creatorWallet (shown on GET /launches/{mint}); prepare takes only the config.
Attach a strategy later
A purps.lol coin launched without a strategy can get one afterwards. From then on the whole creator fee goes into it.POST /coins/{mint}/strategy/prepare with config, sign, then POST /coins/{mint}/strategy/submit with the same config, ts and signature. The config in its shortest form is a preset and the markets, { "preset": "balanced", "markets": ["ETH"] }, every market long at 2x. For a short or your own leverage send legs instead of markets; for anything else, the full config. All three forms are on the purps.lol page.
Prepare validates the config first: a malformed one is a 400 that names the field, so you don’t sign anything for nothing. The message carries the strategy in words on a sets: line (the fee split, what profits do, the take-profit and dip-buy rules, the markets) next to its hash. A short form is expanded before the words and the hash are made, so the message describes the full strategy it becomes, and sending the same short form to submit gives the same hash.
Launches from before September 2026 can’t do this: their fee vault is owned by the creator’s wallet on chain and the strategy could never claim from it.