API reference
YouTube Video Thumbnails API
A video's thumbnail set from the snippet, plus conventional i.ytimg.com URLs for every size.
Endpoint
/v1/youtube/video/thumbnailslive · proven1 creditParameters
Query parameters
| Name | Required | Description | Example |
|---|---|---|---|
url | yes | Video URL or a bare 11-char video id | https://www.youtube.com/watch?v=9bZkp7q19f0 |
dry_run | no | Read a zero-credit estimate without fetching sources, running AI, or reserving credits. Cache status is a snapshot, not a guarantee at execution. | 1 |
judgments | no | Add bounded AI labels to eligible returned records (default on). off preserves the original data shape. Unclassified records remain present; labels depend on evidence, time, capacity and the existing request budget. No label surcharge. | on |
label | no | Set none to disable labels; default enables the endpoint’s label set. Equivalent to judgments=off. | none |
label_evidence | no | Include exact supporting sentences and zero-based sentence indexes when a label has validated evidence. No extra charge or change to decisions. | 1 |
exclude | no | Optionally remove confidently labelled engagement bait. Uncertain and unclassified records stay; removed IDs and an owner-bound recall reference are returned. | engagement_bait |
fit | no | Use goal to replace confidently irrelevant records with recall stubs. Keeps first, last, relevant and uncertain records; preserves order. Full evidence is stored for 24 hours when available. | goal |
goal | no | Required with fit=goal: describe the task in at most 600 characters. Supplied text is task context, never permission to act on posts. | Find concrete product complaints |
tokens | no | Optional soft response target for fit=goal, 256–32000. Safety and evidence retention take priority, so the returned result may exceed it. | 4000 |
Examples
Make the request
curl "https://www.monocrawl.com/v1/youtube/video/thumbnails?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D9bZkp7q19f0" \ -H "x-api-key: mn_your_key_here"
TypeScript
const key = process.env.MONOCRAWL_API_KEY;
if (!key) throw new Error('Set MONOCRAWL_API_KEY on your server.');
const res = await fetch(
"https://www.monocrawl.com/v1/youtube/video/thumbnails?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D9bZkp7q19f0",
{ headers: { "x-api-key": key } },
);
const body = await res.json();
if (!body.success) {
// one error shape for every endpoint — see /docs/errors
throw new Error(`${body.error.type}: ${body.error.message}`);
}
console.log(body.data, "credits left:", body.credits_remaining);Python
import os
import requests
res = requests.get(
"https://www.monocrawl.com/v1/youtube/video/thumbnails?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D9bZkp7q19f0",
headers={"x-api-key": os.environ["MONOCRAWL_API_KEY"]},
timeout=60,
)
body = res.json()
if not body["success"]:
# one error shape for every endpoint — see /docs/errors
raise RuntimeError(f"{body['error']['type']}: {body['error']['message']}")
print(body["data"], "credits left:", body["credits_remaining"])Response
Response fields and example
This example is illustrative, not a captured live response. Variable-cost operations may settle a charge different from the list price below. A successful response puts the platform payload in data and reports the exact credits used, remaining balance, request id and cache status beside it.
{
"success": true,
"platform": "youtube",
"endpoint": "/v1/youtube/video/thumbnails",
"data": {
"_warnings": [
"example"
],
"best_url": "https://example.com/example",
"derived_urls": {
"default": "example",
"high": "example",
"maxres": "example",
"medium": "example",
"standard": "example"
},
"thumbnails": {
"default": {
"height": 0,
"url": "https://example.com/example",
"width": 0
},
"high": {
"height": 0,
"url": "https://example.com/example",
"width": 0
},
"maxres": {
"height": 0,
"url": "https://example.com/example",
"width": 0
},
"medium": {
"height": 0,
"url": "https://example.com/example",
"width": 0
},
"standard": {
"height": 0,
"url": "https://example.com/example",
"width": 0
}
},
"title": "example",
"video_id": "example"
},
"credits_used": 1,
"credits_remaining": 99,
"request_id": "req_…",
"cached": false
}The example is illustrative and shows a documented subset of data. The fields below are optional across supported sources; nullable fields can also be absent. Preserve unknown values and accept additional fields.
Schema basis: observed response shapes, not an exhaustive field specification. See schema coverage and validation limits.
Download the data JSON Schema. Validate response.data, not the whole envelope. A valid shape does not establish that every field or source record was returned.
| Field inside data | Type | Meaning |
|---|---|---|
_warnings | array | null | Optional warnings supplied by this operation. Null means unknown. |
best_url | string | null | Optional best url supplied by this operation. Null means unknown. |
derived_urls | object | null | Optional derived urls supplied by this operation. Null means unknown. |
derived_urls.default | string | null | Optional default supplied by this operation. Null means unknown. |
derived_urls.high | string | null | Optional high supplied by this operation. Null means unknown. |
derived_urls.maxres | string | null | Optional maxres supplied by this operation. Null means unknown. |
derived_urls.medium | string | null | Optional medium supplied by this operation. Null means unknown. |
derived_urls.standard | string | null | Optional standard supplied by this operation. Null means unknown. |
thumbnails | object | null | Optional thumbnails supplied by this operation. Null means unknown. |
thumbnails.default | object | null | Optional default supplied by this operation. Null means unknown. |
thumbnails.default.height | number | null | Optional height supplied by this operation. Null means unknown. |
thumbnails.default.url | string | null | Original source URL when supplied. |
thumbnails.default.width | number | null | Optional width supplied by this operation. Null means unknown. |
thumbnails.high | object | null | Optional high supplied by this operation. Null means unknown. |
thumbnails.high.height | number | null | Optional height supplied by this operation. Null means unknown. |
thumbnails.high.url | string | null | Original source URL when supplied. |
thumbnails.high.width | number | null | Optional width supplied by this operation. Null means unknown. |
thumbnails.maxres | object | null | Optional maxres supplied by this operation. Null means unknown. |
thumbnails.maxres.height | number | null | Optional height supplied by this operation. Null means unknown. |
thumbnails.maxres.url | string | null | Original source URL when supplied. |
thumbnails.maxres.width | number | null | Optional width supplied by this operation. Null means unknown. |
thumbnails.medium | object | null | Optional medium supplied by this operation. Null means unknown. |
thumbnails.medium.height | number | null | Optional height supplied by this operation. Null means unknown. |
thumbnails.medium.url | string | null | Original source URL when supplied. |
thumbnails.medium.width | number | null | Optional width supplied by this operation. Null means unknown. |
thumbnails.standard | object | null | Optional standard supplied by this operation. Null means unknown. |
thumbnails.standard.height | number | null | Optional height supplied by this operation. Null means unknown. |
thumbnails.standard.url | string | null | Original source URL when supplied. |
thumbnails.standard.width | number | null | Optional width supplied by this operation. Null means unknown. |
title | string | null | Source title when supplied. |
video_id | string | null | Optional video id supplied by this operation. Null means unknown. |
Optional fields reviewed from preserved successful responses. Additive fields and source variations remain allowed; validate the fields your workflow requires.
The example is invented and illustrates types only; zero and empty values are not claims about a real result.
Failures use the typed error envelope. A confirmed uncharged or refunded failure reports zero; a pending reconciliation can report an unknown charge. Read credits_used and error.details.billing_status, and keep request_id for recovery. Response contract · Error reference