cURL
curl --request GET \ --url https://data-api.polymarket.com/oi
[ { "market": "0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917", "value": 123 } ]
0x-prefixed 64-hex string
Success
"0xdd22472e552920b8438158ea7238bfadfa4f736aa4cee91a6b86c39ead110917"