What this API does and who it is for
The YouTube Info & Download API is aimed at developers who need to programmatically retrieve video metadata or obtain downloadable media files from YouTube and other streaming or social media sources. Rather than wrapping a browser automation layer yourself, you hand a URL to this API and get back a structured response with video info or a download link in your chosen format.
Typical integrations include download manager apps, content archival tools, audio extraction pipelines (podcast apps pulling YouTube audio, for example), and quality-selection download UIs where the user picks a resolution before the file is fetched.
Endpoint walkthrough
The API surface is intentionally small — only two endpoints exist:
- GET
/ajax/api.php— Returns information about a video. This is where you would confirm a URL is valid, retrieve available formats and resolutions, get duration, and so on before committing to a download call. - GET
/ajax/download.php— Initiates the actual download or conversion process, returning the media in the requested format.
Authentication is handled via API key, as is standard for RapidAPI-hosted services.
Because there are only two endpoints, the integration surface is narrow. Both calls are plain GET requests, which simplifies client implementation across languages. The main integration complexity is on the billing side — selecting format and quality directly affects cost.
Format support
The API supports a wide range of output formats:
Audio: MP3, M4A, AAC, FLAC, WAV, OGG, OPUS, VORBIS, WEBM
Video: MP4 and MOV at 360p, 480p, 720p, 1080p, 1440p, 4K, and 8K
This breadth is genuinely useful — being able to request FLAC or WAV is a differentiator for audio-quality-sensitive workflows, and 8K support covers archival or professional use cases that most consumer-facing tools do not bother with.
Pricing breakdown
The billing model is usage-based and layered: you subscribe to a plan that sets your monthly unit quota, and each download consumes a number of units derived from the format chosen and the duration of the content.
Plan tiers
| Plan | Monthly cost | Unit quota | Request quota |
|---|---|---|---|
| Basic (Free) | $0 | 500 units/day | 500,000/month |
| Pro | $5 | 100,000 units/month | 500,000/month |
The free tier's daily cap of 500 units is the binding constraint — not the request count. At current per-download prices, 500 units per day translates to a relatively small number of actual downloads depending on format and duration, making the free tier suited to development and testing rather than any production workload.
The Pro plan at $5/month includes 100,000 units. When that quota is exhausted, overage is charged at $0.000047 per unit plus $0.000003 per request, totalling approximately $0.00005 per additional unit. As a reference point provided by the API documentation: 20,000 units over the monthly cap costs roughly $1.
Per-download cost by format
| Format / Quality | Base price per download |
|---|---|
| All audio formats (MP3, AAC, FLAC, WAV, OGG, OPUS, VORBIS, WEBM, M4A) | $0.00030 |
| MP4 / MOV up to 1080p | $0.00030 |
| MP4 / MOV 1440p | $0.00040 |
| MP4 / MOV 4K or 8K | $0.00050 |
Duration multipliers
Each format category has a standard duration limit. Exceeding that limit applies a cost multiplier:
| Duration over standard limit | Multiplier |
|---|---|
| Within standard limit | ×1 (base price) |
| Up to 90 minutes over | ×3 |
| Up to 180 minutes over | ×5 |
| Each additional 90 minutes | +2× (×7, ×9, …) |
Standard limits per format: 4K and 8K cap at 15 minutes, 1440p at 60 minutes, 1080p at 90 minutes, and other formats at 120 minutes.
A concrete example from the documentation: a 4K download of a 30-minute video costs $0.00050 × 3 = $0.00150. A 4K download of a 2-hour video costs $0.00050 × 5 = $0.00250. For high-resolution, long-form content the costs escalate quickly, so it is worth estimating your typical video durations before choosing 4K or 8K as a default.
Practical use cases
Audio extraction at scale: At $0.00030 per MP3, extracting audio from 1,000 YouTube videos costs $0.30 — well within a single Pro plan's included quota if durations stay inside 120 minutes.
Selective resolution download UIs: You can call the info endpoint first to present users with available quality options, then trigger the download endpoint only for the chosen resolution — avoiding wasted spend on formats users do not want.
Archival pipelines: The FLAC and WAV support and the 8K video tier make this viable for high-fidelity archival, though the duration multipliers mean very long 4K content should be budgeted carefully.
Performance and reliability considerations
The reported average latency is 1,655 ms and the average success rate is 94%. For a download API that is reaching out to third-party platforms and performing format conversion, a sub-two-second response to initiate a download is reasonable, though it means synchronous inline responses in a web request/response cycle are inadvisable — fire-and-forget with a callback or polling model is the safer architecture. The 94% success rate is worth factoring into error handling: plan for retries and graceful degradation, especially for social media sources where platform-side availability can fluctuate.
Limitations to check before integrating
- Free tier is development-only in practice. Five hundred units per day is too limited for any user-facing production feature.
- Duration multipliers can surprise you. If your app handles podcasts, lectures, or long-form content that frequently exceeds the standard limits, your effective per-download cost could be three to five times the base rate.
- Only two endpoints. There is no webhook, no batch endpoint, and no explicit status-polling endpoint documented — plan your async handling accordingly.
- Source coverage is described broadly. The API lists YouTube and social media platforms generally; verify specific platforms you depend on are supported before committing to the integration.
- Some API keys may receive discounts and some domains may be free — both are noted in the documentation but the specifics are not detailed publicly, so it is worth checking with the provider if your use case involves high volume from a particular source.
Getting started
The API is available on RapidAPI. Subscribe to the Basic (free) plan to obtain an API key and test both endpoints. Call /ajax/api.php with a target video URL to confirm the response structure, then call /ajax/download.php specifying your target format. For production, the Pro plan at $5/month provides 100,000 units with a clear overage formula, making cost estimation straightforward once you know your average video durations and target formats.
