Stock

5 reads, no writes, on train 2026-11. Scopes: inventory:read.

Operation	Method	Scope	Path
Get allocation matrix	GET	inventory:read	/api/v1/inventory/allocation-matrix
Get forecast accuracy	GET	inventory:read	/api/v1/inventory/forecast-accuracy
One product's position at a warehouse	GET	inventory:read	/api/v1/inventory/position
Stock on hand at each period boundary	GET	inventory:read	/api/v1/inventory/stock-on-hand
Every variant with its stock	GET	inventory:read	/api/v1/inventory/table

Get allocation matrix

GET /api/v1/inventory/allocation-matrix

Scopes: inventory:read

Stock spread across warehouses for the variants requested: the locations as columns, one row per variant, and a cell per pair carrying on-hand quantity, days and weeks of cover and a health word. Built for finding imbalances between sites.

Required	In	What it is
variant_ids	query	Comma-separated list of variant IDs to include in the matrix (max 50, min 1). Always required.

Optional	In	What it is
Tightly-Version	header	The date train to answer on.

curl "https://api.app.tightly.io/api/v1/inventory/allocation-matrix?variant_ids=<variant_ids>" \
  -H "Authorization: Bearer $TIGHTLY_API_KEY"

What it answers

{
  "data": {
    "locations": [
      {
        "location_id": "loc_0004",
        "location_name": "London DC"
      },
      {
        "location_id": "loc_0009",
        "location_name": "Rotterdam DC"
      }
    ],
    "variants": [
      {
        "cells": [
          {
            "days_of_cover": 18,
            "health": "caution",
            "location_id": "loc_0004",
            "on_hand": 302,
            "weeks_of_cover": 2.6
          },
          {
            "days_of_cover": 0,
            "health": "critical",
            "location_id": "loc_0009",
            "on_hand": 0,
            "weeks_of_cover": 0
          }
        ],
        "product_id": "4410092",
        "sku": "TB-CREW-BLK-M",
        "variant_id": "44100920011",
        "variant_title": "Black / M"
      }
    ]
  },
  "message": {
    "desc": "",
    "service": "inventory"
    …
  }
}

What it refuses

• 400 Bad Request - missing or invalid variant_ids
• 401 key_invalid: "The API key is not valid." No usable key: malformed, unknown, revoked, expired or stopped. One refusal covers all five, telling a caller which is which maps the surface for them. A request with no Authorization header at all is refused 400 before any key is looked for.
• 403 scope_missing: "This key cannot read Stock." The key may not reach this operation. scope_missing when the key does not hold Stock; organization_mismatch when the path names an organisation that is not the key's; ip_not_allowed when the caller's address is outside the key's allowlist.
• 404 Data not found
• 429

Try it in the reference

Get forecast accuracy

GET /api/v1/inventory/forecast-accuracy

Scopes: inventory:read

What the weekly forecast-accuracy job measured, read back: a trailing window and a latest week, each carrying wmape, wmase and the population they were scored over, and a weeks series behind them. Nothing is recomputed, so the figures are the ones measured at the time.

Optional	In	What it is
weeks	query	Window and cap, the most recent N measured whole weeks.
start_date	query	Narrow to measured weeks starting on or after this date.
end_date	query	Narrow to measured weeks ending on or before this date.
current_state	query	Opt out of the two read-time inventories, forecast coverage and model provenance, which are computed against the live catalogue on every request and are most of this endpoint's cost.
product_type	query	Restrict every figure to one category from products.product_type, matched exactly against the stored slice.
sales_channel_id	query	Restrict every figure to one sales channel, wholesale and retailer channels included.
Tightly-Version	header	The date train to answer on.

curl "https://api.app.tightly.io/api/v1/inventory/forecast-accuracy" \
  -H "Authorization: Bearer $TIGHTLY_API_KEY"

What it answers

{
  "data": {
    "latest": {
      "total_actual": 18400,
      "total_predicted": 17920,
      "total_variants": 4120,
      "variants_with_sales": 3880,
      "week_end_date": "2026-08-30",
      "week_start_date": "2026-08-24",
      "wmape": 0.261,
      "wmase": 0.78
    },
    "refusal": null,
    "scope": null,
    "trailing": {
      "average_bias": -0.031,
      "computed_at": "2026-09-01T06:31:00+00:00",
      "false_demand_rate": 0.06,
      "measured_days": 364,
      "population": 4120,
      "population_label": "variants with sales in the window",
      "weeks": 52,
      "weeks_missing": 0,
      "window_end_date": "2026-08-31",
      "window_start_date": "2025-09-08",
      "wmape": 0.284,
      "wmase": 0.81,
      "wmase_baseline": "seasonal_naive"
    },
    "weeks": [
      {
        "week_start_date": "2026-08-17",
        "wmape": 0.297,
        "wmase": 0.84
      },
      {
        "week_start_date": "2026-08-24",
        "wmape": 0.261,
        "wmase": 0.78
      }
      …
    ]
  }
}

What it refuses

• 400 Bad Request. An out-of-range weeks, or an unparseable date
• 401 key_invalid: "The API key is not valid." No usable key: malformed, unknown, revoked, expired or stopped. One refusal covers all five, telling a caller which is which maps the surface for them. A request with no Authorization header at all is refused 400 before any key is looked for.
• 403 scope_missing: "This key cannot read Stock." The key may not reach this operation. scope_missing when the key does not hold Stock; organization_mismatch when the path names an organisation that is not the key's; ip_not_allowed when the caller's address is outside the key's allowlist.
• 429

Try it in the reference

One product's position at a warehouse

GET /api/v1/inventory/position

Scopes: inventory:read

What is there, what is held, what is coming and what is left to sell, for one product at one warehouse: on_hand, reserved broken down by why each unit is spoken for and by which order holds it, expected_inbound broken down by the purchase or transfer order it is coming on, and atp.

Required	In	What it is
variant_id	query	The product variant to read the position of.

Optional	In	What it is
location_id	query	The warehouse.
Tightly-Version	header	The date train to answer on.

curl "https://api.app.tightly.io/api/v1/inventory/position?variant_id=<variant_id>" \
  -H "Authorization: Bearer $TIGHTLY_API_KEY"

What it answers

{
  "data": {
    "as_of": "2026-09-05T06:05:12+00:00",
    "atp": 566,
    "expected_inbound": {
      "by_document": [
        {
          "due": "2026-09-19",
          "id": "1042",
          "name": "PO-00001042",
          "quantity": 200,
          "supply_class": "firm",
          "type": "purchase_order"
        }
      ],
      "quantity": 200,
      "returns_expected": 0
    },
    "location_id": "loc-lb",
    "location_name": "Long Beach",
    "locations": [],
    "movements": [
      {
        "actor": null,
        "document": {
          "id": "31",
          "name": "RET-00000031",
          "type": "return"
        },
        "id": 9013,
        "kind": "return",
        "landed_unit_cost": {
          "cents": null,
          "currency": null,
          "reason": "Not measured",
          "usd": null
        },
        "occurred_at": "2026-09-05T02:14:00+00:00",
        "quantity_delta": 2,
        "unit_cost": {
          …
        }
      }
    ]
  }
}

What it refuses

• 400 No variant_id was sent, or a parameter could not be read.
• 401 key_invalid: "The API key is not valid." No usable key: malformed, unknown, revoked, expired or stopped. One refusal covers all five, telling a caller which is which maps the surface for them.
• 403 scope_missing: "This key cannot read Stock." The key may not reach this operation. scope_missing when the key does not hold Stock; organization_mismatch when the path names an organisation that is not the key's; ip_not_allowed when the caller's address is outside the key's allowlist.
• 404 variant_not_on_file: "No product with that id is on file." No product or no warehouse with that id is on file (variant_not_on_file, location_not_on_file).
• 429

Try it in the reference

Stock on hand at each period boundary

GET /api/v1/inventory/stock-on-hand

Scopes: inventory:read

Stock at each period boundary, per category and location: one row per period with its opening and closing level, plus the window, the grain, the calendar it was bucketed on, a coverage block and a basis note.

Required	In	What it is
start_date	query	First day of the window (YYYY-MM-DD).
end_date	query	Last day of the window, inclusive (YYYY-MM-DD). At most 400 days after the start.

Optional	In	What it is
grain	query	The period the ladder is cut into. The same two keys the net sales feed serves.
categories	query	Comma-separated categories to filter to. Filters; never changes the grain.
locations	query	Comma-separated location ids to filter to.
Tightly-Version	header	The date train to answer on.

curl "https://api.app.tightly.io/api/v1/inventory/stock-on-hand?start_date=<start_date>&end_date=<end_date>" \
  -H "Authorization: Bearer $TIGHTLY_API_KEY"

What it answers

{
  "data": {
    "basis_note": "Levels at each period boundary, read from the nightly inventory archive.",
    "calendar": "retail_454",
    "channel_axis": null,
    "cover_note": "Every location in scope reported on the boundary date.",
    "coverage": {
      "archive": "complete",
      "carry_forward_days": 0,
      "categories": 14,
      "locations": 4,
      "max_staleness_days": 1,
      "pairs": 4120,
      "pairs_costed": 3990,
      "pairs_measured_at": "2026-06-30",
      "pairs_priced": 4008,
      "periods": 26,
      "periods_with_closing": 26,
      "periods_with_opening": 26,
      "unattributed_reason": null,
      "unattributed_units": 0,
      "unattributed_value_at_cost": 0
    },
    "grain": "retail_week",
    "rows": [
      {
        "category": "Knitwear",
        "closing": 17120,
        "opening": 18400,
        "period_start": "2026-01-05"
      },
      {
        "category": "Knitwear",
        "closing": 16008,
        "opening": 17120,
        "period_start": "2026-01-12"
      }
    ],
    "window": {
      "end_exclusive": "2026-07-01"
      …
    }
  }
}

What it refuses

• 400 A date could not be read, end_date precedes start_date, the window exceeds 400 days, or the grain is not one the calendar module serves.
• 401 key_invalid: "The API key is not valid." No usable key: malformed, unknown, revoked, expired or stopped. One refusal covers all five, telling a caller which is which maps the surface for them. A request with no Authorization header at all is refused 400 before any key is looked for.
• 403 scope_missing: "This key cannot read Stock." The key may not reach this operation. scope_missing when the key does not hold Stock; organization_mismatch when the path names an organisation that is not the key's; ip_not_allowed when the caller's address is outside the key's allowlist.
• 429

Try it in the reference

Every variant with its stock

GET /api/v1/inventory/table

Scopes: inventory:read

A page of stock: on hand, incoming, committed and available quantities, days of cover and a health word, with filtered_max_size for the filtered set's size.

Optional	In	What it is
include_stock_availability	query	Return stock_availability per row: isp and wisp today; isp_30d and wisp_30d over the last 30 completed days of the organisation's calendar.
offset	query	The number of rows to skip before starting to return items.
limit	query	The maximum number of rows to return.
type	query	View type - 'variants' shows individual variants, 'products' shows grouped by product.
filter_args	query	A JSON array of {key, operation, value}. The allowlist of keys and operations, and what each one means, is on the schema below.
sort_args	query	Comma-separated columns to sort by; prefix a column with - for descending.
search	query	Search term for filtering results.
distinct	query	Comma-separated distinct columns (e.g. variant_id,location_id).
fields	query	Comma-separated list of fields to return in each row.
view	query	When set to 'combined', returns a product-level view without requiring type=products.
bom_id	query	Bill of materials ID to filter by.
export	query	When true, returns an export URL instead of table data.
Tightly-Version	header	The date train to answer on.

curl "https://api.app.tightly.io/api/v1/inventory/table" \
  -H "Authorization: Bearer $TIGHTLY_API_KEY"

What it answers

{
  "data": {
    "filtered_max_size": 4120,
    "filtered_max_unique_size": 1284,
    "offset": 0,
    "rows": [
      {
        "available_qty": 261,
        "committed_qty": 41,
        "days_of_cover": 18,
        "health": "caution",
        "incoming_qty": 800,
        "location_id": "loc_0004",
        "location_name": "London DC",
        "on_hand_qty": 302,
        "product_id": "4410092",
        "product_title": "Terry Crew",
        "sku": "TB-CREW-BLK-M",
        "variant_id": "44100920011",
        "variant_title": "Black / M"
      }
    ],
    "size": 1
  },
  "message": {
    "desc": "",
    "service": "inventory",
    "severity": "INFO"
  }
}

What it refuses

• 401 key_invalid: "The API key is not valid." No usable key: malformed, unknown, revoked, expired or stopped. One refusal covers all five, telling a caller which is which maps the surface for them. A request with no Authorization header at all is refused 400 before any key is looked for.
• 403 scope_missing: "This key cannot read Stock." The key may not reach this operation. scope_missing when the key does not hold Stock; organization_mismatch when the path names an organisation that is not the key's; ip_not_allowed when the caller's address is outside the key's allowlist.
• 429

Try it in the reference