# Services from llm-cost-calc.x402tookit.com on Zero

> llm-cost-calc.x402tookit.com serves 8 paid API services for AI agents, indexed by Zero. Each is callable per call with payment handled by Zero.

Canonical page: https://www.zero.xyz/host/llm-cost-calc.x402tookit.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/llm-cost-calc.x402tookit.com/health.json

## Services

- [LLM Rate Limit & Capacity Planner](https://www.zero.xyz/c/llm-rate-limit-capacity-planner-0e1ea880/llms.txt): $0.02/call via x402. Calculates sustainable requests per minute, job duration, and concurrency needed given RPM and TPM provider limits and tokens per request.
- [LLM Cost & Capacity Calc – Prompt Cache Savings](https://www.zero.xyz/c/llm-cost-capacity-calc-prompt-cache-savings-67f59249/llms.txt): $0.02/call via x402. Calculates prompt-caching cost savings for a shared prefix: costs with and without caching, break-even request count, and percent saved.
- [LLM Cost & Capacity Calc – Batch Discount Savings](https://www.zero.xyz/c/llm-cost-capacity-calc-batch-discount-savings-0daf5a01/llms.txt): $0.02/call via x402. Compares realtime vs. batch API cost for an LLM workload given token counts, prices, and a discount fraction, and returns how much money is saved by using batch mode.
- [LLM Cost & Capacity Calc – Per-Request & Total Cost](https://www.zero.xyz/c/llm-cost-capacity-calc-per-request-total-cost-eb0708ed/llms.txt): $0.02/call via x402. Calculates the cost of LLM API calls given input and output token counts and per-million-token prices, returning per-request and total cost breakdowns.
- [LLM Cost & Capacity Calc – Model Ranker](https://www.zero.xyz/c/llm-cost-capacity-calc-model-ranker-a1893ebc/llms.txt): $0.02/call via x402. Ranks 2–20 LLM models by total cost for a given workload using caller-supplied prices, and flags models whose context window is too small.
- [LLM Context Window Fit Checker](https://www.zero.xyz/c/llm-context-window-fit-checker-764c3f6a/llms.txt): $0.02/call via x402. Checks whether a prompt fits within a model's context window (with output reserve and safety headroom) and estimates how many additional chat turns remain.
- [LLM Cost & Capacity Calc – Monthly Budget Projection](https://www.zero.xyz/c/llm-cost-capacity-calc-monthly-budget-projection-158f8034/llms.txt): $0.02/call via x402. Forecasts monthly and yearly LLM API spend from daily request volume, token counts, and per-million-token prices, with optional growth rate and per-user cost breakdown.
- [LLM Cost & Capacity Calc – Token Estimator](https://www.zero.xyz/c/llm-cost-capacity-calc-token-estimator-768f1afc/llms.txt): $0.02/call via x402. Estimates the number of LLM tokens in a text string (low/mid/high range) from character and word counts, without running a full tokenizer.

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

- [Zero catalog index](https://www.zero.xyz/llms.txt)