The base-swap 0x trade as a Cobalt validity transaction: Base includes your signed tx only while your conditions hold — a conditional order with no limit-order contract and nobody holding the trade. We never hold funds or keys; you sign and submit. 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 caller-supplied storage predicate for price.

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