---
title: "Reply to comment"
method: POST
path: "/v1/messaging/inbox/comments/{postId}"
tags: ["Inbox comments"]
---

# Reply to comment

`POST /v1/messaging/inbox/comments/{postId}`

## Request

- Base URL: `https://apihub.co.il`
- URL: `https://apihub.co.il/v1/messaging/inbox/comments/{postId}`
- Auth: HTTP bearer

Post a reply to a post or specific comment. Requires accountId in request body.

**Idempotency:** send an `Idempotency-Key` header to make retries safe
(e.g. after a client-side timeout where delivery is unknown): same key +
same body replays the original response (with `Idempotent-Replayed: true`)
instead of posting the comment a second time; same key + different body
returns 422; a key still in flight returns 409. Keys are retained for 24
hours and are scoped to the credential and to this exact path, so reusing
a key against a different postId returns 422 rather than replaying the
other post's response.

Only successful (2xx) responses are stored for replay. If the request
throws or returns a non-2xx status the key is released, so the header
protects the "request succeeded but the response was lost" case. After an
ambiguous failure (a 5xx or a network timeout) list the post's comments
before retrying with the same key, and treat an empty result as
inconclusive rather than as proof nothing was posted.


**Billing:** Request; paid actions are priced in credits (see GET /v1/messaging/prices) · **Rate limit:** 60/min

## Path parameters

- `postId` string, required: Zernio post ID or platform-specific post ID. On LinkedIn, pass the post id exactly as the feed returns it (urn:li:share:<id> or urn:li:ugcPost:<id>); a bare number is read as an activity id (urn:li:activity:<n>).

## Headers

- `Idempotency-Key` string
- `X-Tag` string

## Request body

- object
  - `message` string, required
  - `rootCid` string: (Bluesky only) Root post CID
  - `rootUri` string: (Bluesky only) Root post URI
  - `accountId` string, required
  - `commentId` string: Reply to specific comment (optional)
  - `parentCid` string: (Bluesky only) Parent content identifier
  - `attachmentUrl` string, uri: (Facebook only) URL of an image to attach, publishing a photo comment alongside the text. The URL must be publicly accessible so Meta can fetch it. Returns 400 for other platforms.

## Response `200`

Completed

- object
  - `id` string: Execution id — stable across internal retries; use it with GET /v1/executions/{id}
  - `status` 'pending' | 'processing' | 'completed' | 'partial' | 'failed' | 'cancelled' | 'timeout'
  - `operation` string
  - `tag` string, nullable: Your X-Tag, if sent
  - `created_at` string, date-time
  - `completed_at` string, date-time, nullable
  - `output` object: Operation result (see each operation). While a Studio render is processing: `stage` (queued · transcribing · downloading · preparing · cleaning_voice · mixing_audio · rendering · finishing), `phase` (the engine's: download · prepare · voice · audio · encode · qa · upload, or null), `progress` (a percent, 0–100) and `progress_fraction` (0–1), `eta_seconds` (seconds left, never below 0) and `estimate_seconds`
    - `data` object
      - `cid` string, nullable: Bluesky CID
      - `isReply` boolean
      - `commentId` string
    - `success` boolean
  - `error` string, nullable
  - `usage` object
    - `credits_charged` number, nullable
    - `credits_reserved` number
    - `estimated_credits` number
    - `cost_source` 'provider_reported' | 'calculated' | 'estimated' | 'null', nullable
    - `provider_usage` object, nullable: Normalised consumption, e.g. { VIDEO_SECOND: 22.4 }
  - `balance` object
    - `available` number
    - `reserved` number

## Other responses

- `400`: Invalid input
- `402`: Insufficient credits / project budget
- `404`: Resource not found (or not yours)
- `429`: Rate limited
- `503`: Service temporarily paused

---

[API](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai.md) · [All operations](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai/llms.txt) · [OpenAPI document](https://skmtc.dev/apihub/apis/apihub-one-api-for-chat-image-video-ai/revisions/a8caa42835ce?raw)