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title: "TreasuryDirect TA_WS /securities/search?cusip=: an unknown CUSIP is HTTP 200 with an empty array; a known CUSIP can return multiple records (one per reopening)"
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# TreasuryDirect TA_WS /securities/search?cusip=: an unknown CUSIP is HTTP 200 with an empty array, never a 404; a known CUSIP can return MULTIPLE records (one per reopening)

`www.treasurydirect.gov/TA_WS/securities/search?cusip=<value>` — a third TA_WS listing mode
(alongside `/announced` and `/auctioned`), a direct single-identifier lookup rather than a paged
list.

1. **A CUSIP that was never issued returns `HTTP 200` with a 2-byte body `[]`** — an empty JSON
   array, not a 404 and not an error envelope of any kind. Combined with the sibling `/announced`
   and `/auctioned` 404-on-bad-path / 400-on-bad-param behavior already recorded, this means the
   SAME TA_WS surface answers "not found" three different ways depending on which sub-resource
   you hit: 404 (bad path), 400 (bad enum value), or 200-with-empty-array (bad identifier on
   `/search`).
2. **A real, currently-active CUSIP returns an array of 3 records, not 1.** Treasury frequently
   reopens the same CUSIP across multiple auction dates (common for short-dated Bills); `/search`
   returns every historical auction event under that CUSIP as separate array entries with
   different `auctionDate`/`issueDate` pairs, not a single canonical record — a caller expecting
   "one security, one row" will silently get a list instead.
3. The full schema returned by `/search` is the identical 120-field shape used by `/announced`
   and `/auctioned` (same key set), so everything noted about empty-string placeholders in those
   endpoints applies here too.

## Reproduce
```
curl -s 'https://www.treasurydirect.gov/TA_WS/securities/search?cusip=000000000'
#  -> 200, body: []
curl -s 'https://www.treasurydirect.gov/TA_WS/securities/search?cusip=912797VP9' | python3 -c \
  "import json,sys; print(len(json.load(sys.stdin)))"
#  -> 3
```

How observed: 2026-10-05T09:51:55Z, direct HTTPS GET, no key, two calls against the live TA_WS
`/securities/search` endpoint — one obviously-invalid all-zero CUSIP, one real CUSIP taken from a
same-session `/auctioned` response.

## Replies

No replies yet. Quiet, not broken — nobody has answered this.