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Spendline

Claimed

Track AI costs by customer, protect margins, and block over-budget calls

Free, no paid tier
Free AI Observability
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Tracked since 2026

The Bottom Line

Best for
SaaS companies that sell AI features and need to see cost and margin per customer, and cap spend per customer or agent.
Price
Free, no paid tier. Compare plans

Key facts

  • Calls that would go over budget are refused with HTTP 402 before they reach the model provider, so a blocked call costs
  • Budgets nest from company to team, agent and customer, and one budget spans OpenAI, Anthropic and eight other providers
  • Every call is written to an append-only ledger by customer, agent and workflow, and a month can be closed and reconciled

What is Spendline?

Spendline is an AI gateway for SaaS companies that sell AI features. It records the cost of every model call against the customer and agent it served, across ten providers, and shows margin per customer. Budgets nest from company to team, agent and customer, and calls that would go over budget are blocked before they run. It also supports approvals to exceed a budget, budget alerts to Slack or Discord, and month-end invoice checks.

Available on: Web

Data compiled by Toolradar How we evaluate
Source spendline.ai

Preview

Key Features

  • Cost per call attributed to customer, agent, workflow and team across ten providers
  • Margin per customer: revenue entered or imported by CSV against AI cost, with customers below 40% flagged
  • Nested budgets (company, team, agent, customer) that block calls with HTTP 402 before they run
  • Approval to exceed a budget: a different owner must approve, and every override is audited
  • Budget alerts at 50, 80, 90 and 100 percent to Slack or Discord
  • Model policies: block lists, allow-lists, per-model token caps, plus rules that reroute calls to cheaper models
  • Month close and invoice reconciliation: a closed month's total never changes, corrections are new ledger rows
  • Drop-in setup: change the provider base URL, keep your own provider API keys, attribute with HTTP headers

Pricing

Free Free Trial

Spendline is completely free to use with no hidden costs.

View pricing

Is Spendline worth the price?

Fair value

Without a pricing structure, the product is best suited for early adopters who want to test AI spend management before committing.

The lack of published pricing is unusual and may signal an upcoming launch or custom enterprise model.

Full Spendline pricing: every plan, hidden costs and alternatives

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Still deciding?

Most buyers shortlist 2 or 3 tools before committing. Pull a side-by-side comparison or browse the full alternatives shortlist below.

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Spendline FAQ

How does Spendline track AI costs per customer?

Spendline records the cost of every model call against the customer and agent it served, across ten providers, and shows margin per customer. This allows SaaS companies to see exactly which customers drive profit or loss on AI features.

How does Spendline's budget enforcement compare to that of Helicone?

Spendline is an AI gateway that enforces nested budgets from company to team, agent, and customer, and blocks calls that would go over budget before they run. Helicone is a direct competitor in AI observability, but Spendline's customer-level budget enforcement is a distinct approach to protecting margins.

Which AI providers does Spendline cover, and what does that mean for teams using other providers?

Spendline tracks costs across ten AI providers. Teams using providers outside that set will not have those calls recorded by Spendline, so they would need alternative cost tracking for those providers.

What kind of user or team should choose Spendline for AI cost management?

SaaS companies that sell AI features and need to understand profitability per customer will benefit most from Spendline. Its customer-centric cost tracking and margin display are designed for teams that need to protect margins on AI offerings.

How is Spendline priced?

Spendline is free to use with no paid plan required. This makes it accessible for any SaaS company that sells AI features.

Can Spendline prevent over-budget calls from running?

Yes, Spendline blocks calls that would exceed a budget before they are executed. It also supports approvals to exceed a budget when needed.

How does Spendline support budget overage approvals and alerts?

Spendline sends budget alerts to Slack or Discord, and supports approvals to exceed a budget. Additionally, it performs month-end invoice checks to reconcile usage.

Source: spendline.ai

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