helius

Use the Helius DAS API getAssetsByOwner method with the wallet address and displayOptions to include collection metadata. Filter out FungibleToken and FungibleAsset interfaces to return only NFTs, and paginate with page or cursor parameters for large wallets.

Call getPriorityFeeEstimate with your transaction's account keys and a priority level such as HIGH. Then add a setComputeUnitPrice instruction with the returned microLamports value to your transaction before signing and sending.

Webhooks push parsed events to your HTTP endpoint for server-side monitoring without maintaining a connection. WebSockets provide lower-latency streaming subscriptions for accounts, logs, and signatures, with Enhanced WebSockets on Atlas infrastructure offering roughly 1.5-2x faster delivery.

Yes, Helius supports compressed NFTs through the DAS API methods getAssetProof and getAssetProofBatch for merkle proofs. The helius.zk namespace also provides compressed account, token balance, and validity proof methods for Light Protocol integration.

A 429 error means you exceeded your plan's request rate or credit allocation. Implement exponential backoff retries, batch requests with methods like getAssetBatch, cache frequent queries, or upgrade your plan in the Helius dashboard.

The free plan includes 500,000 credits per month, standard RPC access at roughly 10 requests per second, and 2 webhooks. Standard RPC calls cost 1 credit each, while DAS API calls cost 1-10 credits depending on the method.