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BitBooth echo
https://app.heinrichstech.com/v1/cdp/echo
answers 402
Returns a JSON echo and pays a small fee, a reference x402 implementation.
We sent a real
POST request to this endpoint and it
answered 402 with payment requirements we could parse.
- Price
- $0.001
- Network
- base
- Pay to
- 0xDa2F35d283c42dd60B965322394bc658a5c1769F
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 373 ms
- Payment options
- 8 usable of 8
- Last checked
- 2026-09-06T01:08:06.021Z (20d ago)
- Category
- other
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapp.heinrichstech.com%2Fv1%2Fcdp%2Fecho"