4ai – premium .ai domains for sale
REMOTE · 4AI.AI
Search 254 premium .ai domains for sale, get free .ai value estimates and real .ai sales data.
Available components
Last scanned (6 hours ago)
Scores higher than 60% of remote servers
Reachable. Last reached 5 Nov 2026.
Category E-commerce
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security74
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- HSTS check failed: the Strict-Transport-Security header is absent. See how to fix → View diagnostics → Fail
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability76
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 1006 tokens (~100/item across 10 items; 10 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management13
- Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 10 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 11 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 7 to 10. That category is still filling its 30-day observation window: 2 days of observed history at the previous scan, 3 at this one. The score rises as the window fills, whether or not the server changes.
- 2 Nov 26 +1
- The server rewrote its instructions, which are the text every model session reads security
- Schema quality: 502 → 1006 ▼ functional
- Stability: unverified → 0.03 ▲ functional
- Server version: 1.0.0 → 1.1.0 functional
- New tool “compare_domains” functional
- New tool “get_offer_link” functional
- New tool “how_buying_works” functional
- New tool “similar_domains” functional
- New tool “suggest_domains” functional
- 1 Nov 26 71
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://4ai.ai/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=4ai.ai | CN=WE1,O=Google Trust Services,C=US | 3 Oct 2026 | 1 Jan 2027 | ECDSA 256 | ECDSA-SHA256 | b504955f28c0aa8f13197f040ee35ab2 |
| SANs: 4ai.ai | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of 4ai.ai. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| ai. | present | 1814, 3799 | 8, 8 | Verified |
| 4ai.ai. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://4ai.ai/mcp | Verified | 200 | |
| http (plaintext) | http://4ai.ai/mcp | HTTPS enforced | 301 | https://4ai.ai/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
ai_domain_sales Publicly reported .ai domain sales ~70
The biggest publicly reported .ai domain sales (price in USD, date, venue, source). Useful to estimate what a .ai domain is worth.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Number of sales (default 20) |
| max_length | integer | – | Only names up to this length without .ai |
No output schema declared.
No examples provided.
compare_domains Compare .ai domains ~67
Compare 2 to 5 .ai domain names side by side: length, type, words, whether 4ai sells it, estimated value ranges and a short verdict.
| Name | Type | Req | Description |
|---|---|---|---|
| domains | array | yes | Domain names, e.g. ["quantumchip.ai", "aiquantum.ai"] |
No output schema declared.
No examples provided.
estimate_domain_value Estimate the value of a .ai domain (free) ~86
Free value estimate for any .ai domain name: auction, marketplace and brokerage values with likely ranges, the type of name, a short verdict and notes. Also says if the name is for sale on 4ai, with an offer link. Up to 100 names per call.
| Name | Type | Req | Description |
|---|---|---|---|
| domains | array | yes | Domain names, e.g. ["agent.ai", "888.ai"] |
No output schema declared.
No examples provided.
get_domain Get a .ai domain ~66
Details for one domain in the 4ai portfolio (for example "p0.ai"): categories, page, offer link, and comparable public .ai sales. Says so if the domain is not in the portfolio.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain name, with or without .ai |
No output schema declared.
No examples provided.
get_offer_link Get an offer link ~127
A link to the offer form for a 4ai domain with the amount (and an optional note) filled in. Nothing is sent: the user opens the link, checks the offer and sends it. Minimum offer $3,000.
| Name | Type | Req | Description |
|---|---|---|---|
| amount_usd | integer | – | Offer in USD (minimum 3000). Optional. |
| domain | string | yes | Domain in the 4ai portfolio, e.g. "quantumchip.ai" |
| note | string | – | Short message to the seller, e.g. what the domain is for. Optional, max 300 characters. |
No output schema declared.
No examples provided.
how_buying_works How buying a domain from 4ai works ~53
The steps, payment (Escrow.com), fees, minimum offer and transfer time for buying a .ai domain from 4ai. Use it when the user asks whether buying is safe or how it works.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
list_categories List categories ~33
Categories of .ai domains in the 4ai portfolio, with what they are good for and how many names each has.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
search_domains Search .ai domains for sale ~166
Search the 4ai.ai portfolio of premium .ai domain names for sale. Filter by a word in the name, a category (see list_categories), type and maximum length. Every result has an offer link.
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | Category key, e.g. short, numeric, quantum, crypto, tech, ai, code, space, health, gaming, commerce, places, brands |
| limit | integer | – | Maximum number of results (default 20, max 100) |
| max_length | integer | – | Maximum length of the name without .ai |
| query | string | – | Word to look for in the domain name or a category word, e.g. "quantum", "casino", "health" |
| type | string | – | Kind of name |
No output schema declared.
No examples provided.
similar_domains Similar .ai domains ~77
Alternatives to a .ai domain: give any name (taken, too expensive, or one the user already likes) and get the closest .ai domains that are for sale on 4ai.
| Name | Type | Req | Description |
|---|---|---|---|
| domain | string | yes | Domain name, with or without .ai |
| limit | integer | – | Maximum number of results (default 8) |
No output schema declared.
No examples provided.
suggest_domains Suggest .ai domains for a project ~136
Describe a company, product or idea in plain words (e.g. "telehealth app for mental health", "crypto casino", "quantum chip startup") and get the best-fitting .ai domains from the 4ai portfolio, ranked, each with the reason it fits and an offer link. Use this when the user asks for a .ai name for something.
| Name | Type | Req | Description |
|---|---|---|---|
| description | string | yes | What the project, company or product does, in any words |
| limit | integer | – | Maximum number of results (default 10, max 50) |
| max_length | integer | – | Maximum length of the name without .ai |
No output schema declared.
No examples provided.
How do I install the 4ai – premium .ai domains for sale MCP server?
4ai – premium .ai domains for sale is a hosted endpoint at https://4ai.ai/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · 4ai.ai
claude mcp add --transport http ai-4ai-domains 'https://4ai.ai/mcp'
What is the 4ai – premium .ai domains for sale MCP server?
4ai – premium .ai domains for sale is an MCP server listed in the public MCP registry as ai.4ai/domains. Search 254 premium .ai domains for sale, get free .ai value estimates and real .ai sales data. This page covers its hosted endpoint (https://4ai.ai/mcp).
Is the 4ai – premium .ai domains for sale MCP server safe to use?
4ai – premium .ai domains for sale scores 73 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the 4ai – premium .ai domains for sale MCP server expose?
4ai – premium .ai domains for sale exposes 10 tools: search_domains, get_domain, list_categories, estimate_domain_value, suggest_domains, and 5 more. Their descriptions and schemas cost roughly 881 tokens of context every time the server is loaded.
Does the 4ai – premium .ai domains for sale MCP server require authentication?
No. We connected to 4ai – premium .ai domains for sale without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the 4ai – premium .ai domains for sale MCP server still maintained?
4ai – premium .ai domains for sale is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.