# U.CASH Pay

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

- name: cash.u/ucash-pay
- version: 0.10.0
- connection class: R0 (autonomous)
- trust: 92/100
- quality: 79/100 (good)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/cash.u%2Fucash-pay
- tools: https://api.protogrid.dev/v1/servers/cash.u%2Fucash-pay/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

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


## Trust

- hygiene: 100
- liveness: 97
- freshness: 100
- provenance: 75
- drivers: +repository +dns-namespace +reachable +uptime-92% +updated-16d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 79/100 (good)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 71 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: uxc_view_door (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); uxc_discover_servers (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); uxc_verify_payment (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 1,504 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 100 (weight 15)

- pass `stability.changes`: 5 tool changes in 30 days
- pass `stability.rug_pull`: no tool changed its meaning under the same name

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 14, about 1,504 tokens to load them all
- tool set hash: fd5b58b6540b4599c97a24e255ea9d7b
- tools last changed: 2026-10-05T07:19:14.733Z
- badge: [![protogrid quality](https://protogrid.dev/badge/cash.u/ucash-pay.svg)](https://protogrid.dev/servers/cash.u/ucash-pay)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-05 `uxc_discover_tools` added
  - 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.
- 2026-10-05 `uxc_discover_servers` added
  - 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.
- 2026-10-05 `uxc_lookup_products` changed (inputSchema)
- 2026-10-05 `uxc_get_services` changed (inputSchema)
- 2026-10-05 `uxc_get_market` changed (inputSchema)

Full history: https://api.protogrid.dev/v1/servers/cash.u%2Fucash-pay/changes

## Remotes

- https://mcp.u.cash/ (streamable-http, auth none, reachable true, uptime30d 0.91803277)

## Packages

_none_

## Tools (14)

- `uxc_cancel_checkout`: Cancel a UCP checkout session. 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_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_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.
- `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.
- `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_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_order`: View a UCP checkout session as an order (per-item fulfillment status + fulfillment events). No key; pass cloud for a hosted merchant.
- `uxc_get_product`: Fetch a single catalog product by id. Public (no key); pair with uxc_search_catalog to find ids.
- `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_lookup_products`: Batch catalog lookup by ids. Public (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_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.
- `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.