the402 endpoint detail

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api.usenami.io perp oi-delta

https://api.usenami.io/v1/perp/oi-delta

payable

Open-interest delta for one crypto perpetual on one venue — current OI against OI N hours ago. Accumulation or distribution signal: whether positioning is building or unwinding.

We sent a real GET request to this endpoint and it answered 402 with payment requirements we could parse.
Price
$0.003
Network
base
Pay to
0x1538726707212F4dB3EB67cEc0910422A310475c
Spec dialect
v2 (declares x402Version 2)
Transport
PAYMENT-REQUIRED header
HTTP method
GET
Response latency
241 ms
Payment options
1 usable of 1
Last checked
2026-08-10T09:14:47.106Z (1d ago)
Category
other

Re-check it yourself:
curl "https://api.the402.dev/validate?url=https%3A%2F%2Fapi.usenami.io%2Fv1%2Fperp%2Foi-delta"