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50+ pay-per-call APIs for AI agents — images, LLM, code, crypto, travel & more via x402
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50+ pay-per-call APIs for AI agents — images, LLM, code, crypto, travel & more via x402
Security Report
7.0
Moderate7.0Low RiskValid MCP server (1 strong, 1 medium validity signals). 3 known CVEs in dependencies (0 critical, 3 high severity) Package registry verified. Imported from the Official MCP Registry.
3 files analyzed · 4 issues found
Security scores are indicators to help you make informed decisions, not guarantees. Always review permissions before connecting any MCP server.
Permissions Required
This plugin requests these system permissions. Most are normal for its category.
What You'll Need
Set these up before or after installing:
Gateway URL (default: https://x402engine.app)
Environment variable: X402_BASE_URL
Dev bypass secret to skip payments during testingRequired
Environment variable: X402_DEV_BYPASS
Pre-signed x402 payment header for automatic paymentRequired
Environment variable: X402_PAYMENT_HEADER
How to Install
Add this to your MCP configuration file:
{
"mcpServers": {
"io-github-agentc22-x402engine-mcp": {
"env": {
"X402_BASE_URL": "your-x402-base-url-here",
"X402_DEV_BYPASS": "your-x402-dev-bypass-here",
"X402_PAYMENT_HEADER": "your-x402-payment-header-here"
},
"args": [
"-y",
"x402engine-mcp"
],
"command": "npx"
}
}
}Documentation
View on GitHubFrom the project's GitHub README.
x402engine-mcp
MCP server for x402 Engine — giving AI agents access to 38 pay-per-call APIs via HTTP 402 micropayments.
Payments are made with USDC on Base, USDC on Solana, or USDm on MegaETH. Prices range from $0.001 to $0.12 per call.
Quick Start
Claude Desktop
Add 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
Available Tools
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 |
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 |
Payment Networks
- Base (EVM) — USDC, 6 decimals, ~2s confirmation
- Solana — USDC, 6 decimals, ~400ms confirmation
- MegaETH (EVM) — USDm, 18 decimals, ~10ms confirmation
How It Works
- Agent calls an MCP tool (e.g.,
llm_chat) - MCP server makes HTTP request to x402engine.app
- Gateway returns
402 Payment Requiredwith pricing - Agent pays with crypto via the x402 protocol
- Gateway verifies payment on-chain and returns data
For automatic payment handling, use @x402/fetch in your agent code.
Links
- Gateway: x402engine.app
- Discovery: x402engine.app/.well-known/x402.json
- GitHub: github.com/agentc22/x402engine-mcp
- Protocol: x402.org
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