Helius

Helius is Solana's leading infrastructure provider. 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 — every product page, use case, signup flow, and the docs index inlined in one file for single-fetch ingestion
• API catalog — every Helius API surface with its OpenAPI spec and docs URL
• Documentation — full developer docs and API reference
• Use cases — DeFi, exchanges, wallets, trading, fintech
• Blog — research, tutorials, ecosystem updates
• Staking — validator comparison and reward calculator

Agent Surfaces

• AGENTS.md — agent onboarding doc
• auth.md — authentication ceremony (API-key model, register/claim/revoke URIs)
• CLI reference — full helius-cli command catalog and exit-code contract
• Agent signup (Markdown) — programmatic API key acquisition
• Agent signup (JSON) — machine-readable signup spec
• Agent mode JSON — structured product summary at one URL
• MCP server card — MCP tool inventory and install metadata
• A2A agent card — A2A protocol manifest
• OpenAPI catalog — merged API spec across all surfaces
• API catalog (RFC 9727) — 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, docs.rs)
• 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 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).