U MCP server

Which servers in the official MCP registry are U's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-13

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Whose server it is

Registry namecash.u/ucash-payverified in the MCP registry

The registry name sits under u.cash. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-13

Stateanswerschecked 2026-10-13
Tools14
Server calls itselfucash-pay
Server version0.10.0
Protocol version2025-06-18

On 2026-10-13 the server answered initialize and tools/list without a sign-in. First answer in 233 ms.

Tools it offers14 tools · read 2026-10-13

uxc_view_door
Fetch the public 402 payment door for a resource (what a buyer sees at https://agents.u.cash/r/{res_id}): the price + the multi-coin accepts[] (each asset, the seller receive address, and the exact amount to pay). No key. Use as a BUYER…
uxc_verify_payment
BUYER-SIDE. After paying a resource (from uxc_view_door) on-chain from your own wallet, submit the transaction hash to settle it. Pass the challengeId from the accepts[] entry you paid and the on-chain transaction hash. Returns settled…
uxc_get_market
The PUBLIC cross-merchant market catalog: every published checkout across merchants (id, title, price, currency, merchant, domain, payable url). No key. q filters by title/merchant/description.
uxc_get_services
The PUBLIC cross-provider services catalog (eSend rail: each row carries the provider contact email, a sendable asset code and a price). No key.
uxc_search_catalog
Search a merchant catalog (text query + price filters + pagination). The merchant is resolved from a cloud token (the "cloud" argument) or the platform default. No key.
uxc_get_product
Fetch a single catalog product by id. Public (no key); pair with uxc_search_catalog to find ids.
uxc_lookup_products
Batch catalog lookup by ids. Public (no key).
uxc_create_checkout
Create a UCP checkout session (multi-item, mixed-currency cart) for a merchant catalog. No key. Returns {id, status, currency, line_items, totals, ap2}.
uxc_get_checkout
Fetch a UCP checkout session by id (status: incomplete -> ready_for_complete -> completed). No key; pass cloud for a hosted merchant.
uxc_complete_checkout
Mint payment challenges for a checkout session -> ready_for_complete. Optional ap2 (AP2 checkout mandate). No key; pass cloud for a hosted merchant.
uxc_cancel_checkout
Cancel a UCP checkout session. No key; pass cloud for a hosted merchant.
uxc_get_order
View a UCP checkout session as an order (per-item fulfillment status + fulfillment events). No key; pass cloud for a hosted merchant.
uxc_discover_servers
List every u.cash MCP server in the fleet (buyer, seller, prime, legacy): product surface, auth model, transports with install coordinates, docs URL. Optional q filters by name/product/summary. Discovery only - connect to each server…
uxc_discover_tools
Search tools across every u.cash MCP server by name or description (case-insensitive substring), optionally scoped to one server. Returns the tool, a one-liner, its server, and how to connect. Discovery only - connect to that server…

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

{
  "mcpServers": {
    "ucash-pay": {
      "type": "http",
      "url": "https://mcp.u.cash/"
    }
  }
}

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.