helius-api

Helius API — Enhanced Solana RPC

Helius extends standard Solana RPC with parsed transaction history, a unified Digital Asset Standard (DAS) API, webhooks, and priority fee estimation. Essential for wallet analysis, token metadata, and transaction monitoring.

Quick Start

1. Get an API Key

Sign up at dashboard.helius.dev — free tier available (1M credits/mo, no card required).

export HELIUS_API_KEY="your-api-key"

2. Install Dependencies

uv pip install httpx python-dotenv

3. Two Base URLs

Helius uses different base URLs depending on the API:

API	Base URL	Protocol
RPC / DAS / Priority Fees	https://mainnet.helius-rpc.com/?api-key=KEY	JSON-RPC 2.0
Enhanced Transactions / Webhooks	https://api-mainnet.helius-rpc.com/v0/...?api-key=KEY	REST

DAS API (Digital Asset Standard)

Unified interface for querying all Solana digital assets — fungible tokens, NFTs, compressed NFTs, Token-2022.

Get Asset Metadata

import httpx, os

API_KEY = os.environ["HELIUS_API_KEY"]
RPC_URL = f"https://mainnet.helius-rpc.com/?api-key={API_KEY}"

resp = httpx.post(RPC_URL, json={
    "jsonrpc": "2.0", "id": 1,
    "method": "getAsset",
    "params": {
        "id": "So11111111111111111111111111111111111111112",  # wSOL
        "options": {"showFungible": True}
    }
})
asset = resp.json()["result"]
# asset.content.metadata.name, asset.token_info.decimals, etc.

Get All Assets for a Wallet

resp = httpx.post(RPC_URL, json={
    "jsonrpc": "2.0", "id": 1,
    "method": "getAssetsByOwner",
    "params": {
        "ownerAddress": "WALLET_ADDRESS",
        "page": 1,
        "limit": 100,
        "displayOptions": {
            "showFungible": True,
            "showNativeBalance": True,
            "showZeroBalance": False,
        }
    }
})
assets = resp.json()["result"]["items"]

Search Assets with Filters

resp = httpx.post(RPC_URL, json={
    "jsonrpc": "2.0", "id": 1,
    "method": "searchAssets",
    "params": {
        "ownerAddress": "WALLET_ADDRESS",
        "tokenType": "fungible",      # fungible | nonFungible | all
        "page": 1,
        "limit": 50,
    }
})