A Chainlink External Adapter to retrieve the Opensea floor price of an NFT collection.

• collection_slug: the Opensea NFT collection to query (https://docs.opensea.io/reference/collection-model)

{
  "jobRunID": 0, 
  "data": {
    "stats": {
      "one_day_volume": 2059.34782734916,
      "one_day_change": 0.35853963254478943,
      "one_day_sales": 502,
      "one_day_average_price": 4.102286508663665,
      "seven_day_volume": 5352.95893016035, 
      "seven_day_change": 4.096843834444037,
      "seven_day_sales": 1929, 
      "seven_day_average_price": 2.774991669341809,
      "thirty_day_volume": 13467.0743491787,
      "thirty_day_change": 0.7387267158496497,
      "thirty_day_sales": 6998,
      "thirty_day_average_price": 1.9244175977677478,
      "total_volume": 21212.4400966635, 
      "total_sales": 12390,
      "total_supply": 9999,
      "count": 9999,
      "num_owners": 5197,
      "average_price": 1.7120613475918887,
      "num_reports": 2,
      "market_cap": 27747.14170174875,
      "floor_price": 3.63
    },
    "result": 3.63
  },
  "result": 3.63,
  "statusCode": 200
}

Install dependencies:

yarn

Run the local tests:

yarn test

Natively run the application (defaults to port 8080):

yarn start

curl -X POST -H "content-type:application/json" "http://localhost:8080/" --data '{ "id": 0, "data": {"collection_slug":"doodles-official"} }'

If you wish to use Docker to run the adapter, you can build the image by running the following command:

docker build . -t external-adapter

Then run it with:

docker run -p 8080:8080 -it external-adapter:latest

After installing locally:

zip -r external-adapter.zip .

• In Lambda Functions, create function
• On the Create function page:
  • Give the function a name
  • Use Node.js 12.x for the runtime
  • Choose an existing role or create a new one
  • Click Create Function
• Under Function code, select "Upload a .zip file" from the Code entry type drop-down
• Click Upload and select the external-adapter.zip file
• Handler:
  • index.handler for REST API Gateways
  • index.handlerv2 for HTTP API Gateways
• Add the environment variable (repeat for all environment variables):
  • Key: API_KEY
  • Value: Your_API_key
• Save

If using a HTTP API Gateway, Lambda's built-in Test will fail, but you will be able to externally call the function successfully.

• Click Add Trigger
• Select API Gateway in Trigger configuration
• Under API, click Create an API
• Choose HTTP API
• Select the security for the API
• Click Add

If using a REST API Gateway, you will need to disable the Lambda proxy integration for Lambda-based adapter to function.

• Click Add Trigger
• Select API Gateway in Trigger configuration
• Under API, click Create an API
• Choose REST API
• Select the security for the API
• Click Add
• Click the API Gateway trigger
• Click the name of the trigger (this is a link, a new window opens)
• Click Integration Request
• Uncheck Use Lamba Proxy integration
• Click OK on the two dialogs
• Return to your function
• Remove the API Gateway and Save
• Click Add Trigger and use the same API Gateway
• Select the deployment stage and security
• Click Add

• In Functions, create a new function, choose to ZIP upload
• Click Browse and select the external-adapter.zip file
• Select a Storage Bucket to keep the zip in
• Function to execute: gcpservice
• Click More, Add variable (repeat for all environment variables)
  • NAME: API_KEY
  • VALUE: Your_API_key