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x402-services Chat Pro — Multi-Model Frontier AI Completion
x402
x402-services Chat Pro — Multi-Model Frontier AI Completion is a paid API for AI agents from x402-services-production.up.railway.app, paid per call via x402, $0.03/call, status unknown (last checked 2026-09-15).
Pay-per-call frontier LLM chat completions (GPT-4o, Claude Sonnet 4, Gemini 2.5 Pro, DeepSeek R1, Grok 3) via OpenAI-compatible messages, payable in USDG or USDC
Price / call$0.03
Success—
StatusUnknown
How this service works
Frontier-model chat completion via x402 (gpt-4o, claude-sonnet-4, gemini-2.5-pro, deepseek-r1, grok-3). OpenAI-compatible messages. Payable in USDG on Robinhood Chain or USDC anywhere. Caps: 6k chars in / 800 tokens out.
Output
Returns an assistant message containing the frontier model's text response. The response is limited to 800 output tokens. The specific model used determines reasoning depth and style. The response follows OpenAI-compatible chat completion format.
Example use cases
On-demand frontier reasoning for agents
“Use DeepSeek R1 to reason through this multi-step math problem and show your work: if a portfolio of $50,000 grows at 7% annually for 15 years with monthly compounding, what is the final value?”
Draft professional email with Claude
“Have Claude Sonnet 4 write a professional but friendly follow-up email to a client who hasn't responded in two weeks — keep it under 150 words and don't sound desperate.”
Summarize research with Gemini 2.5 Pro
“Use Gemini 2.5 Pro to summarize the key findings and limitations from this academic abstract in plain English for a non-technical audience: [paste abstract].”
Technical details
Endpoint
POSThttps://x402-services-production.up.railway.app/api/ai/chat-proWhen to prefer
Choose this endpoint when you need pay-per-call access to frontier models (GPT-4o, Claude Sonnet 4, Gemini 2.5 Pro, DeepSeek R1, Grok 3) without committing to a monthly subscription, especially when paying in USDC or USDG on-chain. Ideal for AI agents that need occasional high-quality reasoning, drafting, or summarization at $0.03 per call. Best when input fits within 6k chars and a concise 800-token response is sufficient. Prefer over direct provider APIs when stablecoin payment and a unified multi-model interface matter.
Side effects
- Input exceeds 6,000 character limit — request rejected
- Model name not recognized or unavailable — returns error
- Insufficient USDC/USDG payment — 402 Payment Required response
- Output truncated at 800 token cap — partial answers for long tasks
- Network timeout if upstream model provider is slow
- Invalid messages array format — schema validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Tags
x402
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