Odel
MCP server: One MCP server.

Blockchain Fees

@cryptoapis-ioRun by its publisher: served from their own domain, namespace checked by the registry.MCP server · External

MCP server for fee recommendations and gas estimation on EVM, UTXO, XRP, Tezos, Solana

v0.5.1MITTypeScript
Freeno charge per call
How to install

Runs on your machine from its package; the steps are below.

What it does

  1. Reads
  2. Writes
  3. High impact

At most: only reads or looks up information.

What it costs

Free

Odel charges nothing per call. The publisher may charge for its own service.

Runs locally over stdio

This server isn't hosted — your MCP client launches it from a package registry. Use one of the commands below, or drop the config into your client (e.g. Claude Desktop).

npm@cryptoapis-io/mcp-blockchain-feesv0.5.1

Run

npx -y @cryptoapis-io/mcp-blockchain-fees

MCP client config

{
  "mcpServers": {
    "blockchain-fees": {
      "command": "npx",
      "args": [
        "-y",
        "@cryptoapis-io/mcp-blockchain-fees"
      ]
    }
  }
}
README5 min read

@cryptoapis-io/mcp-blockchain-fees

MCP server for Crypto APIs Blockchain Fees product. Fee recommendations and gas estimates for UTXO, EVM, XRP, Tezos, and Solana blockchains.

API Version: Compatible with Crypto APIs version 2024-12-12

Features

  • UTXO fee recommendations and smart fee estimation (Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash)
  • EVM fee recommendations, EIP-1559 fees, and gas estimation for transfers and contract calls
  • XRP fee recommendations
  • Tezos fee recommendations and fee estimation for native XTZ, FA1.2, and FA2 transfers
  • Solana fee recommendations and compute-unit estimation for native SOL transfers, SPL token transfers, and arbitrary program invocations

Prerequisites

Installation

bash
npm install @cryptoapis-io/mcp-blockchain-fees

Or install all Crypto APIs MCP servers: npm install @cryptoapis-io/mcp

Usage

bash
# Run with API key
npx @cryptoapis-io/mcp-blockchain-fees --api-key YOUR_API_KEY

# Or use environment variable
export CRYPTOAPIS_API_KEY=YOUR_API_KEY
npx @cryptoapis-io/mcp-blockchain-fees

# HTTP transport (listens on 127.0.0.1; see "Exposing the server beyond localhost")
npx @cryptoapis-io/mcp-blockchain-fees --transport http --port 3000 --api-key YOUR_API_KEY

Claude Desktop

Add to your Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS, %APPDATA%\Claude\claude_desktop_config.json on Windows):

json
{
  "mcpServers": {
    "cryptoapis-blockchain-fees": {
      "command": "npx",
      "args": ["-y", "@cryptoapis-io/mcp-blockchain-fees"],
      "env": {
        "CRYPTOAPIS_API_KEY": "your_api_key_here"
      }
    }
  }
}

Cursor

Add to .cursor/mcp.json (project) or ~/.cursor/mcp.json (global):

json
{
  "mcpServers": {
    "cryptoapis-blockchain-fees": {
      "command": "npx",
      "args": ["-y", "@cryptoapis-io/mcp-blockchain-fees"],
      "env": {
        "CRYPTOAPIS_API_KEY": "your_api_key_here"
      }
    }
  }
}

MCP Inspector

bash
npx @modelcontextprotocol/inspector npx @cryptoapis-io/mcp-blockchain-fees --api-key YOUR_API_KEY

n8n

  1. Start the server in HTTP mode:
    bash
    npx @cryptoapis-io/mcp-blockchain-fees --transport http --port 3000 --api-key YOUR_API_KEY
  2. In your n8n workflow, add an AI Agent node
  3. Under Tools, add an MCP Client Tool and set the URL to http://localhost:3000/mcp

n8n in Docker: localhost inside the container is not your machine. Start the server with --host 0.0.0.0 and MCP_AUTH_TOKEN set (see Exposing the server beyond localhost), use http://host.docker.internal:3000/mcp as the URL, and add an Authorization: Bearer <token> header to the MCP Client Tool credential.

All servers default to port 3000. Use --port to assign different ports when running multiple servers.

Available Tools

blockchain_fees_utxo

Fee recommendations for UTXO blockchains (Bitcoin, Bitcoin Cash, Litecoin, Dogecoin, Dash, Zcash).

ActionDescription
get-fee-recommendationsGet fee recommendations (slow, standard, fast)
estimate-transaction-smart-feeEstimate smart fee for a target confirmation time

blockchain_fees_evm

Fee recommendations and gas estimation for EVM blockchains.

ActionDescription
get-fee-recommendationsGet fee recommendations (slow, standard, fast)
get-eip-1559-fee-recommendationsGet EIP-1559 fee recommendations (base fee, priority fee)
estimate-native-coin-transfer-gasEstimate gas for native coin transfer
estimate-token-transfer-gasEstimate gas for token transfer
estimate-contract-interaction-gasEstimate gas for contract interaction

blockchain_fees_xrp

Fee recommendations for XRP (mainnet, testnet).

ActionDescription
get-fee-recommendationsGet XRP fee recommendations

blockchain_fees_tezos

Fee recommendations and fee estimation for Tezos (mainnet, shadownet).

ActionDescription
get-fee-recommendationsGet current minimal fee/cost rates from the mempool
estimate-transferEstimate the fee for a native XTZ transfer
estimate-fa12-transferEstimate the fee for an FA1.2 token transfer
estimate-fa2-transferEstimate the fee for an FA2 token transfer

blockchain_fees_solana

Fee recommendations and compute-unit estimation for Solana (mainnet, devnet).

ActionDescription
get-fee-recommendationsGet current priority fee recommendations from the mempool
estimate-native-coin-transfer-compute-unitsEstimate compute units for a native SOL transfer
estimate-token-transfer-compute-unitsEstimate compute units for an SPL token transfer
estimate-program-invocation-compute-unitsEstimate compute units for an arbitrary program instruction call

CLI Arguments

ArgumentDescriptionDefault
--api-keyCrypto APIs API keyCRYPTOAPIS_API_KEY env var
--transportTransport type: stdio or httpstdio
--hostHTTP host (use 0.0.0.0 to accept remote connections — requires an auth token with --api-key)127.0.0.1
--auth-tokenBearer token callers must send (Authorization: Bearer <token>); prefer the MCP_AUTH_TOKEN env varMCP_AUTH_TOKEN env var
--allowed-hostsComma-separated Host header allowlist for non-loopback binds—
--portHTTP port3000
--pathHTTP path/mcp
--statelessEnable stateless HTTP modefalse

HTTP API Key Modes

When using HTTP transport, the server supports two API key modes:

  • With --api-key: The key is used for all requests. x-api-key request headers are ignored.
  • Without --api-key: Each request must include an x-api-key header with a valid Crypto APIs key. This enables hosting a public server where each user provides their own key.
bash
# Per-request key mode (multi-tenant)
npx @cryptoapis-io/mcp-blockchain-fees --transport http --port 3000
# Clients send x-api-key header with each request

Exposing the server beyond localhost

HTTP mode listens on 127.0.0.1 by default, so only processes on the same machine can reach it. To accept connections from other machines or containers, bind explicitly and protect the port:

bash
# Startup-key mode: callers must present the token (the server refuses to start without one)
export MCP_AUTH_TOKEN=$(openssl rand -hex 32)
npx @cryptoapis-io/mcp-blockchain-fees --transport http --host 0.0.0.0 --port 3000 --api-key YOUR_API_KEY \
  --allowed-hosts mcp.internal.example
# Clients send: Authorization: Bearer $MCP_AUTH_TOKEN

# Per-request key mode: no startup key, every request must carry the caller's own x-api-key
npx @cryptoapis-io/mcp-blockchain-fees --transport http --host 0.0.0.0 --port 3000

--allowed-hosts restricts the Host header (DNS rebinding protection) when not bound to loopback. Prefer MCP_AUTH_TOKEN over --auth-token: command-line arguments are visible in the process list.

Stdio transport always requires an API key at startup.

Important: API Key Required

Warning: Making requests without a valid API key — or with an incorrect one — may result in your IP being banned from the Crypto APIs ecosystem. Always ensure a valid API key is configured before starting any server.

Remote MCP Server

Crypto APIs provides an official remote MCP server with all tools available via HTTP Streamable transport at https://ai.cryptoapis.io/mcp. Pass your API key via the x-api-key header — no installation required.

License

MIT

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