# webhook-inbox (remote · inbox.kymac.co)

Ephemeral HTTPS inbox for bots: mint URL, capture POSTs, list JSON. TEST. https://inbox.kymac.co

- Trust score: 63/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `inbox.kymac.co`: 63/100 (this document), [markdown](https://verifymcp.io/servers/co-kymac-inbox-webhook-inbox/inbox.md), [page](https://verifymcp.io/servers/co-kymac-inbox-webhook-inbox/inbox)

## Channel facts

- Endpoint: `https://inbox.kymac.co/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.4.1`

## 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 2026-09-20.

- **Endpoint Security**: 57/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation check failed: no authorisation is required to call this server, and it exposes a tool marked destructive (revoke_key).
  - HTTPS is enforced; there's no plaintext access path.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 78/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 960 tokens (~64/item across 15 items; 15 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 7/100
  - Stability observed for 2 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.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - All 2 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.
  - An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 40/100
  - Spec-recency check failed: implements MCP spec 2025-03-26; the latest is 2026-07-28.

## Install

### How do I install the webhook-inbox MCP server?

webhook-inbox is a hosted endpoint at https://inbox.kymac.co/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 co-kymac-inbox-webhook-inbox 'https://inbox.kymac.co/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "co-kymac-inbox-webhook-inbox": {
      "url": "https://inbox.kymac.co/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "co-kymac-inbox-webhook-inbox": {
      "type": "http",
      "url": "https://inbox.kymac.co/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.co-kymac-inbox-webhook-inbox]
url = "https://inbox.kymac.co/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "co-kymac-inbox-webhook-inbox": {
      "type": "remote",
      "url": "https://inbox.kymac.co/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add co-kymac-inbox-webhook-inbox --url 'https://inbox.kymac.co/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  co-kymac-inbox-webhook-inbox:
    url: "https://inbox.kymac.co/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "co-kymac-inbox-webhook-inbox": {
      "Transport": "http",
      "Url": "https://inbox.kymac.co/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add co-kymac-inbox-webhook-inbox -t streamable-http -u 'https://inbox.kymac.co/mcp'
```

### Other

```json
{
  "mcpServers": {
    "co-kymac-inbox-webhook-inbox": {
      "type": "http",
      "url": "https://inbox.kymac.co/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.

### 2026-09-19 (score 63, +1)

- [functional improvement] Stability: unverified → 0.03

### 2026-09-18 (score 62)

First indexed and scored.

## MCP tools (15)

### `issue_key` (~89 tokens)

Issue caller key — webhook inbox, request bin

Mint a caller key (POST /keys). Bot install starts at GET https://inbox.kymac.co/llms.txt (sole advertised entry). Secret whi_… is returned once. Prefer Authorization: Bearer; X-API-Key is an alias. First issue grants 1 free credit (credit.grant reason=first_key). Quote cost with quote_credits before mint_inbox.

### `verify_key` (~42 tokens)

Verify caller key — webhook inbox, request bin

Confirm WEBHOOK_INBOX_API_KEY or Authorization: Bearer (GET /keys/verify). X-API-Key is an alias only. Does not echo the secret.

### `rotate_key` (~66 tokens)

Rotate caller key — webhook inbox, request bin

Replace the presented secret (POST /keys/rotate). Same id/caller_id and credits. New whi_… is returned once. Old secret then fails 401 invalid_api_key. Prefer Authorization: Bearer; X-API-Key is an alias only. No ops file-edit.

### `revoke_key` (~55 tokens)

Revoke caller key — webhook inbox, request bin

Invalidate the presented secret (POST /keys/revoke). Same id is revoked; old secret then fails 401 invalid_api_key. Prefer Authorization: Bearer; X-API-Key is an alias only. No ops file-edit.

### `list_credit_packs` (~35 tokens)

List credit packs — webhook inbox, request bin

Prepaid TEST packs (GET /credits/packs). checkout_credits is intent only; credits grant after confirm_credits.

### `checkout_credits` (~70 tokens)

Checkout credit pack — webhook inbox, request bin

Stripe TEST PaymentIntent for a pack (POST /credits/checkout). Intent only — returns credits_pending; credits are not granted or spendable until confirm_credits succeeds. Requires a caller key.

Input parameters:

- `pack_id` (string, required): Pack id from list_credit_packs (e.g. pack_10).

### `confirm_credits` (~72 tokens)

Confirm TEST credit purchase — webhook inbox, request bin

Confirm a TEST PaymentIntent with Stripe test card pm_card_visa (POST /credits/confirm). This is when credits become granted/spendable (appends credit.purchase with credits_added). TEST only.

Input parameters:

- `stripe_payment_intent_id` (string, required): PaymentIntent id (pi_…) from checkout_credits.

### `quote_credits` (~52 tokens)

Quote credit cost — webhook inbox, request bin

Dry-run cost for an op without debit (GET /credits/quote?op=inbox). Returns cost, balance, and would_succeed.

Input parameters:

- `op` (string): Operation to quote. Defaults to inbox.

### `credit_balance` (~22 tokens)

Credit balance — webhook inbox, request bin

Derived prepaid balance for this caller_id (GET /credits/balance).

### `credit_events` (~46 tokens)

Credit ledger events — webhook inbox, request bin

Append-only Ledger events for this caller_id (GET /credits/events): credit.grant (first_key), credit.purchase, credit.debit reason=inbox_mint, optional credit.balance_snapshot.

### `mint_inbox` (~147 tokens)

Mint ephemeral inbox — webhook inbox, request bin

Mint a capture URL (POST /inbox). Install via GET https://inbox.kymac.co/llms.txt only. Prefer Authorization: Bearer; X-API-Key is an alias. First key includes 1 free credit. Quote first with quote_credits (no debit). Debits 1 credit on success (credit.debit reason=inbox_mint, request_id=inbox id). 201 body includes id, capture_url, expires_at, credits_remaining. HTTP fails use code/message/retryable/next (error aliases message). 401 next=refresh key. 402: code=insufficient_credits, retryable=false, next=buy credits.

### `capture_inbox` (~125 tokens)

Capture a raw POST — webhook inbox, request bin

Public capture (POST /c/{id}). No API key. No debit. Not an install entry. Stores raw body + headers for list_inbox_events. Rejects revoked (410 inbox_revoked) or expired (410 inbox_expired) inboxes. Body limit 1MB.

Input parameters:

- `body`: Raw capture payload. Objects are JSON-encoded. Strings are sent as-is.
- `content_type` (string): Content-Type for the capture. Defaults to application/json for objects.
- `id` (string, required): Inbox id from mint_inbox (inb_…).

### `list_inbox_events` (~61 tokens)

List captured POSTs — webhook inbox, request bin

Owner list (GET /inbox/{id}/events). Returns captured POSTs as JSON (headers + body). Does not debit. Other callers see 404.

Input parameters:

- `id` (string, required): Inbox id from mint_inbox (inb_…).

### `revoke_inbox` (~48 tokens)

Revoke inbox early — webhook inbox, request bin

Stop further captures (DELETE /inbox/{id}). Does not refund the mint debit. Owner only.

Input parameters:

- `id` (string, required): Inbox id from mint_inbox (inb_…).

### `health` (~30 tokens)

Health — webhook inbox, request bin

Public readiness (GET /health): billing (test|live|gated) and runner_ready. No key.

## Diagnostics

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

## Score history

- 2026-09-20: 63
- 2026-09-19: 63
- 2026-09-18: 62

## Common questions

### What is the webhook-inbox MCP server?

webhook-inbox is an MCP server listed in the public MCP registry as co.kymac.inbox/webhook-inbox. Ephemeral HTTPS inbox for bots: mint URL, capture POSTs, list JSON. TEST. https://inbox.kymac.co. This page covers its hosted endpoint (https://inbox.kymac.co/mcp).

### Is the webhook-inbox MCP server safe to use?

webhook-inbox scores 63 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 webhook-inbox MCP server expose?

webhook-inbox exposes 15 tools: issue_key, verify_key, rotate_key, revoke_key, list_credit_packs, and 10 more. Their descriptions and schemas cost roughly 960 tokens of context every time the server is loaded.

### Does the webhook-inbox MCP server require authentication?

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

### Is the webhook-inbox MCP server still maintained?

webhook-inbox is still listed as active in the MCP registry. We last reached this channel on 20 September 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://inbox.kymac.co/mcp
- Website: https://inbox.kymac.co/llms.txt
- Changelog RSS feed: https://verifymcp.io/servers/co-kymac-inbox-webhook-inbox/inbox.xml
- Changelog JSON feed: https://verifymcp.io/servers/co-kymac-inbox-webhook-inbox/inbox.json
- HTML version of this page: https://verifymcp.io/servers/co-kymac-inbox-webhook-inbox/inbox