Retrieve collection offers

This endpoint is used to get collection offers for a specified collection.

What are collection offers?
If you'd like to purchase into a collection but don't have a particular NFT in mind, collection offers allow you to make an offer that applies to all NFTs in a collection.

Below is a response when querying collection offers for Cool Cats.

Sample URL
https://api.opensea.io/v2/offers/collection/cool-cats-nft

Sample Response

{
  "offers": [
    {
      "order_hash": "0x551d03983a0d3bda03adea180418e5cb5bd821e667297c96d1c118c4c9954184",
      "chain": "ethereum",
      "criteria": {
        "collection": {
          "slug": "cool-cats-nft"
        },
        "contract": {
          "address": "0x1a92f7381b9f03921564a437210bb9396471050c"
        },
        "trait": null,
        "encoded_token_ids": "*"
      },
      "protocol_data": {
        "parameters": {
          "offerer": "0x2e1c64af8f2637a9e60bbc8a8676862160e31554",
          "offer": [
            {
              "itemType": 1,
              "token": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
              "identifierOrCriteria": 0,
              "startAmount": 4000000000000000,
              "endAmount": 4000000000000000
            }
          ],
          "consideration": [
            {
              "itemType": 4,
              "token": "0x1A92f7381B9F03921564a437210bB9396471050C",
              "identifierOrCriteria": 84153106084029437087430973750044509847343042902447319674261334744927458674953,
              "startAmount": 1,
              "endAmount": 1,
              "recipient": "0x2e1C64AF8f2637A9e60bbC8A8676862160E31554"
            },
            {
              "itemType": 1,
              "token": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
              "identifierOrCriteria": 0,
              "startAmount": 100000000000000,
              "endAmount": 100000000000000,
              "recipient": "0x0000a26b00c1F0DF003000390027140000fAa719"
            },
            {
              "itemType": 1,
              "token": "0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2",
              "identifierOrCriteria": 0,
              "startAmount": 200000000000000,
              "endAmount": 200000000000000,
              "recipient": "0xD98D29Beb788fF04e7a648775FcB083282aE9C4B"
            }
          ],
          "startTime": 1665757986,
          "endTime": 1666278120,
          "orderType": 2,
          "zone": "0x004C00500000aD104D7DBd00e3ae0A5C00560C00",
          "zoneHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
          "salt": 24446860302761739304752683030156737591518664810215442929807550314380290621504,
          "conduitKey": "0x0000007b02230091a7ed01230072f7006a004d60a8d4e71d599b8104250f0000",
          "totalOriginalConsiderationItems": 3,
          "counter": 0
        },
        "signature": "0x2ef3d3db3ce141f639886fd4f3f4d19d799a03a448ba6b37edc2950d7166f7921f4904172ee7bb80981dda1028ed59ebfdac3234a1e4f69a579d704e0f2fdc671c"
      }
    },
  ]
}