Open Sea

All our NFT Smart Contracts are fully ERC721 compatible, therefore can be viewed or traded on Opensea or any other marketplace compatible with ERC-721.

Test your items on testnet

Validation

Validate your contract/item on Open Sea using the following url:

https://testnets-api.opensea.io/api/v1/asset/<your contract address>/<your token id>/validate

If you see a 406 error, do the following

Verify that the endpoint on your website is working

If your endpoint is working, ask your server provider to whitelist opensea API

When validated, do a force_update and try again

https://testnets-api.opensea.io/api/v1/asset/<your contract address>/<your token id>/?force_update=true

View your items on Open Sea

Now that your items is validated, you can see it in the Open Sea store, go to:

https://testnets.opensea.io/assets/<your contract address>/<your token id>/

Test your items on mainnet

Same steps as before, but use the following API url

https://api.opensea.io/api/v1/asset/<your contract address>/<your token id>/validate

https://api.opensea.io/api/v1/asset/<your contract address>/<your token id>/?force_update=true

https://opensea.io/assets//<your contract address>/<your token id>/

Reference

Viewing your items on Opensea

Opensea testnets

Opensea thread on WPSmartContracts WordPress plugin forum