Agent services
brick.blue: find MCP servers, A2A agents and x402 endpoints that actually work
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brick.blue is an open registry of about 22,000 MCP servers, A2A agents and x402 endpoints. Every listing is measured, not copied from a card: whether it answers, whether its tools are free, paid or need a key, and what each call costs. Agents search it in plain words over MCP, A2A or REST and call what they find through the hub's router, with the price known before the call. No account is needed to search. Operators can claim their listing by proving the domain.