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\n \"ChainGate\"\n

\n\n

ChainGate

\n\n

\n The Bitcoin & Ethereum SDK for TypeScript and Node.js.\n
\n Multi-chain wallets, balances, transaction history, fee estimation, signing, and broadcast across UTXO and EVM chains — from a single npm package.\n

\n\n

\n \"Build\"\n \"Test\"\n \"Publish\"\n \"npm\n \"npm\n \"Documentation\"\n \"Get\n \"Node.js= 22\" />\n \"TypeScript\"\n

\n\n---\n\n

\n 📖 Documentation   |   🔑 Get your free API key\n

\n\n---\n\n## What is ChainGate?\n\nChainGate is a cross-platform blockchain SDK and multi-blockchain integration library for TypeScript and Node.js. It is a modern, batteries-included **bitcoinjs-lib alternative** that also covers EVM chains, so you can send Bitcoin, Ethereum, Avalanche, Litecoin, Dogecoin, Bitcoin Cash, and ERC-20/NFT transactions from a single `npm install chaingate` — no more stitching together `bitcoinjs-lib`, `ethers`, `web3.js`, and five different explorer APIs.\n\nChainGate offers **three levels of support**, depending on the chain:\n\n- **Full API** — **Bitcoin, Bitcoin Testnet, Litecoin, Dogecoin, Bitcoin Cash, Ethereum, and Avalanche.** Some of the features available here include address transaction history, UTXO listings, mempool / pending transactions, real-time events, ERC-20 and NFT balance discovery, ERC-20 / ERC-721 / ERC-1155 metadata, native signing, broadcasting, fee estimation, and fiat pricing. A ChainGate-hosted RPC URL is included for every chain in this tier as well.\n- **RPC-only** — **Polygon, Arbitrum, Base, BNB Chain, and Sonic** ship with ChainGate-hosted JSON-RPC URLs. You get wallet creation, native-coin balance, signing + broadcasting (native, ERC-20, NFTs, arbitrary contract calls), and EIP-1559 gas estimation.\n- **Any RPC you want** — **Any other EVM chain** works by passing your own RPC URL to `cg.networks.evmRpc({ rpcUrl, chainId })` — same capabilities as the RPC-only tier above.\n\nUse it to:\n\n- Build a crypto wallet in JavaScript or TypeScript (Node.js or browser)\n- Send crypto transactions across UTXO and EVM chains\n- Check native-coin balance on every supported chain; check ERC-20 and NFT balances on Ethereum\n- Pull decoded transaction history on UTXO chains and Ethereum\n- Validate addresses for every supported chain (multichain address format checker)\n- Convert Bitcoin (satoshi ↔ BTC) and Ethereum (wei ↔ gwei ↔ ether) units\n- Derive private keys from a seed phrase (BIP-39 / BIP-32 / BIP-44 / BIP-84 / BIP-86)\n- Access hosted RPC endpoints for every supported chain without running your own node — or point ChainGate at any other EVM RPC URL\n- Track the current Ethereum gas price in gwei and estimate transaction fees before broadcasting\n- Get notified in real time of new blocks, balance changes and incoming or pending transactions for any address\n\n## Features\n\n- 👛 **Multi-chain wallet SDK** — Create HD wallets from mnemonics, or import from seed, xpriv, xpub, private key, WIF, or keystores\n- ⛓️ **Full API** — Balances, address transaction history, UTXOs, mempool / pending transactions, ERC-20 and NFT discovery, and fiat pricing on UTXO chains and Ethereum — with a hosted RPC URL for each one included too\n- ⚡ **RPC-only (hosted)** — Ready-to-use JSON-RPC URLs for the major EVM chains. Wallets, native balance, signing + broadcasting (native, ERC-20, NFTs, contract calls), gas estimation\n- 🔗 **Any RPC you want** — Same capabilities on any other EVM chain via `cg.networks.evmRpc({ rpcUrl, chainId })`\n- 📍 **Address derivation** — BIP-44 / BIP-84 / BIP-86 with segwit, legacy, taproot, cashaddr, and EOA\n- 🔍 **Blockchain explorer** — On UTXO chains and Ethereum: balances, transaction history, UTXOs, mempool / pending transactions, blocks, fees, ERC-20 / ERC-721 / ERC-1155 token metadata, and NFT data\n- ⚡ **Real-time events** — `onBlock()`, `onBalance()`, `onTransaction()`, `onPendingTransaction()`, `onMempoolTransaction()` and `onContractInteraction()` push typed events to your callbacks on every Full API chain — one shared connection per network, automatic reconnection, no polling\n- 📤 **Send crypto transactions in TypeScript** — Send native coins, ERC-20 tokens, NFTs, and call smart contracts with auto-suggested fees — on every supported chain\n- 🔒 **Encryption** — AES-256-GCM wallet encryption with password protection\n- ✍️ **Message signing** — EIP-191 (EVM) and Bitcoin-standard signing and verification\n- 💱 **Fiat conversion** — Live ETH/USD, BTC/USD, and conversion to 160+ currencies (UTXO chains and Ethereum)\n- 👁️ **View-only wallets** — Read-only access from xpub or public key\n- 🔧 **Unit converters included** — Bitcoin unit converter (satoshi ↔ BTC) and Ethereum unit converter (wei ↔ gwei ↔ ether) built into the `Amount` type\n- ⛽ **ETH gas tracker & fee estimator** — Current Ethereum gas price in gwei, EIP-1559 `maxFeePerGas` / `maxPriorityFeePerGas`, and ready-to-use fee presets. Works on every EVM chain reachable via RPC\n\n## Install\n\n```bash\nnpm install chaingate\n```\n\nThat's it — no signup, no environment variables, no setup. `new ChainGate()` works out of the box.\n\n## Examples\n\n### Send Bitcoin or Ethereum\n\nA full send flow — fee estimation, signing, and broadcast — works the same way on UTXO chains and EVM chains (Ethereum with full API, plus any other EVM chain via RPC):\n\n```ts\nimport { ChainGate, importWallet } from 'chaingate';\n\nconst cg = new ChainGate();\nconst wallet = importWallet({ phrase: 'abandon abandon abandon ...' });\n\n// --- Bitcoin (UTXO) ---\nconst btc = cg.connect(cg.networks.bitcoin, wallet);\nconst btcAmount = await cg.networks.bitcoin.amountFromCurrency('usd', 20); // $20 in BTC\nconst btcTx = await btc.transfer(btcAmount, 'bc1qRecipient...');\n\nconst btcFees = btcTx.recommendedFees();\nconsole.log(btcFees.normal.estimatedFeeSat); // fee in satoshis\nconsole.log(btcFees.normal.enoughFunds); // true if balance covers amount + fee\nbtcTx.setFee(btcFees.high);\n\nconst btcBroadcast = await btcTx.signAndBroadcast();\nconsole.log('BTC txid:', btcBroadcast.transactionId);\n\n// --- Ethereum (EVM) ---\nconst eth = cg.connect(cg.networks.ethereum, wallet);\nconst ethAmount = cg.networks.ethereum.amount('0.01'); // 0.01 ETH\nconst ethTx = await eth.transfer(ethAmount, '0xRecipient...');\n\nconst ethFees = ethTx.recommendedFees();\nconsole.log(ethFees.normal.maxFeePerGas); // EIP-1559 fee in wei\nethTx.setFee(ethFees.high);\n\nconst ethBroadcast = await ethTx.signAndBroadcast();\nconsole.log('ETH txHash:', ethBroadcast.transactionId);\n```\n\n### Send Litecoin, Dogecoin, or Bitcoin Cash\n\nThe same `transfer()` API covers every UTXO chain — just swap the network:\n\n```ts\n// Litecoin\nconst ltc = cg.connect(cg.networks.litecoin, wallet);\nconst ltcAmount = cg.networks.litecoin.amount('0.1'); // 0.1 LTC\nawait (await ltc.transfer(ltcAmount, 'ltc1q...')).signAndBroadcast();\n\n// Dogecoin\nconst doge = cg.connect(cg.networks.dogecoin, wallet);\nconst dogeAmount = cg.networks.dogecoin.amount('100'); // 100 DOGE\nawait (await doge.transfer(dogeAmount, 'D...')).signAndBroadcast();\n\n// Bitcoin Cash\nconst bch = cg.connect(cg.networks.bitcoincash, wallet);\nconst bchAmount = cg.networks.bitcoincash.amount('0.05'); // 0.05 BCH\nawait (await bch.transfer(bchAmount, 'bitcoincash:q...')).signAndBroadcast();\n```\n\n### Check Crypto Balance\n\nPull the native-coin balance for any wallet or address on any supported chain. On **UTXO chains and Ethereum** you also get the confirmed / unconfirmed split and live fiat pricing in USD, EUR, or any of 160+ currencies from the same call. On **EVM chains accessed via RPC** you get the native balance read directly from the JSON-RPC node — no fiat conversion (that needs market data, which a JSON-RPC node doesn't serve).\n\n```ts\n// Ethereum (EVM)\nconst eth = cg.connect(cg.networks.ethereum, wallet);\nconst ethBalance = await eth.addressBalance();\nconst ethUsd = await ethBalance.confirmed.toCurrency('usd'); // live ETH/USD\nconsole.log(`${ethBalance.confirmed.base()} ETH ($${ethUsd})`);\n\n// Bitcoin (UTXO)\nconst btc = cg.connect(cg.networks.bitcoin, wallet);\nconst btcBalance = await btc.addressBalance();\nconst btcUsd = await btcBalance.confirmed.toCurrency('usd'); // live BTC/USD\nconsole.log(`${btcBalance.confirmed.base()} BTC ($${btcUsd})`);\n```\n\n### Create a Multi-Chain Wallet\n\nOne BIP-39 mnemonic, addresses for every supported chain:\n\n```ts\nimport { ChainGate, newWallet } from 'chaingate';\n\nconst cg = new ChainGate();\n\nconst { phrase, wallet } = newWallet(); // 12-word BIP-39 mnemonic\nconsole.log('Mnemonic:', phrase);\n\n// Same wallet, multiple chains\nconst ethAddress = await cg.connect(cg.networks.ethereum, wallet).address();\nconst btcAddress = await cg.connect(cg.networks.bitcoin, wallet).address();\n\nconsole.log({ ethAddress, btcAddress });\n```\n\n### Derive Private Keys from a Seed Phrase\n\nBIP-32 / BIP-44 / BIP-84 / BIP-86 derivation with custom paths, for any chain:\n\n```ts\nimport { importWallet } from 'chaingate';\n\nconst wallet = importWallet({ phrase: 'abandon abandon abandon ...' });\n\n// Ethereum (BIP-44, coin type 60)\nconst eth = await wallet.derive(\"m/44'/60'/0'/0/5\");\nconsole.log(eth.privateKey.hex); // derived ETH private key as hex\n\n// Bitcoin SegWit (BIP-84, coin type 0)\nconst btc = await wallet.derive(\"m/84'/0'/0'/0/0\");\nconsole.log(btc.privateKey.hex); // derived BTC private key\nconsole.log(btc.xpriv); // extended private key\n```\n\n### Token Balances (ERC-20, ERC-721, ERC-1155) — Ethereum only\n\nEvery ERC-20 holding and every NFT owned by an Ethereum address, returned in one request — contract metadata, symbols, decimals, and token counts arrive pre-decoded. Token / NFT balance discovery is Ethereum-only among the EVM chains; a plain JSON-RPC endpoint cannot answer this query, so `addressTokenBalances()` is not available on EVM chains accessed via RPC.\n\n```ts\nconst eth = cg.connect(cg.networks.ethereum, wallet);\n\nconst tokens = await eth.addressTokenBalances();\n\nfor (const token of tokens) {\n if (token.isNFT) {\n console.log(`${token.name} -- ${token.ownedTokens.length} NFTs`);\n } else {\n console.log(`${token.base()} ${token.symbol}`); // e.g. \"1500.50 USDC\"\n }\n}\n```\n\n### Check a Token Before Buying (ERC-20 Metadata)\n\nConfirm a contract's `name`, `symbol`, and `decimals` before approving or swapping — a simple safety check before buying any ERC-20:\n\n```ts\nconst explorer = cg.explore(cg.networks.ethereum);\nconst info = await explorer.getTokenData('0xA0b8...eB48');\n\nconsole.log(info.name); // \"USD Coin\"\nconsole.log(info.symbol); // \"USDC\"\nconsole.log(info.decimals); // 6\nconsole.log(info.standard); // \"ERC20\"\n```\n\n### Transaction History & Pending Mempool Transactions\n\nPull transaction history for any address on UTXO chains (Bitcoin, Litecoin, Dogecoin, Bitcoin Cash) and Ethereum. On Ethereum, every transaction arrives with decoded actions — token transfers, approvals, wraps, unwraps, mints, burns, and internal calls pre-classified by type. On UTXO chains you can also peek at unconfirmed activity sitting in the mempool. Address history is not available on EVM chains accessed via RPC — a JSON-RPC node cannot answer those queries.\n\n```ts\n// Ethereum — decoded actions per transaction\nconst eth = cg.connect(cg.networks.ethereum, wallet);\nconst ethHistory = await eth.addressHistory();\n\nfor (const tx of ethHistory.transactions) {\n console.log(tx.txHash, new Date(tx.timestamp * 1000));\n\n // Decoded actions relevant to your address\n for (const action of tx.actions) {\n // action.type: \"transfer_in\", \"transfer_out\", \"mint\", \"burn\", \"wrap\", \"unwrap\", ...\n // action.token: { name, symbol, decimals, logoUrl }\n // action.contract: contract address or \"native\" for ETH transfers\n console.log(` ${action.type} on ${action.token.symbol ?? 'ETH'}`);\n }\n}\n\n// UTXO — confirmed transactions with fiat conversion\nconst btc = cg.connect(cg.networks.bitcoin, wallet);\nconst btcHistory = await btc.addressHistory();\n\nfor (const tx of btcHistory.transactions) {\n const usd = await tx.amount.toCurrency('usd');\n console.log(`${tx.txid}: ${tx.amount.base()} BTC ($${usd})`);\n}\n\n// Unconfirmed / pending transactions from the mempool (UTXO chains)\nconst btcExplorer = cg.explore(cg.networks.bitcoin);\nconst mempool = await btcExplorer.getMempool();\nconsole.log(`${mempool.transactions.length} pending transactions in the mempool`);\n```\n\n### Real-Time Events — Blocks, Balances & Transactions over WebSocket\n\nStop polling. Subscribe with a callback and ChainGate pushes new blocks, balance changes, transactions and pending activity to you — on Bitcoin, Litecoin, Dogecoin, Bitcoin Cash, Bitcoin Testnet, Ethereum and Avalanche. The connection is opened, shared, kept alive and reconnected for you; every event is a typed object with `Amount` values.\n\n```ts\nconst btc = cg.explore(cg.networks.bitcoin);\n\n// Every new block\nbtc.onBlock((block) => console.log(`Block ${block.height} — ${block.numTxs} txs`));\n\n// Balance of any address, after every block that changes it\nbtc.onBalance('bc1q...', async ({ confirmed }) => {\n console.log(confirmed.base(), 'BTC ≈', await confirmed.toCurrency('usd'), 'USD');\n});\n\n// Or follow your own wallet — the address is derived for you\nconst wallet = cg.connect(cg.networks.ethereum, myWallet);\nconst sub = wallet.onTransaction(({ height }) => console.log('Activity in block', height));\nawait sub.ready; // confirmed by the server\nsub.unsubscribe(); // done — the last subscription closes the connection\n\n// Also: onFullBlock, onPendingBalance, onPendingTransaction, onMempoolTransaction,\n// onContractInteraction (EVM), and onError for connection errors.\n```\n\nTransaction confirmations use the same events: `broadcasted.onConfirmed()` fires as soon as the block that includes your transaction is finalized.\n\n### Import a Wallet\n\nRestore an existing wallet from any common format — mnemonic seed phrase, raw private key, xpub for view-only access, WIF, or an extended key — with auto-detection for arbitrary strings:\n\n```ts\nimport { importWallet, createWalletFromString } from 'chaingate';\n\n// From mnemonic (seed phrase)\nconst wallet = importWallet({ phrase: 'abandon abandon abandon ...' });\n\n// From private key\nimportWallet({ privateKey: '0x...' });\n\n// From xpub (view-only)\nimportWallet({ xpub: 'xpub...' });\n\n// Auto-detect any format\nconst wallet = createWalletFromString('xprv9s21ZrQH143K...');\n```\n\n### Send ERC-20 Tokens\n\nTransfer USDC, USDT, DAI, or any ERC-20 token by contract address. Gas estimation, nonce handling, and the `transfer()` ABI call are done for you:\n\n```ts\nconst eth = cg.connect(cg.networks.ethereum, wallet);\n\nconst usdc = cg.networks.ethereum.amount('100', {\n contractAddress: '0xA0b8...eB48',\n decimals: 6,\n symbol: 'USDC',\n});\n\nconst tx = await eth.transferToken(usdc, '0xRecipient...');\nawait tx.signAndBroadcast();\n```\n\n### Send NFTs\n\nMove an ERC-721 or ERC-1155 token between Ethereum addresses with one call — no manual ABI encoding, no contract wiring:\n\n```ts\n// ERC-721\nconst tx = await eth.transferNft('0xNftContract...', '0xRecipient...', tokenId);\n\n// ERC-1155 (with quantity)\nconst tx = await eth.transferErc1155('0xNftContract...', tokenId, 5, '0xRecipient...');\n```\n\n### Connect to Any EVM Chain (RPC-only)\n\nChainGate ships with free, ready-to-use JSON-RPC URLs for the major EVM chains — drop them into `ethers`, `viem`, `web3.js`, or into ChainGate's built-in `evmRpc()` connector. No separate Alchemy / Infura / archive-node subscription required.\n\nOn EVM chains accessed via RPC, ChainGate can derive addresses, read native-coin balance, estimate gas, and sign + broadcast every kind of transaction (native transfer, ERC-20, ERC-721 / ERC-1155 NFTs, arbitrary contract calls). **Not available:** address transaction history and token / NFT balance discovery — those queries aren't part of the JSON-RPC interface.\n\n```ts\nconst cg = new ChainGate();\n\n// Pre-built ChainGate RPC URLs (signing, broadcasting, gas, native balance;\n// no address history or token discovery through a JSON-RPC endpoint)\ncg.rpcUrls.ethereum; // Ethereum (also via cg.networks.ethereum for full features)\ncg.rpcUrls.avalanche; // Avalanche (also via cg.networks.avalanche for full features)\ncg.rpcUrls.polygon; // Polygon\ncg.rpcUrls.arbitrum; // Arbitrum\ncg.rpcUrls.base; // Base\ncg.rpcUrls.bnb; // BNB Smart Chain\ncg.rpcUrls.sonic; // Sonic\n\n// Use a curated URL with the evmRpc connector\nconst bsc = cg.networks.evmRpc({\n rpcUrl: cg.rpcUrls.bnb,\n chainId: 56,\n name: 'BNB Smart Chain',\n symbol: 'BNB',\n});\n\n// Or point evmRpc at ANY JSON-RPC endpoint — your own node, a public RPC,\n// any EVM mainnet or testnet\nconst customChain = cg.networks.evmRpc({\n rpcUrl: 'https://your-rpc-url', // any EVM JSON-RPC URL works\n chainId: 1,\n name: 'My Chain',\n symbol: 'TOKEN',\n});\n\nconst conn = cg.connect(customChain, wallet);\nconst { balance } = await conn.addressBalance(); // native balance\nconst tx = await conn.transfer(customChain.amount('1'), '0xRecipient...'); // sign + broadcast\nawait tx.signAndBroadcast();\n// conn.addressHistory() and conn.addressTokenBalances() are not exposed on\n// the RPC-only connector — a JSON-RPC node cannot answer those queries.\n```\n\n### Encrypt and Save a Wallet\n\nEncrypt a wallet with a user-supplied password (AES-256-GCM) and serialize it to a string you can persist anywhere — localStorage, IndexedDB, a file, or your own backend — then decrypt it on demand:\n\n```ts\nawait wallet.encrypt('my-password');\nconst data = wallet.serialize();\n\n// Restore later\nimport { deserializeWallet } from 'chaingate';\nconst restored = deserializeWallet(data, async () => {\n return prompt('Enter password:');\n});\n```\n\n### Multichain Address Format Checker / Ethereum Address Validator\n\nValidate addresses for every supported chain with a single API — a drop-in Ethereum address validator *and* multichain address format checker:\n\n```ts\ncg.networks.ethereum.isValidAddress('0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B'); // true\ncg.networks.bitcoin.isValidAddress('bc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4'); // true\ncg.networks.litecoin.isValidAddress('ltc1qw508d6qejxtdg4y5r3zarvary0c5xw7kv8f3t4'); // true\ncg.networks.dogecoin.isValidAddress('DQA5APpAJi2f1YVfKjSgf1fzS8RvMgQrM3'); // true\ncg.networks.bitcoincash.isValidAddress('bitcoincash:qpm2qsznhks23z7629mms6s4cwef74vcwvy22gdx6a'); // true\n\ncg.networks.bitcoin.isValidAddress('0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B'); // false\ncg.networks.ethereum.isValidAddress('not-an-address'); // false\n```\n\n### Ethereum & Bitcoin Unit Converter\n\nEvery `Amount` carries both its smallest unit (wei, satoshi) and its decimal form — no more `BigNumber.from(10).pow(18)` boilerplate:\n\n```ts\nconst eth = cg.networks.ethereum.amount('1.5'); // 1.5 ETH\nconsole.log(eth.base()); // 1.5\nconsole.log(eth.min()); // 1500000000000000000n (wei)\n\nconst btc = cg.networks.bitcoin.amount('0.01'); // 0.01 BTC\nconsole.log(btc.base()); // 0.01\nconsole.log(btc.min()); // 1000000n (satoshi)\n\n// Live ETH/USD, BTC/USD, and 160+ other fiat currencies\nconsole.log(await eth.toCurrency('usd')); // current ETH USD value\nconsole.log(await btc.toCurrency('eur'));\n```\n\n### Sign Messages\n\nSign and verify messages with EIP-191 `personal_sign` on EVM chains, or Bitcoin-standard message signing on UTXO chains:\n\n```ts\nimport { signEvmMessage, verifyEvmMessage } from 'chaingate';\n\n// EVM (EIP-191)\nconst signature = signEvmMessage('Hello', privateKey);\nconst isValid = verifyEvmMessage('Hello', signature, address);\n```\n\n### ETH Gas Tracker — Current Ethereum Gas Price in Gwei\n\nPull the current Ethereum gas price with EIP-1559 parameters straight from the SDK — no scraping required. `maxFeePerGas` and `maxPriorityFeePerGas` are returned as `bigint` wei values; divide by 1e9 for gwei:\n\n```ts\nconst eth = cg.connect(cg.networks.ethereum, wallet);\n\n// Get current ETH gas price + EIP-1559 fee rates\nconst tx = await eth.transfer(amount, '0xRecipient...');\nconst fees = tx.recommendedFees();\n\nconst toGwei = (wei: bigint) => Number(wei) / 1e9;\n\nconsole.log(`Current ETH gas price: ${toGwei(fees.normal.maxFeePerGas)} gwei`);\nconsole.log(`Priority tip: ${toGwei(fees.normal.maxPriorityFeePerGas)} gwei`);\nconsole.log(`Expected confirmation: ~${fees.normal.estimatedConfirmationSecs}s`);\nconsole.log(`Enough funds: ${fees.normal.enoughFunds}`);\n```\n\n### Ethereum Gas Fees Calculator — Estimate Transaction Fees\n\nCompare every fee tier before broadcasting — a lightweight Ethereum gas fees calculator built into every transaction. Four tiers are returned: `low`, `normal`, `high`, and `maximum`:\n\n```ts\nconst tx = await eth.transferToken(usdc, '0xRecipient...');\nconst fees = tx.recommendedFees();\n\nconst toGwei = (wei: bigint) => Number(wei) / 1e9;\n\nconsole.table({\n low: { gwei: toGwei(fees.low.maxFeePerGas), sec: fees.low.estimatedConfirmationSecs },\n normal: { gwei: toGwei(fees.normal.maxFeePerGas), sec: fees.normal.estimatedConfirmationSecs },\n high: { gwei: toGwei(fees.high.maxFeePerGas), sec: fees.high.estimatedConfirmationSecs },\n maximum: { gwei: toGwei(fees.maximum.maxFeePerGas), sec: fees.maximum.estimatedConfirmationSecs },\n});\n\ntx.setFee(fees.normal); // pick whichever tier you prefer\n```\n\n### Polygon Gas Station & Multi-chain Gas Prices\n\nThe same `recommendedFees()` API works on every EVM chain reachable via RPC. Here it is on Polygon:\n\n```ts\nconst polygon = cg.networks.evmRpc({\n rpcUrl: cg.rpcUrls.polygon,\n chainId: 137,\n name: 'Polygon',\n symbol: 'POL',\n});\n\nconst pol = cg.connect(polygon, wallet);\nconst tx = await pol.transfer(amount, '0xRecipient...');\nconst fees = tx.recommendedFees();\n\nconst gwei = Number(fees.normal.maxFeePerGas) / 1e9;\nconsole.log(`Polygon gas price: ${gwei} gwei`);\n```\n\nRun the same pattern on every chain to compare `maxFeePerGas × gasLimit` and pick the cheapest one for each transfer.\n\n## Supported Networks\n\n### Full API support\n\nEverything the SDK offers: address transaction history, UTXO listings, mempool / pending transactions, ERC-20 / ERC-721 / ERC-1155 discovery and metadata, fiat pricing, fee estimation, signing, and broadcasting — plus a ChainGate-hosted JSON-RPC URL for direct node access.\n\n| Network | Address Types | RPC URL |\n| --------------- | ----------------------- | --------------------------- |\n| Bitcoin | segwit, legacy, taproot | `cg.rpcUrls.bitcoin` |\n| Bitcoin Testnet | segwit, legacy, taproot | `cg.rpcUrls.bitcoinTestnet` |\n| Litecoin | segwit, legacy | `cg.rpcUrls.litecoin` |\n| Dogecoin | legacy | `cg.rpcUrls.dogecoin` |\n| Bitcoin Cash | cashaddr, legacy | `cg.rpcUrls.bitcoincash` |\n| Ethereum | EOA | `cg.rpcUrls.ethereum` |\n| Avalanche | EOA | `cg.rpcUrls.avalanche` |\n\n### RPC-only (hosted)\n\nWallets, native-coin balance, signing, broadcasting (native, ERC-20, NFTs, arbitrary contract calls), and EIP-1559 gas estimation via a ChainGate-hosted JSON-RPC endpoint. **Not available:** address transaction history and token / NFT balance discovery — these aren't part of the JSON-RPC spec.\n\n| Network | Address Types | RPC URL |\n| --------- | ------------- | ---------------------- |\n| Polygon | EOA | `cg.rpcUrls.polygon` |\n| Arbitrum | EOA | `cg.rpcUrls.arbitrum` |\n| Base | EOA | `cg.rpcUrls.base` |\n| BNB Chain | EOA | `cg.rpcUrls.bnb` |\n| Sonic | EOA | `cg.rpcUrls.sonic` |\n\n### Any RPC you want\n\nSame capabilities as the hosted tier, on any other EVM chain — Optimism, Linea, Scroll, Gnosis, a testnet, your own node, anything EVM-compatible — by passing the JSON-RPC URL to `cg.networks.evmRpc({ rpcUrl, chainId, name, symbol })`.\n\nFree ChainGate-hosted RPC proxy URLs are included for every curated chain above — a drop-in alternative to hosting your own node.\n\n## API Key (optional, free)\n\nChainGate works **without an API key** out of the box — no signup, no setup, just `new ChainGate()` and you're querying the network. Every example above runs unchanged on the keyless tier.\n\nThe keyless tier is rate-limited per IP, so once you start hammering endpoints from a real app you'll eventually hit a `RateLimitError`:\n\n```ts\n// ChainGate rate limit reached on the keyless tier. Get a free API key at\n// https://api.chaingate.dev and pass it as `new ChainGate({ apiKey })` to raise\n// your quota.\n```\n\nWhen that happens, grab a **free API key** at [api.chaingate.dev](https://api.chaingate.dev) and pass it once at construction:\n\n```ts\nconst cg = new ChainGate({ apiKey: 'your-api-key' });\n```\n\nEverything else stays the same — the API key only raises the quota.\n\n## FAQ\n\n### Which networks does ChainGate support?\n\nChainGate offers **three levels** of support:\n\n- **Full API** — Bitcoin, Bitcoin Testnet, Litecoin, Dogecoin, Bitcoin Cash, Ethereum, and Avalanche, with native + ERC-20 / NFT balances, address transaction history, UTXO and mempool data, explorer endpoints, fiat pricing, fee estimation, signing, broadcasting, and a hosted JSON-RPC URL per chain.\n- **RPC-only (hosted)** — Polygon, Arbitrum, Base, BNB Chain, and Sonic ship with first-party ChainGate JSON-RPC URLs. Wallets, native-coin balance, signing + broadcasting (native / ERC-20 / NFTs / contract calls), gas estimation — no address transaction history or token / NFT balance discovery.\n- **Any RPC you want** — Any other EVM chain (Optimism, Linea, Scroll, Gnosis, testnets, your own node, …) works through `cg.networks.evmRpc({ rpcUrl, chainId })` — you bring the JSON-RPC endpoint, same capabilities as the hosted tier.\n\n### Can I get real-time events instead of polling?\n\nYes. On every Full API chain, `cg.explore(network)` and `cg.connect(network, wallet)` expose `onBlock()`, `onBalance()`, `onTransaction()`, `onPendingBalance()`, `onPendingTransaction()`, `onMempoolTransaction()` and — on Ethereum and Avalanche — `onContractInteraction()`. Each returns a subscription with `ready`, `address` and `unsubscribe()`; one WebSocket connection per network is shared by all of them and reconnected automatically. Events are included with the free API key and work without one too.\n\n### Can I use ChainGate in the browser?\n\nYes. The package ships as ESM + CJS and uses browser-compatible crypto. It works in modern browsers, Node.js ≥ 22, and Bun. Signing always happens client-side.\n\n### Is my private key or seed phrase ever sent to ChainGate servers?\n\nNo. Wallet construction, key derivation, and signing run locally. ChainGate's backend only proxies JSON-RPC requests and broadcasts already-signed raw transactions.\n\n### How do I get the current gas price in gwei for a transaction?\n\nBuild the transaction with `transfer()` or `transferToken()`, then call `tx.recommendedFees()`. You get four tiers (`low`, `normal`, `high`, `maximum`) with `maxFeePerGas` and `maxPriorityFeePerGas` as `bigint` wei values. Divide by `1e9` for gwei, multiply by `gasLimit` for the total fee in ETH.\n\n### How does ChainGate compare to ethers.js, web3.js, or bitcoinjs-lib?\n\n`ethers` and `web3.js` cover EVM only; `bitcoinjs-lib` covers Bitcoin only. ChainGate covers both — plus every major UTXO chain with full feature support, and every EVM chain reachable by a JSON-RPC URL — behind one consistent API. Signing, broadcasting, and fee estimation work everywhere; UTXO handling, decoded transaction history, token / NFT discovery, and fiat conversion are available on UTXO chains and Ethereum.\n\n### Can I point ChainGate at my own RPC node?\n\nYes. `cg.networks.evmRpc({ rpcUrl, chainId, name, symbol })` accepts any JSON-RPC URL — your own node, Alchemy, Infura, QuickNode, a public RPC, or ChainGate's proxy — and returns the same `transfer()`, `recommendedFees()`, and balance APIs.\n\n### Which chain should I use to minimize transaction fees?\n\nGas prices change block by block, so the answer shifts throughout the day. L2s (Arbitrum, Base, Optimism, Linea, Scroll) and alt-L1s (Polygon, Avalanche, BNB, Sonic, Celo) are usually far cheaper than Ethereum mainnet. Since `recommendedFees()` works everywhere, you can compare `maxFeePerGas × gasLimit` across chains at runtime and route the transfer to whichever is cheapest.\n\n---\n\n

\n 📖 Read the full docs\n

\n","readmeFilename":"README.md"}