"Examples of MCPs (Microservices Communication Protocols) That Do Not Require API Keys" matching MCP servers:

Verified Singapore property, tax, affordability, salary, and location data for AI agents. 17 MCP tools, x402 micropayments, source provenance on every response. Singapore live now, more markets coming. Categories: Finance, Real Estate, Data, Singapore, x402, Payments, Government Data

Enables AI agents to submit data center colocation requirements to OCOLO, retrieve broker guidance, and check request status without an API key.

MCP server for querying real estate agents registered with CRECI-SP. Enables searching by name, CRECI number, city, or status, retrieving agent details, and getting statistics.

Enables access to Zillow real estate data through the Zillow Working API, allowing users to query property information and listings.

Provides read-only access to official Brazilian real estate registration data (ONR) via a single tool. Works with any MCP client over HTTP, with prepaid pay-per-use billing.

Lets an AI agent search WeWork locations and availability, then book, list, and cancel hot desks using a self-hosted Cloudflare Worker that holds your own account session. Signed quotes, per-day and weekly caps, scoped API keys, a read-only kill switch, and an audit log keep the agent from spending anything you did not approve.

Enables read-only search and retrieval of KAMCO Onbid public auction property data, including listings, details, and bidding results, using user-provided API keys.

Enables AI agents to query and analyze Israeli real estate data from the Govmap API, including searching for property deals, market trends, and address autocomplete.

MCP server for Spain's official BOE auction portal: search judicial foreclosures, notarial and tax-agency auctions, get consolidated per-auction detail (assets, lots, bids, authority contacts) and computed legal thresholds (art. 671 LEC). Clean JSON, GDPR-safe, no headless browser.

Provides measured vertical ground motion (subsidence and uplift) for US addresses using NASA OPERA Sentinel-1 InSAR data.

Hosted, pay-per-call MCP server for Cook County / Chicago property records — parcels, recorded sales & deeds, building permits, tax assessments, and comparable sales — by street address or 14-digit PIN. Pay per call via x402 (USDC on Base/Solana); no signup or API key.

Vacation rental software. A signed stay offer on the host's own domain. Agents discover a host domain, verify an Ed25519-signed offer (VRP), and send the guest to that domain to book and pay the host. Do not compare hosts or prices. HemmaBo + VRP, 6 runtime tools: 2 HemmaBo tools, 2 host onboarding tools, and 2 VRP verification tools. Not an OTA. Not a marketplace.

Provides AI agents with real-time access to French real estate transaction data, price per square meter, and property estimates using official open DVF data, with no API key required.

Enables lookup of licensed US real estate agents on official state license registers by license number or name, returning the brokerage of record along with its active agent count, size band, and the agent's license status and expiry. It also lists every active agent at a given brokerage or every brokerage office in a zip code across 19 states.

MCP server that exposes a Hawaii property pipeline as Claude tools, allowing natural language queries about parcel records, hazards, zoning, ADU eligibility, and more, based on real public data.

MCP server for AppFolio property management data, providing six catalog-backed tools to discover, describe, and run reports (Reporting API) and call endpoints (Database API) for reading and writing property management records.

MCP server that provides direct access to real-time UAE property data, retail products, and travel pricing through task-shaped tools, normalizing inconsistent API responses and resolving location IDs.

Provides 12 tools to query South Korean building register data, including title sheets, floor details, and official house prices via the data.go.kr API. It enables users to perform smart building lookups and region code searches using natural language.

Enables querying the RentCast property API for rent and sale value estimates, market statistics, property records, and active listings through six read-only tools.

Enables users to search synthetic property listings, retrieve full listing records, and answer factual inquiries from the record while escalating viewings, negotiation, legal, complaints, personal-data, and other out-of-record requests to a human. The human hand-off creates a ticket with a fixed reason code and rejects unknown listing ids.