← All endpoints
sovereign-x402-zeta.vercel.app sequence harmonic
https://sovereign-x402-zeta.vercel.app/api/v1/sequence/harmonic
answers 402
Generate a list of harmonic numbers (1 + 1/2 + ... + 1/n) up to a specified limit n.
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
- 0x41595e02275629126aD11551E39ee9Ac8531Ad3C
- Spec dialect
- v2 (declares x402Version 2)
- Transport
- PAYMENT-REQUIRED header
- HTTP method
- POST
- Response latency
- 71 ms
- Payment options
- 1 usable of 1
- Last checked
- 2026-09-06T01:22:10.529Z (21d ago)
- Category
- ai-inference
Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fsovereign-x402-zeta.vercel.app%2Fapi%2Fv1%2Fsequence%2Fharmonic"