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PolymarketDocumentation/docs/api-reference/misc/get-open-interest.md
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> ## Documentation Index
> Fetch the complete documentation index at: https://docs.polymarket.com/llms.txt
> Use this file to discover all available pages before exploring further.
# Get open interest
## OpenAPI
````yaml api-spec/data-openapi.yaml get /oi
openapi: 3.0.3
info:
title: Polymarket Data API
version: 1.0.0
description: >
HTTP API for Polymarket data. This specification documents all public
routes.
servers:
- url: https://data-api.polymarket.com
description: Relative server (same host)
security: []
tags:
- name: Data API Status
description: Data API health check
- name: Core
- name: Builders
- name: Misc
paths:
/oi:
get:
tags:
- Misc
summary: Get open interest
parameters:
- in: query
name: market
style: form
explode: false
schema:
type: array
items:
$ref: '#/components/schemas/Hash64'
responses:
'200':
description: Success
content:
application/json:
schema:
type: array
items:
$ref: '#/components/schemas/OpenInterest'
'400':
description: Bad Request
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
'500':
description: Server Error
content:
application/json:
schema:
$ref: '#/components/schemas/ErrorResponse'
components:
schemas:
Hash64:
type: string
description: 0x-prefixed 64-hex string
pattern: ^0x[a-fA-F0-9]{64}$
example: '0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917'
OpenInterest:
type: object
properties:
market:
$ref: '#/components/schemas/Hash64'
value:
type: number
ErrorResponse:
type: object
properties:
error:
type: string
required:
- error
````