# Argo Hub — Machine-Payable LLM Inference (Premium)

> Argo Hub — Machine-Payable LLM Inference (Premium) is a paid API for AI agents from diomedes.tail1c6d58.ts.net, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-18).

Runs LLM inference on a private GPU fleet (Qwen3 8B–27B, VL 30B) with per-call USDC micropayment via the x402 protocol, settling on Base in seconds.

## Facts

- Endpoint: POST https://diomedes.tail1c6d58.ts.net/premium/llm
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-18
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/argo-hub-machine-payable-llm-inference-premium-ab3e6cfb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lDV3WKvk9E_95_L9hCgFY

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 argo-hub-machine-payable-llm-inference-premium-ab3e6cfb -d '<json body>'
```

Example prompt: Use the Argo Hub premium LLM endpoint to answer this question: 'What are the key differences between transformer and state-space models?' — send it as a POST with the question as the body and pay the $0.01 USDC fee automatically.

## When to prefer this

Choose this endpoint when your agent needs high-quality LLM inference (Qwen3 8B–27B or VL 30B) and can pay per call in USDC via the x402 protocol without needing a subscription or API key. It is especially well-suited for autonomous agents operating on Base that need to settle AI compute costs programmatically and in real time. Prefer it over OpenAI or Anthropic APIs when you want crypto-native payment rails, private GPU hosting, or the verifier-gated correctness guarantee available on the /premium/deep variant.

## Known failure modes

- Payment not received or insufficient USDC balance — returns 402 Payment Required
- Invalid or missing required input fields (description, mimeType, input.method) — returns 400 Bad Request
- Model generates an incorrect answer on /premium/deep — endpoint regenerates for free per verifier-gated correctness guarantee
- GPU fleet unavailable or overloaded — possible timeout or 503 Service Unavailable
- Malformed body or unsupported bodyType — returns 400 with schema validation error
- Facilitator settlement failure on Base — payment not confirmed, request rejected

## How this service works

x402-paid LLM APIs on a private GPU fleet (Qwen3.8-27B, VL 30B). USDC on Base, settle in seconds via a self-hosted facilitator. Unique: verifier-gated correctness on /premium/deep — wrong answers regenerated free. First call free, no wallet: POST /premium/first.

## Output

A JSON object containing a 'text' field with the model's generated response, 'elapsed_s' with the inference time in seconds, and 'model_tier' indicating the tier used (e.g. 'premium'). Payment is settled on-chain via USDC on Base before the response is returned.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "description",
  "mimeType",
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "method"
   ],
   "properties": {
    "body": {
     "type": "object"
    },
    "type": {
     "type": "string"
    },
    "method": {
     "type": "string"
    },
    "bodyType": {
     "type": "string"
    },
    "input_schema": {
     "type": "object"
    }
   }
  },
  "output": {
   "type": "object"
  },
  "mimeType": {
   "type": "string"
  },
  "description": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "application/json",
 "example": {
  "text": "...",
  "elapsed_s": 1.7,
  "model_tier": "premium"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/argo-hub-machine-payable-llm-inference-premium-ab3e6cfb/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from diomedes.tail1c6d58.ts.net](https://www.zero.xyz/host/diomedes.tail1c6d58.ts.net/llms.txt)