We track 45543 servers from the official MCP Registry. 29420 are hosted (remote); we have health-checked 29165 so far. 259 use templated URLs that need user-specific values and can't be checked. Of those checked, 16183 passed a full MCP handshake, 7846 are up but need credentials, and 5136 failed or were unreachable (last check 2026-10-17T22:40:35.436Z UTC). How we check.
| Server | Users (30 d) | Handshake | Auth | Tools | Latency | Last checked (UTC) | Category |
|---|---|---|---|---|---|---|---|
| JWT header.payload.sig shape, value discarded io.github.sadri-dridi/jwt-hdr | 0 | Healthy | None | 31 | 296 ms | 2026-10-17T21:55:33.809Z | agents-and-memory |
| Kelvin to celsius io.github.sadri-dridi/k-to-c | 0 | Healthy | None | 31 | 318 ms | 2026-10-17T21:55:33.809Z | agents-and-memory |
| JSON5 comment/key shape, body discarded io.github.sadri-dridi/json5-ok | 0 | Healthy | None | 31 | 243 ms | 2026-10-17T21:55:33.798Z | agents-and-memory |
| Julian day number io.github.sadri-dridi/julian-day | 0 | Healthy | None | 31 | 287 ms | 2026-10-17T21:55:33.798Z | agents-and-memory |
| JWT three-part shape, token discarded io.github.sadri-dridi/jwt-shape | 0 | Healthy | None | 31 | 285 ms | 2026-10-17T21:55:33.798Z | agents-and-memory |
| JSON Schema keyword count, body discarded io.github.sadri-dridi/json-schema-ok | 0 | Healthy | None | 31 | 271 ms | 2026-10-17T21:55:33.748Z | agents-and-memory |
| JSON type-tag count, values discarded io.github.sadri-dridi/json-type-ok | 0 | Healthy | None | 31 | 273 ms | 2026-10-17T21:55:33.725Z | agents-and-memory |
| JSON Check io.github.sadri-dridi/json-check | 0 | Healthy | None | 31 | 243 ms | 2026-10-17T21:55:33.329Z | agents-and-memory |
| JSON-LD @type count, body discarded io.github.sadri-dridi/jsonld-ok | 0 | Healthy | None | 31 | 243 ms | 2026-10-17T21:55:33.311Z | agents-and-memory |
| JSON top-level key count, values discarded io.github.sadri-dridi/json-keys-ok | 0 | Healthy | None | 31 | 747 ms | 2026-10-17T21:55:32.979Z | agents-and-memory |
| JSON Lines row count, body discarded io.github.sadri-dridi/json-lines-ok | 0 | Healthy | None | 31 | 680 ms | 2026-10-17T21:55:32.979Z | agents-and-memory |
| Pretty-print JSON shape, body discarded io.github.sadri-dridi/json-pretty-ok | 0 | Healthy | None | 31 | 324 ms | 2026-10-17T21:55:32.602Z | agents-and-memory |
| JPEG magic-byte check, file discarded io.github.sadri-dridi/jpeg-magic | 0 | Healthy | None | 31 | 392 ms | 2026-10-17T21:55:32.596Z | agents-and-memory |
| JS unicode-escape count, input discarded io.github.sadri-dridi/js-uesc | 0 | Healthy | None | 31 | 392 ms | 2026-10-17T21:55:32.596Z | agents-and-memory |
| JSON-LD script count, markup discarded io.github.sadri-dridi/json-ld-n | 0 | Healthy | None | 31 | 290 ms | 2026-10-17T21:55:32.596Z | agents-and-memory |
| JSON Pointer token count, path discarded io.github.sadri-dridi/json-ptr-ok | 0 | Healthy | None | 31 | 321 ms | 2026-10-17T21:55:32.596Z | agents-and-memory |
| Julian day number band io.github.sadri-dridi/jd-n | 0 | Healthy | None | 31 | 348 ms | 2026-10-17T21:55:32.585Z | agents-and-memory |
| JSON validity io.github.sadri-dridi/json-ok | 0 | Healthy | None | 31 | 269 ms | 2026-10-17T21:55:32.585Z | agents-and-memory |
| JS import count, source discarded io.github.sadri-dridi/js-import-count | 0 | Healthy | None | 31 | 328 ms | 2026-10-17T21:55:32.562Z | agents-and-memory |
| JSON byte count, body discarded io.github.sadri-dridi/json-bytes | 0 | Healthy | None | 31 | 326 ms | 2026-10-17T21:55:32.562Z | agents-and-memory |
| JSON Merge Patch key count, body discarded io.github.sadri-dridi/json-merge-ok | 0 | Healthy | None | 31 | 273 ms | 2026-10-17T21:55:32.562Z | agents-and-memory |
| JSON minify shape, body discarded io.github.sadri-dridi/json-min-ok | 0 | Healthy | None | 31 | 280 ms | 2026-10-17T21:55:32.562Z | agents-and-memory |
| Japanese era year band io.github.sadri-dridi/jpn-era | 0 | Healthy | None | 31 | 557 ms | 2026-10-17T21:55:32.533Z | agents-and-memory |
| JS escape sequence count, input discarded io.github.sadri-dridi/jsesc-ok | 0 | Healthy | None | 31 | 418 ms | 2026-10-17T21:55:32.518Z | agents-and-memory |
| JS unicode-escape count, input discarded io.github.sadri-dridi/jsesc-n | 0 | Healthy | None | 31 | 25 ms | 2026-10-17T21:55:32.384Z | agents-and-memory |
| JOSE compact-part count, value discarded io.github.sadri-dridi/jose-ok | 0 | Healthy | None | 31 | 366 ms | 2026-10-17T21:55:31.899Z | agents-and-memory |
| Joules to calories, number discarded io.github.sadri-dridi/joule-cal | 0 | Healthy | None | 31 | 364 ms | 2026-10-17T21:55:31.899Z | agents-and-memory |
| JATS article-id count, markup discarded io.github.sadri-dridi/jats-ok | 0 | Healthy | None | 31 | 389 ms | 2026-10-17T21:55:31.890Z | agents-and-memory |
| Jira Key Shape io.github.sadri-dridi/jira-key-shape | 0 | Healthy | None | 31 | 357 ms | 2026-10-17T21:55:31.890Z | productivity |
| journald cursor shape, value discarded io.github.sadri-dridi/journal-ok | 0 | Healthy | None | 31 | 355 ms | 2026-10-17T21:55:31.890Z | agents-and-memory |
| Julian Day integer band io.github.sadri-dridi/jd-ok | 0 | Healthy | None | 31 | 389 ms | 2026-10-17T21:55:31.887Z | agents-and-memory |
| Julian Day Number integer band io.github.sadri-dridi/jdn-ok | 0 | Healthy | None | 31 | 377 ms | 2026-10-17T21:55:31.884Z | agents-and-memory |
| Japanese era year band io.github.sadri-dridi/japanese-ok | 0 | Healthy | None | 31 | 413 ms | 2026-10-17T21:55:31.881Z | agents-and-memory |
| JDN modulo 7 weekday band io.github.sadri-dridi/jdn-mod | 0 | Healthy | None | 31 | 403 ms | 2026-10-17T21:55:31.880Z | agents-and-memory |
| ISO 8601 datetime shape io.github.sadri-dridi/iso8601-ok | 0 | Healthy | None | 31 | 400 ms | 2026-10-17T21:55:31.860Z | agents-and-memory |
| ISSN URN shape, value discarded io.github.sadri-dridi/issn-uri | 0 | Healthy | None | 31 | 384 ms | 2026-10-17T21:55:31.860Z | agents-and-memory |
| TICKET-123 issue key shape, value discarded io.github.sadri-dridi/issue-key-ok | 0 | Healthy | None | 31 | 380 ms | 2026-10-17T21:55:31.860Z | agents-and-memory |
| ISWC T- shape, value discarded io.github.sadri-dridi/iswc-ok | 0 | Healthy | None | 31 | 393 ms | 2026-10-17T21:55:31.860Z | agents-and-memory |
| ISSN shape, value discarded io.github.sadri-dridi/issn-shape | 0 | Healthy | None | 31 | 386 ms | 2026-10-17T21:55:31.858Z | agents-and-memory |
| ISRC 12-char shape, value discarded io.github.sadri-dridi/isrc-ok | 0 | Healthy | None | 31 | 36 ms | 2026-10-17T21:55:31.830Z | agents-and-memory |
| Whether current UTC year has 52 ISO weeks io.github.sadri-dridi/iso-week52 | 0 | Healthy | None | 31 | 70 ms | 2026-10-17T21:55:31.402Z | agents-and-memory |
| ISSN digit shape io.github.sadri-dridi/issn-ok | 0 | Healthy | None | 31 | 77 ms | 2026-10-17T21:55:31.399Z | agents-and-memory |
| ISO 4217 currency shape io.github.sadri-dridi/iso4217-ok | 0 | Healthy | None | 31 | 73 ms | 2026-10-17T21:55:31.394Z | agents-and-memory |
| ISO 3166-1 alpha-2 shape io.github.sadri-dridi/iso3166-ok | 0 | Healthy | None | 31 | 91 ms | 2026-10-17T21:55:31.389Z | agents-and-memory |
| UTC Thursday of the current ISO week io.github.sadri-dridi/iso-week-thu | 0 | Healthy | None | 31 | 152 ms | 2026-10-17T21:55:31.374Z | agents-and-memory |
| UTC ISO ordinal YYYY-DDD shape io.github.sadri-dridi/iso-ord2 | 0 | Healthy | None | 31 | 110 ms | 2026-10-17T21:55:31.354Z | agents-and-memory |
| ISO week 01-53 band io.github.sadri-dridi/iso-week-ok | 0 | Healthy | None | 31 | 67 ms | 2026-10-17T21:55:31.334Z | agents-and-memory |
| UTC ISO week-date io.github.sadri-dridi/iso-week-date | 0 | Healthy | None | 31 | 116 ms | 2026-10-17T21:55:31.327Z | agents-and-memory |
| ISO year-week YYYY-Www io.github.sadri-dridi/iso-yweek | 0 | Healthy | None | 31 | 106 ms | 2026-10-17T21:55:31.325Z | agents-and-memory |
| ISO-2022 ESC sequence count, input discarded io.github.sadri-dridi/iso2022-ok | 0 | Healthy | None | 31 | 106 ms | 2026-10-17T21:55:31.323Z | agents-and-memory |
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