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README.md	< 22 hours ago	2.6 kB	0
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TypeScript SDK: Opinion, Metaculus, Smarkets, PolymarketUS exchange classes: These adapters already existed in core/src/exchanges/ and were reachable via the sidecar HTTP API, but the hand-maintained TypeScript SDK client at sdks/typescript/pmxt/client.ts (and the package entry point at sdks/typescript/index.ts) never exposed them. Anyone using pmxtjs would see pmxt.Opinion === undefined even though the core adapter had been merged. All four are now exported and work via the standard new pmxt.Opinion({}).fetchEvents() consumer path.
Python SDK: Smarkets, PolymarketUS exchange classes: Same drift in sdks/python/pmxt/_exchanges.py and sdks/python/pmxt/__init__.py. Both are now exported.
openapi.yaml source_exchange enum: Added kalshi-demo and polymarket_us, which were missing even though the sidecar routes accepted them. The generated openapi-fetch TypeScript SDK would have rejected requests targeting these exchanges at the type layer.

Hand-maintained allowlists across five layers were silently drifting: Every layer that exchanges have to cross to reach a consumer had its own allowlist — generate-openapi.js, sdks/typescript/pmxt/client.ts, sdks/typescript/index.ts, sdks/python/pmxt/_exchanges.py, sdks/python/pmxt/__init__.py. Adding a new exchange to core/src/exchanges/ required manual edits at up to five places and nothing blocked a PR that forgot them. The immediate symptom was that four exchanges (opinion, metaculus, smarkets, polymarket_us) shipped into core but never reached pmxtjs.

New core/scripts/check-exchange-drift.js and .github/workflows/exchange-drift-check.yml: Walks core/src/exchanges/*/index.ts to discover every concrete PredictionMarketExchange subclass, then asserts that each one is exposed by the openapi enum, both TypeScript SDK files, and both Python SDK files. Exits non-zero with a per-layer table of missing entries. Runs on every PR that touches any of the covered files. This makes it structurally impossible to merge a new exchange without wiring it through every layer.