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api.aventtech.com validate isbn
https://api.aventtech.com/validate/isbn
payable
ISBN validation: ISBN-10 and ISBN-13 check digits, with automatic ISBN-10 to ISBN-13 conversion for valid inputs.
We sent a real
GET request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.002
- Network
- base
- Pay to
- 0x5100a134d768415cc4a25d7bdbcfc44394d62282
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- GET
- Response latency
- 5 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:14:24.878Z (1d ago)
- Category
- other
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.aventtech.com%2Fvalidate%2Fisbn"