Confirm payment

POST/v1/billing/confirm🔑 API key required

Finds your USDC transfer on-chain via the reference, verifies amount + destination (single-use), and activates the plan.

Response fields

Field	Type	Description
`activated`	boolean	True once the transfer is verified and the plan is granted.
`receipt`	string	The on-chain transfer signature (your receipt — explorer-linkable).
`subscription`	object	The updated subscription (status active, currentPeriodEnd = +30d).

409 payment_not_found until the transfer finalizes on-chain (poll for a few seconds). 409 payment_already_redeemed if that signature was already used.

← PreviousBuild the payment transaction Next →Get subscription

curl -X POST "https://www.quanaris.com/v1/billing/confirm" \
  -H "x-api-key: $QUANARIS_KEY" \
  -H "content-type: application/json" \
  -d '{  }'

const res = await fetch("https://www.quanaris.com/v1/billing/confirm", {
  method: "POST",
  headers: { "x-api-key": process.env.QUANARIS_KEY, "content-type": "application/json" },
  body: JSON.stringify({  })
});
const data = await res.json();

Response example

{ "activated": true, "receipt": "<tx-signature>", "subscription": { "plan": "builder", "status": "active", "currentPeriodEnd": "2026-07-06T…" } }