Helius

Address it

const helius = await create("helius"); // HELIUS_API_KEY required
await helius.getTokenBalances("…", "solana", { nonZeroOnly: true });

What it reads

Enhanced Transactions v0 for history and one transaction, and DAS searchAssets over JSON-RPC on the RPC root for token holdings.

Gotchas

• There's no REST balance endpoint, so getBalance throws UnsupportedOperationError and capabilities.balances is false. The registry knows, and a balance read on Solana never lands here.
• The key travels as the api-key query parameter. sanitizeUrl redacts it from every error message and URL, and Helius is the reason that redaction exists.
• DAS answers over JSON-RPC, so a failure arrives as error inside a 200 response and the provider reads it there. Pages hold a thousand assets and the walk stops after twenty pages.

Where it lives

src/providers/helius.ts.