RealWorldAPIs
https://realworldapis-api.realworldapis.workers.dev/mcp ↗
Description
API discovery and selection for AI agents connecting to the physical world.
What our measurements say
RealWorldAPIs is a remote MCP server published at realworldapis-api.realworldapis.workers.dev. It has been probed 6 times since 9/13/2026. It answered in 6 of them (100.0%), a near-uninterrupted record. Median response time is 354 ms, placing it among the faster endpoints. It offers a narrow, focused set of 1 tools. On the protocol side it speaks the 2026-07-28 stateless spec.
Agent readability score
Can an LLM agent pick the right tool here — names, descriptions and parameter clarity are assessed.
Agent readability score
Agent readability score
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| Run | Era | Modern | ms | Legacy | ms | Versions |
|---|---|---|---|---|---|---|
| 2026-09-13 14:49:35 | Dual-era | 200 | 376 | 200 | 383 | 2026-07-28, 2025-11-25 |
| 2026-09-13 12:47:19 | Dual-era | 200 | 494 | 200 | 490 | 2026-07-28, 2025-11-25 |
| 2026-09-13 10:45:14 | Dual-era | 200 | 192 | 200 | 174 | 2026-07-28, 2025-11-25 |
| 2026-09-13 08:43:04 | Dual-era | 200 | 262 | 200 | 268 | 2026-07-28, 2025-11-25 |
| 2026-09-13 06:40:42 | Dual-era | 200 | 356 | 200 | 354 | 2026-07-28, 2025-11-25 |
| 2026-09-13 04:35:29 | Dual-era | 200 | 118 | 200 | 126 | 2026-07-28, 2025-11-25 |
Schema compliance
tools/list structure, inputSchema validity, and a functional smoke test — the components of the 0-100 score.
- tools/list schema valid
- inputSchema is valid JSON Schema
- Smoke test not run this round
- Cold-start: cold 51ms → warm 39ms (penalty 12ms)
Tools
Tools the server advertised in the latest measurement — measured, not catalog-claimed.
find_api_for_taskFind and rank 100 audited APIs for natural-language physical-world tasks across weather, geospatial, IoT, robotics, mobility, logistics, energy and environment. Returns grounded fit scores plus Agent Readiness, MCP/OpenAPI support, authentication, pricing and free-tier metadata. Put every structured must-have constraint inside the requirements object. When presenting results, use only returned RWAPIS facts; do not infer comparative reliability, performance, quality, coverage, ease of use, enterprise suitability, or free-tier generosity.
taskstringrequiredrequirementsobjectlimitinteger
Availability history
Each block is one measurement round. Green: working response. Amber: responded but the server was returning errors (5xx). Red: no response at all.
Era history
Each cell is one probe run. Faded cells are incomplete probes — one leg did not answer, so the era is inconclusive.
Response time history
The two probe legs separately: modern server/discover and legacy initialize.
Event log
Derived by comparing consecutive probes — changes in era, protocol version, build and reachability.
- Server build: 1.2.0 → 1.2.1
- Added to watch — era: Dual-era
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