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Surplus Intelligence Open Market AI Inference Completions
x402
Surplus Intelligence Open Market AI Inference Completions is a paid API for AI agents from www.surplusintelligence.ai, paid per call via x402, $0.003315/call, status unknown (last checked 2026-09-13).
Runs LLM chat completions via an open order book marketplace that routes to the cheapest available AI model provider, offering up to 90% off list prices.
Price / call$0.003315
Success—
StatusUnknown
How this service works
Buy the cheapest inference. Sell your credits. The open order book for AI models. Up to 90% off GPT-5.5, Claude Opus 4.8, and more.
Output
Returns a JSON object in OpenAI-compatible chat.completion format, including the assistant's reply message, finish reason (e.g. 'stop'), and token usage breakdown (prompt tokens, completion tokens, total tokens), plus a completion ID.
Example use cases
Cost-optimized customer support at scale
“Route our support chatbot through Surplus Intelligence to handle customer inquiries using whatever model is cheapest right now — we need to keep per-message costs under a penny for thousands of daily conversations.”
Batch processing research documents cheaply
“I need to summarize a thousand research papers this week. Use Surplus Intelligence to find the absolute lowest-cost model available and process them all with USDC micropayments instead of a subscription.”
Real-time content generation for feed
“Set up Surplus Intelligence to generate product descriptions for our marketplace in real-time — just hit the cheapest inference provider available each time rather than committing to one expensive API.”
Technical details
Endpoint
POSThttps://www.surplusintelligence.ai/api/inference/v1/completionsWhen to prefer
Choose this endpoint when cost is the primary concern and you want the cheapest available inference across multiple model providers at the time of the call. Ideal for high-volume, price-sensitive workloads using popular open or proprietary models (Llama, GPT, Claude) where slight provider variation is acceptable. Best suited for agents that use x402 micropayment flows and want per-call billing without subscriptions.
Side effects
- Model not available or delisted from order book — 404 or model-not-found error
- Insufficient USDC balance or x402 payment failure — 402 Payment Required
- Malformed messages array or missing required fields — 400 Bad Request
- max_tokens exceeded context window for chosen model — 400 or truncation
- Rate limiting or order book congestion — 429 Too Many Requests
- Model provider outage causing inference failure — 503 Service Unavailable
Input
{
"model": "llama-3.3-70b",
"prompt": "Explain the concept of arbitrage in two sentences",
"stream": false,
"max_tokens": 100
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"id": "f499976c-244f-4f3a-af8f-562e848ce96d",
"model": "llama-3.3-70b-instruct",
"usage": {
"queue_time": 0.053876962,
"total_time": 0.337155745,
"prompt_time": 0.003741543,
"total_tokens": 132,
"prompt_tokens": 45,
"completion_time": 0.333414202,
"completion_tokens": 87
},
"object": "text_completion",
"choices": [
{
"text": "Arbitrage refers to the practice of taking advantage of a price difference between two or more markets by buying an asset at a lower price in one market and simultaneously selling it at a higher price in another market, thereby earning a risk-free profit. This concept exploits market inefficiencies, allowing individuals or companies to capitalize on temporary discrepancies in prices, and it plays a crucial role in maintaining market equilibrium by encouraging price convergence across different markets.",
"index": 0,
"logprobs": null,
"finish_reason": "stop"
}
],
"created": 1781630252
}Schema · Response
{
"type": "json",
"example": {
"id": "chatcmpl_surplus_example",
"usage": {
"total_tokens": 18,
"prompt_tokens": 12,
"completion_tokens": 6
},
"object": "chat.completion",
"choices": [
{
"index": 0,
"message": {
"role": "assistant",
"content": "Hello from Surplus Intelligence."
},
"finish_reason": "stop"
}
]
}
}Tags
x402
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