Simple, metered pricing
Free tiers on both APIs with no credit card. Paid plans billed monthly through RapidAPI — no contract, no minimum, cancel any time.
Text to Speech & Speech to Text API
Text to speech, transcription, sound effects, noise removal and voice changing.
- 10,000 characters of speech
- 17 min of transcription
- 2.5 min of audio effects
- 1,000 requests / hour
- 200,000 characters of speech
- 50 hours of transcription
- 125 min of audio effects
- Hard limits — no surprise overage
- 830,000 characters of speech
- 208 hours of transcription
- 542 min of audio effects
- Overage from $0.00025/unit
- 3,475,000 characters of speech
- 867 hours of transcription
- 2,250 min of audio effects
- Best per-unit rate
Universal SERP API
Google and 40+ engines with full page depth, in SerpApi-compatible JSON.
- 150 searches / month
- All 40+ engines
- Full response depth
- 1,000 requests / hour
- 6,000 searches / month
- All 40+ engines
- 1 request / second
- Hard limit — no surprise overage
- 25,000 searches / month
- All 40+ engines
- 1 request / second
- Overage at $0.0032/search
- 70,000 searches / month
- All 40+ engines
- 2 requests / second
- Overage at $0.0025/search
What counts as a unit
| API | What is metered | One unit | Example |
|---|---|---|---|
| Text to speech | Characters of input text | 10 characters | A 66-character sentence costs 7 units |
| Speech to text | Duration of the audio | 5 seconds | A 30-second clip costs 6 units |
| Sound effects & audio | Duration of the output | 5 seconds | A 12-second effect costs 3 units |
| SERP | Searches | 1 search | One request returns the engine's whole first page |
Failed and rejected requests are never billed. Free and Pro plans are hard-limited, so they refuse work rather than charging overage; Ultra and Mega allow overage at the published per-unit rate.
Pricing FAQ
How do I get an API key?
You subscribe on RapidAPI and the key is issued there. Every request is authenticated with your RapidAPI key, so there is no second account to open and no separate credential to rotate. The free tier on both APIs needs no credit card.
Is there really a free tier?
Yes, on both APIs and with no card required. The Voice API gives you 10,000 characters of speech, 17 minutes of transcription and 2.5 minutes of audio effects each month. The SERP API gives you 150 searches a month at full response depth — not a cut-down version.
What happens if I go over my plan?
On the free and Pro plans, nothing: they are hard-limited, so requests are refused rather than billed. Ultra and Mega allow overage at a published per-unit rate, so heavy months keep working. You are never charged for a failed or rejected request.
Can I cancel any time?
Yes. Billing is monthly through RapidAPI with no contract, no minimum and no annual commitment. Cancelling stops the next charge.
Why are you cheaper than going direct?
Two reasons. We buy capacity in volume and resell it in the small increments most projects actually need, and we meter what you consume — characters, seconds, searches — instead of selling fixed tiers sized well above your usage. A dedicated plan that covers 6,000 searches is sold as 15,000, and you pay for all of them.
Do you offer support?
Yes. Every response carries an X-Request-ID; quote it and a failure becomes one row in our logs rather than a guessing game. Reach us through the Contact Provider button on either RapidAPI listing, or at admin@smartapihub.com.