youtube.comment_replies

beta 2 credits may need a pack

Replies to a YouTube comment (cursor from the parent comment's replies continuation).

GET /v1/youtube/comment_replies

What you get#

A list of YouTube results in Onekey's unified shape, in data (an array). An empty array is a normal, successful answer and is charged like any other; a source that reports "nothing found" as an error returns a free 404 not_found instead.

Also known as: /youtube/video/comment/replies on APIs that nest their paths. See Alternatives and equivalents.

What it costs#

2 credits for a fresh fetch, charged only when it succeeds.
Free when served from cache (0.2 credit for a cached response over 100 KB).
Free if the request is invalid (never charged) or the source fails or reports not found (refunded).

Parameters#

Name	Type	Required	Default	What it is	Constraints
`cursor`	string	yes	(required)	Replies continuation token from a comment thread	max 255 chars; must match `[A-Za-z0-9_\-=%.~+/]{1,255}`; trimmed

Request#

curl "https://api.onekey.dev/v1/youtube/comment_replies?cursor=Eg0SC2RRdzR3OVdnWGNRGAYyJSIRIgtkUXc0dzlXZ1hjUTAAeAJCEGNvbW1lbnRzLXNlY3Rpb24%253D" \
  -H "x-api-key: YOUR_API_KEY"

Try it

Add your key to run this call right here. No key? Get one free. The key stays in this tab.

Recorded response#

A real YouTube response, recorded and returned in Onekey's shape. Fields the platform does not provide are null.

json

{
  "success": true,
  "data": [
    {
      "content": {
        "id": "id0290",
        "text": "example content.text 0"
      },
      "ext": {
        "publishedText": "example content.publishedText 0",
        "likesText": "example engagement.likesText 0"
      },
      "author": {
        "id": "id0548",
        "displayName": "example author.displayName 0",
        "avatarUrl": "https://example.com/author/avatarurl/0",
        "verified": true
      },
      "engagement": {
        "comments": 100
      }
    },
    {
      "content": {
        "id": "id1290",
        "text": "example content.text 1"
      },
      "ext": {
        "publishedText": "example content.publishedText 1",
        "likesText": "example engagement.likesText 1"
      },
      "author": {
        "id": "id1548",
        "displayName": "example author.displayName 1",
        "avatarUrl": "https://example.com/author/avatarurl/1",
        "verified": true
      },
      "engagement": {
        "comments": 101
      }
    }
  ],
  "metadata": {
    "platform": "youtube",
    "endpoint": "comment_replies",
    "cached": false,
    "stale": false,
    "age_s": 0,
    "fetched_at": "2026-01-01T12:00:00+00:00",
    "credits_charged": 2,
    "request_id": "7f3a9c2e5b1d4c8fa2e6d0b9c4f18e37"
  },
  "error": null
}

Field mapping#

How this endpoint's source fields become Onekey's unified schema. Fields the source lacks come back as null.

Source path	Onekey field	Transform
`payload.commentEntityPayload.properties.commentId`	`content.id`	-
`payload.commentEntityPayload.properties.content.content`	`content.text`	-
`payload.commentEntityPayload.properties.publishedTime`	`ext.publishedText`	-
`payload.commentEntityPayload.author.channelId`	`author.id`	-
`payload.commentEntityPayload.author.displayName`	`author.displayName`	-
`payload.commentEntityPayload.author.avatarThumbnailUrl`	`author.avatarUrl`	`safeUrl`
`payload.commentEntityPayload.author.isVerified`	`author.verified`	`toBoolean`
`payload.commentEntityPayload.toolbar.likeCountNotliked`	`ext.likesText`	-
`payload.commentEntityPayload.toolbar.replyCount`	`engagement.comments`	`toNumber`

Caching and freshness#

Fresh for about 2 minutes. Repeat calls in that window are served from cache and are free.
Between 2 minutes and 15 minutes the cached copy is still served instantly and marked stale: true while Onekey refreshes it in the background.
If the source is down when a refresh is needed, the last copy can be served for up to 1 hour more (marked stale).
A "not found" is remembered for 1 minute and is free.
The cache is shared across all customers, which is what keeps repeat calls cheap.

What can go wrong#

Status	Code	What to do
401	`unauthorized`	Check the `x-api-key` header.
402	`insufficient_credits`	Add credits; your balance must cover the price.
404	`not_found`	Unknown endpoint path.
422	`invalid_params`	Fix the parameters using the table above. Free.
429	`rate_limited`	Wait `Retry-After` seconds, then retry.
502	`upstream_error`	The source failed. Refunded; retry with backoff.

See Errors for the full list and retry guidance.

Status: beta (not yet verified against the live source).