U.CASH Pay

Measured conclusion: Alive, not deep-tested. L2 outcome: not_attempted.

Pay x402 resources on U.CASH from your own wallet: view the price, pay on-chain, settle by hash.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "U.CASH Pay": {
      "url": "https://mcp.u.cash/",
      "transport": "streamable-http"
    }
  }
}

Measured tools (14)

• 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 to see what to pay, then uxc_verify_payment after paying. status=true polls settlement without minting a new challenge.

  Parameters:

  • res_id (required) — string
  • status — boolean — poll mode: GET /r/{id}?status=1 - no-mint settlement check

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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 (confirmed) or pending (awaiting confirmations). No seller key needed - the challengeId identifies the resource, and settlement is gated by on-chain confirmation.

  Parameters:

  • challengeId (required) — string
  • hash (required) — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Parameters:

  • q — string — filter by title/merchant/description
  • limit — integer
  • fields — array — Optional response projection: dot paths to keep, e.g. ["items.title","items.price"] or row-level ["title","price"]. Envelope/meta keys (ok, success, total, count, pagination) are always kept; unknown paths are ignored; empty/absent = full response.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Parameters:

  • limit — integer
  • fields — array — Optional response projection: dot paths to keep, e.g. ["items.asset","items.price"] or row-level ["asset","price"]. Envelope/meta keys (ok, success, total, count, pagination) are always kept; unknown paths are ignored; empty/absent = full response.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Parameters:

  • cloud — string
  • query — string
  • filters — string
  • pagination — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• uxc_get_product

  Fetch a single catalog product by id. Public (no key); pair with uxc_search_catalog to find ids.

  Parameters:

  • id (required) — string
  • cloud — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• uxc_lookup_products

  Batch catalog lookup by ids. Public (no key).

  Parameters:

  • ids (required) — array
  • cloud — string
  • fields — array — Optional response projection: dot paths to keep, e.g. row-level ["id","title","price"]. Envelope/meta keys (ok, success, total, count, pagination) are always kept; unknown paths are ignored; empty/absent = full response.

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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}.

  Parameters:

  • line_items (required) — array — each: {item:{id}, quantity}
  • buyer — string
  • cloud — string — merchant token when buying from a hosted merchant
  • context — string
  • currency — string — optional cart display currency

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• uxc_get_checkout

  Fetch a UCP checkout session by id (status: incomplete -> ready_for_complete -> completed). No key; pass cloud for a hosted merchant.

  Parameters:

  • id (required) — string
  • cloud — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Parameters:

  • id (required) — string
  • ap2 — string — optional AP2 checkout mandate
  • cloud — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• uxc_cancel_checkout

  Cancel a UCP checkout session. No key; pass cloud for a hosted merchant.

  Parameters:

  • id (required) — string
  • cloud — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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.

  Parameters:

  • id (required) — string
  • cloud — string

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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 directly with your own credentials; no call is ever proxied.

  Parameters:

  • q — string — case-insensitive substring over name/product/summary

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

• 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 directly; no call is ever proxied.

  Parameters:

  • q — string — substring matched over tool name + description
  • limit — integer
  • server — string — optional: restrict to one fleet server name

  Hints: read-only not declared · destructive not declared · idempotent not declared · open-world not declared

Repository

Measured by MCPYP probing. Untested fields are omitted, never estimated. Listing is always free; MCPYP never proxies calls or stores user tokens.