| What it does | GTM data API with 65+ enrichment endpoints behind one key, using REST and MCP with fixed credit pricing
| Book metadata database and API for searching, converting and using ISBN data
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| Stage | Established
| Not given
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| Founded | 2018
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| Based in | EE
| US
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| Pricing model | Freemium
| Freemium
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| Pricing | Sandbox: 100 credits free with no card; Starter: $100 for 5,000 credits; Growth: $450 for 25,000 credits (11% bonus); Scale: $800 for 50,000 credits (25% bonus); Enterprise: Custom pricing; Enrichment Pass: $299/month billed yearly for 50,000 monthly enrichments. Email finder: 5 credits per call; Ph
| 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 | - 65+ data enrichment endpoints
- REST API and MCP server integration
- Multi-provider data routing with waterfall
- Transparent execution logs showing providers tried and costs
- Failed email and phone lookups cost nothing
- Fixed credit pricing with no hidden markups
- Credits that never expire
- Works with Claude, Clay, HubSpot, Zapier, and n8n
- Per-client API keys for agencies
- Company, contact, LinkedIn, and signal data from 40+ providers
| - 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 | - Transparent credit pricing with execution logs showing exactly what was charged and why
- No cost for failed email and phone lookups
- One API key and credit pool for use across REST, MCP, Claude, and multiple platforms without switching
- Built on production infrastructure that has served over 26,000 workspaces since 2018
- No contracts, seat minimums, or platform lock-in required
| - 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) | 10 ▲ +2 (up) since last check | 4 ● no change since last check |
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| Trust Flow (Majestic) | 5 | 1 |
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| Citation Flow (Majestic) | 28 | 32 |
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| Referring domains (Majestic) | 23 | 6 |
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