Koskamo

Proof of Custody MCP

An MCP server that provides independent scoring, incident registries, and data for Bitcoin custody platforms, ETFs, and stablecoins. It enables agents to query custody scores, compare platforms, check for failures, and retrieve source data for due diligence.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

Proof of Custody MCP logo, by Onramp BitcoinNo sign-inEndpoint checked 2026-10-26Operated by Onramp Bitcoin
MCP endpoint (Streamable HTTP)
https://proofofcustody.io/api/mcp
Vendor documentation

What you can do with it

  • Search independent custody scores for Bitcoin and crypto platforms
  • Compare custody platforms side by side on scores and architecture
  • Check the incident registry for major custody failures
  • Retrieve stablecoin supply data and x402 payment services
Tools advertised by the last live check:
  • search_custody_platforms
  • get_custody_platform
  • compare_custody_platforms
  • assess_custody_independence
  • list_custody_incidents
  • get_coldcard_incident_status
  • get_hardware_wallet_scores
  • get_etf_custody_concentration
  • find_source
  • whats_new
  • watch_counterparties
  • search_transcripts
  • get_stablecoin_supply
  • get_tokenized_assets
  • get_x402_services

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http proof-of-custody-mcp https://proofofcustody.io/api/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add proof-of-custody-mcp --url https://proofofcustody.io/api/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable proof-of-custody-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "proof-of-custody-mcp": {
      "url": "https://proofofcustody.io/api/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.
Cline configuration
{
  "mcpServers": {
    "proof-of-custody-mcp": {
      "type": "streamableHttp",
      "url": "https://proofofcustody.io/api/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start proof-of-custody-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "proof-of-custody-mcp": {
      "type": "http",
      "url": "https://proofofcustody.io/api/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http proof-of-custody-mcp https://proofofcustody.io/api/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "proof-of-custody-mcp": {
      "url": "https://proofofcustody.io/api/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "proof-of-custody-mcp": {
      "serverUrl": "https://proofofcustody.io/api/mcp"
    }
  }
}

Ground your agent in cited data

Proof of Custody MCP gives your agent tools. Koskamo gives it reviewed, cited facts to check its answers against. Add it as a second MCP server; public reads need no API key.

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Do you run Proof of Custody MCP?

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