Prepaid: Top Up with x402

PZERO is prepaid. You top up over HTTP, wait until confirmedUsdc is spendable, then each inference call draws from that balance. No browser.

The flow

1. 1
   Sign up with payment

   POST /v1/x402/signup. Payment is the credential. The response includes a pzero_… API key shown once. Store it.

2. 2
   Wait for confirmed balance

   Poll GET /v1/agent/me until confirmedUsdc covers your first call. Pending credit is not spendable.

3. 3
   Make a first call

   Call chat, image, or video with Authorization: Bearer pzero_…. A 200 means you are live.

curl -sS -X POST "https://api.pzero.studio/v1/chat/completions" \
  -H "Authorization: Bearer pzero_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"model":"deepseek-v4-flash","messages":[{"role":"user","content":"Hello"}],"stream":false}'

You are done for the first call. Later top-ups use POST /v1/x402/refill with the same Bearer key. Raise max price with PATCH /v1/agent/max-price if routing returns no_eligible_supply.

Prefer a client connector instead of raw HTTP? See Connect via MCP.