Make any signed Base transaction conditional (Cobalt validity tx): Base includes it only while your conditions hold. We validate the predicates and return the base_sendRawTransactionValidity request; we never touch funds or keys. Every request carries the deadline Base requires (at most 60 s out; set for you if omitted). Optional conditions: fromBlock, flashblockIndex (1-10), minNativeBalanceWei, or a storage predicate for price.

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