How to Use the Ankr (Web3 Node API) MCP in OpenAI Agents SDK

Q: Does Ankr (Web3 Node API) support gas estimation with OpenAI Agents SDK?

Yes, the server includes ethestimateGas for this exact purpose. Your agent calculates the required gas before submitting a transaction to prevent out-of-gas failures.

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Connect Ankr (Web3 Node API) MCP to OpenAI Agents SDK

Create your Vinkius account to connect Ankr (Web3 Node API) to OpenAI Agents SDK 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 Ankr (Web3 Node API) with OpenAI Agents SDK

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Verify wallet balances and assets across chains

The `ankr_getAccountBalance` tool pulls live token balances directly from multiple blockchains into your agent's runtime. Your agent uses this to inspect wallet holdings instantly before triggering any conditional logic. By combining this with `ankr_getNFTsByOwner` and `ankr_getInteractions`, your system builds a complete profile of any address. This lets your OpenAI agents run compliance checks using this MCP Server without writing custom parsing scripts.

Run safe contract calls via the OpenAI Agents SDK

The `eth_call` tool executes read-only smart contract operations directly through the Ankr MCP Server. This allows your agent to query contract state without spending gas or modifying the state. When it's time to write data, the agent uses `eth_estimateGas` and `eth_sendRawTransaction`. OpenAI's guardrails intercept these calls, ensuring your agent never submits a transaction that exceeds your specified gas limit.

Fetch raw block data for real-time analysis

The `eth_getBlockByNumber` tool retrieves complete block details to feed your analytical agents. Your agent monitors chain activity by comparing block heights and verifying receipts. Use `eth_getTransactionReceipt` alongside `eth_getLogs` to track specific events. This setup feeds clean, structured log data directly into your OpenAI tracing dashboard for instant debugging.

Setup guide

Set up Ankr (Web3 Node API) MCP in OpenAI Agents SDK

Prerequisites

Python 3.10+ installed
openai-agents package (pip install openai-agents)
Active Vinkius subscription with a valid endpoint token

1

Install the SDK

Run pip install openai-agents to install the OpenAI Agents SDK. The MCP integration is built-in — no extra dependencies needed.
2

Connect via SSE transport

Use MCPServerSse with your Vinkius endpoint URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. The SDK auto-discovers all Ankr (Web3 Node API) tools at runtime.
3

Create your Agent

Pass the MCP to Agent(mcp_servers=[server]). The agent receives Ankr (Web3 Node API) tools as native definitions — JSON schemas resolve automatically.
4

Run the agent

Call Runner.run(agent, prompt) to execute. The agent invokes the appropriate Ankr (Web3 Node API) tools and returns structured results. Copy the full example on the right to get started.

agent.py

import asyncio
from agents import Agent, Runner
from agents.mcp import MCPServerSse

async def main():
    async with MCPServerSse(
        url="https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
    ) as server:
        agent = Agent(
            name="Ankr (Web3 Node API) Agent",
            instructions="You have access to Ankr (Web3 Node API) tools.",
            mcp_servers=[server],
        )
        result = await Runner.run(agent, "List recent transactions")
        print(result.final_output)

asyncio.run(main())

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Common questions about Ankr (Web3 Node API) MCP in OpenAI Agents SDK

Install the SDK with pip and pass the Vinkius HTTP endpoint to the streamable server constructor. Your agents will auto-discover all 32 tools instantly.

Yes, you configure this at the agent level by filtering the auto-discovered tools list. If you only want read access, you expose tools like `eth_call` and block writing tools.

Yes, the server includes `eth_estimateGas` for this exact purpose. Your agent calculates the required gas before submitting a transaction to prevent out-of-gas failures.

The server routes queries to the correct chain based on your parameters. Tools like `ankr_getAccountBalance` handle the multi-chain lookup internally, returning unified data to your agent.

This MCP server processes blockchain addresses, transaction hashes, and smart contract payloads. Vinkius runs the server in an ephemeral, zero-trust sandbox, meaning your private keys and query parameters are never logged or stored.

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