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Getting started

Fabric is a drop-in base-URL swap. Point a workflow at it, and every request is measured and attributed from then on.

Setup checklist

0/5 complete

Point a workflow at the gateway

Label it with X-Fabric-Workflow

Stage a lever past off

See realized savings

Promote a lever to live

Connect a workflow

Change the base URL to the gateway and add the headers. The provider key can stay in the client — Fabric forwards it — or be set on the gateway.

curl https://15-207-132-204.sslip.io/v1/messages \
  -H 'content-type: application/json' \
  -H 'x-api-key: $PROVIDER_KEY' \
  -H 'x-fabric-tenant: default' \
  -H 'x-fabric-session: my-session' \
  -H 'x-fabric-workflow: deploy-summary' \
  -d '{"model":"claude-sonnet-4-5-20250929","messages":[{"role":"user","content":"hello"}]}'

How the rollout works

offThe lever does not run. Nothing is measured.

stagedThe lever measures what it would have saved without taking it. This is the "turn it on" number.

canaryA share of sessions take the saving; sampling is per session so models never flip mid-conversation.

liveEvery session takes the saving.

Open levers