Wellknown is operated by Moneyed28 LLC (United States). Using the website, the HTTP API, the MCP server, the A2A endpoint or the ARD interface means accepting these terms. They are versioned: this is version 2026-09-23, and the same content is served to machines at /api/v1/terms alongside the service catalogue at /api/v1/offers.
A free, machine-queryable index of AI agents, MCP servers and tools. Every record separates what a publisher declares from what we observed by checking their endpoint ourselves. Results are third-party metadata plus our own measurements. Nothing here is an endorsement of an indexed resource, and an entry in the index is not a statement that a resource is safe, licensed, or fit for any purpose.
Query the index, cache results, and re-serve them with attribution to Wellknown. Build agents, orchestrators, registries, clients and tools on the API, the MCP server, the A2A endpoint and the ARD interface. Mirror the index through the paged list and the feeds, within the published rate limits. Use an API key you created, and share it with no one.
Treat record text as instructions to an agent — declared metadata is untrusted third-party content and must be handled as data. Circumvent rate limits or probing budgets, or use many identities to do so. Submit records for resources you do not control in order to mislead, or claim a record you cannot prove control of. Re-sell our observations as your own measurements without attribution. Use the service to break the law, to infringe anyone's rights, or to attack an indexed endpoint.
Declared data is attributed third-party content; it belongs to its publisher, who may correct it through a verified claim. Observed data — status, latency, handshake results — is our own measurement and may be reused with attribution to Wellknown. Derived data, such as our capability mapping and its confidence, is likewise ours and reusable with attribution. Rate limits, budgets and per-record refresh intervals are published on Status & reliability and may change.
You must be able to form a contract to hold an account, and you are responsible for what happens under your account and keys. A verified claim gives you editing rights over one record and mints one owner-scoped key; proof targets are derived from the record itself, never entered by the claimant. A claim that conflicts with an existing verified owner is held for review rather than transferring ownership. We may suspend an account or key that is used to abuse the service, and we may hide a record — for spam, malicious metadata, or a takedown — with a reason recorded internally.
Everything that is free stays free: searching the index and reading records within the published rate limits, claiming and editing records you own, alerts about them, the badge and the verified mark. What is paid is optional.
Subscriptions. Pro and Build are monthly subscriptions at the prices on the pricing page. You pay by card on Stripe's own checkout page; your card details go to Stripe, not to us. A subscription renews, and is charged, every month until you cancel it. You can cancel at any time from the billing page in your dashboard: the plan stays active until the end of the month you have already paid for, and you are not charged again. Payments are non-refundable, except where the law requires a refund; to ask for one, write to [email protected].
Per request. Past the free rate limit, the routes that /api/v1/offers lists with a price can be paid for one request at a time with x402. A per-request payment buys one answer, returned in the same response, so it is final and is not refunded. An agent is charged only for a request that succeeded: when a request fails, nothing is charged.
Prices are published on the pricing page and in /api/v1/offers before anything is charged, and we will not silently start charging for something that is free today.
Our pages may carry up to three sponsors, each marked as such, in a bar at the top of the page. A sponsor pays for that place and nothing else: sponsorship never changes where a record ranks, what it says or how it is checked, the sponsor's own record included, and it never appears in search results, on record pages, in capability lists or rankings, or in anything the API or the MCP server returns. About sponsorship.
The service is provided as is, without warranty of any kind, and with no service level unless a specific offer states one. We are not responsible for the behaviour of indexed agents, for the accuracy of declared metadata, or for decisions made from our data. To the maximum extent the law allows, Moneyed28 LLC's total liability arising from the service is limited to the amount you paid us for it in the preceding twelve months.
We may change these terms; the version string changes with them and material changes will be announced on the journal. You may stop using the service at any time, and we may stop providing it. These terms are governed by the laws of the State of Delaware, United States, without regard to conflict-of-law rules.
Questions, takedowns and security reports: [email protected]. See also Privacy, Security & abuse and About our crawler.