Rainfall DevKit SDK

Official TypeScript SDK for the Rainfall platform — 200+ production-grade AI tools in one secure API key.

Built to power real workflows: RAG pipelines, multi-node orchestration (better than n8n in my opinion), document intelligence, web research, financial analysis, and more.

Pricing & Access

This is not a free tool.
The Rainfall backend runs real infrastructure (LLMs, embeddings, search engines, secure edge nodes, etc.), so we charge a fair price.

• Indie Tier: $9/month — 60 requests per minute + usage credits (metered overages coming soon)
• Higher tiers and prepaid credit packs available soon

Your API key gives you immediate access after purchase. No hidden fees for the core tools.

Quick Start

npm install @rainfall-devkit/sdk

import { Rainfall } from '@rainfall-devkit/sdk';

const rainfall = new Rainfall({
  apiKey: process.env.RAINFALL_API_KEY!,     // from your purchase
  // subscriberId optional for some advanced flows
});

const result = await rainfall.web.search("latest AI chip market news");
console.log(result);

Or use the CLI:

rainfall auth login <your-api-key>
rainfall tools list
rainfall run exa-web-search -p '{"query": "something cool"}'

Head to Rainfall Studio for documentation and more - and you can run the tools there directly once you have your API key.

Features

• Integrations — GitHub, Notion, Linear, Slack, Figma, Stripe (same nodes that power our own purchase flows)
• Memory & Knowledge — Keyword + vector search (Jina embeddings), entity relations
• Web Research — Exa, Perplexity, Groq-powered compound mini
• AI Tools — OCR on PDFs/images (Mistral), vision, full OpenAI-compatible /chat/completions endpoint, local → Rainfall tool chaining
• Data Processing — CSV/JSON handling, DuckDB, document conversion (PDF → markdown/text/CSV), similarity search
• Financial Tools — Finviz quotes, SEC XBRL (10-Qs), Monte Carlo simulations
• Developer Experience — Full TypeScript, automatic retries, clear error types (RateLimitError, AuthenticationError, etc.), MCP support for Claude/Cursor/Windsurf/etc.
• Distributed Execution — Secure edge nodes, MCP proxy hub, job queuing across machines

Some tools (e.g. certain LLM calls) require your own provider keys for cost control or privacy — the SDK makes layering them trivial.

Note from Fall

Hey, I’m Fall — this SDK contains the exact tools I use daily to run my own company (Harmonic, Rainfall itself, etc.).
I built it because I got tired of gluing together 17 different services with brittle scripts.

If something doesn’t work as documented, or a tool you need is missing, email me at [email protected]. I promise I’ll fix it fast — this is how I eat, so I take it seriously.

We’re just getting started. Usage-based metering, higher tiers, desktop app, and on-prem options are already in the pipeline.

Thanks for betting on us.

— Fall