SaaS/PaaS Cost Optimization Skill

SaaS/PaaS Cost Optimization

Use this skill to audit, reduce, and monitor infrastructure and SaaS spending. Keep the output operational: cost breakdown, waste identification, optimization actions, and monitoring setup.

Quick Reference

| Need | Starting Reference | Notes | |------|--------------------|-------| | audit Vercel bill | references/vercel-cost-guide.md | ISR, Functions, Fast Origin Transfer, Image Optimization | | audit Supabase bill | references/supabase-cost-guide.md | compute, storage, bandwidth, Auth MAUs, Edge Functions | | audit email costs | references/resend-cost-guide.md | volume tiers, batch efficiency, domain warm-up | | audit domain costs | references/domain-registrar-cost-guide.md | GoDaddy vs Cloudflare vs Namecheap, transfer savings | | audit payment processing | references/stripe-cost-guide.md | transaction fees, Radar, Billing, volume negotiation | | audit AI API spend | references/ai-api-cost-guide.md | Claude, GPT, prompt caching, batch API, model routing | | audit CI/CD costs | references/github-cicd-cost-guide.md | Actions minutes, Copilot, Codespaces, hosting alternatives | | audit monitoring costs | references/monitoring-analytics-cost-guide.md | PostHog, Sentry, Datadog, free tier maximization | | audit CDN/edge costs | references/cloudflare-cost-guide.md | Workers, R2, Pages, DNS, free tier scope | | decide on AWS/GCP/Azure commitments or K8s cost allocation | references/cloud-commitment-and-k8s-cost-guide.md | Savings Plans vs RIs vs Spot, CUDs, Azure Reservations, when NOT to commit, OpenCost/Kubecost, GPU capacity | | set up cost monitoring | references/cost-monitoring-setup.md | budget alerts, review cadence, annual cost calendar, FOCUS normalization | | track unit economics | references/unit-economics-guide.md | cost per customer/feature/request, ARPC tracking, FOCUS standard | | IaC cost guardrails in CI | references/github-cicd-cost-guide.md | Infracost PR diffs, budget-threshold merge gates | | monthly cost review | assets/monthly-cost-review-checklist.md | reusable review template | | automated cost audit from billing data | agents/cost-auditor.md | parses screenshots/API data, ranks top 5 cost drivers, outputs prioritized actions |

Workflow

inventory — list all paid services, current plans, billing cycles, and monthly spend
audit — for each service: pull usage data, compare to plan limits, identify top cost drivers by dollar amount
diagnose — classify each cost line:
- necessary: directly supports revenue or product function
- reducible: supports function but can be lowered via architecture or configuration
- wasteful: unused, over-provisioned, or cheaper alternative exists
optimize — load the platform-specific reference file and apply the highest-impact tactics first
monitor — set up budget alerts, usage dashboards, and a monthly review cadence using references/cost-monitoring-setup.md

ASCII Flow

Cost concern or bill review
  -> Inventory paid services, owners, plans, cycles, and spend
  -> Rank cost lines by monthly dollar impact
  -> Classify each line
     +-- necessary -> protect and monitor
     +-- reducible -> tune architecture, usage, seats, or plan tier
     +-- wasteful -> cancel, consolidate, or downgrade
  -> Load platform guide for top drivers
  -> Apply highest-impact optimizations first
  -> Add budget alerts, dashboards, and monthly review cadence

Decision Rules

start with the highest-cost service and work down
distinguish usage-based charges (optimizable) from flat subscriptions (right-size or cancel)
check if the free tier covers actual usage before paying for a plan
prefer architecture changes (caching, CDN, SSG, on-demand ISR) over plan upgrades
compare annual vs monthly pricing — annual often saves 15-20%
consolidate services when one platform covers multiple needs (e.g., Cloudflare for DNS + CDN + storage)
never optimize a $2/month line before a $20/month line
when in doubt, measure for one billing cycle before cutting
never buy a commitment (Savings Plan, RI, CUD, Reservation) against usage that hasn't been stable for 4-6+ weeks, or during an active migration/re-platform — see references/cloud-commitment-and-k8s-cost-guide.md
separate zero-risk waste elimination from margin/durability trade-offs before cutting — a cut that reduces headroom or DR posture needs an explicit risk owner, not just a plan-tier downgrade
weigh implementation and ongoing operational cost (engineer-time, new on-call burden) against savings before recommending a migration — a cheaper service that costs six weeks to adopt often doesn't pay back for a year

Cost Categories

| Category | Examples | Optimization Lever | |----------|----------|--------------------| | compute | Vercel Functions, Supabase database, edge workers | reduce invocations, optimize cold starts, right-size memory | | bandwidth | Fast Origin Transfer, database egress, CDN transfer | caching, compression, image optimization, SSG | | storage | Supabase storage, R2, S3, blob stores | lifecycle policies, compression, deduplication | | per-request | ISR writes/reads, API calls, email sends | batching, caching, debouncing, on-demand invalidation | | subscriptions | Pro plans, seats, add-ons | right-size plan tier, remove unused seats/add-ons | | transaction fees | Stripe processing, dispute fees | volume negotiation, reduce disputes, batch payouts | | AI tokens | Claude API, OpenAI API, fine-tuning, self-hosted GPU inference | prompt caching, model routing, batch API, shorter prompts, spot/reserved GPU capacity | | cloud commitments | AWS Savings Plans/RIs, GCP CUDs, Azure Reservations | commit only against a verified stable usage floor, layer flexible + rigid instruments, never commit mid-migration | | K8s cluster cost | shared node pools, control plane, storage, load balancers | namespace/label cost allocation (OpenCost/Kubecost), request-vs-usage rightsizing |

When to Use This Skill

monthly bill is higher than expected and you want to find what's driving it
launching new projects and want to forecast infrastructure costs
comparing free tier vs paid tier for a service
setting up cost alerts and budget monitoring
annual cost review and plan right-sizing
evaluating whether to switch or consolidate services
deciding whether to buy a Savings Plan, Reserved Instance, or Committed Use Discount, and how much
allocating shared Kubernetes cluster cost back to teams or features
governing AI/LLM spend before a new model-backed feature ships

Route Elsewhere

company-level burn rate, runway, and financial operations -> startup-operating-system
infrastructure architecture and platform design -> ops-devops-platform
choosing between managed backend platforms -> software-baas-platforms
AI API integration patterns (not cost) -> software-ai-integration
payment system design (not cost) -> software-payments

Optimization Playbook

Quick wins (do first)

remove unused projects, environments, and preview deployments
switch time-based ISR revalidation to on-demand revalidation
enable image optimization and compression
check for services still on paid plans but no longer used
consolidate DNS to a provider that includes it free (Cloudflare)

Architecture changes (do next)

move static content to CDN or SSG to reduce function invocations
add response caching at edge to reduce origin transfer
batch API calls and email sends instead of per-request
use prompt caching for repeated AI API calls
implement connection pooling to reduce database compute

Plan optimization (do quarterly)

compare current usage against plan tier limits
evaluate annual vs monthly billing
check if usage has dropped below the free tier threshold
negotiate volume pricing when crossing tier boundaries
remove unused seats and add-ons

Anti-Patterns

optimizing $1 costs while ignoring $50 costs
switching to a cheaper service without accounting for migration effort
cutting costs that directly support revenue-generating features
skipping monitoring setup — costs drift back up within months
over-provisioning "just in case" without measuring actual usage
paying for annual plans on services you might stop using

Navigation

Platform references

Cross-platform

Agents

agents/cost-auditor.md

Related Skills

Fact-Checking

Verify current pricing, tier limits, and free-tier inclusions before final recommendations.
Pricing changes frequently — prefer official pricing pages over cached knowledge.
If web access is unavailable, mark pricing-sensitive guidance as unverified and include the official pricing URL from data/sources.json.

Learnings Loop

Before applying this skill on a non-trivial task, read learnings.consolidated.md in this directory (and learnings.md if present).

After applying it, if you encountered a pattern worth remembering, a mistake worth preventing, or a domain fact that surprised you, append one dated bullet to learnings.md via agents-skills-feedback-loop/scripts/append_learning.py. Do not modify SKILL.md itself.

Agent Skills: SaaS/PaaS Cost Optimization

Install this agent skill to your local

Skill Files