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Zippopotam

by io.github.pipeworx-io
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Zippopotam MCP — wraps Zippopotam.us ZIP/postal code API (free, no auth)

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Status
Unhealthy
Uptime
31.2% over 39 days
Last Tested
Transport
Streamable HTTP
URL
Repository
pipeworx-io/mcp-zippopotam
GitHub Stars
0
Server Listing
Zippopotam MCP

TDQS

A3.9/5.0

Scored across 33 tools

Disambiguation4/5

Most tools target clearly distinct resources and actions (memory CRUD, subscription lifecycle, entity resolution, ZIP lookup, Polymarket analytics), and descriptions actively steer selection. However, the ask_pipeworx / ask_pipeworx_beta / ask_pipeworx_grounded trio overlaps (beta is currently identical to stable), and discover_tools vs suggest_questions are close cousins, so a few pairs invite misselection.

Naming Consistency4/5

Nearly every tool uses snake_case with a verb-first or noun-first convention (ask_pipeworx, compare_entities, polymarket_arbitrage, lookup_zipcode, validate_claim). Minor deviations like ai_visibility_check and pipeworx_feedback buck the verb_noun pattern but remain readable and internally coherent.

Tool Count2/5

33 tools is heavy for a single MCP surface and exceeds the 25-tool threshold where cognitive load and selection errors rise. Even though the server spans many domains, several tools are variants or meta-helpers that could be consolidated, making the count feel bloated.

Completeness4/5

The surface covers a broad data-gateway lifecycle: discovery (discover_tools, suggest_questions), research/answering, entity resolution, memory (remember/recall/forget), subscriptions (subscribe/list/unsubscribe/recent_alerts), domain-specific analytics, and feedback. Minor gaps exist (e.g. no explicit update for stored memory beyond overwrite, thin geocoding coverage beyond city/ZIP), but agents can work around them.

Tool Schema Changelog

Recent tool additions, removals, and schema changes observed during successful MCP inspections.

  1. 2 tool updates
    • Changedbet_research2 fields changed
      • changedInput schema / examples
        Previous value: -[
-  {
-    "market": "will-bitcoin-reach-100k-in-july-2026"
-  },
-  {
-    "market": "https://polymarket.com/event/will-bitcoin-hit-150k-by-june-30-2026"
-  }
-]New value: +[
+  {
+    "market": "will-kristi-noem-win-the-2028-republican-presidential-nomination"
+  },
+  {
+    "market": "https://polymarket.com/event/will-kristi-noem-win-the-2028-republican-presidential-nomination"
+  }
+]
      • changedInput schema / properties / market / description
        Previous value: -"Polymarket slug (\"will-bitcoin-hit-150k-by-june-30-2026\"), full URL (\"https://polymarket.com/event/...\"), or question text (\"Will Bitcoin hit $150k by June 30?\")"New value: +"Polymarket slug (\"will-kristi-noem-win-the-2028-republican-presidential-nomination\"), full URL (\"https://polymarket.com/event/...\"), or question text (\"Will Bitcoin hit $150k?\"). Dated slugs stop resolving once they settle — Polymarket de-indexes resolved markets — so prefer an undated one."
    • Changedpolymarket_kalshi_spread2 fields changed
      • changedInput schema / examples
        Previous value: -[
-  {
-    "topic": "fed"
-  },
-  {
-    "topic": "btc"
-  }
-]New value: +[
+  {
+    "topic": "fed"
+  },
+  {
+    "topic": "btc"
+  },
+  {
+    "topic": "bitcoin"
+  },
+  {
+    "topic": "fed rate decision"
+  }
+]
      • changedInput schema / properties / topic / description
        Previous value: -"Pre-mapped: fed | btc | cpi | gdp | sp500 | recession | next_pope | next_uk_pm | next_israel_pm | 2028_president"New value: +"Subject to compare. Canonical keys: fed | btc | eth | cpi | gdp | sp500 | recession | next_pope | next_uk_pm | next_israel_pm | 2028_president — but aliases and keywords resolve too (\"bitcoin\", \"fed rate decision\", \"ethereum\", \"inflation\", \"s&p 500\", \"us recession\", \"next pope\", \"2028 election\"). Check resolution.topic_matched_by in the response: \"exact\"/\"alias\" is a curated pairing, \"phrase\"/\"token\" is a keyword guess."
  2. 1 tool update
    • Changedentity_profile3 fields changed
      • changedInput schema / properties / type / description
        Previous value: -"Entity type. Only \"company\" supported today; person/place coming soon."New value: +"\"company\" or \"ticker\" — both are accepted and behave identically; `value` can be a ticker, CIK, or company name either way. person/place coming soon."
      • changedInput schema / properties / type / enum
        Previous value: -[
-  "company"
-]New value: +[
+  "company",
+  "ticker"
+]
      • changedInput schema / properties / value / description
        Previous value: -"Ticker (e.g., \"AAPL\") or zero-padded CIK (e.g., \"0000320193\"). Names not supported — use resolve_entity first if you only have a name."New value: +"Ticker (e.g., \"AAPL\"), zero-padded CIK (e.g., \"0000320193\"), or company name (e.g., \"Moderna\") — names resolve via SEC EDGAR company-name match."
  3. 1 tool update
    • Changedresolve_entity1 field changed
      • changedInput schema / properties / value / description
        Previous value: -"For company: ticker (AAPL), CIK (0000320193), or name. For drug: brand or generic name (e.g., \"ozempic\", \"metformin\")."New value: +"For company: ticker (AAPL), CIK (0000320193), or name. For drug: brand or generic name (e.g., \"ozempic\", \"metformin\"). Pass the ENTITY NAME ONLY — for a bond that is the ISSUER exactly as printed (\"NEW YORK ST DORM AUTH\"), never the question's full noun phrase (\"NEW YORK ST DORM AUTH revenue bonds\"): the FIGI lookup matches instrument names, so trailing security-class words match nothing."

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