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,
    }
})

All DAS Methods

| Method | Purpose | Credits |

|--------|---------|---------|

| getAsset | Single asset metadata | 10 |

| getAssetBatch | Up to 1,000 assets | 10 |

| getAssetsByOwner | All assets for a wallet | 10 |

| getAssetsByGroup | Assets by collection | 10 |

| getAssetsByCreator | Assets by creator | 10 |

| getAssetsByAuthority | Assets by update authority | 10 |

| searchAssets | Multi-criteria filtered search | 10 |

| getAssetProof | Merkle proof (compressed NFTs) | 10 |

| getAssetProofBatch | Batch proofs | 10 |

| getSignaturesForAsset | Tx history for an asset | 10 |

| getNftEditions | All editions of a master | 10 |

| getTokenAccounts | Token accounts by mint/owner | 10 |

See references/das_api.md for complete field documentation.

Enhanced Transactions API

Transforms raw Solana transactions into human-readable structured data with categorized types and sources.

Parse a Transaction

API_URL = f"https://api-mainnet.helius-rpc.com/v0/transactions?api-key={API_KEY}"

resp = httpx.post(API_URL, json={
    "transactions": ["SIGNATURE_HERE"],
})
parsed = resp.json()[0]
# parsed["type"]        → "SWAP"
# parsed["source"]      → "JUPITER"
# parsed["description"] → "User swapped 1 SOL for 150 USDC on Jupiter"
# parsed["tokenTransfers"] → [{mint, amount, from, to}, ...]
# parsed["nativeTransfers"] → [{from, to, amount}, ...]

Get Parsed Transaction History for a Wallet

url = f"https://api-mainnet.helius-rpc.com/v0/addresses/{wallet}/transactions"
resp = httpx.get(url, params={
    "api-key": API_KEY,
    "limit": 50,
    "type": "SWAP",  # optional filter
})
history = resp.json()

Transaction Types (151+)

Key types for trading analysis:

| Type | Meaning |

|------|---------|

| SWAP | DEX swap |

| TRANSFER | Token/SOL transfer |

| ADD_LIQUIDITY / REMOVE_LIQUIDITY | LP operations |

| NFT_SALE / NFT_MINT / NFT_LISTING | NFT marketplace |

| STAKE_SOL / UNSTAKE_SOL | Staking |

| CREATE_ORDER / FILL_ORDER | Limit orders |

Transaction Sources (50+)

JUPITER, RAYDIUM, ORCA, MAGIC_EDEN, TENSOR, MARINADE, METEORA, PHANTOM, etc.

See references/enhanced_transactions.md for full type/source enums.

Webhooks

Real-time notifications for on-chain events — no polling required.

Create a Webhook

url = f"https://api-mainnet.helius-rpc.com/v0/webhooks?api-key={API_KEY}"
resp = httpx.post(url, json={
    "webhookURL": "https://your-server.com/helius-hook",
    "transactionTypes": ["SWAP", "TRANSFER"],
    "accountAddresses": ["WalletAddress1", "WalletAddress2"],
    "webhookType": "enhanced",
    "authHeader": "your-secret-token",
})
webhook_id = resp.json()["webhookID"]

Webhook Types

| Type | Data Format | Filtering |

|------|------------|-----------|

| enhanced | Parsed (like Enhanced Transactions API) | By transaction type + account |

| raw | Unprocessed transaction data | By account only (lower latency) |

| discord | Formatted messages to Discord channel | By transaction type + account |

Manage Webhooks

# List all
webhooks = httpx.get(f"{url}?api-key={API_KEY}").json()

# Update
httpx.put(f"{url}/{webhook_id}?api-key={API_KEY}", json={
    "webhookURL": "https://new-url.com/hook",
    "transactionTypes": ["SWAP"],
    "accountAddresses": ["NewWallet..."],
    "webhookType": "enhanced",
})

# Delete
httpx.delete(f"{url}/{webhook_id}?api-key={API_KEY}")

Up to 100,000 addresses per webhook (via API). 1 credit per event delivered.

Priority Fee API

Estimate optimal priority fees for transaction landing.

resp = httpx.post(RPC_URL, json={
    "jsonrpc": "2.0", "id": 1,
    "method": "getPriorityFeeEstimate",
    "params": [{
        "accountKeys": ["JUP6LkbZbjS1jKKwapdHNy74zcZ3tLUZoi5QNyVTaV4"],
        "options": {
            "includeAllPriorityFeeLevels": True,
            "recommended": True,
        }
    }]
})
fees = resp.json()["result"]
# fees["priorityFeeEstimate"]  → recommended fee (microlamports/CU)
# fees["priorityFeeLevels"]    → {min, low, medium, high, veryHigh, unsafeMax}

| Level | Percentile | Use Case |

|-------|-----------|----------|

| min | 0-20th | Non-urgent |

| low | 20-40th | Standard transfers |

| medium | 40-60th | DEX swaps (recommended default) |

| high | 60-80th | Time-sensitive |

| veryHigh | 80-95th | Critical timing |

| unsafeMax | 100th | Emergency only |

Fee in microlamports/CU. Total priority fee = microlamports/CU × compute units consumed.

Pricing & Rate Limits

| Plan | Price/mo | Credits | RPC req/s | DAS req/s |

|------|----------|---------|-----------|-----------|

| Free | $0 | 1M | 10 | 2 |

| Developer | $49 | 10M | 50 | 10 |

| Business | $499 | 100M | 200 | 50 |

| Professional | $999 | 200M | 500 | 100 |

Credit costs: Standard RPC = 1, DAS = 10, Enhanced Txns = 100, Webhooks = 1/event. Additional credits: $5/million.

Files

References

• references/das_api.md — Complete DAS API field reference and response schemas
• references/enhanced_transactions.md — Transaction types, sources, and response structure
• references/webhooks.md — Webhook setup, management, and event handling
• references/error_handling.md — Rate limits, error codes, and retry strategies

Scripts

• scripts/wallet_analysis.py — Fetch wallet assets and parsed transaction history
• scripts/token_lookup.py — Look up token metadata and holder information via DAS