How to Use the Ankr (Web3 Node API) MCP in Pydantic AI

Q: How does the server handle Solana transactions in Pydantic AI?

It exposes tools like sendTransaction and getLatestBlockhash. Your agent builds, validates, and submits Solana transactions using native Python types.

Build type-safe Web3 agents with Pydantic AI that validate blockchain data against strict schemas at runtime.

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Connect Ankr (Web3 Node API) MCP to Pydantic AI

Create your Vinkius account to connect Ankr (Web3 Node API) to Pydantic AI 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 Pydantic AI

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Validate multi-chain balances with Pydantic AI

The `eth_getBalance` tool retrieves the exact native balance of any Ethereum address. Pydantic AI immediately validates this numeric value against your strict Python models to prevent type mismatches. For ERC-20 tokens, `ankr_getAccountBalance` returns structured list data. If the API format changes, your agent raises a validation error instantly instead of passing corrupt data to downstream functions.

Simulate transactions safely using this MCP Server

The `eth_simulateV1` tool runs complex transaction simulations before you commit gas. Your agent parses the simulation results into strongly-typed Pydantic schemas to verify state changes. Use `simulateTransaction` for Solana-based workflows. This ensures your code catches execution failures and invalid instructions before they ever touch the live mainnet.

Fetch verified token market data and transfer logs

The `ankr_getTokenPrice` tool returns the current USD price of any supported token. Your agent uses this to calculate portfolio values with guaranteed runtime type safety. Combine this with `ankr_getTokenTransfers` to audit historical movements. The structured outputs map directly to your Python data classes, making financial reporting code clean and predictable.

Setup guide

Set up Ankr (Web3 Node API) MCP in Pydantic AI

Prerequisites

Python 3.10+ installed
pydantic-ai-slim[fastmcp] package
Active Vinkius subscription with a valid endpoint token

1

Install Pydantic AI with FastMCP
Run pip install "pydantic-ai-slim[fastmcp]". The FastMCP toolset replaces the deprecated MCPServerHTTP class with full protocol support.
2

Configure the FastMCPToolset
Pass a JSON-style config dict to FastMCPToolset with your Vinkius URL. Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. Supports Streamable HTTP, SSE, and Stdio transports.
3

Create and run your agent
Pass the toolset to Agent(toolsets=[toolset]) and call agent.run(). Swap openai:gpt-4o for any supported model — Anthropic, Google, Mistral, or Groq.

agent.py

from pydantic_ai import Agent
from pydantic_ai.toolsets.fastmcp import FastMCPToolset

toolset = FastMCPToolset({
    "mcpServers": {
        "ankr-web3-node-api-mcp": {
            "url": "https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp"
        }
    }
})

agent = Agent(
    "openai:gpt-4o",
    toolsets=[toolset],
    system_prompt="You have access to Ankr (Web3 Node API) tools.",
)

result = await agent.run("List recent Ankr (Web3 Node API) transactions")
print(result.output)

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Common questions about Ankr (Web3 Node API) MCP in Pydantic AI

Use the unified toolset class pointing to your Vinkius MCP Server URL. Pass it into the agent constructor's toolsets argument to enable type-safe RPC calls.

The framework raises a validation error immediately. This prevents your agent from executing logic based on malformed blockchain payloads or missing fields.

Yes, Pydantic AI is model-agnostic. You pair these Web3 tools with local models or commercial APIs while maintaining strict type validation on all outputs.

It exposes tools like `sendTransaction` and `getLatestBlockhash`. Your agent builds, validates, and submits Solana transactions using native Python types.

The MCP server processes wallet addresses, transaction signatures, and contract storage states. Vinkius runs the server in an ephemeral sandbox, securing your RPC queries and preventing any local data leaks.

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