.
Not RFC-correct EIP-55 — uses a simplified positional checksum preserved from upstream; full keccak256 lands in a follow-up change.

License

MIT