# Zylvie MCP by usefulapi (remote · zylvie.usefulapi.io)

Review Zylvie coupons, sales transactions and subscriptions.

- Trust score: 18/100 (low)
- Change this week: −41
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-06

## Components

- remote · `zylvie.usefulapi.io`: 18/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-zylvie/zylvie.md), [page](https://verifymcp.io/servers/io-usefulapi-zylvie/zylvie)

## Channel facts

- Endpoint: `https://zylvie.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.6.4`

## 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 2026-11-06.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not yet verified: we couldn't confirm whether this endpoint requires it.
  - HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly.
- **Schema Quality & AI Usability**: 0/100
  - Schema not yet verified: we couldn't read the endpoint's schema, or could read only part of its tool list.
- **Stability & Change Management**: 0/100
  - Stability not yet verified: not enough scan history yet (needs a 30-day window).
- **Tool Coverage**: 0/100
  - Tool coverage not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.
- **Tool Safety**: 0/100
  - Tool safety not yet verified: we couldn't read the endpoint's tools, or could read only part of the list.
- **Capabilities**: 0/100
  - Capabilities not yet verified: we couldn't read the endpoint's capabilities.

**Unverified: 5 categories.** Categories scored 0 because we could not verify them: authentication we do not have, an unreachable endpoint, or not enough scan history. We only credit what we can confirm.

## Install

### How do I install the Zylvie MCP by usefulapi server?

Zylvie MCP by usefulapi is a hosted endpoint at https://zylvie.usefulapi.io/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 io-usefulapi-zylvie 'https://zylvie.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-zylvie": {
      "url": "https://zylvie.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-zylvie": {
      "type": "http",
      "url": "https://zylvie.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-zylvie]
url = "https://zylvie.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-zylvie": {
      "type": "remote",
      "url": "https://zylvie.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-zylvie --url 'https://zylvie.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-zylvie:
    url: "https://zylvie.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-zylvie": {
      "Transport": "http",
      "Url": "https://zylvie.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-zylvie -t streamable-http -u 'https://zylvie.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-zylvie": {
      "type": "http",
      "url": "https://zylvie.usefulapi.io/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.

### 2026-11-06 (score 18, 0)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-11-02 (score 18, −45)

- [security regression] Endpoint reachability: reachable → not serving MCP
- [security regression] Stability: 0.07 → unverified
- [security regression] Tool safety: pass → unverified
- [security regression] Authorization: pass → unverified
- [functional regression] Schema quality: 100 → unverified
- [functional regression] Capabilities: pass → unverified
- [functional regression] Tool coverage: 100 → unverified

### 2026-11-01 (score 63, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-31 (score 62, +3)

- [security improvement] Authorization: partial → pass
- [functional improvement] Stability: unverified → 0.03
- [functional improvement] MCP protocol: fail → pass
- [functional] New prompt “inspect_sales_and_refund_activity”
- [functional] New prompt “review_coupon_performance”
- [functional] New prompt “review_upcoming_subscription_cancellations”
- [functional] MCP protocol version: 2025-06-18 → 2025-11-25
- [functional] Server version: 1.2.0 → 1.4.0
- [functional] Server version: 1.1.0 → 1.2.0
- [functional] Server version: 1.0.2 → 1.1.0

### 2026-10-30 (score 59)

First indexed and scored.

## MCP tools (4)

### `zylvie_get_account` (~34 tokens)

Get authenticating account

Authenticating account email and brand. Billing identity is per API key, not this email or brand. Read-only.

### `zylvie_list_coupons` (~49 tokens)

List coupons

All active coupons, or archived coupons when archived is true, with discount terms and redemption counts. This list is not paginated. Read-only.

Input parameters:

- `archived` (boolean)

### `zylvie_list_transactions` (~137 tokens)

List transactions

Transaction amounts, payment/refund status, buyer name/email and product summaries, newest first. Amounts are in major currency units; refunded false can include partial refunds. Excludes addresses, phone/card/bank details and custom fields. Read-only.

Input parameters:

- `date_from` (string)
- `date_to` (string)
- `email` (string)
- `limit` (integer)
- `page` (integer)
- `product_id` (string)
- `refunded` (boolean)
- `status` (string): Payment/subscription status; vendor values are open-ended.
- `transaction_id` (string)

### `zylvie_list_subscriptions` (~141 tokens)

List subscriptions

Subscription status, amount, cancellation/trial dates, product and buyer name/email, newest first. Amounts are major currency units, unlike the separate verify-subscription API. An active subscription may have cancel_at set. Excludes addresses, phone/card/bank details and custom fields. Read-only.

Input parameters:

- `date_from` (string)
- `date_to` (string)
- `email` (string)
- `limit` (integer)
- `page` (integer)
- `product_id` (string)
- `status` (string): Payment/subscription status; vendor values are open-ended.
- `subscription_id` (string)

## Diagnostics

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

## Score history

- 2026-11-06: 18
- 2026-11-05: 18
- 2026-11-04: 18
- 2026-11-03: 18
- 2026-11-02: 18
- 2026-11-01: 63
- 2026-10-31: 62
- 2026-10-30: 59

## Common questions

### What is the Zylvie MCP by usefulapi server?

Zylvie MCP by usefulapi is listed in the public MCP registry as io.usefulapi/zylvie. Review Zylvie coupons, sales transactions and subscriptions. This page covers its hosted endpoint (https://zylvie.usefulapi.io/mcp).

### Is the Zylvie MCP by usefulapi server safe to use?

Zylvie MCP by usefulapi scores 18 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 Zylvie MCP by usefulapi server expose?

Zylvie MCP by usefulapi exposes 4 tools: zylvie_get_account, zylvie_list_coupons, zylvie_list_transactions, zylvie_list_subscriptions. Their descriptions and schemas cost roughly 361 tokens of context every time the server is loaded.

### Does the Zylvie MCP by usefulapi server require authentication?

Its publisher declares no required credentials for Zylvie MCP by usefulapi. We have not been able to confirm that against the live endpoint, and a server can require authorisation without declaring it here.

### Is the Zylvie MCP by usefulapi server still maintained?

Zylvie MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 6 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the Zylvie MCP by usefulapi server?

VerifyMCP ran 4 checks on Zylvie MCP by usefulapi, covering TLS certificate, HSTS header, DNSSEC and Transport. 7 items could not be completed, a gap on our side rather than a finding about Zylvie MCP by usefulapi: Authorization, HTTPS, Schema quality, Stability and 3 more. 5 categories score 0 for that reason, because we only credit what we can confirm. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://zylvie.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Website: https://usefulapi.io/zylvie/
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-zylvie/zylvie.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-zylvie/zylvie/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/io-usefulapi-zylvie/zylvie.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-zylvie/zylvie