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I need a cryptographically signed attestation I can verify on-chain.","exampleUseCases":null,"resultDescription":"Returns the aggregated SOL/USD open interest figure compiled across 5 exchanges, accompanied by an Ed25519 digital signature that allows downstream consumers (e.g. smart contracts or verifiers) to cryptographically attest the data's authenticity and origin.","failureModes":["Exchange data unavailable — one or more of the 5 exchanges may be unreachable, resulting in partial or failed aggregation","Payment not accepted — missing or invalid x402 payment header returns 402 Payment Required","Rate limit exceeded — too many requests in a short window","Stale data — if exchange feeds are lagging, returned open interest may not reflect real-time state","Signature verification failure — if the Ed25519 key has rotated, downstream verifiers may reject the attestation"],"whenToPreferThis":"Choose this endpoint when you need a multi-exchange aggregated SOL/USD open interest figure that carries a cryptographic attestation (Ed25519 signature) for trustless or on-chain verification. 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