SparkPost email (illustrative Starter overage)
$0.001 / email
API prices
The billing unit sits next to the rate, so a per-message price is not mixed with a per-minute one.
SparkPost
Email delivery API with plan packages and per-thousand overage list rates.
Speechmatics
Multilingual speech-to-text API with published per-hour batch and realtime model rates.
Speechmatics Melia 1 batch transcription
$0.004 / audio minute
Speechmatics Standard batch transcription
$0.0075 / audio minute
Stability AI
Stable Diffusion image APIs billed per generation credit or image.
Stability Stable Image Core (illustrative)
$0.03 / generated image
Statsig
Experimentation and feature platform with published Pro metered-event overage rates.
Statsig Pro metered events overage
$0.00005 / metered event
Stripe
Payment infrastructure priced mainly as a percentage plus fixed fee.
Stripe online card payment (illustrative fixed fee only)
$0.3 / successful charge (fixed fee portion)
Stytch
Auth platform with published SSO/SCIM connection and fingerprint overage rates.
Stytch SSO/SCIM connection
$125.00 / SSO or SCIM connection-month
Stytch fraud fingerprint
$0.005 / fingerprint (fraud add-on)
Tavily
AI search API for agents with published pay-as-you-go credit rates.
Tavily search credit (pay-as-you-go)
$0.008 / API credit
Telnyx
Wholesale messaging and voice APIs with public US SMS list rates.
Telnyx SMS outbound (US local / 10DLC base)
$0.004 / outbound SMS message part
Textmagic
Business SMS and email with a flat public US per-SMS credit rate.
Textmagic SMS outbound (US)
$0.049 / outbound SMS message part
Together AI
Open-model serverless inference, image, audio, and dedicated GPU endpoints.
Together Whisper Large v3 transcription
$0.0015 / audio minute
Together Kokoro TTS characters
$0.000004 / character