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

Tool	Description	Parameters
`orbuc_stablecoin_mcap`	Historical daily total stablecoin market cap	`days`, `start_date`, `end_date`
`orbuc_stablecoin_latest`	Latest snapshot — all 13 coins with per-chain breakdown	—
`orbuc_stablecoin_coin`	Historical supply for a specific stablecoin	`symbol`, `days`, `start_date`, `end_date`
`orbuc_stablecoin_coin_latest`	Latest supply for one coin with chain breakdown	`symbol`
`orbuc_stablecoin_aggregate`	Daily aggregate by total, symbol, or chain	`level`, `start_date`, `end_date`
`orbuc_stablecoin_chains`	Supply distribution across chains	`days`

Bitcoin Institutional Holdings

Tool	Description	Parameters
`orbuc_btc_holdings_current`	Latest BTC held by institutions per segment	—
`orbuc_btc_holdings_segments`	Segment breakdown with confidence and sources	—
`orbuc_btc_holdings_daily`	Daily time series, optionally by segment	`segment`, `start_date`, `end_date`
`orbuc_btc_holdings_weekly`	Weekly aggregated holdings	`segment`
`orbuc_btc_health`	BTC tracker health status	—
`orbuc_stablecoin_health`	Stablecoin tracker health status	—

Quick Start

Claude.ai / Claude Desktop

Add as a custom MCP connector:

Code

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

VS Code / Cursor / Windsurf

Add to .vscode/mcp.json:

config.json

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

Claude Desktop Config

Add to claude_desktop_config.json:

config.json

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

Python (MCP SDK)

server.ts

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

bash

# 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

License

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

Orbuc README