# Winback: pay-on-success win-back

> Pay-on-success win-back for RevenueCat and Stripe apps. Read-only pricing, fit and estimates.

- name: com.winbackhq/winback
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 81/100 (new)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.winbackhq%2Fwinback
- tools: https://api.protogrid.dev/v1/servers/com.winbackhq%2Fwinback/tools

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

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "winback": {
      "type": "http",
      "url": "https://winbackhq.com/mcp/"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-3d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 81/100 (new)

### 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: 86 (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
- pass `tools.annotations`: 4 of 4 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: get_winback_pricing (destructiveHint, idempotentHint); get_winback_overview (destructiveHint, idempotentHint); get_apple_retention_facts (destructiveHint, idempotentHint); …
- pass `tools.token_cost`: about 449 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

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

- n/a `stability.changes`, `stability.rug_pull`: tool history recorded for 2 of the 7 days needed

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

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

- tools: 4, about 449 tokens to load them all
- tool set hash: ab2d1dca3751205ce74f71bbab4c7d4d
- badge: [![protogrid quality](https://protogrid.dev/badge/com.winbackhq/winback.svg)](https://protogrid.dev/servers/com.winbackhq/winback)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

_No tool definition changes recorded._

## Remotes

- https://winbackhq.com/mcp/ (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (4)

- `estimate_win_back_revenue`: Same formula as https://winbackhq.com/tools/win-back-revenue-calculator/ : people lost per segment times a return rate, times price, over up to 6 months, minus the 15% fee. Default return rates: cancelled 20% (RevenueCat SOSA 2026 monthly reactivation within a year, a reference not a forecast), billing failed 10% (assumption), trial expired 5% (assumption).
- `get_apple_retention_facts`: Sourced facts on App Store billing retry, grace periods, win-back offers and Retention Messaging, for founders planning a win-back.
- `get_winback_overview`: What Winback does, who it is for, what it needs and what it does not do. Use this when someone asks how to win back churned subscribers of an iOS, Android or Stripe subscription app.
- `get_winback_pricing`: Winback pricing terms.