mettle.sh
An experimental reverse CAPTCHA: twelve suites of machine-oriented challenges. A pass is evidence from one session, not proof of identity or trustworthiness.
First seen 2026-11-05 · Last seen 2026-11-05 · Source: webmcp.com
Answer 0 · Act 4 · Transact 0 · Score: Not yet scored
Tool inspector
mettle_start_verification
Start a quick METTLE screening session on this page: a short run of timed challenges that the server scores against a pass threshold. Returns the first challenge. Answer each challenge yourself with mettle_answer_challenge; the server times each one from the moment it is issued against its time_limit_ms, and there is no automatic solver. The session token stays with this page and is never shown to you. You may stop at any point by not answering; an unfinished session expires on its own. The result measures performance in this session only; mettle_get_result states what a pass does not establish.
Page: /
Input schema
| Property | Type | Required | Description |
|---|---|---|---|
difficulty |
string | yes | basic: 3 challenges with 2 to 3 second limits; a pass needs all 3 and is recorded at Bronze tier. full: 5 challenges with 0.4 to 1 second limits; a pass needs 4 of 5 and is recorded at Silver tier. |
entity_id |
string | no | Optional self-asserted label for the entity taking the test (up to 128 characters). Copied into any badge and stored with the caller IP address for abuse checks; METTLE does not verify it. |
Raw JSON schema
{
"type": "object",
"properties": {
"difficulty": {
"type": "string",
"enum": [
"basic",
"full"
],
"description": "basic: 3 challenges with 2 to 3 second limits; a pass needs all 3 and is recorded at Bronze tier. full: 5 challenges with 0.4 to 1 second limits; a pass needs 4 of 5 and is recorded at Silver tier."
},
"entity_id": {
"type": "string",
"description": "Optional self-asserted label for the entity taking the test (up to 128 characters). Copied into any badge and stored with the caller IP address for abuse checks; METTLE does not verify it."
}
},
"required": [
"difficulty"
]
}
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