# Helius API Catalog

> Solana RPC, DAS, Sender, Wallet, Webhooks, Priority Fee, ZK Compression, and Admin — every Helius API surface with its OpenAPI spec and docs URL.

This is a narrower agent-readable index than the site-wide https://www.helius.dev/llms.txt. For the merged OpenAPI catalog as a single JSON document, see https://www.helius.dev/openapi.json. For the RFC 9727 discovery linkset, see https://www.helius.dev/.well-known/api-catalog.

## Authentication

All Helius public API endpoints accept the API key as the `api-key` query parameter (e.g. `https://mainnet.helius-rpc.com/?api-key=YOUR_KEY`). Obtain a key at https://dashboard.helius.dev or programmatically via `helius signup --json` (CLI; 1 USDC on Solana mainnet).

## Networks

Mainnet (`mainnet.helius-rpc.com`) and devnet (`devnet.helius-rpc.com`) are supported across RPC, WebSocket, and LaserStream. Sender adds 7 regional endpoints (`slc-`, `ewr-`, `lon-`, `fra-`, `ams-`, `sg-`, `tyo-` prefixes on `sender.helius-rpc.com`).

## API Surfaces

### Solana RPC (HTTP) + Helius extensions

High-performance Solana RPC plus Helius extensions like getTransactionsForAddress and getTransfersForAddress for single-call address history.

- Endpoint: `https://mainnet.helius-rpc.com`
- OpenAPI spec: https://www.helius.dev/openapi/rpc-http.json
- Documentation: https://www.helius.dev/docs/rpc/overview

### Digital Asset Standard (DAS) API

Unified API for Solana NFTs, compressed NFTs, and tokens — metadata, ownership, Merkle proofs, and search.

- Endpoint: `https://mainnet.helius-rpc.com`
- OpenAPI spec: https://www.helius.dev/openapi/das-api.json
- Documentation: https://www.helius.dev/docs/das-api

### Helius Sender

Reliable transaction submission with Jito bundle support and staked-connection routes. 7 regional endpoints for low-latency global coverage.

- Endpoint: `https://sender.helius-rpc.com`
- OpenAPI spec: https://www.helius.dev/openapi/sender-api.json
- Documentation: https://www.helius.dev/docs/sending-transactions/sender

### Wallet API

REST endpoints for wallet-level portfolio views: USD balances, holdings, transfer history, funding source, and identity resolution.

- Endpoint: `https://api.helius.xyz/v1/wallet`
- OpenAPI spec: https://www.helius.dev/openapi/wallet-api.json
- Documentation: https://www.helius.dev/docs/wallet-api/overview

### Priority Fee API

Recommended priority fee estimates for reliable transaction landing under network load.

- Endpoint: `https://mainnet.helius-rpc.com`
- OpenAPI spec: https://www.helius.dev/openapi/priority-fee-api.json
- Documentation: https://www.helius.dev/docs/priority-fee-api

### ZK Compression Indexer

Compressed-account queries: state, balances, proofs, validity proofs, and compression history.

- Endpoint: `https://mainnet.helius-rpc.com`
- OpenAPI spec: https://www.helius.dev/openapi/zk-compression.json
- Documentation: https://www.helius.dev/docs/zk-compression/introduction

### Admin API

Project usage and billing data for Helius accounts (admin-authenticated).

- Endpoint: `https://admin-api.helius.xyz`
- OpenAPI spec: https://www.helius.dev/openapi/admin-api.json
- Documentation: https://www.helius.dev/docs/api-reference/admin

### Helius Webhooks

Create, update, list, and delete webhooks that push transaction and account events to an HTTPS endpoint.

- Endpoint: `https://api.helius.xyz/v0/webhooks`
- OpenAPI spec: https://www.helius.dev/openapi/webhooks.json
- Documentation: https://www.helius.dev/docs/webhooks

## SDKs

- **TypeScript** — [helius-sdk on npm](https://www.npmjs.com/package/helius-sdk) (`npm install helius-sdk`). Source: https://github.com/helius-labs/helius-sdk
- **Rust** — [helius on crates.io](https://crates.io/crates/helius) (`cargo add helius`). Source: https://github.com/helius-labs/helius-rust-sdk. Docs: https://docs.rs/helius

## Rate Limits

Vary by plan. Full per-feature table: https://www.helius.dev/pricing.md.

- Free: 10 RPS, 1 sendTransaction/sec, 1M credits/month
- Developer: 50 RPS, 5 sendTx/sec, 10M credits
- Business: 200 RPS, 50 sendTx/sec, 5 sendBundle/sec, 100M credits
- Professional: 500 RPS, 100 sendTx/sec, 5 sendBundle/sec, 200M credits