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Runs in the cloud✓ vexa.ai
Numbers Online — phone intelligence
Overview
Description from the maker (original English)
Read-only phone intelligence for AI voice agents — line type, risk, DNC, signed receipts.
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi1 of 1 passedChecked from public information; code not scanned yet
- UsageiVery new★ –
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: Runs in the cloud
- Transport: Streamable HTTP
- Category: Chat & email
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 1 of 1 passed
- Runs on the maker’s server: what you ask it goes through their server.
- The registry lists no key to fill in.
You need
- Runs in the cloudNothing to install; it connects over the internet
Which app do you use?
Pick your app above. We remember it, so next time the button says “Install in …”.
Works in Claude on the web, desktop and mobile:
- Open Settings → Connectors
- Press Add custom connector
- Paste the address below and press Add
- If it asks you to sign in, sign in with the maker
https://numbers.online/api/v1/mcpRun this in your terminal
claude mcp add --transport http numbers-online https://numbers.online/api/v1/mcpOr copy the settings yourself
Paste into .cursor/mcp.json in your project, or ~/.cursor/mcp.json
{
"mcpServers": {
"numbers-online": {
"url": "https://numbers.online/api/v1/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
Or copy the settings yourself
Paste into .vscode/mcp.json in your project
{
"servers": {
"numbers-online": {
"type": "http",
"url": "https://numbers.online/api/v1/mcp"
}
}
}Your browser asks to open the app, then the app shows the settings and asks you to confirm. Key values are left empty for you to fill in.
ChatGPT connects only to servers on the internet:
- Open ChatGPT on the web → Settings → Connectors (Apps)
- Press Create or Add (some plans need Developer mode under Advanced first)
- Paste the address below, give it a name and save
- If it asks you to sign in, sign in with the maker
https://numbers.online/api/v1/mcpMenu names can differ slightly by plan and over time.
Your choice stays on this device in a cookie; no account needed.
These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.
What it can do
We have not read this server’s tool list yet; we check endpoints in rotation.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 9, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified against the domain numbers.online (the registry checks domain ownership)
- … Not checked yet
Still maintained
We have not read this repo from GitHub yet
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- … Not checked yet
Endpoint responds
Not checked yet; we check endpoints in rotation
- … Not checked yet
Sign-in with OAuth
Not checked yet; we check endpoints in rotation
- … Not checked yet
No hidden instructions in tool descriptions
Not checked yet; we read the tool list when we check the endpoint
Compared with others in Chat & emaili
- More stars than 0% of the other 1869 servers in this category
- Published to the registry more recently than 13% of the other 1869 servers in this category
- Basic checks equal to or better than 100% of the other 1869 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Numbers Online — phone intelligence safe?
It passed 1 of 1 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs in the maker’s cloud. Connect over the internet with nothing to install, but what you send passes through the maker’s servers.
Is it still maintained?
The GitHub repo last changed –, and the latest version (1.0.0) reached the registry 5 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. It connects by URL, so apps that accept remote MCP servers work too, such as ChatGPT in developer mode.
What can I use instead?
In the same category: Vexa, emailmd, MCP WhatsApp Cloud
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
emailmd
Render markdown into email-safe HTML, lint drafts for deliverability problems, and preview emails.
Computer or cloud✓ emailmd.dev
MCP WhatsApp Cloud
MCP server for WhatsApp Cloud API (Meta) — messages, media, and templates via Graph API
Runs on your computer
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Numbers Online — phone-intelligence MCP server
A hosted, read-only Model Context Protocol server that gives an AI voice agent phone intelligence in a single call: *who is this inbound caller, and is this outbound number one to think twice about dialing* — before it burns agent minutes.
- Endpoint:
POST https://numbers.online/api/v1/mcp(Streamable HTTP, JSON-RPC 2.0) - Transport: remote / hosted — nothing to install or run. Point your agent at the URL.
- Auth:
Authorization: Bearerfor tool calls; discovery is public. - Docs: https://numbers.online/docs/integrations · Site: https://numbers.online
Positioning. Every output is an advisory, low-confidence supplementary signal.
The calling agent keeps every routing and dialing decision and remains responsible for
compliance. Nothing here asserts that a call is lawful, unlawful, "safe", or "spam".
Tools
Four read-only tools (all annotated readOnlyHint, idempotentHint). Discover them live with tools/list (no auth required).
| Tool | Returns | Billed |
|---|---|---|
phone_lookup | Full bundle — validity, formatting, line type, range carrier, country, caller name (CNAM where available), STIR/SHAKEN verstat, a labeled spam signal, first-party DNC signal, signed receipt | bundled per-call |
caller_risk | Spam signal + verstat + first-party DNC signal + receipt (no name dip) | bundled per-call |
line_type | Deterministic only — validity, line type (mobile / fixed line / VoIP / …), carrier, country, formatting | free |
dnc_check | First-party do-not-contact signal + signed receipt | free |
About the DNC signal
The DNC signal is first-party, consent-first: it reflects a do-not-contact preference registered and verified by the number's own owner inside Numbers Online. It is not a copy, mirror, or replica of any government or licensed do-not-call registry. The values:
- `SUPPRESS` — the owner registered a do-not-contact preference for this channel.
- `NO_MATCH` — no suppression preference on record (absence of suppression is not consent).
- `UNKNOWN` — the number couldn't be evaluated.
Treat it as a supplementary input to your own TCPA process, never a verdict that a call is lawful. (Reassigned-number status is inherently a carrier/FCC dataset and is intentionally not offered as a first-party signal — there's no reassigned_check tool.)
Connect
Any MCP client (Claude Desktop, Claude Code, IDEs)
Add a remote server pointing at the endpoint. Example mcp.json fragment:
{"mcpServers": { "numbers-online": { "type": "streamable-http", "url": "https://numbers.online/api/v1/mcp", "headers": { "Authorization": "Bearer YOUR_API_KEY" } } } }
A key needs the mcp use case. initialize, ping, and tools/list work without auth (capability discovery); tools/call is fail-closed and requires the key.
Vapi
Register Numbers Online as an MCP tool — the transport literal is `shttp` (see integrations/mcp/vapi-mcp-tool.json). A Vapi custom-function-tool alternative lives at integrations/vapi/numbers-online-tool.json.
Retell
Point your agent's call_inbound webhook at the drop-in config in integrations/retell/inbound-webhook.json. It always returns HTTP 200 within Retell's budget (fail-open) so a slow lookup never keeps the caller ringing.
Full walkthrough: docs/ai-voice-agents.md.
Quick smoke test
# discover tools (no auth)curl -s https://numbers.online/api/v1/mcp \ -H 'content-type: application/json' \ -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}'
call a tool (needs an mcp-scoped key)
curl -s https://numbers.online/api/v1/mcp \ -H "Authorization: Bearer $KEY" -H 'content-type: application/json' \ -d '{"jsonrpc":"2.0","id":2,"method":"tools/call","params":{"name":"phone_lookup","arguments":{"number":"+14155552671"}}}'
Runnable reference clients (zero-dependency) are in examples/ — Node and Python.
Signed receipts (verifiable "checked as of T" evidence)
Every billable answer can carry a receipt_id and an Ed25519 response_signature. Fetch the receipt later — no API key required, the id is the capability:
GET https://numbers.online/api/v1/receipts/{id}No raw phone number is stored — only number_hash = sha256(E.164). Verify with the public key at GET https://numbers.online/api/v1/publickey. A receipt is verifiable evidence that a status was *checked at a point in time* — not proof that dialing was lawful. Treat a receipt id as sensitive (a phone number is a small keyspace, so the hash is bindable to a candidate number).
Privacy
Raw phone numbers are never logged or stored; they are hashed (sha256). The MCP path is read-only and stateless. Privacy policy: https://numbers.online/privacy
Pricing
The full bundle is metered as one bundled per-call dip (validation + line type + risk + first-party DNC in a single call). line_type and dnc_check are free. See https://numbers.online for current rates.
Developer: Evergrow · Product: Numbers Online · Contact: contact@numbers.online · License: MIT