---
title: "Blocks that can reach a POI"
method: GET
path: "/v1/pois/{dest_id}/catchment"
tags: ["destination POI"]
---

# Blocks that can reach a POI

`GET /v1/pois/{dest_id}/catchment`

## Request

- Base URL: `https://api.close.city`
- URL: `https://api.close.city/v1/pois/{dest_id}/catchment`
- Auth: HTTP bearer

Every census block within reach of this POI and its travel time, one row
per (block, mode). Keyset-paginated by (mode, block).

## Path parameters

- `dest_id` integer, required: Stable destination id

## Query parameters

- `mode` string[], nullable
- `block` integer[], nullable
- `max_minutes` number, nullable
- `limit` integer, nullable
- `cursor` string, nullable

## Response `200`

Successful Response

- CatchmentResponse
  - `dest_id` integer, required
  - `next_cursor` string, nullable
  - `results` CatchmentResult[], required
    - `geoid` string, required
    - `mode` string, required
    - `travel_time` number, required: Minutes, 1 decimal

## Other responses

- `304`: Not modified (If-None-Match matched the ETag); no body, no tokens charged
- `400`: Invalid request (e.g. invalid-parameters, invalid-cursor, invalid-bbox, missing-location, missing-area, invalid-geometry, polygon-too-complex, missing-origins, too-many-origins)
- `401`: Missing or invalid API key (missing-key, invalid-key)
- `403`: Key disabled (account-disabled)
- `404`: Resource not found (block-not-found, poi-not-found, place-not-found, point-not-covered, no-isochrone-data, direction-not-available)
- `429`: Rate limited or token balance exhausted (rate-limited, tokens-exhausted); sets Retry-After
- `503`: Backend temporarily unavailable (debit-unavailable, store-unavailable); may set Retry-After

---

[API](https://skmtc.dev/close-city/apis/close-api.md) · [All operations](https://skmtc.dev/close-city/apis/close-api/llms.txt) · [OpenAPI document](https://skmtc.dev/close-city/apis/close-api/revisions/a70e7c778d65?raw)