Stelar Signals MCP

An MCP (Model Context Protocol) server that gives any MCP-compatible agent (Claude Code, Claude Desktop, Cursor, Windsurf, Codex …) live crypto market signals and portfolio telemetry.

Six of its tools are pay-per-call over x402 — no signup, no account, and no API key. Your agent pays cents in USDC on Base from its own wallet and gets the data back in the same request.

Install

Terminal

claude mcp add stelar -- npx -y stelar-signals-mcp

Or in any MCP client config:

config.json

{
  "mcpServers": {
    "stelar": { "command": "npx", "args": ["-y", "stelar-signals-mcp"] }
  }
}

The server starts and lists every tool with no environment variables set.

Paid tools — x402, USDC on Base, no key required

Tool	Price	What you get
`price`	$0.005	Current price, 24h and 7d change, bull/bear/neutral signal
`sentiment`	$0.005	Sentiment score (-1 to +1) and label, for text or an asset
`telemetry`	$0.005	Live telemetry of an AI-managed crypto portfolio — allocation, reconciled P&L, signal votes, human-approval trail
`risk`	$0.02	Volatility / drawdown risk regime — ATR% vs its 30-day p80 baseline, labeled low/med/high
`regime`	$0.03	Market regime (chop / uptrend / downtrend / high-volatility) plus a grid-trading suitability verdict
`gridparams`	$0.05	Grid count, spacing %, price band and per-grid allocation from live 24h market structure

These call https://api.stelardigital.com, which answers HTTP 402 with a payment challenge. Any x402-capable client settles it and retries automatically. Assets covered: SOL, BTC, ETH, XRP, DOGE, LTC, ADA, XLM.

These are live production endpoints backed by real market data — not demo stubs.

Free-tier tools — these DO need a RapidAPI key

crypto_regime, crypto_sentiment, pricecheck, token_risk, summarize, factcheck are served through RapidAPI. Set RAPIDAPI_KEY to use them:

Terminal

claude mcp add stelar -e RAPIDAPI_KEY=your-key -- npx -y stelar-signals-mcp

Without the key these six return a clear error; the six paid x402 tools above keep working, because they do not use RapidAPI at all.

Discovery

Code

GET https://api.stelardigital.com/catalog          endpoints, prices, parameters
GET https://api.stelardigital.com/.well-known/x402 x402 discovery manifest
GET https://api.stelardigital.com/openapi.json     OpenAPI 3.1 spec

A hosted streamable-HTTP MCP endpoint is also live at https://api.stelardigital.com/mcp.

Honest limits

Signals cover the eight majors listed above, not arbitrary tokens.
Paid tools need a funded wallet; without one they return HTTP 402 rather than data.
Every response carries generated_at; nothing is cached longer than a minute.

About

Built by Stelar Digital. One human. One AI. A whole company.

MIT licensed.