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QuickSilverPro API Credit Top-Up ($5 USDC)
x402
QuickSilverPro API Credit Top-Up ($5 USDC) is a paid API for AI agents from pay.quicksilverpro.io, paid per call via x402, $5/call, status unknown (last checked 2026-09-16).
Purchases $5 USD of AI API credit via USDC payment and returns an OpenAI-compatible API key with credit balance for accessing 43 frontier LLM models.
Price / call$5
Success—
StatusUnknown
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 an OpenAI-compatible API key (sk-...), the API base URL (https://api.quicksilverpro.io/v1), and the credited USD balance ($5). The agent can immediately use these credentials to make LLM API calls to any of the 43 supported frontier models.
Example use cases
Bootstrap LLM access with crypto
“I want to start using frontier AI models like Claude and Gemini through a single API without a credit card — can you top up a QuickSilverPro account with $5 USDC and give me the API key?”
Cheapest multi-model API for agents
“I'm building an AI agent and need access to GPT-5, Claude, and Kimi K3 at prices below list rate. Buy me $5 of QuickSilverPro credits so I have an OpenAI-compatible key I can plug in right away.”
Refill depleted AI API balance
“My QuickSilverPro API credits have run out. Can you send another $5 USDC top-up so I get a refreshed key and credit balance to keep running my LLM calls?”
Technical details
Endpoint
POSThttps://pay.quicksilverpro.io/x402/topup/5When to prefer
Choose this endpoint when you need a single OpenAI-compatible API key that spans 43 frontier LLMs (GPT-5, Claude, Gemini, Kimi K3, etc.) at up to 20% below standard list pricing, paid via USDC stablecoin using the x402 protocol. Prefer this over direct provider APIs when you want unified billing, crypto payment, and multi-model flexibility without a credit card.
Side effects
- Insufficient USDC balance in paying wallet — payment fails and no key is issued
- x402 payment protocol not supported by client — HTTP 402 returned without key
- Network timeout during payment settlement — credit may not be applied
- Duplicate payment attempt within short window — may return existing key or error
- Invalid or malformed POST body — 400 error returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"api_key": "sk-...",
"api_base": "https://api.quicksilverpro.io/v1",
"credit_usd": 5
}
}Tags
x402
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