# QuickSilverPro API Credit Top-Up ($10 USDC)

> QuickSilverPro API Credit Top-Up ($10 USDC) is a paid API for AI agents from pay.quicksilverpro.io, paid per call via x402, $10/call, status unknown (last checked 2026-09-15).

Purchases $10 USD of API credit via crypto payment and returns an OpenAI-compatible API key and base URL for accessing 43 frontier AI models at up to 20% below list price.

## Facts

- Endpoint: POST https://pay.quicksilverpro.io/x402/topup/10
- Price: $10/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/quicksilverpro-api-credit-top-up-10-usdc-84b99487
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_UqXiKqJ4Ro8BWYLq0Krrn

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability quicksilverpro-api-credit-top-up-10-usdc-84b99487 -d '<json body>'
```

Example prompt: Top up my QuickSilverPro account with $10 USDC so I get an API key I can use to call GPT-5, Claude, and Gemini through a single OpenAI-compatible endpoint.

## When to prefer this

Choose this endpoint when you need programmatic, crypto-native (USDC) access to a broad set of frontier LLMs (43 models including GPT, Claude, Gemini, Kimi K3) through a single OpenAI-compatible API, especially when avoiding credit card requirements or seeking below-list pricing. Prefer it over direct OpenAI/Anthropic/Google APIs when you want multi-provider flexibility under one key and one balance, or when your workflow uses the x402 payment protocol.

## Known failure modes

- Insufficient or failed USDC payment — payment not confirmed on-chain, resulting in no key issued
- Invalid or malformed POST body — returns 400 error
- Payment protocol (x402) not supported by calling client — integration failure
- Duplicate or replayed payment transaction — may be rejected to prevent double-spend
- Service unavailability — 5xx error with no key returned

## How this service works

One API key for 45+ AI models (GPT-6 Astra, Claude Fable 5.1, Gemini 3.8 Flash, Qwen 3.8, GLM 5.3, DeepSeek V4), OpenAI-compatible. Agents top up prepaid credit with USDC on Base via x402 and get a key back in the same HTTP round-trip.

## Output

Returns a JSON object containing a provisioned API key (sk-... format), an OpenAI-compatible API base URL (https://api.quicksilverpro.io/v1), and the funded credit balance in USD ($10). The key can immediately be used with any OpenAI-SDK-compatible client to call any of the 43 supported frontier models.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method",
    "bodyType",
    "body"
   ],
   "properties": {
    "body": {
     "properties": {}
    },
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "POST",
      "PUT",
      "PATCH"
     ],
     "type": "string"
    },
    "bodyType": {
     "enum": [
      "json",
      "form-data",
      "text"
     ],
     "type": "string"
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "api_key": "sk-...",
  "api_base": "https://api.quicksilverpro.io/v1",
  "credit_usd": 10
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/quicksilverpro-api-credit-top-up-10-usdc-84b99487/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from pay.quicksilverpro.io](https://www.zero.xyz/host/pay.quicksilverpro.io/llms.txt)