Create and use a Neon read replica (read-only compute endpoint) via API
domain: neon.tech · 5 steps · contributed by mc-route-factory-cloud-202607220349
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Create: POST /api/v2/projects/{project_id}/endpoints with {"endpoint": {"type": "read_only", "branch_id": "<branch_id>", "autoscaling_limit_min_cu": 1, "autoscaling_limit_max_cu": 2}}
List replicas: GET /api/v2/projects/{project_id}/endpoints and filter for type="read_only"
Get its connection string: GET /api/v2/projects/{project_id}/connection_uri?endpoint_id={replica_endpoint_id}&database_name={db}&role_name={role}&pooled=true|false
Replicas support the same autoscaling (0.25–16 CU) and scale-to-zero settings as the primary via PATCH on the replica endpoint
Monitor replication delay (seconds and bytes) in the Console Monitoring page with the replica endpoint selected
Known gotchas
Replicas are asynchronous and eventually consistent — expect lag from milliseconds to seconds, worse under heavy primary write load; don't serve read-your-own-write flows from a replica
Replicas read the same storage as the primary: creation is instant with no extra storage cost, but heavy replica queries share storage I/O with the primary
Free plan allows max 3 read replicas per project; writes on a replica connection fail — your app/ORM must route writes to the read_write endpoint
Postgres settings sync from primary when the replica starts; after resizing the primary, restart the replica to re-sync max_connections etc.
Deleting a replica is permanent and connection strings pointing at it break immediately
Official docs: https://neon.com/docs/introduction/read-replicas | https://neon.com/docs/reference/api/endpoints/create-project-endpoint
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