YouTube comment replies API

YouTube Comment Replies API

Fetch public replies under one YouTube comment. Use the parent comment id from the comments API, then page through replies with nextCursor.

Input: Post URL and comment id. Returns: a page of results with a cursor for the next, in YouTube's own field names. Price: 1 credit per call; failed reads are free.

Try this API Read reference

GET /v1/youtube/comment-replies Post URL and comment id · Cursor page

Illustrative response

GET /v1/youtube/comment-replies

Parameters continuation_token=Eg0SC2RRd3c5V2dYY1Elimit=20

Each call1 credit

Retrieval failurefree

{
  "success": true,
  "available": true,
  "creditsCharged": 1,
  "data": {
    "replies": [
      {
        "author": "public_replier",
        "text": "This answers the question in the parent thread.",
        "likes": 42,
        "replyCount": 0
      }
    ],
    "replyCount": 1,
    "fetchedAt": "2026-08-28T09:41:44Z"
  }
}

Key fields shown · full response below

See it in action

Try it with sample parameters.

Call the comments API first, take the replyCursor of a comment with replies, then pass it here as continuation_token to page through that thread.

Try this API live

Pick a sample input

Start from a valid shape, then replace the sample value with your public target.

Selected continuation_token=Eg0SC2RRd3c5V2dYY1E Open

Preview the request

Use a server-side key and send parameters as query values.

GET https://api.sourcevine.io/v1/youtube/comment-replies

curl -G 'https://api.sourcevine.io/v1/youtube/comment-replies' \
  -H 'Authorization: Bearer sv_live_...' \
  --data-urlencode 'continuation_token=Eg0SC2RRd3c5V2dYY1E' \
  --data-urlencode 'limit=20'

const params = new URLSearchParams({
  "continuation_token": "Eg0SC2RRd3c5V2dYY1E",
  "limit": "20",
});

const res = await fetch('https://api.sourcevine.io/v1/youtube/comment-replies?' + params, {
  headers: { Authorization: 'Bearer sv_live_...' },
});

const body = await res.json();
console.log(body.data);

import requests

r = requests.get(
    "https://api.sourcevine.io/v1/youtube/comment-replies",
    params={"continuation_token": "Eg0SC2RRd3c5V2dYY1E", "limit": "20"},
    headers={"Authorization": "Bearer sv_live_..."},
)

body = r.json()
print(body["data"])

Replays the recorded response. Nothing leaves your browser.

Read the response

Every success includes availability, a fetch timestamp and billing context.

GET /v1/youtube/comment-replies Not run

Hit Show sample response to see the response.

A real YouTube Comment Replies API response, recorded against the public target above.

available 1 credit recorded

Replies0

Cost1 credit

{
  "data": {
    "cached": false,
    "replies": [],
    "commentId": "Eg0SC2RRd3c5V2dYY1E",
    "fetchedAt": "2026-09-02T07:58:11Z",
    "nextCursor": null,
    "replyCount": 0,
    "cacheAgeSeconds": null,
    "sourceTimestamp": null
  },
  "success": true,
  "available": true
}

Ship it anywhere

Use this API from code, no-code tools, MCP clients and agents.

We build and maintain theseFirst-party surfaces, versioned with the API.

HTTP Any backend, worker or cron job

Works anywhere that can make an HTTP requestNo plugin to install, and none to wait for.

Make HTTP → Make a request Zapier Webhooks by Zapier → Custom Request n8n HTTP Request node Agents Scoped reads for a tool-using model

Response

Response fields.

Each response includes typed availability, a fetch timestamp, and only the public fields this API promises.

Field	Type	Meaning
commentId	string	The parent comment id you requested.
replies	array	Public replies under that parent comment.
replies[].commentId	string	Platform reply id.
replies[].author	string \| null	Public username only. No profile bio or contact fields.
replies[].likes	integer \| null	Reply like count when the platform reports it.
nextCursor	string \| null	Pass as cursor to request the next page of replies.
fetchedAt	ISO datetime	When Sourcevine read the public page.
sourceTimestamp	ISO datetime \| null	The platform timestamp when it is available.
cached	boolean	True when this answer repeats an identical request made moments earlier.
cacheAgeSeconds	integer	Seconds since the reading was taken.
replyCount	integer

Request flow

How a request is handled.

01 Send the parameters
Send continuation_token. The endpoint validates missing parameters before fetching data.
02 Checked
A missing parameter is refused before any fetch, and not charged.
03 Read
The public data is read when you call. An identical request moments earlier is answered again, free.
04 Typed availability
Deleted, private and unsupported resources return explicit statuses, so clients can stop retrying facts about the world.
05 JSON back
YouTube names stay intact, so your code reads subscriberCount instead of reverse-engineering a generic schema.

fetchedAtcreditsChargedavailable

Every response carries fetchedAt and the platform timestamp, so you know how old a reading is before you act on it. YouTube Comment Replies API fits recurring comment replies checks in dashboards, spreadsheets, workflows and agents.

Boundaries

What this API does not return.

No contact or bio fields
Bios, email addresses, phone numbers, postal addresses and messenger handles are outside the response contract.
No private data
Private accounts, restricted content and unavailable resources return typed availability instead of guessed data.
No full thread discovery
This endpoint reads replies for a known parent comment. Use the comments API first when you need to discover parent comments.

Use cases

Where teams use YouTube Comment Replies API.

Community QA

Inspect reply threads attached to high-signal public comments without scraping page HTML.

Campaign support

Follow questions under a sponsored post and route unresolved threads to a support queue.

Moderation review

Pull public replies for known parent comments and preserve the request id for audit.

Conversation datasets

Build bounded reply samples with typed pagination and no profile bio fields.

Pricing

1 credit per call, and nothing for a failed read.

The response and X-Credits-Charged header tell you what happened, including when it is zero.

Charged1 credit

AnsweredThe public data came back.
Not found or privateThe lookup was made, and that is the answer. The response says which.
Empty resultThe lookup was made and found nothing to return, such as an account with no posts.

Not charged0 credits

Failure on our sideA timeout or a read we could not complete.
Unsupported URLThe wrong kind of URL: refused before any fetch.
Cache hitAn identical request moments earlier, answered again.

FAQ

Common questions.

What does YouTube Comment Replies API return?

Fetch public replies under one YouTube comment. Use the parent comment id from the comments API, then page through replies with nextCursor.

How is it billed?

A call costs 1 credit, including an empty result. Retrieval failures are not charged.

What happens when the resource is private or deleted?

The request returns available=false with a typed availability status. Not-found and private results are charged like any lookup; unsupported URLs and retrieval failures are not.

Does Sourcevine return contact data?

No. Bios, emails, phone numbers, postal addresses and private or restricted content are outside the public response contract.

Do I need to log in to YouTube?

No. Your integration authenticates with a Sourcevine API key. You do not need to supply YouTube credentials or a session.

YouTube Comment Replies API

Try it with sample parameters.

Pick a sample input

Preview the request

Read the response

Use this API from code, no-code tools, MCP clients and agents.

Response fields.

How a request is handled.

What this API does not return.

Where teams use YouTube Comment Replies API.

Community QA

Campaign support

Moderation review

Conversation datasets

1 credit per call, and nothing for a failed read.

Common questions.

What does YouTube Comment Replies API return?

How is it billed?

What happens when the resource is private or deleted?

Does Sourcevine return contact data?

Do I need to log in to YouTube?

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