Lineaxer: Linea NFT-indexer 👾👽🤖 ETHGlobal Paris 🇫🇷

Linea x The Graph x Metamask

Artur Khaialiev a.k.a zytfo

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Applied bounties:

• Metamask x Linea: Build an NFT indexer on Linea
• The Graph: Best New Subgraph or Substream; Best use of Existing Subgraph or Substream

Submission Content 🤞

1. Lineaxer-Subgraph - self-hosted Linea Goerli Subgraph with a ERC721 indexer. Deployed at: http://65.21.255.216:8000/subgraphs/name/generated/lineaxer/graphql

2. Lineaxer-Frontend - self-hosted Next JS application to gather data from the deployed Linea Goerli subgraph. Deployed at: http://135.181.109.7:3000

Main Challenges 💀

1. The Graph

• No listed Linea Goerli network in the dashboard at https://thegraph.com/hosted-service

• Since I have an M1 Pro docker-compose in the graph-node repository has always failed because of an out-of-memory problem and was solved by deploying a node on a remote host. Also, I was talking to a mentor and we discovered docker-compose.yml maps are not the latest image of the graphprotocol/graph-node so it caused the described problem. It may be solved with the latest tag of the image, the latest one is graphprotocol/graph-node:97e0adc

• I thought there was a CORS problem asking the subgraph with queries, but it was an incorrect subgraph URL

• Rate limit on Infura. Syncing the Linea Goerli chain caused a rate limit of queries to a chain, thanks to Emily for providing me with an API-key for Infura

• ERC721 indexer stuff generation. Refer here. Thanks to @openzeppelin/subgraphs

2. Linea x Metamask

• I'M NOT A FRONTEND DEV BUT I MADE IT (thanks to Patrick Collins from ChainLink with his tutorials)

How To 🥷

1. The Graph

• Use the GraphQL interface to query data at http://65.21.255.216:8000/subgraphs/name/generated/lineaxer/graphql
• or send GraphQL queries to http://65.21.255.216:8000/subgraphs/name/generated/lineaxer

2. Linea x Metamask

• Go at http://135.181.109.7:3000/ (it will redirect to an existing wallet on Linea Goerli)

• Search for an adress in the URL after a slash (e.g. http://135.181.109.7:3000/0xb904c30e0f8f45f2face933523e33072a4e6781e)

• Note: all addresses are clickable (may not show because of the long syncing)

• You may also connect a wallet (just to look at how many funds do you have :))

Thanks To ❤️

• Metamask x Linea team, especially Emily
• The whole Graph team, I love you guys
• My mom and a Talent Protocol Team

A Few Pics

• Lineaxer

• The Subgraph GraphQL

• Syncing Linea Goerli Subgraph