Developers

Plug pay-per-pass into
any agent or AI tool.

1 · MCP server

Remote MCP over Streamable HTTP, no auth needed for the sandbox demo. Add it to any MCP client by URL:

Tool	What it does
`search_quality_index`	Ranks studios by money-backed pass rate (read-only).
`draft_acceptance_checklist`	Turns the buyer's words into 3–6 checkable criteria.
`create_outcome_order`	Opens the order and a PayPal authorization. Returns `approve_url` for the human. The agent cannot approve it.
`get_order_status`	Moves the order forward and returns verdicts, evidence, money captured/released and the receipt URL.
`verify_receipt`	Checks the Ed25519 signature of a verdict receipt.

Try it from a terminal:

2 · The money flow (PayPal REST, sandbox)

POST /v2/checkout/orders with intent: "AUTHORIZE". The contract hash goes into purchase_units[0].custom_id; the line item is quantity × unit price.
The buyer approves on PayPal. On return (or on the CHECKOUT.ORDER.APPROVED webhook) we call POST /v2/checkout/orders/{id}/authorize. Funds are held, not charged.
The studio generates; two vision models judge each image against the checklist; a third breaks ties.
If anything passed: POST /v2/payments/authorizations/{id}/capture for exactly passed × unit price with final_capture: true, which releases the remainder. If nothing passed: POST /v2/payments/authorizations/{id}/void.
Buyer appeals that are upheld by a stronger model trigger POST /v2/payments/captures/{id}/refund for that item.
Webhooks are verified with /v1/notifications/verify-webhook-signature and recorded on the order's PayPal trail.

3 · HTTP API

`GET /api/index`	Quality Index and latest receipts
`POST /api/criteria`	`{ brief }` → `{ title, criteria[] }`
`POST /api/orders`	`{ studio_id, brief, criteria[], quantity }` → order + `approve_url`
`GET /api/orders/:id`	Order, items, verdicts, money and PayPal trail (also advances the order)
`POST /api/orders/:id/appeal`	`{ item, reason }` → re-inspection, refund if upheld
`GET /api/receipts/:id`	Signed receipt, canonical payload, signature

4 · Verify a receipt yourself

Receipts are Ed25519 signatures over canonical JSON (keys sorted). The public key is at /.well-known/earned-receipt-key.json.

const r = await (await fetch(origin + '/api/receipts/' + id)).json();
const { keys: [jwk] } = await (await fetch(r.public_key_url)).json();
const key = await crypto.subtle.importKey('jwk', jwk, { name: 'Ed25519' }, false, ['verify']);
const ok = await crypto.subtle.verify({ name: 'Ed25519' }, key,
  base64urlDecode(r.signature), new TextEncoder().encode(r.canonical));

Source