# Services from data.spencermcw.com on Zero > data.spencermcw.com serves 19 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/data.spencermcw.com Live health (JSON, refreshed every minute): https://www.zero.xyz/host/data.spencermcw.com/health.json ## Services - [OFAC SDN Crypto Address Change Feed](https://www.zero.xyz/c/ofac-sdn-crypto-address-change-feed-d1132f66/llms.txt): $0.02/call via x402. Returns per-publication change records (added, removed, or entry_updated) for crypto addresses on OFAC's Specially Designated Nationals (SDN) list, computed daily from OFAC's official SDN files. - [CMS NADAC Drug Acquisition Cost Lookup](https://www.zero.xyz/c/cms-nadac-drug-acquisition-cost-lookup-264fac0c/llms.txt): $0.01/call via x402. Returns the CMS National Average Drug Acquisition Cost (NADAC) per unit for a given NDC, including current price, generic equivalent pricing, and weekly price history since January 2025. - [Medicare Physician Fee Schedule Rate Lookup](https://www.zero.xyz/c/medicare-physician-fee-schedule-rate-lookup-43bebd97/llms.txt): $0.01/call via x402. Returns Medicare facility and non-facility allowed amounts for a CPT or HCPCS code at any US ZIP code or Medicare locality, including RVUs, GPCIs, and conversion factor details for 2025 onward. - [Medicare Physician Fee Schedule by Locality](https://www.zero.xyz/c/medicare-physician-fee-schedule-by-locality-28f3f2dc/llms.txt): $0.02/call via x402. Returns CMS Physician Fee Schedule allowed amounts for a billing code across all 109 Medicare payment localities, with national amount and min/max range. - [Medicare Part D Formulary & Plan Change Feed](https://www.zero.xyz/c/medicare-part-d-formulary-plan-change-feed-fbad1fcf/llms.txt): $0.05/call via x402. Returns a paginated feed of Medicare Part D formulary and plan changes detected monthly from CMS data, including drug additions/removals, tier changes, prior-auth, step-therapy, quantity-limit, and premium changes. - [Medicare Part D Drug Coverage Lookup by County](https://www.zero.xyz/c/medicare-part-d-drug-coverage-lookup-by-county-3f0c76d4/llms.txt): $0.02/call via x402. Returns all Medicare Part D plans (PDP and Medicare Advantage) covering a specific drug in a given county, with tier, prior authorization, step therapy, quantity limit, premium, and copay details for 2026 and 2027. - [OFAC SDN Sanctions Batch Address Screener](https://www.zero.xyz/c/ofac-sdn-sanctions-batch-address-screener-83f8d821/llms.txt): $0.05/call via x402. Screens up to 100 crypto addresses at once against OFAC's SDN sanctions list, returning match results updated daily. - [Medicare Physician Fee Schedule Change Feed](https://www.zero.xyz/c/medicare-physician-fee-schedule-change-feed-264cdeb6/llms.txt): $0.05/call via x402. Returns computed change records between CMS Medicare Physician Fee Schedule releases, covering RVU, conversion factor, GPCI, locality, and OPPS-cap fields, from 2025 onward. - [data.spencermcw.com Sales Tax Rate Lookup](https://www.zero.xyz/c/data-spencermcw-com-sales-tax-rate-lookup-7ea3c2d6/llms.txt): $0.005/call via x402. Returns the sales-tax rate for a US location (ZIP+4, ZIP, or street address) in Streamlined Sales Tax states - [Hospital Negotiated Payer Prices by Billing Code](https://www.zero.xyz/c/hospital-negotiated-payer-prices-by-billing-code-1536c2d6/llms.txt): $0.02/call via x402. Returns negotiated prices for a single billing code across payers and plan types in a specified US location - [Medicare Part D Plan Cost & Coverage Lookup](https://www.zero.xyz/c/medicare-part-d-plan-cost-coverage-lookup-e32f9a4b/llms.txt): $0.01/call via x402. Returns premium, deductible, service area, tier cost-sharing, and one drug's formulary terms for a specific Medicare Part D contract-plan-segment. - [OFAC SDN Sanctions Check for Crypto Address](https://www.zero.xyz/c/ofac-sdn-sanctions-check-for-crypto-address-a7507118/llms.txt): $0.005/call via x402. Checks whether a single cryptocurrency address appears on OFAC's Specially Designated Nationals (SDN) sanctions list, returning match details, programs, and history. - [CMS NADAC Drug Acquisition Cost Changes Feed](https://www.zero.xyz/c/cms-nadac-drug-acquisition-cost-changes-feed-8b75df91/llms.txt): $0.05/call via x402. Returns weekly changes in CMS NADAC per-unit drug acquisition costs and NDC listing status changes, with CMS's stated reason for each change. - [NADAC Drug Price Search by Name](https://www.zero.xyz/c/nadac-drug-price-search-by-name-592d1600/llms.txt): $0.01/call via x402. Search CMS's NADAC database by drug name to find matching NDCs, their counts, and the current per-unit cost range that pharmacies pay - [Hospital Posted Prices by Billing Code and Location](https://www.zero.xyz/c/hospital-posted-prices-by-billing-code-and-location-ed009272/llms.txt): $0.02/call via x402. Returns posted hospital prices for a single billing code (CPT, HCPCS, or MS-DRG) near a US ZIP code or lat/lon point - [SST Sales Tax Rate & Boundary Changes Feed](https://www.zero.xyz/c/sst-sales-tax-rate-boundary-changes-feed-1c03dcac/llms.txt): $0.05/call via x402. Returns a paginated feed of quarterly sales-tax rate and boundary changes across Streamlined Sales Tax (SST) member states - [Hospital Billing Code Price Comparison (Multi-Hospital)](https://www.zero.xyz/c/hospital-billing-code-price-comparison-multi-hospital-b1ede79c/llms.txt): $0.02/call via x402. Returns normalized, side-by-side price rows for a single billing code across up to 10 named hospitals. - [Batch US Sales Tax Rate Lookup (Streamlined Sales Tax)](https://www.zero.xyz/c/batch-us-sales-tax-rate-lookup-streamlined-sales-tax-e5285c2e/llms.txt): $0.1/call via x402. Returns sales-tax rates for up to 100 US ZIP/address locations in a single API call, covering Streamlined Sales Tax states - [Hospital Price & File Changes Feed](https://www.zero.xyz/c/hospital-price-file-changes-feed-e1104c24/llms.txt): $0.05/call via x402. Returns a paginated feed of detected changes to hospital pricing data and source files, filterable by time and cursor 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)