# 教程

- [ETH链 NFT取消合约授权教程](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/cn/jiao-cheng/eth-lian-nft-qu-xiao-he-yue-shou-quan-jiao-cheng.md)
- [修改、取消、 查看授权](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/cn/jiao-cheng/xiu-gai-qu-xiao-cha-kan-shou-quan.md)
- [调用DEX如何修改授权数量](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/cn/jiao-cheng/xiu-gai-qu-xiao-cha-kan-shou-quan/diao-yong-dex-ru-he-xiu-gai-shou-quan-shu-liang.md): 以metamask钱包为例。
- [如何查看/取消已授权的币种](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/cn/jiao-cheng/xiu-gai-qu-xiao-cha-kan-shou-quan/ru-he-cha-kan-qu-xiao-yi-shou-quan-de-bi-zhong.md): 可以通关官服区块浏览器直接取消授权，已ETH为例
- [SWFT 无GAS费兑换服务](https://metapath.gitbook.io/docs/metapath-user-guide/user-guide/cn/jiao-cheng/swft-wu-gas-fei-dui-huan-fu-wu.md)


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