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port-scanner.underscoredone.com scan
https://port-scanner.underscoredone.com/scan
answers 402
Give this API a hostname or IP address and it tries connecting to each port in your requested range. For every port that answers it reports whether it is open or blocked, which service is likely running there (a web server, SSH), and what software version was detected. Saves you installing network tools, parsing command-line output, or writing socket loops. Only scan hosts you own or have permissi
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.01
- Network
- base
- Pay to
- 0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 151 ms
- Payment options
- 2 usable of 2
- Last checked
- 2026-09-06T01:07:53.988Z (30d ago)
- Category
- finance-crypto
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fport-scanner.underscoredone.com%2Fscan"