{"uid":"cap_EiFb2hqbYcPFf065omSW1","slug":"usenami-perp-basis-77b5d472","name":"Usenami Perp Basis","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. `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.","url":"https://api.usenami.io/v1/perp/basis","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string"},"method":{"type":"string"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_yPqvi0bqJZQ3JTG97s2pB","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns per-venue perpetual futures basis (mark vs index price, basis_bps) and contango/backwardation structure for a given ticker","exampleAgentPrompt":"What's the current perp basis for BTC across all venues — give me the mark vs index price spread in basis points and tell me which venues are in contango vs backwardation.","exampleUseCases":[{"title":"Basis arbitrage opportunity scanner","prompt":"Show me the perp basis in basis points for ETH across all venues right now — I want to see which ones have the widest mark-to-index divergence so I can spot arb opportunities."},{"title":"Contango regime confirmation for carry trade","prompt":"Is SOL perpetual futures currently in contango or backwardation? Give me the basis_bps and the mark vs index breakdown so I can decide whether to run a long cash / short perp carry trade."},{"title":"Cross-venue basis risk monitoring","prompt":"Pull the perp basis for BTC on every venue you have — I need to know where basis_bps is abnormally elevated versus the index so I can manage my cross-venue basis risk exposure."}],"resultDescription":"Returns per-venue records for the requested ticker, each containing mark price, index price, basis_bps computed as (mark−index)/index×10000, and a contango or backwardation classification. Venues that do not publish an index price return null for those fields.","failureModes":["Ticker not supported — returns empty or error if the symbol is not tracked","Venue publishes no index price — affected fields returned as null rather than an error","Invalid input schema — missing required type or method fields causes a 400-level rejection","Rate limiting or payment failure via x402 — call rejected if USDC payment is not processed"],"whenToPreferThis":"Use this endpoint when you need to measure the spread between mark and index price on perpetual futures — specifically to compute basis in basis points, assess contango vs backwardation structure, or identify basis risk across venues. Prefer it over a general market snapshot when basis and price-source divergence are the primary signal, and over funding rate endpoints when you need price-level divergence rather than periodic payment rates.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:40:15.988Z","isFirstParty":false}