GIS APIs using SOAP are often going to be ArcGIS Server based APIs. If I recall correctly, you can literally just check a box to expose a REST API as well. SOAP was also just a checkbox.
Spain's cadastre (the official property registry for land/buildings data) has a free
public API. The catch: it's SOAP/.asmx-era XML with three different services depending
on your input (reference, coordinates, or address), four different response shapes
discriminated by a counters block, business errors returned as HTTP 200 with the error
inside the XML, infra errors as HTTP 500 text/plain, decimal commas ("100,000000"),
and no documented rate limits or SLA.
Predio is the wrapper I built on top: one JSON contract for the three inputs, typed
stable errors (404/422/402 always JSON), cache with serve-stale so the upstream's
availability isn't yours, and an MCP server (Streamable HTTP) so agents can call it
directly. Prepaid per-call pricing, 250 calls/month free, no subscription.
Honest caveats: Spain only (and not the Basque Country/Navarre, which run their own
foral cadastres); no ownership data (that's legally protected); if you need one lookup
a month, just use the official site — I wrote a comparison that includes "when not to
use us": https://prediohq.com/guias/api-catastro-comparativa/
Happy to answer anything about wrangling government SOAP into something agents can use.
Also - I’m a native Spanish speaker, it’s probably the first slop page in Spanish I’ve ever seen and it’s … painful. Do your users a favor and please go through it and do some human-driven copy editing. As is this is barely intelligible.
https://github.com/AustinWise/mcp2ws
(This program is for comedy purposes only)
I wrote up everything I hit while integrating it (applies even if you never use my product): https://prediohq.com/guias/consumir-api-catastro-soap-json/
Predio is the wrapper I built on top: one JSON contract for the three inputs, typed stable errors (404/422/402 always JSON), cache with serve-stale so the upstream's availability isn't yours, and an MCP server (Streamable HTTP) so agents can call it directly. Prepaid per-call pricing, 250 calls/month free, no subscription.
Honest caveats: Spain only (and not the Basque Country/Navarre, which run their own foral cadastres); no ownership data (that's legally protected); if you need one lookup a month, just use the official site — I wrote a comparison that includes "when not to use us": https://prediohq.com/guias/api-catastro-comparativa/
Happy to answer anything about wrangling government SOAP into something agents can use.
Also - I’m a native Spanish speaker, it’s probably the first slop page in Spanish I’ve ever seen and it’s … painful. Do your users a favor and please go through it and do some human-driven copy editing. As is this is barely intelligible.
> Esta guía es para cuando quieres meterla en producción
This sounds pretty inappropriate, and a bit funny.