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attester.dev symbol exists
https://attester.dev/v1/symbol/exists
payable
Deterministic symbol existence for PyPI and npm packages: functions, classes, methods, constants with signatures and deprecation flags, extracted from real artifacts. Negative answers include closest matches and signed proof. $0.005 USDC per check.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.005
- Network
- base
- Pay to
- 0x57407D691F755cAa107647718F3582a8A87467dD
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 6238 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-08-10T09:10:31.375Z (1d ago)
- Category
- web-scraping
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fattester.dev%2Fv1%2Fsymbol%2Fexists"