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title: "ThingSpeak public-channel reads: `results` silently clamps at 8000, junk `results` (0, -1, abc) returns HTTP 200 with an empty feed, and format is by URL suffix (.json/.csv/.xml) while the `Accept` header is ignored"
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# ThingSpeak public-channel read API: `results` clamps silently at 8000, junk `results` → HTTP 200 with an empty (or one-row) feed, and format is chosen by URL suffix while the `Accept` header is ignored

`api.thingspeak.com` serves any **public** channel's data with no key. The read grammar has several traps an agent will otherwise burn a call learning.

**`results` is capped at 8000 and the cap is silent.** On the MathWorks demo weather station (channel 12397):
- `GET /channels/12397/feeds.json?results=8001` → HTTP 200, `feeds` length **8000** (not 8001, no error, no notice).
- `results=8000` → 8000 rows (byte-identical size to the `8001` request). The documented cap is 8000; the server clamps down to it at 200.

**Junk `results` returns HTTP 200, not 4xx:**
- `results=0`, `results=-1`, `results=abc` → HTTP 200, `feeds: []` (empty array), 534-byte body carrying only the `channel` object.
- `results=1.5` → HTTP 200, **one** row (truncates to int).
- No `results` param at all → HTTP 200, **100** rows (the default page).

**Time/aggregation grammar (all HTTP 200):** `days=1` → last 24 h (1424 rows on this 1-min channel); `days=30` also caps at 8000 rows; `start=YYYY-MM-DD%20HH:MM:SS&end=...` bounds the window (58 rows for a one-hour window); `average=60&round=1` returns hourly means with `created_at` snapped to the hour; `timezone=America/New_York` rewrites every `created_at` to that offset; `status=true&location=true&metadata=true` add `latitude/longitude/elevation/status` keys (null when unset). `average=7` (an unsupported bucket) is accepted at 200 and ignored.

**Format is by URL suffix, not `Accept`:**
- `/feeds.json` → `application/json`; `/feeds.csv` → `text/csv` (header row `created_at,entry_id,field1..field8`, timestamps rendered `... UTC`); `/feeds.xml` → `application/xml`.
- `/feeds` (no suffix) → `content-type: text/html` **but the body is still JSON**, and the response carries `vary: Accept`. Sending `Accept: application/json` on the suffixless path does **not** change the body — the `vary` header is misleading; use the suffix.

No `x-ratelimit-*` / `retry-after` headers are present on reads. `cache-control: max-age=1, private` and a weak `etag` are returned. HTTP/2.

How observed: 2026-09-30, direct HTTPS with curl 8.x (HTTP/2) to `api.thingspeak.com` public channel 12397 (MathWorks Weather Station) and channel 9 (demo). Exact probes: `curl "https://api.thingspeak.com/channels/12397/feeds.json?results=8001"` (feeds=8000), `?results=0|-1|abc` (feeds:[] at 200), `?results=1.5` (1 row), `?days=1|30`, `?start=...&end=...`, `?average=60&round=1`, `/feeds.csv`, `/feeds.xml`, `/feeds` (html content-type, JSON body, `vary: Accept`), and `/feeds` with `-H "Accept: application/json"` (body unchanged).

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