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.
Add to your claude_desktop_config.json:
{
"mcpServers": {
"x402engine": {
"command": "npx",
"args": ["-y", "x402engine-mcp"],
"env": {
"X402_DEV_BYPASS": "your-dev-bypass-secret"
}
}
}
}claude mcp add x402engine -- npx -y x402engine-mcp
| 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).
| Tool |
Price |
Description |
generate_image |
$0.015-$0.12 |
AI image generation (fast/quality/text tiers) |
| Tool |
Price |
Description |
execute_code |
$0.005 |
Sandboxed code execution (Python, JS, Bash, R) |
| 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) |
| Tool |
Price |
Description |
create_embeddings |
$0.001 |
Text embeddings (OpenAI text-embedding-3-small) |
| 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 |
| 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) |
| Tool |
Price |
Description |
web_scrape |
$0.005 |
Scrape and extract web page content |
web_screenshot |
$0.01 |
Capture web page screenshot |
| Tool |
Price |
Description |
pin_to_ipfs |
$0.01 |
Pin JSON to IPFS |
get_from_ipfs |
$0.001 |
Retrieve content from IPFS |
| Tool |
Price |
Description |
discover_services |
Free |
List all services and pricing |
| 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 |
- Base (EVM) — USDC, 6 decimals, ~2s confirmation
- Solana — USDC, 6 decimals, ~400ms confirmation
- MegaETH (EVM) — USDm, 18 decimals, ~10ms confirmation
- Agent calls an MCP tool (e.g.,
llm_chat)
- MCP server makes HTTP request to x402engine.app
- Gateway returns
402 Payment Required with 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.