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DeepSeek V4 Flash Chat Completions via x402 (x402donghang)
x402
DeepSeek V4 Flash Chat Completions via x402 (x402donghang) is a paid API for AI agents from x402donghang.duckdns.org, paid per call via x402, $0.003/call, status down (last checked 2026-10-19).
Runs a DeepSeek V4 Flash chat completion request via an OpenAI-compatible API, billed at $0.003 USDC per call using the x402 payment protocol — no signup required.
Price / call$0.003
Success—
StatusDown
How this service works
Fresh crypto narrative research with market context and verifiable source URLs. Free BTC sample; custom radar $0.02/call via x402 USDC.
Output
Returns a standard OpenAI-compatible chat completion JSON object containing an 'id', 'model' (deepseek-v4-flash), 'object' (chat.completion), and a 'choices' array with the assistant's reply message, its role, content string, and a 'finish_reason' field (e.g. 'stop').
Example use cases
Pay-per-call agent reasoning step
“Use the cheap DeepSeek V4 Flash model to answer this reasoning question for me: 'A train leaves Chicago at 60 mph and another leaves New York at 80 mph — when do they meet?' Keep it under 200 tokens.”
No-signup LLM for quick prototyping
“I don't want to create an API account anywhere — just run this prompt through DeepSeek V4 Flash and return the reply: 'List five creative names for a productivity app aimed at developers.'”
AI agent pipeline inference on a budget
“My agent needs to classify this user message as either a complaint, a question, or a compliment, and explain why — run it through DeepSeek V4 Flash: 'Why does your app keep crashing every morning?'”
Technical details
Endpoint
POSThttps://x402donghang.duckdns.org/x402/v1/models/deepseek-v4-flash/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a low-cost ($0.003/call), no-signup, pay-as-you-go LLM for chat completions that is OpenAI-compatible and settles instantly via USDC on x402. It is ideal for AI agents that need to avoid subscription lock-in, prototype quickly with crypto micropayments, or embed inference steps inside automated pipelines without credential management overhead. Prefer alternatives if you need GPT-4-class reasoning, image inputs, or function calling.
Side effects
- Payment not included or insufficient USDC — returns HTTP 402 with payment instructions
- Invalid or missing 'messages' array — returns 400 validation error
- Model field not set to 'deepseek-v4-flash' — may return 404 or model-not-found error
- Upstream DeepSeek service unavailable — returns 502 or 503
- max_tokens too large for model context — may truncate or return error
- Network timeout if streaming is enabled but client disconnects early
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| model | string | Use "deepseek-v4-flash" |
| stream | boolean | |
| messages | array | |
| max_tokens | number |
Output
Schema · Response
{
"type": "json",
"example": {
"id": "chatcmpl-x402",
"model": "deepseek-v4-flash",
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello!"
},
"finish_reason": "stop"
}
]
}
}Tags
x402
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