Myriad `claimWinnings` (`POST /markets/claim`) spec capability not implemented in `MyriadExchange` or either SDK

[realfishsam]

Gap

The Myriad API spec defines POST /markets/claim which retrieves a trade claim and the transaction calldata needed to claim winnings for a resolved market. MyriadExchange in core has no claimWinnings() method and neither SDK exposes a wrapper. Without this method, users who traded on Myriad markets cannot retrieve their winnings through the PMXT interface — they must go directly to the Myriad API or frontend.

Core

Spec: core/specs/myriad/myriad.yaml line 799:

/markets/claim:
  post:
    description: Get a trade claim and transaction calldata for a specific market.
    # Request: { marketId, tradeType }
    # tradeType enum: [claim_winnings, claim_voided]
    # Response: claim object with transaction calldata for on-chain settlement

The response contains on-chain transaction calldata that the user must submit to finalize their payout.

core/src/exchanges/myriad/index.ts — MyriadExchange public interface includes fetchMarketsImpl, fetchEventsImpl, fetchOHLCV, fetchOrderBook, fetchTrades, fetchMyTrades, createOrder, cancelOrder, fetchOrder, fetchOpenOrders, fetchPositions, fetchBalance, watchOrderBook, watchTrades, close. No claimWinnings() method exists.

TypeScript SDK

Missing — no claimWinnings in sdks/typescript/pmxt/client.ts. The Myriad SDK class inherits only the methods exposed by MyriadExchange.

Python SDK

Missing — no claim_winnings in sdks/python/pmxt/client.py or sdks/python/pmxt/_exchanges.py.

Evidence

# Spec defines the endpoint
grep -n "claim" core/specs/myriad/myriad.yaml
# line 799: /markets/claim
# line 829: enum: [claim_winnings, claim_voided]

# Core exchange — no implementation
grep -rn "claimWinnings\|claim_winnings" core/src/exchanges/myriad/
# (no matches)

# Both SDKs — no wrapper
grep -rn "claimWinnings\|claim_winnings" sdks/
# (no matches)

Impact

Myriad markets settle on-chain. When a market resolves, winning positions must be claimed explicitly via a signed transaction before funds are released. Without claimWinnings() (or an equivalent buildClaimTx() / submitClaim() pair), users who traded on Myriad through PMXT cannot close the settlement loop using the same SDK — they must switch to the raw Myriad API or UI to collect winnings. This breaks the unified trading workflow for Myriad and leaves funds inaccessible through the SDK.

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Found by automated Core-to-SDK surface coverage audit