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Stelar Signals

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Crypto market signals and portfolio telemetry. 6 tools pay-per-call in USDC, no API key.

Source code Website Documentation

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http stelar-signals 'https://api.stelardigital.com/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "stelar-signals": {
            "type": "http",
            "url": "https://api.stelardigital.com/mcp"
        }
    }
}
NPM package stelar-signals-mcp
Claude Code 
claude mcp add stelar-signals -e 'RAPIDAPI_KEY=<your rapidapi_key>' -- npx -y stelar-signals-mcp@1.1.3
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "stelar-signals": {
            "command": "npx",
            "args": [
                "-y",
                "stelar-signals-mcp@1.1.3"
            ],
            "env": {
                "RAPIDAPI_KEY": "<your rapidapi_key>"
            }
        }
    }
}

Environment variables

  • RAPIDAPI_KEY secret Optional. Needed only for the 6 free-tier tools. The 6 x402 tools require no key.

Documentation

From the project's README on GitHub, refreshed weekly. Links open on GitHub.

Contents
  1. Stelar Signals MCP
  2. Install
  3. Paid tools — x402, USDC on Base, no key required
  4. Free-tier tools — these DO need a RapidAPI key
  5. Discovery
  6. Honest limits
  7. About

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

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

Frequently asked questions

What is Stelar Signals?

Crypto market signals and portfolio telemetry. 6 tools pay-per-call in USDC, no API key.

How do I install Stelar Signals?

It runs as a remote server. In Claude Code: claude mcp add --transport http stelar-signals 'https://api.stelardigital.com/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does Stelar Signals need an API key?

Yes. It expects RAPIDAPI_KEY, which you set in its configuration.

Is Stelar Signals open source?

Yes. Its code is on GitHub under the MIT license.

Who maintains Stelar Signals?

It is published by StelarDigital. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.