Mainnet: https://api.mainnet-beta.solana.com
Devnet:  https://api.devnet.solana.com
Testnet: https://api.testnet.solana.com

import urllib.request, json
RPC = "https://api.mainnet-beta.solana.com"
def rpc(method, params=[]):
    payload = json.dumps({
        "jsonrpc": "2.0", "id": 1,
        "method": method, "params": params
    }).encode()
    req = urllib.request.Request(
        RPC, data=payload,
        headers={"Content-Type": "application/json"}
    )
    with urllib.request.urlopen(req, timeout=10) as r:
        resp = json.loads(r.read())
    if "error" in resp:
        raise Exception(resp["error"])
    return resp["result"]

def get_sol_balance(pubkey):
    result = rpc("getBalance", [pubkey])
    return result["value"] / 1e9  # lamports → SOL
addr = "YourWalletPublicKey..."
print(f"Balance: {get_sol_balance(addr):.4f} SOL")

def get_token_accounts(pubkey):
    result = rpc("getTokenAccountsByOwner", [
        pubkey,
        {"programId": "TokenkegQfeZyiNwAJbNbGKPFXCWuBvf9Ss623VQ5DA"},
        {"encoding": "jsonParsed"}
    ])
    return result["value"]
accounts = get_token_accounts(addr)
for acc in accounts:
    info = acc["account"]["data"]["parsed"]["info"]
    mint = info["mint"]
    amount = info["tokenAmount"]["uiAmount"]
    print(f"Token: {mint[:8]}... Balance: {amount}")

def get_tx(signature):
    return rpc("getTransaction", [
        signature,
        {"encoding": "jsonParsed", "maxSupportedTransactionVersion": 0}
    ])
def get_recent_txs(pubkey, limit=10):
    sigs = rpc("getSignaturesForAddress", [pubkey, {"limit": limit}])
    return [s["signature"] for s in sigs]

def get_account(pubkey):
    return rpc("getAccountInfo", [pubkey, {"encoding": "jsonParsed"}])
info = get_account(addr)
print(f"Lamports: {info['value']['lamports']}")
print(f"Owner: {info['value']['owner']}")
print(f"Executable: {info['value']['executable']}")

def get_slot():
    return rpc("getSlot")
def get_epoch_info():
    return rpc("getEpochInfo")
def get_recent_performance():
    return rpc("getRecentPerformanceSamples", [5])
print(f"Current slot: {get_slot()}")
epoch = get_epoch_info()
print(f"Epoch: {epoch['epoch']}, Slot: {epoch['slotIndex']}/{epoch['slotsInEpoch']}")

def get_sol_price():
    url = "https://api.coingecko.com/api/v3/simple/price?ids=solana&vs_currencies=usd"
    with urllib.request.urlopen(url) as r:
        return json.loads(r.read())["solana"]["usd"]
price = get_sol_price()
bal = get_sol_balance(addr)
print(f"Portfolio: ${bal * price:.2f} USD")

# Install
sh -c "$(curl -sSfL https://release.solana.com/stable/install)"
 
# Balance
solana balance WALLET_ADDRESS
 
# Transaction history
solana transaction-history WALLET_ADDRESS --limit 10
 
# Set network
solana config set --url mainnet-beta

# Helius (free tier available)
RPC = "https://mainnet.helius-rpc.com/?api-key=YOUR_KEY"