[YukiC0804]

Adds request-for-quote and combo trading to the experimental line, on the outcome + action order model the terminal uses. It targets codex/order-lifecycle-storage, never main.

The plan, venue research and per-phase results are in docs/rfq-combo.md.

Venues

Venue	Taker	Quoter	Combos
Polymarket US	✅	✅	✅
Kalshi	✅	✅	✅ multivariate collections
Polymarket	✅	✅	✅ RFQ-only, Exchange v3 signing
SX Bet	— (no API to request a parlay)	✅ parlays	✅

Limitless Packs (needs partner access), Smarkets, Betfair, Opinion, Hyperliquid and predict.fun are out of scope. The doc gives the reasons.

What's in it

• Models:
  • Rfq, RfqQuote, Combo/ComboLeg, AcceptQuote, MakerQuote, plus status enums.
  • Sizing by contracts or by amount (synpath/trading/money.py).
  • Capability keys rfq_taker, rfq_quoter and combos.
• One typed interface on TradingExchange. Accept side mappings:
  • Kalshi: accepted_side names the maker's bid. Buy YES sends no at 1 − no_bid. This was checked on the Kalshi demo exchange: an accept with no filled as buy YES, 5 @ 0.45.
  • Polymarket US: acceptedSide is the requester's own side.
  • Polymarket: Exchange v3 orders. These are matched byte for byte against EIP-712 vectors built without Synpath code, including the Deposit Wallet's ERC-7739 wrap. CLOB V2 signing is unchanged.
  • SX Bet: quotes are signed orders on the parlay market, expiring before the parlay ends. Void-leg settlement is handled conservatively.
• Engine (engine.rfq):
  • Accept and confirm pass the risk rules (rfq_taker, rfq_quoter, worst_price). The intent is journaled before the venue call.
  • Crash recovery reads the quote back; nothing is sent twice.
  • Fills land in positions. A combo is its own instrument.
  • A side mismatch from the venue raises an alert.
  • Halt cancels open RFQs and quotes under the cancel policy.
  • Incoming RFQs are pushed to quoting callbacks on venues that stream them (Polymarket, SX Bet): about 0.3 ms to the callback in tests.
  • Polymarket RFQs are re-seeded from the journal after a restart.
• serve:
  • /trading/rfqs, /trading/quotes, /trading/combos and /trading/combos/collections.
  • Accept and confirm return 202 at once, or 200 when wait=true and the quote is final.
  • Risk refusals are 409, with the rule.
  • rfq.*, quote.* and combo.saved events on /ws/events.
  • Polymarket US RFQ endpoints are paced at 1 request/s.

Tests

• All offline: mocked HTTP and sockets, plus a paper venue with fake makers.
• Full suite: 3160 passed, 199 skipped (PostgreSQL variants: no test DSN set).

Not verified (phase P10, live, announced to Yuki before each run)

• Kalshi quoter collateral: a demo quote was refused with insufficient_balance.
• Size fields on target-cost RFQs.
• Combo quota behaviour.
• Polymarket US error bodies and last-look lapse status.
• Polymarket v3 acceptance window and fees.
• SX Bet parlay timing and void settlement.

Each venue's checklist is in the doc.