> _ P402 DEVELOPERS

Build AI features with
cost ownership.

P402 gives developers an OpenAI-compatible meter for AI usage, margin, workflow attribution, outcomes, and optional settlement.

Start free Read quickstart

Metadata-only by default. No prompt storage required. Settlement is optional.

The developer problem

AI cost is invisible until it bites margin.

Engineering ships AI features without per-call attribution. Finance sees the invoice. The team cannot tell which feature, which customer, which workflow, or which retry caused the cost. P402 records that attribution at the moment of the call.

What you get

Meter AI calls

OpenAI-compatible endpoint. Wrap your existing client. Every call becomes an economic event with owner, tokens, cost, and outcome.

Track AI feature margin

Record cost per feature, per customer, per workflow. See where margin lands and where it leaks.

Add workflow attribution

Pass workflow_id, customer_id, feature_id on every call. Filter the ledger by any owner dimension.

Record outcomes

Report whether the output was accepted, revised, escalated, or failed. P402 ties outcome to cost.

Enable settlement later

Meter works without settlement. Add x402 receipts when AI work becomes payable. No lock-in.

Your first metered event

01
Create a P402 key.
Sign in, generate the key. The key returns exactly once.
02
Wrap your AI call through the OpenAI-compatible endpoint.
Point baseURL to https://p402.io/v1 and use the existing OpenAI SDK pattern.
03
Attach workflow_id, customer_id, feature_id metadata.
Owner taxonomy is indexed on every event. Filter the ledger by any dimension.
04
Report the outcome. View the event in the spend ledger.
Send accepted, revised, escalated, or failed. The event lands in the dashboard with cost and attribution attached.

Example

import OpenAI from 'openai';

const client = new OpenAI({
  apiKey: process.env.P402_API_KEY,
  baseURL: 'https://p402.io/v1',
});

const completion = await client.chat.completions.create({
  model: 'gpt-4o-mini',
  messages: [{ role: 'user', content: 'Summarize Q3 revenue.' }],
  // Attribution travels with the call.
  metadata: {
    workflow_id: 'finance.summary',
    customer_id: 'cust_123',
    feature_id: 'q3_brief',
  },
});

const eventId = completion.id;

// Report the outcome once your app accepts or rejects the output.
await fetch(`https://p402.io/api/v2/meter/events/${eventId}/outcome`, {
  method: 'POST',
  headers: {
    Authorization: `Bearer ${process.env.P402_API_KEY}`,
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({ outcome: 'accepted' }),
});

Privacy

P402 meters economics, not content.

Metadata-only mode is the default. Prompts, files, documents, source code, and responses stay inside your environment. P402 records the owner, cost, tokens, budget, policy result, outcome, and evidence status of the call. Choose a different mode only when the tenant policy allows it.

metadata_onlyOwner, cost, tokens, budget, policy, outcome, and evidence status. No prompts. No responses. Default.
fingerprint_onlyAdds a hash fingerprint of prompt and response for dedup and replay protection. Content stays out.
redacted_tracePrompt and response retained after a redaction pass for fields the tenant policy allows.
private_gatewayYour environment hosts the inference, P402 records the economic event over a signed channel.
full_traceOpt-in. Prompts and responses retained verbatim with the event. Requires explicit tenant policy.

Read the trust posture

Sandbox and Build

Start in Sandbox. Move to Build when you ship.

Sandbox is free. Build is $49 per month. Build checkout is controlled by the billing rollout. Start free or request access.

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Optional settlement

Add settlement only when AI work is payable.

Meter works without settlement. USDC and wallets are only required for x402 receipts when AI work is sold to an end user or billed across a boundary. Build and ship the meter first. Add receipts when the work becomes payable.

Read about receipts

Developer resources

Quickstart

Six-step path from key generation to receipt reuse.

API keys

Reference for key generation, scopes, and rotation.

Meter

Canonical product page for the metering layer.

Monitor

Read-only dashboards for AI spend and attribution.

Control

Budgets, policy results, and review gates.