Directory MCP server

What it does

AT Directory is an MCP server that indexes merchants accepting Bitcoin Lightning, BOLT12, L402, or USDT payments, with trust attestations from Observer Protocol. It is aimed at AI agents that need to discover and initiate payments with verified merchants. The server sits outside the payment path — agents use it to find merchants and then pay them directly.

• Search for merchants by category or payment rail to find services an agent can pay for autonomously.
• Retrieve a specific merchant's payment endpoint details and verify it is reachable before initiating a transaction.
• Browse available payment rails and merchant categories to decide which integration tier fits a given agent workflow.

Tools this server exposes

Tool	Does
search_merchants	Search the merchant index by keyword, category, or payment rail.
get_merchant	Retrieve the full record for a specific merchant by identifier.
verify_payment_endpoint	Check that a merchant's payment endpoint is reachable and valid.
list_categories	Return the full category taxonomy used to classify merchants.
list_rails	Return all supported payment rails and USDT chains in the directory.
whoami	Return information about the current caller's identity and access level.

Before you enable it

An MCP server runs with whatever access you give it. Start with a development account rather than production, and check which tools the server exposes before you let an agent call them unattended.