API: Bebop Solana quotes are unreachable and unexecutable

[linear]

Context

Found during review of the executable-sell-chain work. Two independent defects on the same path, both pre-dating that branch (introduced with #12502). Bebop's Solana path is the same class of problem CoW Swap was disabled for, but it is still enabled.

1 — the quote can never be reached

bebopApi.getTradeQuote dispatches on the presence of the key, not its value (packages/swapper/src/swappers/BebopSwapper/endpoints.ts:22):

return 'supportsEIP1559' in quoteInput
  ? getBebopTradeQuote(quoteInput, deps)      // evm
  : getBebopSolanaTradeQuote(quoteInput, deps)

getQuote.ts sets supportsEIP1559: false unconditionally on every quote input, so a Solana sell with swapperName: 'Bebop' routes into the EVM implementation and fails. getRates.ts adds the key only for EVM chains (...(isEvmChainId(...) && { supportsEIP1559: false })), so rates and quotes disagree: Bebop can serve a Solana rate that no client can then quote.

Not reproduced live — Bebop returned NoRouteFound / CrossChainNotSupported for the SOL pairs tried during verification, so it never offered a rate to misroute. The mechanism is plain in the code regardless.

Fix is likely to make getQuote mirror getRates and only set supportsEIP1559 for EVM sells, but the dispatch-on-key-presence pattern is the underlying fragility.

2 — even reached, it can't be executed by an API client

BebopSolanaMessageToSign (packages/swapper/src/types.ts:650) notes Bebop broadcasts by submitting the signature to their own API, keyed by the RFQ quoteId. The wire only carries solana_serialized_tx: { serializedTx }, so a partner who signs and broadcasts it directly never settles the order — and the submission would go out under our API key, not theirs.

This is the same defect CoW Swap was removed from ENABLED_SWAPPER_NAMES for.

Work

• Fix the dispatch so Solana quotes reach getBebopSolanaTradeQuote
• Decide the execution story: either an API-side submit step (as CoW will need), or exclude Bebop's Solana routes from /v1/swap/rates so we stop advertising a route no client can complete
• Until one of those lands, the consistent position is to exclude the path rather than serve rates for it