{"slug":"api-usenami-io-v1-perp-basis-ccc777","title":"Per-venue basis for one crypto perpetual — mark versus index price, basis_bps = ","host":"api.usenami.io","method":"GET","resource":"https://api.usenami.io/v1/perp/basis","category":"market","description":"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. `ve","price_listed":0.005,"price_asked":null,"state":"effects","state_label":"Not tested: has real-world effects","checks_7d":0,"answered_7d":0,"latency_ms_median":null,"reported_calls_30d":3,"reported_payers_30d":1,"networks":["eip155:8453"],"badge":"unverified","paid_checks_7d":0,"paid_ok_7d":0,"example_input":{"method":"GET","queryParams":{"canonical_id":{"description":"Disambiguates a ticker that names two unrelated assets; a 409 on the ticker alone names the candidates.","required":false,"type":"string"},"ticker":{"description":"Base ticker (e.g. BTC, ETH). Required.","required":true,"type":"string"}},"type":"http"},"output_schema":{"$schema":"https://json-schema.org/draft/2020-12/schema","properties":{"input":{"properties":{"method":{"type":"string"},"type":{"type":"string"}},"required":["type","method"],"type":"object"}},"required":["input"],"type":"object"},"history":[],"description_full":"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.","last_updated":"2026-09-12T19:57:24.862Z","schemes":["exact"]}