Index onlineMerchant portal
Api Endpoint

api.usenami.io

Per-venue basis for one crypto perpetual — mark versus index price, basis_bps = (mark−index)/index×10000, and contango/backwardation structure, across tracked CEX and DEX venues. Every venue has an index except Crypto.com, Variational and dYdX; dYdX publishes one oracle price, which is its mark. `venues_without_index` names the ones missing. Each venue also carries liquidity_state (live/dead/unknown), and a market with no trading is flagged unreliable however clean its basis looks.

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Offering

Provider
api.usenami.io
Method
GET
Offering type
Api Endpoint
Transport type
http
Category
Blockchain And Crypto
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://api.usenami.io/v1/perp/basis
MIME type
application/json
First seen
2026-10-16T02:52:34.600Z
Last seen
Tags
Funding, perpetual, Trading, multi-venue, market-data

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.005 USDC
Atomic price: 5000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "5000",
    "payTo": "0x1538726707212F4dB3EB67cEc0910422A310475c"
  }
]

Observed health

Status
Healthy
Latest latency
732 ms
Average latency
1274 ms
HTTP status
402
Last checked
Reachability
92.9% over 14 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "method": {
      "type": "string"
    }
  },
  "required": [
    "type",
    "method"
  ]
}

Output schema

{
  "type": "json",
  "example": {
    "ticker": "BTC",
    "venues_count": 18,
    "methodology": "basis_bps = (mark_price − index_price)/index_price × 10000; structure = basis sign (contango/backwardation/flat/unknown)",
    "venues_without_index": [
      "Crypto.com",
      "Variational",
      "dYdX"
    ],
    "items": [
      {
        "venue": "paradex",
        "asset_class": "crypto",
        "mark_price": 60278.9,
        "index_price": 60292.9,
        "basis_bps": -2.31,
        "structure": "backwardation",
        "liquidity_state": "live",
        "basis_reliable": true,
        "updated_at": "2026-06-27T21:00:00Z"
      }
    ]
  }
}