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LLM API Cost Calculator
x402
LLM API Cost Calculator is a paid API for AI agents from api.strale.io, paid per call via x402, $0.0216/call, status unknown (last checked 2026-10-12).
Calculates the API cost for a given LLM prompt and completion across 14 models, returning cheaper alternatives with savings percentages.
Price / call$0.0216
Success—
StatusUnknown
How this service works
Calculate LLM API cost for a prompt+completion across 14 models. Returns cheaper alternatives with savings percentages. Algorithmic.
Output
Returns the estimated cost for the specified model and prompt/completion, plus a ranked list of up to 14 alternative models with their costs and percentage savings relative to the chosen model.
Example use cases
Example prompt
“How much would it cost to run this prompt on gpt-4o: 'Summarize the following document in 3 bullet points' with about 500 prompt tokens and 150 completion tokens, and show me cheaper alternatives with their savings?”
Technical details
Endpoint
GEThttps://api.strale.io/x402/llm-cost-calculate?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent or developer needs to compare LLM API pricing across multiple models for a given input size, or wants to identify cost-saving alternatives to a currently used model. Ideal for cost optimization workflows and budget estimation before scaling LLM usage.
Side effects
- Missing required 'model' query parameter returns a validation error
- Unrecognized model name may return null cost or an error
- Providing neither prompt_text/completion_text nor token counts may result in a zero-cost estimate
- Network or payment failure (402) if USDC payment is not provided or fails
Input
{
"model": "gpt-4o",
"prompt_text": "Summarize the following document in 3 bullet points: Artificial intelligence is transforming industries by automating tasks and improving decision-making processes.",
"prompt_tokens": 500,
"completion_tokens": 150
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object |
Output
{
"_meta": {
"payment": {
"method": "x402",
"price_usd": 0.0216,
"settlement_id": "0x598fad3712b4ddb172a6f99f93d49c757856dfd09087281833ed51345c35e169"
},
"capability": "llm-cost-calculate",
"latency_ms": 0,
"provenance": {
"source": "algorithmic",
"fetched_at": "2026-06-13T04:25:42.340Z"
}
},
"model": "gpt-4o",
"cost_usd": 0.00275,
"input_tokens": 500,
"total_tokens": 650,
"model_pricing": {
"input_per_1k": 0.0025,
"output_per_1k": 0.01
},
"output_tokens": 150,
"context_window": 128000,
"cheaper_alternatives": [
{
"model": "gemini-1.5-flash",
"cost_usd": 0.000083,
"context_window": 1000000,
"savings_percent": 97
},
{
"model": "gpt-4o-mini",
"cost_usd": 0.000165,
"context_window": 128000,
"savings_percent": 94
},
{
"model": "claude-3-haiku",
"cost_usd": 0.000313,
"context_window": 200000,
"savings_percent": 89
},
{
"model": "llama-3-70b",
"cost_usd": 0.000414,
"context_window": 8192,
"savings_percent": 85
},
{
"model": "gpt-3.5-turbo",
"cost_usd": 0.000475,
"context_window": 16385,
"savings_percent": 83
}
]
}Tags
x402
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