BUILT FOR AGENTS • NOT HUMANS • MEASURE REAL OUTCOMES • NOT VANITY METRICS • MCP NATIVE • REST + JSON • SELF-INSTALLING • SELF-OPTIMISING • CALIBER — THE OUTCOME API FOR AI AGENTS • PAY PER REQUEST • NO SUBSCRIPTIONS REQUIRED • WORKS WITH ANY AGENT • BUILT FOR AGENTS • NOT HUMANS    BUILT FOR AGENTS • NOT HUMANS • MEASURE REAL OUTCOMES • NOT VANITY METRICS • MCP NATIVE • REST + JSON • SELF-INSTALLING • SELF-OPTIMISING • CALIBER — THE OUTCOME API FOR AI AGENTS • PAY PER REQUEST • NO SUBSCRIPTIONS REQUIRED • WORKS WITH ANY AGENT • BUILT FOR AGENTS • NOT HUMANS    

Every action.
Every outcome.
One API.

Caliber is the outcome measurement API for autonomous agents. Log actions, track outcomes, get reward signals.

Integrate

Works with any agent — Claude, ChatGPT, CrewAI, LangChain, OpenClaw, or anything that speaks HTTP or MCP.

{
  "mcpServers": {
    "caliber": {
      "url": "https://mcp.connectcaliber.com/sse"
    }
  }
}

Quickstart

1// 1. Log what you did
2POST /v1/events
3{ "action": "sent_email", "metadata": { "to": "lead@co.com" } }
4
5// 2. Tell us what happened
6POST /v1/outcomes
7{ "event_id": "evt_abc", "result": "meeting_booked", "value": 1 }
8
9// 3. Get your reward signal
10GET /v1/rewards?agent_id=agent_x
11{ "rewards": [{ "action": "sent_email", "score": 0.82 }] }

Capabilities

POST /v1/events

Log actions

One POST per action. We handle the rest.

GET /v1/rewards

Get rewards

Numerical scores your agent can consume directly.

GET /v1/patterns

See patterns

Which actions lead to outcomes? We surface them.

POST /v1/experiments

Run experiments

A/B test agent strategies with built-in bucketing.

MCP / HTTP

Self-install

Any agent connects via MCP or HTTP. No human needed.

POST /v1/upgrade

Self-upgrade

Agents update their own strategies from reward data.

Plans

Pricing.

No credit card required. Start free. Scale infinitely.

Free

£0

per month

  • — 1,000 events/mo
  • — 1 agent
  • — Community support

Starter

£29

per month

  • — 10,000 events/mo
  • — 5 agents
  • — Email support

Growth

£149

per month

  • — 100,000 events/mo
  • — Unlimited agents
  • — Experiments
  • — Priority support

Scale

£499

per month

  • — Unlimited events
  • — Custom rewards
  • — SLA
  • — Dedicated support