Discover, browse, filter, and pay for x402-compatible API endpoints and MCP tools from the x402 Bazaar — the autonomous discovery layer for agentic payments. Browse all available services, filter by price or type, inspect payment requirements, and call any discovered endpoint using USDC micropayments on Base with no API keys or account setup. Use when the agent needs to find a payable API service, check what x402 services exist for a given task (web scraping, AI inference, weather data, market data), pay for a single API call via x402, or list services under a given price threshold. Requires EVM_PRIVATE_KEY in .env (Base wallet with USDC) for paid calls. Discovery browsing requires no keys at all.
Discover, browse, filter, and pay for x402-compatible API endpoints and MCP tools from the x402 Bazaar — the autonomous discovery layer for agentic payments. Browse all available services, filter by price or type, inspect payment requirements, and call any discovered endpoint using USDC micropayments on Base with no API keys or account setup. Use when the agent needs to find a payable API service, check what x402 services exist for a given task (web scraping, AI inference, weather data, market data), pay for a single API call via x402, or list services under a given price threshold. Requires EVM_PRIVATE_KEY in .env (Base wallet with USDC) for paid calls. Discovery browsing requires no keys at all.
x402 Bazaar Skill
The x402 Bazaar is the discovery layer for the x402 ecosystem — a
machine-readable catalog helping AI agents find and integrate with x402-compatible
API endpoints and MCP tools. Query, find, pay, and use with no pre-baked
integrations.
Two modes:
Browse only — no wallet needed, zero cost, discover all available services
Browse + Pay — requires Base wallet with USDC to call discovered endpoints
Call a discovered service (requires EVM_PRIVATE_KEY + USDC)
python3 agent.py "call https://api.example.com/x402/weather?location=NYC"
python3 agent.py "pay and call https://api.example.com/x402/sentiment"
Full autonomous flow: find + pay + use
python3 agent.py "find the cheapest weather API and get weather for London"
python3 agent.py "find a web scraping API and scrape https://example.com"
How x402 Payment Works
Agent discovers a service from the Bazaar catalog
Calls the endpoint — gets HTTP 402 Payment Required response
Reads payment requirements from the 402 response headers
Pays via facilitator using USDC on Base
Retries the exact same request with payment proof header
Service verifies proof and returns paid result
No accounts, no subscriptions, no API keys — just USDC per request.
MCP Integration
This skill can be integrated with Model Context Protocol (MCP) servers to enable
Claude Desktop and other MCP clients to autonomously pay for and use x402 APIs.
Note: This skill handles both v1 (flat list) and v2 (wrapped response) for resilience.
MCP tool uniqueness: For MCP servers, uniqueness is determined by (resource_url, tool_name),
not just the URL, since one MCP server can host multiple tools.
