fix(oc): match the Coinbase stable swapper upgrade - #1439
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The stable swapper program dropped its address whitelist and moved to role-based authorities (coinbase/stable-swapper#20). The server side landed in code-payments/ocp-server#257; this brings the client's instruction and account parsing in line. Swap instruction: the `whitelist` account after `user` is gone, so the instruction now carries 15 accounts. The `address_whitelist` PDA derivation and its tests go with it. Every client-built swap (stateful, stateless sweep, USDC->USDF onramp, USDF deposit) used the same `CoinbaseStableSwapperProgram_Swap`, so all four pick this up. Pool account: `operations_authority` was replaced by `pause`, `unpause`, `treasury` and `configure` authorities, which pushes `fee_recipient` from byte 72 to byte 136. The onramp reads this field from chain to pick the fee recipient for USDC->USDF and USDF deposit transactions; at the old offset it would read `treasury_authority` instead. The parser now checks the account discriminator and is covered by the same mainnet fixture ocp-server uses (pool CrDL9SoCyW1tBgn8k7rgGSpWhnszneWDbvKvqPAU4PL9 after the 2026-09-08 MigrateAuthorities instruction). Compute unit limits are unchanged here: the server-driven swaps take the limit from server parameters, and the client-built transactions already set 200_000.
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Client side of code-payments/ocp-server#257. The stable swapper program dropped its address whitelist and moved to role-based authorities (coinbase/stable-swapper#20), which changes both the swap instruction and the pool account layout the app reads.
Swap instruction
The
whitelistaccount afteruseris gone, so the instruction now carries 15 accounts. Theaddress_whitelistPDA derivation and its tests go with it. All four client-built swaps shareCoinbaseStableSwapperProgram_Swap, so the stateful swap, stateless sweep, USDC to USDF onramp, and USDF deposit all pick this up.Pool account
operations_authoritywas replaced bypause,unpause,treasuryandconfigureauthorities. That pushesfee_recipientfrom byte 72 to byte 136. The onramp reads this field from chain to pick the fee recipient for USDC to USDF and USDF deposit transactions, and at the old offset it now readstreasury_authority. The parser reads the new layout, checks the account discriminator, and is covered by the same mainnet fixture ocp-server uses: poolCrDL9SoCyW1tBgn8k7rgGSpWhnszneWDbvKvqPAU4PL9after the 2026-09-08MigrateAuthoritiesinstruction.Compute unit limits
Unchanged here. The server-driven swaps take the limit from server parameters, and the client-built transactions already set
200_000.