---
title: "Existing B2B accounts only: top up the account balance with USDC on Base over x402 v2 (402 first, then PAYMENT-SIGNATURE)"
method: POST
path: "/v1/credits/x402"
---

# Existing B2B accounts only: top up the account balance with USDC on Base over x402 v2 (402 first, then PAYMENT-SIGNATURE)

`POST /v1/credits/x402`

## Request

- Base URL: `https://agents.alphaquantlabs.ai`
- URL: `https://agents.alphaquantlabs.ai/v1/credits/x402`
- Auth: one of:
  - HTTP bearer
  - API key in header `X-API-Key`

## Request body

- object
  - `pack` 'starter' | 'standard' | 'volume' | 'scale', required

## Response `200`

credited, with the settlement transaction

## Other responses

- `402`: PAYMENT-REQUIRED

---

[API](https://skmtc.dev/alphaquantlabs/apis/aql-propertycheck-property-intelligence-due-diligence-report.md) · [All operations](https://skmtc.dev/alphaquantlabs/apis/aql-propertycheck-property-intelligence-due-diligence-report/llms.txt) · [OpenAPI document](https://skmtc.dev/alphaquantlabs/apis/aql-propertycheck-property-intelligence-due-diligence-report/revisions/97e2fb7774f8?raw)