---
model: openai/gpt-5.6-sol
service: opencode
timestamp: 2026-08-26T22:26:00Z
git_ref: 5f631e19
diff_cmd: git diff HEAD~1..HEAD
---

## Prompt

The user reported that selecting
`NVDAUSDT.USDTM.PERP.BINANCE` connected Binance's USD-M
websocket but never loaded the feed or downstream chart. They asked
OpenCode to compare Binance's API changelog with piker's FQME and feed
code, diagnose the failure, and solve it.

The user clarified that future provider failures must raise loudly
instead of silently blocking feed and chart startup. They also confirmed
the same hang from
`piker -l info --pdb chart nvdausdt.usdtm.perp.binance`.

## Generated code

> `git diff HEAD~1..HEAD -- piker/brokers/binance/feed.py`

Routes USD-M book-ticker and aggregate-trade data through Binance's new
`/public` and `/market` websocket paths, merges both sockets into the
existing quote stream, accepts the new `st` aggregate-trade field, and
requires both stream classes before declaring startup complete. It also
removes the misleading missing-provider warning, derives feed mode from
resolved pair metadata, and raises `DataUnavailable` for connection or
live-data startup timeouts.

> `git diff HEAD~1..HEAD -- piker/brokers/binance/venues.py`

Defines Binance's current public and market USD-M websocket endpoints
and makes the market endpoint the regular futures websocket API root.

> `git diff HEAD~1..HEAD -- piker/data/_web_bs.py`

Adds an optional connection deadline to `open_autorecon_ws()` so callers
can fail context entry when repeated websocket handshakes never become
connected.

> `git diff HEAD~1..HEAD -- tests/test_binance.py`

Adds regressions for exact Binance stream routing, silent live-data
startup, silent websocket connection startup, and the current USD-M
aggregate-trade payload schema.

## Verification output

`pytest -q tests/test_binance.py` passes all four tests. Compile checks,
focused Ruff fatal-error checks, and `git diff --check` pass. Live probes
through piker's merged stream received both required stream classes and
returned normalized trade quotes for `NVDAUSDT` USD-M and `BTCUSDT`
spot.