ARC-72 NFT Indexer Prototype for the AVM (Algorand Virtual Machine)

NOTICE

This application is provided without guarantee or warranty. This is an ALPHA prototype of an ARC-72 NFT Indexer for AVM based networks based on the ARC-74 specification found here:

https://arc.algorand.foundation/ARCs/arc-0074

Includes:

• Block follower to extract token information and transfers from the blockchain and write the applicable data to a SQLite3 database
• API front end to accept and respond to requests
• API Documentation using SwaggerUI

Production Links

Production services below are deployed for the VoiNet network. This includes a block follower and indexer API.

API Endpoints:

• Token Endpoint: https://arc72-idx.nftnavigator.xyz/nft-indexer/v1/tokens
• Transfers Endpoint: https://arc72-idx.nftnavigator.xyz/nft-indexer/v1/transfers

Additional Links:

• API Documentation (Swagger) - https://arc72-idx.nftnavigator.xyz/api-docs
• ARC72 NFT Stats (for testing) - https://arc72-idx.nftnavigator.xyz/stats

Initialize Database

NOTE: SQLite3 is required to initialize the database. To install SQLite3 with APT package manager:

sudo apt-get install sqlite3

To initialize the database in the db folder:

npm run init-db

Self Deployment Instructions

To operate the block-follower and populate the SQLite database:

npm i
npm run backend

To launch the API web service:

npm i
npm run api

The API server will launch by default on port 3000, i.e. http://localhost:3000. To use an alternate port for the API server, pass the -p argument, such as:

npm run api -- -p 5101

or use the environment variable API_SERVER_PORT, i.e.

API_SERVER_PORT=5101 npm run api

Docker Deployment

docker-compose -f docker-compose-backend.yml up -d
docker-compose -f docker-compose-api.yml up -d

Utilizing alternate Indexer and Node

By default the indexer utilizes the public Voi Indexer and Algod endpoints. This can be modified using the following environment variables:

• ALGOD_HOST - AVM Node URL
• ALGOD_TOKEN - AVM Node access Token
• INDEXER_HOST - AVM Indexer URL
• INDEXER_TOKEN - AVM Indexer Token

These environment variables may be added to the Backend container compose file (docker-compose-backend.yml) to scrape data from an alternative indexer and node, or can be pointed to a different chain altogether.

NOTE: If changing the chain, make sure to delete or rename /db/db.sqlite and re-initialize the database!

Things To Do

• Replace database backend (PostreSQL?)
• Improve API server logging
• Use a follower node instead of the public node

Resources

• ARC-72 Specification - https://arc.algorand.foundation/ARCs/arc-0072
• ARC-74 Indexer Specification - https://arc.algorand.foundation/ARCs/arc-0074