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
claude mcp add stelar -- npx -y stelar-signals-mcp
Or in any MCP client config:
{
"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:
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
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.