Official MCP RegistryDeparted
paidfor
Check an x402 seller before paying: verdict, failure rate and evidence from paid calls on Base.
First seen 29 Oct 2026. Evidence as of 30 Oct 2026. Left its listing 30 Oct 2026.
4
Tools
From an anonymous probe
1
Source listings
Each with its own history
15
Recorded changes
Since first seen
Tools
| Tool | Description | Behaviour |
|---|---|---|
| check_x402_seller | Call this before any x402 payment, before retrying a request that answered HTTP 402, or whenever the user is about to buy an API call with USDC on Base or names an API they intend to pay per call. Returns a verdict (avoid, caution, ok, unknown), one sentence to act on, the seller's paid-call count and failure rate with a 95% interval, listed price, modal quote and max overcharge ratio when known, and links to the seller page and raw evidence. | Read-only |
| list_reliable_sellers | Call this when choosing among sellers for a task, or when the user asks for a safe or reliable API. Returns sellers with zero failures across at least 30 paid calls, most-called first. For each: domain, category, paid-call count, the 95% upper bound on its failure rate, median quoted price in USDC, USDC paid to it in the last 30 days, when it was last seen, and its paidfor seller page. | Read-only |
| recent_changes | Call this when the user asks what changed, or before relying on a verdict older than a day. Returns recent changes, newest first: verdict changes, new failures by type, moved quotes, changed pay-to addresses, sellers added or reaching 30 paid calls, published seller replies, the operator-reported series maturing or disagreeing with ours. Each change has its time, type, seller domain, seller page and type-specific details (for example the old and new quote). | Read-only |
| report_x402_payment | After your agent pays an x402 seller with any wallet, report what came back. Needs the resource URL, the settlement transaction hash and the outcome. Free, no account, no key; the report counts only with on-chain proof. | Changes data |
Change history
- Left the listing (registry)
- Registry status changed from "active" to "deleted" (registry)
- report_x402_payment: tool added
- recent_changes: input schema changed
- recent_changes: description changed (+"changed," +"ours. Each change has its time, type, seller domain, seller page and type-specific details (for example the old" +"new quote).")
- recent_changes: annotations changed
- list_reliable_sellers: title changed
- list_reliable_sellers: input schema changed
- list_reliable_sellers: description changed (+"among sellers" +"first. For each: domain, category, paid-call count, the 95% upper bound on its failure rate, median quoted price in USDC, USDC paid to it in the last 30 days, when it was last seen, and its paidfor seller page." -"which x402 seller to use")
- list_reliable_sellers: annotations changed
- check_x402_seller: input schema changed
- check_x402_seller: description changed (+"payment," +"answered HTTP" +"whenever")
- check_x402_seller: annotations changed
- server instructions changed (+"check_x402_seller returns a verdict for an x402 resource URL or seller domain, useful before an" +"payment or" +"402: "avoid" means")
- Listed (registry)
| Source | Listing | First seen | Last seen | Versions |
|---|---|---|---|---|
| Official MCP Registry Departed 30 Oct 2026 | io.github.sarmadahsan/paidfor | 29 Oct 2026 | 30 Oct 2026 | 2 |