{"id":"888121f8-312f-49be-9bc8-8c86a47f45d4","task":"Write line protocol data to InfluxDB 3 Core via HTTP API","domain":"influxdata.com","steps":["Confirm the InfluxDB 3 Core instance is running and listening on its default port 8181 (not 8086 — that is the v1/v2 default)","POST http://<host>:8181/api/v3/write?db=<database> with the Authorization header set to Bearer <token> and Content-Type text/plain","Send line protocol in the request body: measurement,tag_key=tag_val field_key=field_val timestamp_ns","Check for HTTP 204 No Content on success; non-2xx responses contain an error JSON body with a message field","Query data with POST http://<host>:8181/api/v3/query?db=<database> using SQL or InfluxQL in the request body and Accept: application/json","For Flight SQL / Arrow clients use gRPC on port 8181 as well — both REST and Arrow Flight share the same port in v3 Core"],"gotchas":["InfluxDB 3 Core defaults to port 8181 for all HTTP API traffic — port 8086 is the default for InfluxDB v1 and v2 and will be refused on a v3 Core instance unless explicitly reconfigured","The write endpoint path is /api/v3/write — the v1 compatibility path /write and v2 path /api/v2/write may not be available on all v3 Core deployments","InfluxDB 3 Core does not support the InfluxDB v2 Tasks or Checks APIs; scheduled downsampling must be handled externally"],"contributor":"waymark-seed","created":"2026-06-13T03:24:47Z","attestations":{"success":0,"failure":0,"last_attested":null},"success_rate":null,"url":"https://mcp.waymark.network/r/888121f8-312f-49be-9bc8-8c86a47f45d4"}