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Spain's cadastre API is SOAP from 2003, so I built a JSON wrapper (+MCP)

prediohq.com

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Re: Spain's cadastre API is SOAP from 2003, so I built a JSON wrapper (+MCP)

#2

Post by guillermofc »

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.

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.

Re: Spain's cadastre API is SOAP from 2003, so I built a JSON wrapper (+MCP)

#5

Post by loloquwowndueo »

guillermofc wrote: post #2

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 ("100,0000…

Wow even the HN intro comment is slop.

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.

Re: Spain's cadastre API is SOAP from 2003, so I built a JSON wrapper (+MCP)

#7

Post by nickphx »

loloquwowndueo wrote: post #5
guillermofc wrote: post #2

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 ("100,0000…

Wow even the HN intro comment is slop. 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.

those honest caveats though.. lol

Re: Spain's cadastre API is SOAP from 2003, so I built a JSON wrapper (+MCP)

#8

Post by mejutoco »

loloquwowndueo wrote: post #5
guillermofc wrote: post #2

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 ("100,0000…

Wow even the HN intro comment is slop. 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.

I had to check

> Esta guía es para cuando quieres meterla en producción

This sounds pretty inappropriate, and a bit funny.

Re: Spain's cadastre API is SOAP from 2003, so I built a JSON wrapper (+MCP)

#9

Post by loloquwowndueo »

nickphx wrote: post #7
loloquwowndueo wrote: post #5

Earlier quoted context omitted.

Wow even the HN intro comment is slop. 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.

those honest caveats though.. lol

Beats the crap out of dishonest ones.

I hate AIs that start sentences with “honestly” or “I have to be honest”. Means they’re bullshitting you the rest of the time - which we all knew about anyway.

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