Summary
Gives Claude direct access to 50+ pay-per-call APIs through the x402 micropayment protocol. You get LLM inference across 16+ models (GPT-4o, Claude, Gemini, DeepSeek), image generation, sandboxed code execution in Python/JS/Bash, audio transcription and TTS, crypto market data from CoinGecko, on-chain wallet analysis, web scraping, and IPFS pinning. Each call costs between $0.001 and $0.12, paid in USDC on Base or Solana. Useful when you want Claude to orchestrate multiple AI services or access live crypto data without managing separate API keys. Payment happens automatically via HTTP 402 responses, though you can use a dev bypass token for testing.
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →
Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →
Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →
On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →
Tools
Public tool metadata for what this MCP can expose to an agent.
24 tools
discover_servicesList all available x402 Engine APIs with pricing, endpoints, and payment networks. Call this first to understand what's available.
List all available x402 Engine APIs with pricing, endpoints, and payment networks. Call this first to understand what's available.
No parameter schema in public metadata yet.
generate_imageGenerate an image from a text prompt. Three quality tiers: 'fast' ($0.015, FLUX Schnell), 'quality' ($0.05, FLUX.2 Pro), 'text' ($0.12, Ideogram v3 for images with text). Returns image URL.5 params
Generate an image from a text prompt. Three quality tiers: 'fast' ($0.015, FLUX Schnell), 'quality' ($0.05, FLUX.2 Pro), 'text' ($0.12, Ideogram v3 for images with text). Returns image URL.
Parameters* required
seednumberRandom seed for reproducibility
tierstringQuality tier: fast ($0.015), quality ($0.05), text ($0.12)one of
fast · quality · textdefault: fastwidthnumberImage width in pixelsdefault: 1024
heightnumberImage height in pixelsdefault: 1024
promptstringText description of the image to generate
execute_codeExecute code in a secure sandboxed environment (E2B). Supports Python, JavaScript, Bash, and R. $0.005 per execution.3 params
Execute code in a secure sandboxed environment (E2B). Supports Python, JavaScript, Bash, and R. $0.005 per execution.
Parameters* required
codestringCode to execute
timeoutnumberExecution timeout in seconds
languagestringProgramming languageone of
python · javascript · bash · rdefault: pythontranscribe_audioTranscribe audio to text using Deepgram Nova-3. Accepts a public URL to an audio file. $0.10 per transcription.4 params
Transcribe audio to text using Deepgram Nova-3. Accepts a public URL to an audio file. $0.10 per transcription.
Parameters* required
diarizebooleanEnable speaker identificationdefault: false
languagestringLanguage code (e.g., 'en', 'es')
audio_urlstringPublic URL to audio file (mp3, wav, etc.)
punctuatebooleanAdd punctuationdefault: true
get_crypto_priceGet current prices for cryptocurrencies. $0.001 per request.4 params
Get current prices for cryptocurrencies. $0.001 per request.
Parameters* required
idsstringComma-separated coin IDs (e.g., 'bitcoin,ethereum,solana')
currenciesstringComma-separated fiat currencies (default: 'usd')default: usd
include_24hbooleanInclude 24h price changedefault: true
include_mcapbooleanInclude market capdefault: false
get_crypto_marketsGet top cryptocurrencies by market cap with detailed market data. $0.002 per request.5 params
Get top cryptocurrencies by market cap with detailed market data. $0.002 per request.
Parameters* required
pagenumberPage numberdefault: 1
limitnumberNumber of resultsdefault: 20
orderstringSort orderdefault: market_cap_desc
categorystringFilter by category
currencystringFiat currency for pricesdefault: usd
get_crypto_historyGet historical price data for a cryptocurrency. $0.003 per request.3 params
Get historical price data for a cryptocurrency. $0.003 per request.
Parameters* required
idstringCoin ID (e.g., 'bitcoin')
daysvalueNumber of days of history (or 'max')default: 30
currencystringFiat currencydefault: usd
get_trending_cryptoGet trending cryptocurrencies. $0.001 per request.
Get trending cryptocurrencies. $0.001 per request.
No parameter schema in public metadata yet.
search_cryptoSearch for a cryptocurrency by name or symbol. $0.001 per request.1 params
Search for a cryptocurrency by name or symbol. $0.001 per request.
Parameters* required
qstringSearch query (coin name or symbol)
get_wallet_balancesGet token balances for a wallet address on any supported chain. $0.005 per request.2 params
Get token balances for a wallet address on any supported chain. $0.005 per request.
Parameters* required
chainstringBlockchain name (e.g., 'ethereum', 'base', 'solana', 'arbitrum')
addressstringWallet address
get_wallet_transactionsGet transaction history for a wallet address. $0.005 per request.2 params
Get transaction history for a wallet address. $0.005 per request.
Parameters* required
chainstringBlockchain name
addressstringWallet address
get_wallet_pnlGet profit and loss analysis for a wallet's token trades. $0.01 per request.4 params
Get profit and loss analysis for a wallet's token trades. $0.01 per request.
Parameters* required
chainstringBlockchain name
addressstringWallet address
min_liquiditynumberMinimum liquidity filter
min_volume_24hnumberMinimum 24h volume filter
get_token_pricesGet DEX-derived prices for tokens by contract address. $0.005 per request.1 params
Get DEX-derived prices for tokens by contract address. $0.005 per request.
Parameters* required
tokensarrayArray of tokens to price
get_token_metadataGet metadata for a token (name, symbol, decimals, etc.). $0.002 per request.4 params
Get metadata for a token (name, symbol, decimals, etc.). $0.002 per request.
Parameters* required
idstringToken ID (alternative to chain+address)
slugstringToken slug (alternative to chain+address)
chainstringBlockchain name (required with address)
addressstringToken contract address
pin_to_ipfsPin JSON data to IPFS via Pinata. Returns the IPFS CID. $0.01 per pin.2 params
Pin JSON data to IPFS via Pinata. Returns the IPFS CID. $0.01 per pin.
Parameters* required
jsonobjectJSON object to pin to IPFS
namestringName for the pinned content
get_from_ipfsRetrieve content from IPFS by CID. $0.001 per request.1 params
Retrieve content from IPFS by CID. $0.001 per request.
Parameters* required
cidstringIPFS content identifier (CID)
search_flightsSearch flight offers by route, dates, and passengers. Returns pricing, itineraries, and airlines. $0.01 per request.8 params
Search flight offers by route, dates, and passengers. Returns pricing, itineraries, and airlines. $0.01 per request.
Parameters* required
maxnumberMaximum number of offers to returndefault: 10
adultsnumberNumber of adult passengersdefault: 1
originstringOrigin airport IATA code (e.g., 'JFK')
nonStopbooleanOnly show non-stop flightsdefault: false
returnDatestringReturn date in YYYY-MM-DD format (for round trips)
destinationstringDestination airport IATA code (e.g., 'LAX')
currencyCodestringCurrency code for prices (e.g., 'USD', 'EUR')
departureDatestringDeparture date in YYYY-MM-DD format
search_locationsSearch for airports and cities by keyword. Returns IATA codes, names, and coordinates. $0.005 per request.2 params
Search for airports and cities by keyword. Returns IATA codes, names, and coordinates. $0.005 per request.
Parameters* required
keywordstringSearch keyword (e.g., 'London', 'JFK', 'Paris')
subTypestringLocation type filter: AIRPORT, CITY, or bothdefault: AIRPORT,CITY
search_hotelsSearch hotel offers by city and dates. Returns room details, pricing, and availability. $0.01 per request.7 params
Search hotel offers by city and dates. Returns room details, pricing, and availability. $0.01 per request.
Parameters* required
adultsnumberNumber of adult guests per roomdefault: 1
cityCodestringCity IATA code (e.g., 'PAR' for Paris, 'LON' for London)
currencystringCurrency code for prices (e.g., 'USD')
priceRangestringPrice range filter (e.g., '100-200')
checkInDatestringCheck-in date in YYYY-MM-DD format
checkOutDatestringCheck-out date in YYYY-MM-DD format
roomQuantitynumberNumber of roomsdefault: 1
search_cheapest_datesFind the cheapest travel dates for a route. Returns date/price pairs sorted by price. $0.01 per request.4 params
Find the cheapest travel dates for a route. Returns date/price pairs sorted by price. $0.01 per request.
Parameters* required
oneWaybooleanSearch one-way flights onlydefault: false
originstringOrigin airport IATA code (e.g., 'JFK')
destinationstringDestination airport IATA code (e.g., 'LAX')
departureDatestringApproximate departure date in YYYY-MM-DD format
resolve_ensResolve an ENS name (e.g. vitalik.eth) to an Ethereum address. $0.001 per request.1 params
Resolve an ENS name (e.g. vitalik.eth) to an Ethereum address. $0.001 per request.
Parameters* required
namestringENS name to resolve (e.g. 'vitalik.eth')
reverse_ensLook up the ENS name for an Ethereum address. Returns null if none set. $0.001 per request.1 params
Look up the ENS name for an Ethereum address. Returns null if none set. $0.001 per request.
Parameters* required
addressstringEthereum address (0x...)
llm_chatSend a chat completion request to any supported LLM. Models: gpt-4o ($0.04), gpt-4o-mini ($0.003), gpt-4.1 ($0.03), gpt-4.1-mini ($0.006), gpt-5 ($0.035), gpt-5-mini ($0.007), o3 ($0.03), o4-mini ($0.02), claude-opus ($0.09), claude-sonnet ($0.06), claude-haiku ($0.02), gemini...3 params
Send a chat completion request to any supported LLM. Models: gpt-4o ($0.04), gpt-4o-mini ($0.003), gpt-4.1 ($0.03), gpt-4.1-mini ($0.006), gpt-5 ($0.035), gpt-5-mini ($0.007), o3 ($0.03), o4-mini ($0.02), claude-opus ($0.09), claude-sonnet ($0.06), claude-haiku ($0.02), gemini...
Parameters* required
modelstringModel to useone of
gpt-4o · gpt-4o-mini · gpt-4.1 · gpt-4.1-mini · gpt-5 · gpt-5-minimessagesarrayChat messages array
max_tokensnumberMaximum tokens to generate (default: 1024, reasoning models: 4096)
create_embeddingsGenerate text embeddings using OpenAI text-embedding-3-small. For semantic search, clustering, and RAG. $0.001 per request.2 params
Generate text embeddings using OpenAI text-embedding-3-small. For semantic search, clustering, and RAG. $0.001 per request.
Parameters* required
textstringSingle text to embed (use this OR texts, not both)
textsarrayArray of texts to embed (1-100)
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
Featured
Keep your Mac awake while Claude Code and 40+ AI agents run. Sleeps when they're idle.
One time payment $9 →Integrate web data into your AI product. One API to scrape website & brand data.
Get API Key Now →Agent, run crypto. Access onchain data & trade routes via 1inch.
Install now →On Capafy, your Skill runs online 24/7 as an agent product, and you get paid every time someone uses it.
Start earning →Configuration
X402_BASE_URLGateway URL (default: https://x402engine.app)
X402_DEV_BYPASSsecretDev bypass secret to skip payments during testing
X402_PAYMENT_HEADERsecretPre-signed x402 payment header for automatic payment
Categories
Registryactive
Packagex402engine-mcp
TransportSTDIO
AuthRequired
UpdatedFeb 11, 2026
