# Qwen — x402.press

> Qwen AI inference without an API key or credit card.

Host: https://qwen.x402.press
Page: https://x402.press/services/qwen/
State: sellable
State note: Sellable as of 2026-10-30: GET /health answers 200 and every listed model/operation returns a 402 quote in the live handshake (measured 2026-10-30T23:10Z, see quote_basis).

## Price — exact (what a fixed call costs)

| chain | asset | exact USD |
|---|---|---|
| Base | USDC/EURC | 0.00875 |
| Arbitrum | USDC | 0.0075 |
| Polygon | USDC | 0.00625 |
| Avalanche | USDC | 0.0025 |
| Ethereum | USDC | 3.75 |
| Robinhood | USDG | 0.00875 |
| Arc | USDC | 0.00875 |

Metered ceiling on Base at max_tokens: 1000: 0.256125 USD (the highest of this service's models; per-model ceilings are in the JSON).
The same request with max_tokens unset tops out at 1.576368 USD — that authorises the model's whole output allowance, so it is a worst case, not a price. Every chain's ceilings are in https://x402.press/services/qwen.json under quotes[].ceilings[].

Measured: 2026-10-30T23:28:43Z (unpaid request -> 402 Payment-Required header (first round of the handshake only; nothing signed, nothing settled)).

## Operations

- POST https://qwen.x402.press/v1/chat/completions — OpenAI-compatible chat completions. Price follows the requested model: qwen3.8-flash bills on the DeepSeek tier (same price as deepseek.x402.press), qwen3.8-max bills on the Exclusive tier (highest tier). Additional OpenAI parameters (temperature, max_tokens, top_p, frequency_penalty, presence_penalty, stop, etc.) are forwarded.

## Free endpoints

- GET /v1/models — List available models (qwen3.8-flash, qwen3.8-max)
- GET /qwen/feedback — Return the 50 most recent feedback entries
- POST /qwen/feedback — Submit feedback (response_id, rating 1-5, optional comment)

## Start

Send the request unpaid, read the 402, sign the amount it quotes, send it again. Nothing is charged for the first round.

## Review

Qwen: two model tiers, one endpoint, priced per call over x402: https://x402.review/2026/10/31/qwen-review/

Catalog: https://x402.press/catalog.json
Hub: https://x402.press/llms.txt