helius.dev

# Helius

> Helius is Solana's leading infrastructure provider and developer platform. From high-performance RPC nodes and transaction sending (Sender) to gRPC streaming (LaserStream), webhooks, and digital asset APIs — Helius powers teams like Phantom, Jupiter, DFlow, Coinbase, and Bitwise.

This file is a directory. Each section below has its own llms.txt with detailed product info, examples, and use cases. Agents reading top-down can scope their consumption to the section they need.

## Section Indexes

- [Full agent context](https://www.helius.dev/llms-full.txt) — every product page, use case, signup flow, and the docs index inlined in one file for single-fetch ingestion
- [API catalog](https://www.helius.dev/api/llms.txt) — every Helius API surface with its OpenAPI spec and docs URL
- [Documentation](https://www.helius.dev/docs/llms.txt) — full developer docs and API reference
- [Use cases](https://www.helius.dev/use-case/llms.txt) — DeFi, exchanges, wallets, trading, fintech
- [Blog](https://www.helius.dev/blog/llms.txt) — research, tutorials, ecosystem updates
- [Staking](https://www.helius.dev/staking/llms.txt) — validator comparison and reward calculator

## Agent Surfaces

- [AGENTS.md](https://www.helius.dev/AGENTS.md) — agent onboarding doc
- [auth.md](https://www.helius.dev/auth.md) — authentication ceremony (API-key model, register/claim/revoke URIs)
- [CLI reference](https://www.helius.dev/cli.md) — full helius-cli command catalog and exit-code contract
- [Agent signup (Markdown)](https://www.helius.dev/api/agents.md) — programmatic API key acquisition
- [Agent signup (JSON)](https://www.helius.dev/api/agents.json) — machine-readable signup spec
- [Agent mode JSON](https://www.helius.dev/api/agent-mode) — structured product summary at one URL
- [MCP server card](https://www.helius.dev/.well-known/mcp/server-card.json) — MCP tool inventory and install metadata
- [A2A agent card](https://www.helius.dev/.well-known/agent-card.json) — A2A protocol manifest
- [OpenAPI catalog](https://www.helius.dev/openapi.json) — merged API spec across all surfaces
- [API catalog (RFC 9727)](https://www.helius.dev/.well-known/api-catalog) — discovery linkset

## Quick Install

- MCP server: `npx helius-mcp@latest`
- CLI: `npm install -g helius-cli` (also `npx helius-cli`)
- TypeScript SDK: `npm install helius-sdk`
- Rust SDK: `cargo add helius` ([crates.io](https://crates.io/crates/helius), [docs.rs](https://docs.rs/helius))
- API key (interactive): https://dashboard.helius.dev
- API key (programmatic): `helius signup --json` — 1 USDC on Solana mainnet
- Claude Code plugin: `/plugin marketplace add helius-labs/core-ai && /plugin install helius@helius-labs`

## Constraints

- **Authentication:** All Helius API endpoints require an API key passed as the `api-key` query parameter (e.g. `https://mainnet.helius-rpc.com/?api-key=YOUR_KEY`). Obtain one at https://dashboard.helius.dev or programmatically via `helius signup --json`.
- **Networks:** Solana mainnet (`mainnet.helius-rpc.com`) and devnet (`devnet.helius-rpc.com`) are supported across our RPC, API, and data streaming surfaces. Sender has 7 regional endpoints (`slc-`, `ewr-`, `lon-`, `fra-`, `ams-`, `sg-`, `tyo-` prefixes on `sender.helius-rpc.com`); LaserStream gRPC has its own 9-region footprint (Sender's 7 cities plus LAX and PITT — see https://www.helius.dev/laserstream for hostnames).
- **Agent signup is mainnet-only.** The autonomous `helius signup --json` flow requires a 1 USDC payment on Solana mainnet plus ~0.001 SOL for transaction fees. There is no devnet signup flow; once you have a key it works on both networks.
- **Rate limits vary by plan.** 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. Full per-feature table: https://www.helius.dev/pricing.md.
- **MCP transport:** stdio only, distributed via npm (`npx helius-mcp@latest`). No hosted HTTP/SSE variant — see the [server card](https://www.helius.dev/.well-known/mcp/server-card.json) for the tool inventory and required `HELIUS_API_KEY` environment variable.
- **SLA:** 99.99% uptime. Live status at https://helius.statuspage.io/. Support response time scales with plan — Free: community, Developer: 24h, Business: 12h, Professional: 8h (+ Telegram + Slack).