agentmoney

agentmoney

Stop guessing what AI costs you. Real-time cost monitoring for Claude, OpenAI, and Gemini APIs.

You run Claude Code overnight. You wake up. Your API bill is $247. You have no idea which session burned it, which model was used, or whether prompt caching saved you anything.

agentmoney shows you exactly where every dollar goes.

Install

npm install -g agentmoney

Or run directly:

npx agentmoney demo

Quick Start

Calculate a single API call cost

# How much does a Sonnet call with 5K input / 1K output cost?
agentmoney calc -m claude-sonnet-4-6 -i 5000 -o 1000

# With prompt caching
agentmoney calc -m claude-sonnet-4-6 -i 5000 -o 1000 --cache-read 3000

Estimate a session cost

# 50 API calls, ~3K input / ~800 output each
agentmoney estimate -m claude-sonnet-4-6 -c 50 --avg-input 3000 --avg-output 800

See all model pricing

agentmoney models

Run the proxy (intercept real API calls)

# Start the proxy on port 8999
agentmoney proxy --port 8999 --alert 5.00

# Then point your API client at the proxy:
ANTHROPIC_BASE_URL=http://localhost:8999 your-app

# View live dashboard at http://localhost:8999/dashboard
# View cost JSON at http://localhost:8999/costs

Fetch real Anthropic usage

# Last 7 days
agentmoney usage

# Last 30 days, JSON output
agentmoney usage --days 30 --json

Run a demo simulation

agentmoney demo

Example Output

  agentmoney demo

  Simulating 8 API calls...

  ........

  agentmoney summary
  ──────────────────────────────────────────────────

    Total cost:      $0.1842
    Total calls:     8
    Sessions:        1

    By provider:
      anthropic       $0.1732  (7 calls)
      openai          $0.0110  (1 calls)

    By model:
      claude-sonnet-4-6              $0.1041  (4 calls, 37.8K tokens)
      claude-opus-4-6                $0.0750  (1 calls, 5.8K tokens)
      claude-haiku-4-5               $0.0027  (2 calls, 3.0K tokens)
      gpt-4o                         $0.0110  (1 calls, 2.6K tokens)

Commands

Command	Description
agentmoney	Show quick start guide and available commands
agentmoney demo	Simulate 8 API calls and see the cost breakdown
agentmoney calc	Calculate cost for a single API call
agentmoney estimate	Estimate cost for a multi-call session
agentmoney models	List all supported models and pricing
agentmoney proxy	Start a local proxy with web dashboard + cost tracking
agentmoney usage	Fetch real usage data from the Anthropic API

Proxy Mode

The proxy sits between your application and the AI API, intercepting responses to extract token usage and calculate costs in real-time.

Your App → agentmoney proxy (localhost:8999) → api.anthropic.com
                ↓
          Cost tracking
          Web dashboard (Chart.js)
          JSONL call log
          Session reports

Proxy Endpoints

Path	Description
GET /dashboard	Web dashboard with Chart.js charts (cost per agent/day, model breakdown, hourly trends)
GET /health	Proxy status + total cost (JSON)
GET /costs	Full cost breakdown (JSON API)
* /*	All other requests proxied to the target

Alert Thresholds

# Warn when session cost exceeds $5
agentmoney proxy --alert 5.00

Supported Models & Pricing

Pricing is current as of March 2026. Fuzzy model name matching handles date suffixes (claude-sonnet-4-6-20260301) and provider prefixes (anthropic/claude-sonnet-4-6). Unknown models default to Sonnet-tier pricing ($3/$15).

Anthropic

Model	Input/MTok	Output/MTok	Cache Read/MTok	Cache Write/MTok
claude-opus-4-6	$5.00	$25.00	$0.50	$6.25
claude-opus-4-5	$5.00	$25.00	$0.50	$6.25
claude-sonnet-4-6	$3.00	$15.00	$0.30	$3.75
claude-sonnet-4-5	$3.00	$15.00	$0.30	$3.75
claude-haiku-4-5	$1.00	$5.00	$0.10	$1.25
claude-opus-4-1	$15.00	$75.00	$1.50	$18.75
claude-3-5-haiku	$0.80	$4.00	$0.08	$1.00
claude-3-haiku	$0.25	$1.25	$0.03	$0.30

OpenAI

Model	Input/MTok	Output/MTok	Cache Read/MTok
gpt-4.1	$2.00	$8.00	$0.50
gpt-4.1-mini	$0.40	$1.60	$0.10
gpt-4.1-nano	$0.10	$0.40	$0.025
gpt-4o	$2.50	$10.00	$1.25
gpt-4o-mini	$0.15	$0.60	$0.075
o3	$2.00	$8.00	$0.50
o4-mini	$1.10	$4.40	$0.275
o1	$15.00	$60.00	—

Google

Model	Input/MTok	Output/MTok
gemini-2.0-flash	$0.10	$0.40
gemini-2.0-pro	$1.25	$5.00
gemini-1.5-flash	$0.075	$0.30

Reports

agentmoney saves reports to .agentmoney/:

• calls.jsonl — Every API call as a JSON line (append-only log)
• report-YYYY-MM-DD.json — Daily cost report (structured data)
• report-YYYY-MM-DD.md — Daily cost report (markdown, shareable)

Configuration

Flag	Default	Description
--port <n>	8999	Proxy port
--target <url>	https://api.anthropic.com	Target API URL
--alert <amount>	none	Warn when session cost exceeds this (USD)
--json	false	Output as JSON (calc, models, usage)
--model <id>	required	Model name for calc/estimate
--days <n>	7	Days to fetch for usage command

Anthropic Usage API

Fetch your real API spending directly from Anthropic (no proxy needed):

agentmoney usage --days 30

Calls the Anthropic /v1/usage endpoint and calculates costs using the same pricing engine. Requires ANTHROPIC_API_KEY with admin-level permissions.

How It Works

• Proxy mode: Express server intercepts API responses, extracts the usage block (input_tokens, output_tokens, cache tokens), calculates cost using built-in pricing tables, logs to JSONL, serves web dashboard
• Calc mode: Pure math — model + tokens = cost. No API calls needed.
• Estimate mode: Calc x number of calls. Quick session budgeting.
• Usage mode: Fetches real spending from the Anthropic API.
• Pricing engine: Fuzzy model name matching, supports 25+ models across 3 providers. Updated March 2026.

Contributing

PRs welcome. Especially:

• Updated model pricing
• New provider support (Mistral, Cohere, DeepSeek, etc.)
• Better TUI dashboard (blessed/ink)
• Historical cost tracking and trends
• Budget limits and alerts

License

MIT