Vox API · v1

Speech scoring for your product, behind one Bearer token.

Send learner audio, get back reliable speaking scores and pronunciation feedback. Usage is metered per successful call, so you only pay for what works.

Create an account Read the docs

request

curl https://vox.myspeakingscore.com/v1/score/general \
  -H "Authorization: Bearer $VOX_API_KEY" \
  -F audio=@answer.wav \
  -F prompt="Describe your hometown."

{
  "request_id": "req_8f2c…",
  "overall": 6.5,
  "fluency": 6.0,
  "pronunciation": 7.0
}

Speaking scores

General and IELTS-style scores from a single audio upload.

Pronunciation analysis

Phoneme-level feedback with timestamps and confidence.

Curriculum records

Attach attempts to your own curricula and learner IDs.

Self-serve keys

Create, label and revoke keys. Sandbox keys are never billed.

One plan. Clear overage.

Every account starts on the same plan. Your dashboard shows calls used, remaining allowance and the running total for the current billing month.

What counts as a call?: A successful request with a production key. Errors and sandbox calls are free.
When is overage charged?: At the end of each billing month, on the same invoice.
Can I cancel?: Any time from the billing page. Access continues until the period ends.

Vox API Standard

monthly

$99.00/ month

1,000 API calls included each billing month
$0.02 per call after 1,000
Sandbox keys for free testing
Only successful production calls count

Example: 1,500 calls in a month
= $99.00 + 500 × $0.02
= $109.00

Start with Vox API