Add Meridian — smart money signals API with MCP server

[himraven]

Add Meridian to the Market Data & Data Sources section.

What it provides:

• US Congress stock trading (STOCK Act disclosures)
• Dark pool anomalies (FINRA off-exchange data)
• SEC insider trading (Form 4)
• 13F institutional holdings (Berkshire, Bridgewater, Citadel, Soros, etc.)
• ARK Invest trades
• Superinvestor portfolio changes
• Crypto derivatives, on-chain analytics, ETF flows
• Multi-source confluence signals
• Market regime detection

Developer features:

• 34 API tools, REST + MCP Server for AI agents
• OpenAPI spec with x402 pricing extensions
• llms.txt for LLM discovery
• Free endpoints: market regime, crypto Fear & Greed
• Pay-per-call via x402 (USDC on Base L2) — no subscriptions needed

[wilsonfreitas]

Thanks for the contribution! This looks like a valuable service. However, there are a few issues to address:

1. Wrong section — Meridian is a commercial/proprietary service and should be placed under "## Commercial & Proprietary Services" instead of "Market Data & Data Sources". Per our contributing guidelines, commercial and proprietary projects go in their own section.

2. Multiple sentences — The description currently has three sentences but should be condensed to one concise sentence:

   • Current: "Smart money intelligence API — Congress trades... REST + MCP Server... Supports x402 micropayments."
   • Suggested: "Commercial smart money intelligence API for Congress trades, dark pools, insider trading, and crypto analytics with REST + MCP Server."

3. Language tag — For commercial SaaS services, a language tag may not be strictly required, but if you can specify the primary language (Python, JavaScript, etc.), that would be helpful.

Once you move the entry to the Commercial & Proprietary Services section and condense the description, this will be ready to merge!