@zonofthor if I understand your problem correctly you want to do something like this

version: '3'
services:
  api_01:
    image: someyogaimage
    restart: always
    command: "yarn start"
    environment:
      - PRISMA_ENDPOINT=<http://prisma:4466/service1>
      - PRISMA_SECRET="my-secret"
    ports:
      - "4000:4000"
  api_02:
    image: someyogaimage
    restart: always
    command: "yarn start"
    environment:
      - PRISMA_ENDPOINT=<http://prisma:4466/service2>
      - PRISMA_SECRET="my-secret"
    ports:
      - "4000:4000"

  prisma:
    image: prismagraphql/prisma:1.10
    restart: always
    ports:
    - "4466:4466"
    environment:
      PRISMA_CONFIG: |
        port: 4466
        # uncomment the next line and provide the env var PRISMA_MANAGEMENT_API_SECRET=my-secret to activate cluster security
        managementApiSecret: my-secret
        databases:
          default:
            connector: mysql
            active: true
            host: db
            port: 3306
            user: root
            password: prisma
  db:
    image: mysql:5.7
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: prisma

NOTE this doesn't work but it's just for you to get a sense of how it would be working