Orbuc

Orbuc MCP Server

Remote MCP server providing AI agents with direct access to independent on-chain stablecoin market cap and Bitcoin institutional holdings data.

Endpoint: https://mcp.orbuc.io/mcp/orbuc

Protocol: MCP Streamable HTTP (JSON-RPC 2.0 over POST) Authentication: None required (open access) Transport: Stateless HTTP — no session persistence

---

What is Orbuc?

Orbuc is a digital asset research and investment firm. Orbuc produces its own data, tracking two core datasets independently — no third-party aggregators:

• Stablecoin Market Cap — direct on-chain totalSupply() RPC calls across 19 blockchain networks covering 13 stablecoins (USDT, USDC, USDS, DAI, USDe, FDUSD, PYUSD, USD1, BUIDL, BUIDL-I, crvUSD, GHO, FRAX). Updated daily at 03:00 UTC.

• Bitcoin Institutional Holdings — compiled from SEC EDGAR 8-K filings, on-chain Etherscan data, and verified public disclosures across 6 segments (ETF funds, public companies, governments, private companies, DeFi/wrapped BTC, exchanges & custodians). Updated daily at 02:00 UTC.

---

Available Tools (12)

Stablecoin Market Cap

Bitcoin Institutional Holdings

---

Quick Start

Claude.ai / Claude Desktop

Add as a custom MCP connector:

https://mcp.orbuc.io/mcp/orbuc

VS Code / Cursor / Windsurf

Add to .vscode/mcp.json:

{

"servers": { "orbuc": { "type": "http", "url": "https://mcp.orbuc.io/mcp/orbuc" } } }

Claude Desktop Config

Add to claude_desktop_config.json:

{

"mcpServers": { "orbuc": { "type": "url", "url": "https://mcp.orbuc.io/mcp/orbuc" } } }

Python (MCP SDK)

from mcp import ClientSession

from mcp.client.streamable_http import streamablehttp_client

async def query_orbuc(): async with streamablehttp_client("https://mcp.orbuc.io/mcp/orbuc") as (read, write, _): async with ClientSession(read, write) as session: await session.initialize() tools = await session.list_tools() print(f"{len(tools.tools)} tools available")

result = await session.call_tool("orbuc_btc_holdings_current", {}) print(result.content[0].text)

cURL

# Initialize

curl -X POST https://mcp.orbuc.io/mcp/orbuc \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":1,"method":"initialize","params":{"protocolVersion":"2024-11-05","capabilities":{},"clientInfo":{"name":"test","version":"1.0"}}}'

List tools

curl -X POST https://mcp.orbuc.io/mcp/orbuc \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":2,"method":"tools/list","params":{}}'

Call a tool

curl -X POST https://mcp.orbuc.io/mcp/orbuc \ -H "Content-Type: application/json" \ -d '{"jsonrpc":"2.0","id":3,"method":"tools/call","params":{"name":"orbuc_stablecoin_mcap","arguments":{"days":7}}}'

---

Example Queries

Once connected, ask your AI agent:

• *"What's the total stablecoin market cap today?"*
• *"Show me USDT supply broken down by chain"*
• *"How much BTC do public companies hold vs ETF funds?"*
• *"What's the daily change in ETF segment BTC holdings over the past two weeks?"*
• *"Compare USDC and USDT market share across Ethereum, Tron, and Solana"*
• *"Which BTC segments have high confidence data vs carry-forward estimates?"*

---

Data Coverage

Stablecoins

• Coins: USDT, USDC, USDS, DAI, USDe, FDUSD, PYUSD, USD1, BUIDL, BUIDL-I, crvUSD, GHO, FRAX
• Chains: Ethereum, Tron, Solana, Arbitrum, Base, BSC, Polygon, Avalanche, Optimism, TON, Near, Stellar, Sui, Celo, Gnosis, Linea, Mantle, zkSync, Algorand
• History from: August 2024
• Source: Direct on-chain totalSupply() RPC calls

Bitcoin Holdings

• Segments: public_companies, etf_funds, governments, private_companies, defi_other, exchanges_custodians
• History from: August 2025
• Sources: SEC EDGAR, Etherscan, event detection

---

x402 Payment Protocol

Orbuc also supports x402 micropayments for autonomous agent access via USDC on Base. The MCP server is currently free and open access — x402 pricing may be introduced in future.

Discovery file: https://orbuc.io/.well-known/x402.json

---

Links

• Website: orbuc.io
• MCP Endpoint: https://mcp.orbuc.io/mcp/orbuc
• Health Check: https://mcp.orbuc.io/mcp/health
• Contact: info@orbuc.io

---

License

Proprietary. Data provided by Orbuc Research. See data disclaimer for terms of use.