How to Use the BlockCypher (Multi-chain Blockchain Developer API) MCP in LangChain

Q: Can LangChain agents handle transaction signing with this BlockCypher (Multi-chain Blockchain Developer API) server?

No, signing happens locally. The agent uses newtransaction to generate the raw hex, which your local code signs, and then the agent broadcasts it using sendtransaction.

Build multi-chain pipelines in LangChain that query blockchain states and broadcast signed transactions without manual API glue.

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Connect BlockCypher (Multi-chain Blockchain Developer API) MCP to LangChain

Create your Vinkius account to connect BlockCypher (Multi-chain Blockchain Developer API) to LangChain and route execution through our secure gateway. The platform manages server hosting, runtime updates, and security layers. Configuration requires no manual server provisioning.

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Setup BlockCypher (Multi-chain Blockchain Developer API) with LangChain

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Multi-Chain Execution in LangChain

This BlockCypher MCP Server exposes 15 tools to interact directly with Bitcoin, Ethereum, and testnets. Your LangChain agent uses `get_blockchain` to check network congestion, then routes the output straight into `new_transaction` to build a raw transaction skeleton. You get a deterministic sequence where data flows from one block query directly into transaction construction. Because every tool execution is a link in your LangGraph chain, you can track the exact latency of calls like `get_address_balance` using LangSmith. The agent handles the conditional logic, deciding whether to call `fund_bcy_test_address` based on the balance it just read.

Smart Contract Deployments and Execution

The `create_eth_contract` tool allows your agent to deploy compiled Solidity code directly to the network. LangChain handles the state transitions, feeding contract addresses into `call_eth_contract_method` to execute functions immediately after deployment. You don't write custom Web3 injection code. The agent reads the ABI, formats the parameters, and invokes the contract. If a transaction fails, the chain catches the error and queries `get_transaction` to inspect the receipt.

Real-Time Webhook Management

The `create_webhook` tool lets your LangChain pipeline register instant event listeners on the blockchain. Your agent sets up these triggers dynamically during run execution, matching specific wallet addresses generated via `generate_address`. This removes the need to poll the network constantly. Your chain initiates the webhook, and your backend handles the incoming payload, keeping your LangChain agent informed of transaction confirmations.

Setup guide

Set up BlockCypher (Multi-chain Blockchain Developer API) MCP in LangChain

Prerequisites

Python 3.10+ installed
langchain-mcp-adapters + langgraph packages
Active Vinkius subscription with a valid endpoint token

1

Install dependencies
Run pip install langchain-mcp-adapters langgraph langchain-openai. The MCP adapters package converts MCP tools into native LangChain BaseTool objects.
2

Connect via HTTP transport
Use MultiServerMCPClient with "transport": "http" pointing to your Vinkius endpoint. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com.
3

Create a ReAct agent
Pass the discovered tools to create_react_agent() from LangGraph. The agent automatically routes BlockCypher (Multi-chain Blockchain Developer API) tool calls through the MCP protocol.
4

Run with any LLM
Swap ChatOpenAI for ChatAnthropic, ChatGoogleGenerativeAI, or any LangChain-compatible model. The MCP tools work identically across all providers.

agent.py

from langchain_mcp_adapters.client import MultiServerMCPClient
from langgraph.prebuilt import create_react_agent
from langchain_openai import ChatOpenAI

async with MultiServerMCPClient({
    "blockcypher-multi-chain-blockchain-developer-api-mcp": {
        "transport": "http",
        "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp",
    }
}) as client:
    tools = client.get_tools()

    agent = create_react_agent(
        ChatOpenAI(model="gpt-4o"),
        tools,
    )
    result = await agent.ainvoke({
        "messages": "List recent BlockCypher (Multi-chain Blockchain Developer API) transactions"
    })
    print(result["messages"][-1].content)

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Common questions about BlockCypher (Multi-chain Blockchain Developer API) MCP in LangChain

Install langchain-mcp-adapters and langgraph. Pass the Vinkius MCP endpoint to MultiServerMCPClient, grab the tools with get_tools(), and inject them directly into your agent constructor.

No, signing happens locally. The agent uses `new_transaction` to generate the raw hex, which your local code signs, and then the agent broadcasts it using `send_transaction`.

Yes. Because this runs as a standard MCP toolset, every invocation of `get_block_by_hash` or `get_address` is automatically tracked in LangSmith with full input and output payloads.

The agent inspects the tool schemas. It routes BTC requests to tools like `get_address` with the appropriate chain parameter and uses `call_eth_contract_method` specifically for Ethereum-compatible networks.

Vinkius runs this MCP Server in an isolated V8 sandbox. Your API token and transaction signatures never enter the LLM context or LangChain logs; they are injected securely at the sandbox edge to authorize tools like `create_eth_contract`.

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