# Tapwhich (remote · tapwhich.openkrill.app)

Which of your cards to tap at a place: the cashback, cap and conditions, from the banks' own pages.

- Trust score: 72/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- remote · `tapwhich.openkrill.app`: 72/100 (this document), [markdown](https://verifymcp.io/servers/app-openkrill-tapwhich/tapwhich.md), [page](https://verifymcp.io/servers/app-openkrill-tapwhich/tapwhich)

## Channel facts

- Endpoint: `https://tapwhich.openkrill.app/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-17.

- **Endpoint Security**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 57/100
  - AI-judged instruction clarity (good).
  - Context-footprint check failed: tool/resource definitions use about 548 tokens (~548/item across 1 items; 1 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 1 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 2 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the Tapwhich MCP server?

Tapwhich is a hosted endpoint at https://tapwhich.openkrill.app/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http app-openkrill-tapwhich 'https://tapwhich.openkrill.app/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "app-openkrill-tapwhich": {
      "url": "https://tapwhich.openkrill.app/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "app-openkrill-tapwhich": {
      "type": "http",
      "url": "https://tapwhich.openkrill.app/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.app-openkrill-tapwhich]
url = "https://tapwhich.openkrill.app/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "app-openkrill-tapwhich": {
      "type": "remote",
      "url": "https://tapwhich.openkrill.app/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add app-openkrill-tapwhich --url 'https://tapwhich.openkrill.app/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  app-openkrill-tapwhich:
    url: "https://tapwhich.openkrill.app/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "app-openkrill-tapwhich": {
      "Transport": "http",
      "Url": "https://tapwhich.openkrill.app/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add app-openkrill-tapwhich -t streamable-http -u 'https://tapwhich.openkrill.app/mcp'
```

### Other

```json
{
  "mcpServers": {
    "app-openkrill-tapwhich": {
      "type": "http",
      "url": "https://tapwhich.openkrill.app/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-17 (score 72, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-16 (score 71)

First indexed and scored.

## MCP tools (1)

### `pick_card` (~360 tokens)

Which card to tap here

Use this when someone asks which of their credit or debit cards to pay with at a shop, app, category or city, to get the most cashback. Pass the place (a merchant such as Grab or Shopee, a category such as dining or supermarket, or a city such as Tokyo, or both: 'dining in Tokyo') and the cards they hold (names or ids). It answers in one line, 'use card X here, because Y, up to cap Z', with the second-best card, each card's cap and conditions, and the bank source link. The data pack covers Vietnam-issued cards; amounts are in VND.

Input parameters:

- `amount` (number): Purchase amount, in VND unless currency says otherwise. Default 1,000,000 VND.
- `cards` (array, required): The cards the person holds, by name ('VPBank Z JCB') or id ('vpbank-z-jcb').
- `channel` (string): Online or in a shop, when the place alone does not say.
- `currency` (string): ISO code of amount when the person gives a foreign amount, such as JPY for 8,000 yen. The tool converts at its own dated rate; do not convert yourself.
- `date` (string): Purchase date YYYY-MM-DD. Default today in Vietnam.
- `picks` (object): Bonus categories picked on pick-N cards, by group (vib-one, vib-max, cake-freedom, msb-mdigi).
- `place` (string, required): Merchant, category or city, for example 'Grab', 'supermarket', 'dining in Tokyo'.
- `statement_spend` (object): Spend so far this statement by card id, for minimum spend and tiers.

Output parameters:

- `amount` (number)
- `answer` (string)
- `best` (object|null)
- `check` (string)
- `converted_from` (object|null)
- `currency` (string)
- `date` (string)
- `freshness` (string|null)
- `pack` (object)
- `place` (object)
- `ranking` (array)
- `second` (object|null)

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/app-openkrill-tapwhich/tapwhich#diagnostics

## Score history

- 2026-10-17: 72
- 2026-10-16: 71

## Common questions

### What is the Tapwhich MCP server?

Tapwhich is an MCP server listed in the public MCP registry as app.openkrill/tapwhich. Which of your cards to tap at a place: the cashback, cap and conditions, from the banks' own pages. This page covers its hosted endpoint (https://tapwhich.openkrill.app/mcp).

### Is the Tapwhich MCP server safe to use?

Tapwhich scores 72 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Tapwhich MCP server expose?

Tapwhich exposes 1 tool: pick_card. Their descriptions and schemas cost roughly 360 tokens of context every time the server is loaded.

### Does the Tapwhich MCP server require authentication?

No. We connected to Tapwhich without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Tapwhich MCP server still maintained?

Tapwhich is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://tapwhich.openkrill.app/mcp
- Website: https://tapwhich.openkrill.app/
- Changelog RSS feed: https://verifymcp.io/servers/app-openkrill-tapwhich/tapwhich.xml
- Changelog JSON feed: https://verifymcp.io/servers/app-openkrill-tapwhich/tapwhich.json
- HTML version of this page: https://verifymcp.io/servers/app-openkrill-tapwhich/tapwhich