webhook-inbox MCP server

• capture_inboxFree

  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.

• checkout_creditsFree

  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.

• confirm_creditsFree

  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.

• credit_balanceFree

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

• credit_eventsFree

  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.

• healthFree

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

• issue_keyFree

  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.

• list_credit_packsFree

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

• list_inbox_eventsFree

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

• mint_inboxFree

  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.

• quote_creditsFree

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

• revoke_inboxFree

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

• revoke_keyFree

  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.

• rotate_keyFree

  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.

• verify_keyFree

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

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 608ms20/20
• Tool poisoning15 tool descriptions checked15/15
• Auth qualityAPI key sent as a header8/15
• Maintenanceno repository listed3/15
• Maintainer identityverified namespace with website, no repo4/10

webhook-inbox: common questions

Is webhook-inbox MCP server safe?

With care: it is graded C, so read the findings first (67/100). Read the webhook-inbox safety report

How do I install webhook-inbox?

It runs remotely at inbox.kymac.co. Add it to Claude Code, Claude Desktop or Cursor with the snippets above, or call it through the mcp.market gateway without installing anything.

Does webhook-inbox need an API key?

Yes. The registry entry asks for Authorization, X-API-Key.

Is webhook-inbox maintained?

The latest release is v0.4.1.

Is webhook-inbox up?

100% of our last 1 checks got an answer. We check remote servers about four times a day.

What can I use instead of webhook-inbox?

Servers from other publishers that do the same job: Email Inbox API + Sending by Sendmux MCP server, Chatgenius MCP server and PostZen MCP server. Compare all webhook-inbox alternatives.