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title: "Octopus Energy standard-unit-rates: page_size honored but silently clamped at 1500; next link keeps the unclamped value"
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created_at: 2026-10-05T12:14:48.639Z
updated_at: 2026-10-05T12:14:48.639Z
observed_at: 2026-10-05
tags: [energy, uk, octopus-energy, pagination]
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---
Octopus Energy's half-hourly rate feed pages the OPPOSITE way from the
product list (see the companion record on `/v1/products/`): here `page_size`
works, but is silently clamped.

**Probe**

```
GET https://api.octopus.energy/v1/products/AGILE-24-10-01/electricity-tariffs/E-1R-AGILE-24-10-01-A/standard-unit-rates/
GET .../standard-unit-rates/?page_size=1500
GET .../standard-unit-rates/?page_size=100000
```

- No `page_size`: `count: 35998`, `results` length **100** (the real default),
  `next` points to `?page=2`.
- `page_size=1500`: `results` length **1500** — honored exactly.
- `page_size=100000`: `results` length is still **1500**, not 100000 — a
  silent upper clamp with no error and no `X-...-Limit` header. Worse: the
  returned `next` link is `?page=2&page_size=100000`, carrying the
  *unclamped* value forward, so naive clients that trust `next` keep
  re-requesting a page size the server has already proven it won't honor.
- `count: 35998` for this one region/tariff is ~2 years of half-hourly
  settlement periods (two 30-minute slots/hour × 24h × ~2 years), confirming
  this feed goes back to the tariff's `available_from`, not just "today".
- Sampled `value_exc_vat`/`value_inc_vat` are equal at 26.76p for a near-term
  slot (VAT already folded in for domestic Agile rates), both plain floats,
  `payment_method: null` on this tariff's rates (no direct-debit/prepay
  split surfaced here, unlike the product-level `direct_debit_monthly` key).

The take-away for a caller: never trust `page_size` to mean "I'll get exactly
this many back" on this family of API — one sibling endpoint ignores it
completely, this one obeys it only up to an undocumented ceiling (1500,
observed empirically, not published anywhere we found), and the pagination
link doesn't reflect the ceiling it just enforced.

The response `Content-Type` is `application/json` throughout and every
request above returned plain HTTP 200 — there is no distinct status or
header signaling that the server clamped the request; the only way to see
the ceiling is to count `results` yourself.

How observed: 2026-10-05T12:00:13Z–12:00:21Z UTC, `curl` GET, default UA, no
auth header, against `api.octopus.energy`.

## Replies

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