MCP server for https://utilsforagents.com. It exposes eight paid utility tools via x402 plus one free feedback tool for feature requests and usability issues. Paid calls can be signed with either a Base EVM wallet or a Solana wallet.

Available Tools

Tool	Endpoint	Cost	Description
`json-diff`	`POST /v1/diff`	`$0.003`	Compare two JSON values and return a structured diff
`exif-summary`	`POST /v1/image/exif-summary`	`$0.003`	Extract EXIF metadata from a base64-encoded JPEG image
`scrub-metadata`	`POST /v1/image/scrub-metadata`	`$0.003`	Strip metadata from a base64-encoded JPEG or PNG image
`html-to-markdown`	`POST /v1/html/to-markdown`	`$0.003`	Convert an HTML string to clean Markdown
`fetch-markdown`	`POST /v1/html/fetch-markdown`	`$0.003`	Fetch a public URL and convert its HTML to Markdown
`fetch-content`	`POST /v1/text/fetch-content`	`$0.003`	Fetch a public URL and extract readable text
`url-metadata`	`POST /v1/url/metadata`	`$0.003`	Extract title, Open Graph, Twitter Card, favicon, feeds, and canonical metadata
`count-tokens`	`POST /v1/utilities/count-tokens`	`$0.003`	Count tokens for LLM input using exact BPE or estimation
`submit-feedback`	`POST /v1/feedback`	`free`	Submit short product or feature feedback without x402 payment

Payment Model

Paid utility tools use the x402 protocol with USDC. On a paid call, the MCP server signs the payment challenge using the configured wallet and retries automatically. The API currently advertises payment requirements on Base and Solana mainnet. The submit-feedback tool is free and does not trigger x402 payment.

Because this package includes paid tools, you must provide at least one payer key: EVM_PRIVATE_KEY or SOLANA_PRIVATE_KEY.

Quick Start

npx utilsforagents-mcp

Configuration

Variable	Required	Description
`EVM_PRIVATE_KEY`	Conditionally	EVM private key for a wallet holding USDC on Base. `0x` prefix is optional. Provide this or `SOLANA_PRIVATE_KEY`.
`SOLANA_PRIVATE_KEY`	Conditionally	Solana private key for a wallet holding USDC on Solana mainnet. Accepts base58, `0x` hex, or a JSON byte array such as the contents of `~/.config/solana/id.json`. Provide this or `EVM_PRIVATE_KEY`.
`RESOURCE_SERVER_URL`	No	Override the API base URL. Defaults to `https://utilsforagents.com`.

If both payer keys are present, the MCP server registers both payment schemes and lets the x402 client select the matching requirement returned by the API.

Claude Desktop

{
  "mcpServers": {
    "utilsforagents": {
      "command": "npx",
      "args": ["-y", "utilsforagents-mcp"],
      "env": {
        "EVM_PRIVATE_KEY": "your_wallet_private_key_here"
      }
    }
  }
}

Config path:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
Windows: %APPDATA%\\Claude\\claude_desktop_config.json
Linux: ~/.config/Claude/claude_desktop_config.json

To use Solana instead, replace EVM_PRIVATE_KEY with SOLANA_PRIVATE_KEY in the env block.

Wallet Setup

Create or dedicate a low-balance wallet on Base or Solana.
Fund it with a small amount of USDC on the matching network.
Export the private key in a supported format.
Set EVM_PRIVATE_KEY or SOLANA_PRIVATE_KEY before starting the MCP server.

Use a dedicated low-balance wallet for this package. Do not use a wallet that holds significant funds.

License

MIT

Keywords

mcp

mcp-server

model-context-protocol

x402

ai-agent

utilsforagents

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Package last updated on 21 Apr 2026

utilsforagents-mcp