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Watt Chat Completions (Qwen3.5 4B / Qwen3 1.7B / 0.6B)
x402
Watt Chat Completions (Qwen3.5 4B / Qwen3 1.7B / 0.6B) is a paid API for AI agents from watt.area21.io, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-21).
Runs OpenAI-compatible chat completions using Qwen3 small language models on Watt's own infrastructure, billed per call in USDC via x402.
Price / call$0.001
Success—
StatusUnknown
Output
Returns an OpenAI-compatible chat completion object containing the assistant's generated message, finish reason, and token usage breakdown (prompt tokens, completion tokens, total tokens).
Example use cases
Lightweight agent reasoning step
“Use the Qwen3 1.7B model on Watt to summarize this paragraph in two sentences and extract the main topic, keeping it under 150 tokens.”
Pay-per-call chatbot response
“I need a friendly customer support reply to 'Where is my order?' — run it through the Watt Qwen3.5 4B model and cap the response at 200 tokens.”
Automated content drafting pipeline
“Draft a short product description for 'noise-cancelling wireless headphones' using the Qwen3 0.6B model on Watt, max 250 tokens — I want to pay per call rather than subscribe to a big API.”
Technical details
Endpoint
POSThttps://watt.area21.io/v1/chat/completions?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, pay-per-call OpenAI-compatible chat completion API without a monthly subscription, especially when using USDC on-chain payments (x402 protocol) or when specifically needing Qwen3-family small models (0.6B–4B) for cost-efficient inference tasks.
Side effects
- Insufficient USDC balance causes payment failure and 402 response
- max_tokens too large relative to available budget
- Unsupported model name returns 400 or 422 error
- Malformed messages array causes validation error
- Rate limiting or capacity issues on Watt's fleet return 429 or 503
Tags
x402
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