| What it does | Decision API for typed questions with probabilities
| Book metadata database and API for searching, converting and using ISBN data
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| Stage | Not given
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| Founded | Not given
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| Based in | Not given
| US
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| Pricing model | Freemium
| Freemium
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| Pricing | Free plan available. Paid plans: Basic $10/month (1,000 credits), Pro $20/month (2,000 credits), Max $50/month (5,000 credits). Yearly plans save 20%. About 100 credits cost 1 USD before tax. One-time credit packs available; credits never expire.
| Free: $0/mo with 1,000 Daily Calls; Standard: $5/mo with 5,000 Daily Calls; Pro: $15/mo with 15,000 Daily Calls. Custom plans available.
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| Key features | - Three answer types: Noul (yes/no probability), Choice (select one of named options), Score (place on ordered scale)
- Up to 6 questions per request in one round trip
- Returns probability for every option, not just the selected one
- Support for TypeSafe SDKs by changing base URL
- State up to 60,000 characters (string, JSON object, or array)
- 2 to 8 options per Choice question
- 2 to 10 levels per Score question
- Accessible API playground for testing
- Failed calls and validation errors do not consume credits
| - REST and GraphQL API
- ISBN validation and conversion
- Multiple response formats: JSON-LD, JSON and CSV
- OpenAPI and Swagger documentation
- Official client libraries for PHP, Python, TypeScript/JavaScript and Go
- Catalog of 102.1M book editions
- Groups every edition of a book together
- Comprehensive book data: ISBN-10, ISBN-13, EAN, ASIN, title, authors, publishers
- Author information including names, birth and death dates, biography and photos
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| What makes it different | - Independent service from TypeSafe with separate API keys and dashboard
- Simple structured API returning only the decision type you ask for, not text generation
- Transparent billing: 1 credit per decision call with no per-token charges
- All questions share one state in a single request for code simplicity
- TypeSafe's System One model available without TypeSafe account
| - One consistent schema for every book keyed by ISBN
- Catalog of 102.1M book editions
- ISBN validation and conversion for any valid ISBN, not just books in the catalog
- Suitable for beginner, intermediate and advanced users
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 1 ● no change since last check | 4 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 1 |
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| Citation Flow (Majestic) | 18 | 32 |
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| Referring domains (Majestic) | 2 | 6 |
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Jev API