# Services from x402.presenceoperations.com on Zero

> x402.presenceoperations.com serves 3 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/x402.presenceoperations.com
Live health (JSON, refreshed every minute): https://www.zero.xyz/host/x402.presenceoperations.com/health.json

## Services

- [Presenceoperations Execution Cost Estimator](https://www.zero.xyz/c/presenceoperations-execution-cost-estimator-2a1fdcae/llms.txt): $0.0048/call via x402. Returns the size-weighted fill price, slippage in basis points, and book absorbability for executing a given notional in a perpetual futures market right now.
- [Perpetual Market Liquidity-Risk Profiler](https://www.zero.xyz/c/perpetual-market-liquidity-risk-profiler-a5c1dee3/llms.txt): $0.01/call via x402. Returns a full liquidity-risk profile for a named perpetual market: absorbable notional at four slippage tolerances on both sides, bid-ask spread, book imbalance, top-of-book concentration, open interest, and day volume — with explicit book-depth limits on every response.
- [Perpetual Funding Carry Cost Calculator](https://www.zero.xyz/c/perpetual-funding-carry-cost-calculator-b2a440e5/llms.txt): $0.01/call via x402. Returns the projected funding cost of holding a perpetual futures position over a specified horizon, including hourly funding rate, mark-to-oracle basis, open interest, and annualized rate.

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)