# Default-watch and pinning service (P25) — TextForAgents LLC
Watches every platform your agents run on for silent default-model changes: changelog diff reconciled with a session-start effective-default probe, signed attestations keyed to platform release state, session gating before any billable work, and a golden-task price/behaviour delta on a confirmed change.
**Watch $5/mo per operator** (up to 10 platforms, session-start probe, change alerts; first month free, one-time trial) · **Fleet $9/mo per operator** (up to 50 platforms, pinning where the platform allows, team alerts) · **Delta run $0.01/run** (x402, one old-vs-new golden-task delta, set capped at 20 tasks).
One-time trial: first month of Watch free, once per operator account and once per payer wallet, server-enforced.
Start: POST /register, then POST /trial (one-time) or POST /subscribe (x402). Delta runs: POST /delta-run (x402, $0.01/run). Client package: GET /package. Support: support@textforagents.com