Developer Tools · Social Networking
Fediverse Actor
Check
Resolve a @user@host handle through WebFinger to its ActivityPub actor and check the negotiated discovery chain in chat
Fediverse Actor Check runs the same live engine here and in your assistant
Live playground
Use Fediverse Actor Check now
Drop in any public fediverse handle or actor URL and watch the live WebFinger-to-actor discovery chain get verified hop by hop.
Your usage
—
Free forever — create a free account for a bigger monthly allowance that follows you across every app and every assistant.Pooled across every app and surface. Manage usage
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Marketplaces
Open Fediverse Actor Check where you already work — every listing runs the same live engine as this page.
- Marketplace listings are on the way. Meanwhile, point any MCP-compatible assistant straight at the live endpoint:
https://powmcp.com/fediverse-actor-check/mcp
Proof
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Engine Anatomy
Proof
Fediverse Actor Check
What it does
Resolve a @user@host handle through WebFinger to its ActivityPub actor and check the negotiated discovery chain in chat
Validate a public fediverse handle (@user@host or acct:) or ActivityPub actor URL end to end: resolve /.well-known/webfinger, follow rel="self" to the actor document fetched with the required Accept: application/activity+json header, then check WebFinger-to-actor consistency (subject/aliases vs id, type/id self-link round-trip, preferredUsername vs handle) and the presence, format, and HTTP reachability of inbox, outbox, sharedInbox, publicKey, and endpoints — or compare two same-lineage actors under identical limits.
Tools in this application
Actor Check
actor_check
actor_check
Actor Compare
actor_compare
actor_compare
0USD
Free to use with fair-use rate limits.
Fediverse Actor Check questions
Scope and boundaries for Fediverse Actor Check.
01What does Fediverse Actor Check actually check?
Validate a public fediverse handle (@user@host or acct:) or ActivityPub actor URL end to end: resolve /.well-known/webfinger, follow rel="self" to the actor document fetched with the required Accept: application/activity+json header, then check WebFinger-to-actor consistency (subject/aliases vs id, type/id self-link round-trip, preferredUsername vs handle) and the presence, format, and HTTP reachability of inbox, outbox, sharedInbox, publicKey, and endpoints — or compare two same-lineage actors under identical limits.
02What does it never do?
It reports what its pinned engine measured and nothing more — it does not judge quality, correctness of your underlying business decisions, or anything outside its stated scope, and it never fabricates a result.
03What does it cost?
Nothing. Every published app is free to use with fair-use rate limits.
04Can my assistant connect directly?
Yes — any MCP-compatible assistant can connect straight to the canonical endpoint: https://powmcp.com/fediverse-actor-check/mcp. Marketplace listings are conveniences over the same live engine.