RealWorldAPIs MCP server

• compare_apisFree

  Compare 2–8 already-known APIs side by side using canonical catalog fields plus capability-graph summary fields such as verified capability count, physical consequences, approval relevance and irreversibility. Use get_api for the full decision profile of one API and search_capabilities for capability-level filtering. No missing value is inferred and Unknown remains Unknown.

• find_api_for_taskFree

  Find the best APIs for a natural-language physical-world task. Use this for open-ended task or outcome-based recommendations; use search_apis when you already know exact filters, get_api for one known API, or compare_apis for known candidates. Returns an authoritative canonical structured_results shortlist plus a best-effort AI comparison restricted to that shortlist. The canonical engine now applies Verified/High capability evidence before ranking: explicit hard requirements expressed with terms such as must, required, no or without can exclude a candidate only when verified evidence contradicts them. Unknown evidence remains eligible and is surfaced as uncertainty. requirements.mcp, openapi and auth are translated into explicit requirements; categories and capabilities remain task-shaping hints. free_tier and min_readiness are accepted for compatibility but are not hard filters.

• get_apiFree

  Retrieve one canonical API decision profile when you already know its name or slug. The response includes the full Verified/High capability profile with execution, access, approval, reversibility, physical-consequence and evidence fields. Exact slug or exact API name is preferred; a partial identifier is accepted only when it uniquely resolves to one record.

• search_apisFree

  Search the canonical registry when you already know keywords or exact requirements. All supplied filter groups combine with AND logic; array capability filters require every supplied value, and protocol fields match the exact Yes/No/Unknown status, so Unknown never satisfies Yes. Results include each API's capability_summary and direct decision-profile URL. Results are sorted by agent_readiness_score descending and then API name, with 1–20 results returned (default 10). Use search_capabilities when you need capability-level filters such as approval, physical consequence, sandbox or access friction.

• search_capabilitiesFree

  Search the canonical 770-capability Verified/High decision graph directly. Use this when the question is about what an agent can actually do and under what execution conditions: task/capability text, API, category, action type, acted-on object, human approval, physical consequence, irreversibility, sandbox, hardware dependency, access friction or setup. All supplied filter groups combine with AND logic; multiple values inside one array filter are alternatives (OR). Unknown remains Unknown and may be filtered explicitly by passing the literal value Unknown.

• verify_requirementFree

  Verify whether one specific API can satisfy one exact requirement using the canonical Verified/High capability graph plus linked assertion evidence. Returns YES, NO, PARTIAL or UNKNOWN with matched capability, access/setup prerequisites, approval, safety, reversibility, reliability, coverage and other requested dimensions; direct provider facts remain distinct from inferred policy assertions. Unknown remains Unknown.

• –Code scanremote-only server, no package to scann/a
• Live reliabilityremote reachable in 173ms20/20
• Tool poisoning6 tool descriptions checked15/15
• Auth qualityopen endpoint, read-only tools10/15
• Maintenancelast push 6 days ago15/15
• Maintainer identityendpoint served from the registry-verified namespace domain8/10

Safety score

91/100

higher than 85% of 48,255 servers

Tools

6

the typical server has 7

Tools that change things

0%

typical: 0%. Fewer write tools means less an agent can break

Uptime

100%

of our recent checks; the typical remote server answers 100%

Response time

49 ms

faster than 92% of 30,031 servers

Grade history

• 2026-10-03restoreB → Ascore 91

RealWorldAPIs: common questions

Is RealWorldAPIs MCP server safe?

Yes, by our scan: it is graded A (91/100). Read the RealWorldAPIs safety report

How do I install RealWorldAPIs?

It runs remotely at mcp.realworldapis.com. Add it to Claude Code, Cursor, VS Code or Claude Desktop with the snippets above, or call it through the mcp.market gateway without installing anything.

Does RealWorldAPIs need an API key?

Not as far as the registry entry and our scan can tell: no credentials are declared or required.

Is RealWorldAPIs maintained?

The last commit was 38 days ago (2026-09-27). The latest release is v3.0.1.

Is RealWorldAPIs up?

100% of our last 28 checks got an answer. We check remote servers about four times a day.

How does RealWorldAPIs compare with other MCP servers?

safety score 91/100 (higher than 85% of 48,255 servers); tools 6 (the typical server has 7); tools that change things 0% (typical: 0%. Fewer write tools means less an agent can break). Full comparison.