X402engine MCP

x402engine - mcp is an MCP server that provides HTTP 402 micropayment access to 38 pay - per - use APIs for AI agents, supporting payments in USDC and USDm, covering various services such as LLM inference, image generation, code execution, audio processing, and blockchain data.

Artificial intelligence chatbots Developer tools #Micropayment API #AI agent tool #Blockchain payment #Multi - chain support .JavaScript

rating : 2 points

downloads : 5.6K

update time : 2026-03-13

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What is x402engine-mcp?

x402engine-mcp is a Model Context Protocol (MCP) server that allows AI assistants (such as Claude) to access 38 different API services through micropayments. These services cover a variety of functions, from AI conversations and image generation to blockchain data queries. Different from traditional APIs, it uses the HTTP 402 payment protocol, and each call only requires a small fee (minimum $0.001), supporting payments in cryptocurrencies such as USDC and USDm.

How to use x402engine-mcp?

Using x402engine-mcp is very simple: First, configure the MCP server in Claude Desktop or Claude Code, and then the AI assistant can directly call various tools. The payment process is automated, and users do not need to manually handle cryptocurrency transactions. Developers can also use environment variables to configure the payment method or use the development mode to bypass payment.

Use cases

x402engine-mcp is particularly suitable for scenarios that require temporary access to multiple AI services, such as: image generation and text polishing during content creation, obtaining real-time cryptocurrency prices during data analysis, executing sandbox code tests during development, and scraping web content during research. Due to the pay-per-use model, it is very suitable for occasional use or scenarios that require flexible expansion.

Main features

AI conversation and inference

Supports multiple mainstream AI models, including GPT - 4o, Claude series, Gemini, DeepSeek, etc. The prices range from $0.002 to $0.09, meeting different budget and performance requirements.

AI image generation

Provides three levels of image generation services: fast, quality, and text optimization. The price is $0.015 - $0.12, suitable for various creative needs.

Sandbox code execution

Execute Python, JavaScript, Bash, R and other codes in a secure sandbox. Each call only costs $0.005, suitable for testing and data analysis.

Audio processing

Provides audio transcription ($0.10) and text - to - speech ($0.01 - $0.02) services, supporting two engines: OpenAI and ElevenLabs.

Cryptocurrency and market data

Obtain real - time cryptocurrency prices, market trends, historical charts and other data. The price is $0.001 - $0.003, and the data source is reliable.

Blockchain and wallet query

Query blockchain data such as wallet balance, transaction history, and token prices, and support simulated transaction execution. The price is $0.002 - $0.01.

Web tools

Web content scraping and screenshot functions. The price is $0.005 - $0.01, helping to obtain and analyze web information.

IPFS storage

Store data in the IPFS distributed network or retrieve data from IPFS. The price is $0.001 - $0.01, providing a decentralized storage solution.

Advantages

Pay - per - use model: No subscription required, pay according to actual usage, with transparent and controllable costs

Rich functions: 38 API services cover various fields such as AI, blockchain, and the Internet

Convenient payment: Supports multiple cryptocurrencies, and the payment process is automated

Easy integration: Seamlessly integrates with AI assistants such as Claude, and the configuration is simple

Affordable price: Starting from $0.001, suitable for individuals and small - scale use

Limitations

Requires cryptocurrency: Payment requires USDC or USDm, which is a threshold for users who are not familiar with cryptocurrencies

Network dependency: Requires a stable network connection for payment verification

Single - use cost: For high - frequency usage scenarios, pay - per - use may not be as cost - effective as a subscription

Technical threshold: Configuration requires certain technical knowledge and is not suitable for completely non - technical users

How to use

Installation and configuration

Configure the MCP server according to the AI assistant platform you are using. For Claude Desktop, you need to edit the configuration file; for Claude Code, use the command line to add it.

Set the payment method

Configure environment variables to set the payment. You can use the development bypass key (for testing) or set the pre - signed payment header (for the production environment).

Start using

Restart the AI assistant. Now you can directly let the AI call various tools, such as generating images, querying data, and executing code. The payment will be processed automatically.

View available services

Use the discover_services tool to view all available services and prices. This tool is free.

Usage examples

Content creation assistant

When writing a blog post, you need to generate relevant illustrations and optimize the text content.

Cryptocurrency research

Research the market performance and technical indicators of a cryptocurrency project.

Code debugging assistant

During the development process, you need to test the running results of a piece of code.

Multilingual content processing

Translate English content and convert it into a voice podcast.

Frequently Asked Questions

Do I need to recharge in advance?

Which payment networks are supported?

How do I know the cost of each call?

Is a free trial supported?

What should I do if the payment fails?

How is data privacy protected?

Related resources

x402engine gateway

The main API gateway and service endpoint

Service discovery document

The discovery document to view all available services and prices

GitHub repository

The source code and latest updates of the MCP server

x402 protocol official website

The official documentation and specifications of the HTTP 402 micropayment protocol

@x402/fetch package

A JavaScript library for automatically handling payments

🚀 x402engine-mcp

The MCP server for x402 Engine — enabling AI agents to access 38 pay-per-call APIs through HTTP 402 micropayments.

Payments can be made using USDC on Base, USDC on Solana, or USDm on MegaETH. The prices per call range from $0.001 to $0.12.

🚀 Quick Start

Claude Desktop

Add the following to your claude_desktop_config.json:

{
  "mcpServers": {
    "x402engine": {
      "command": "npx",
      "args": ["-y", "x402engine-mcp"],
      "env": {
        "X402_DEV_BYPASS": "your-dev-bypass-secret"
      }
    }
  }
}

Claude Code

claude mcp add x402engine -- npx -y x402engine-mcp

✨ Features

LLM Inference

Tool	Price	Description
`llm_chat`	$0.002 - $0.09	Chat completion with any supported model

Supported models: GPT-4o ($0.04), GPT-4o Mini ($0.003), OpenAI o1 ($0.03), Claude Opus 4.6 ($0.09), Claude Sonnet 4.5 ($0.06), Claude Haiku 4.5 ($0.02), Gemini 2.5 Pro ($0.035), Gemini 2.5 Flash ($0.009), Grok 4 ($0.06), DeepSeek V3 ($0.005), DeepSeek R1 ($0.01), Llama 3.3 70B ($0.002), Mistral Large 3 ($0.006), Qwen3 235B ($0.004), Perplexity Sonar Pro ($0.06).

Image Generation

Tool	Price	Description
`generate_image`	$0.015 - $0.12	AI image generation (fast/quality/text tiers)

Code Execution

Tool	Price	Description
`execute_code`	$0.005	Sandboxed code execution (Python, JS, Bash, R)

Audio

Tool	Price	Description
`transcribe_audio`	$0.10	Audio-to-text transcription (Deepgram Nova-3)
`tts_openai`	$0.01	Text-to-speech (OpenAI)
`tts_elevenlabs`	$0.02	Text-to-speech (ElevenLabs)

Text Embeddings

Tool	Price	Description
`create_embeddings`	$0.001	Text embeddings (OpenAI text-embedding-3-small)

Crypto & Market Data

Tool	Price	Description
`get_crypto_price`	$0.001	Current crypto prices
`get_crypto_markets`	$0.002	Top coins by market cap
`get_crypto_history`	$0.003	Historical price charts
`get_trending_crypto`	$0.001	Trending coins
`search_crypto`	$0.001	Search for coins

Blockchain & Wallet

Tool	Price	Description
`get_wallet_balances`	$0.005	Token balances for any wallet
`get_wallet_transactions`	$0.005	Transaction history
`get_wallet_pnl`	$0.01	Profit & loss analysis
`get_token_prices`	$0.005	DEX-derived token prices
`get_token_metadata`	$0.002	Token metadata
`simulate_transaction`	$0.01	Transaction simulation (Tenderly)

Web

Tool	Price	Description
`web_scrape`	$0.005	Scrape and extract web page content
`web_screenshot`	$0.01	Capture web page screenshot

IPFS Storage

Tool	Price	Description
`pin_to_ipfs`	$0.01	Pin JSON to IPFS
`get_from_ipfs`	$0.001	Retrieve content from IPFS

Discovery

Tool	Price	Description
`discover_services`	Free	List all services and pricing

📚 Documentation

Environment Variables

Variable	Required	Description
`X402_BASE_URL`	No	Gateway URL (default: `https://x402-gateway-production.up.railway.app`)
`X402_DEV_BYPASS`	No	Dev bypass secret to skip payments
`X402_PAYMENT_HEADER`	No	Pre-signed payment header