letme vs One

letme

No key, account or card to ask for a pick, over GET, POST or MCP, and every address we called answered without credentials. Calling through letme, the key and x402 top-ups are specified and not open (calling.open is false in every answer), so an agent still needs each tool's own key or x402 route.

One

One's remote MCP server has three tools, OAuth 2.1 sign-in with PKCE and a consent screen that sets read only, read and write, full or per-action access for each connection. A person must sign in through a browser, the SOC 2 audit is unfinished, and the site's changelog stops at 13 July 2026.

letme

1. Call the pick direct with its endpoint and connect snippet. letme.dev doesn't call tools yet, and calling.open says when that changes
2. Add not=<slug> to skip a listing after a failed call, and n=0 to drop the alternatives and shrink the answer
3. Check understood.confidence on a job in words, and ask again with a capability id (letme.dev/web.search) when it's low
4. Don't ask for ungraded listings by slug. letme.dev/letme and letme.dev/localghost answer 404
5. Send keys in a header, not in the URL, even where an answer's endpoint shows ?tavilyApiKey=<key>

One

1. Call list_one_integrations first and read each connection's access field. When the policy is actions, run those ids directly without calling find_one_actions
2. Send every operation a task needs in one find_one_actions call, up to 10 requests, each a platform and a short intent with no IDs, names or message text
3. When a document comes back as a digest, call find_one_actions again with load and a section name. Don't guess parameters the digest left out
4. After a timeout on execute_one_action, check whether the write took effect before sending it again. No idempotency key is documented
5. A 403 for a call outside the grant won't succeed on retry. Ask the user to widen the grant in the dashboard or reconnect