# Abstract API MCP by usefulapi (remote · abstract-api.usefulapi.io)

Validate emails, phones, IBAN, VAT; look up IPs and companies; rates, holidays, time via Abstract.

- Trust score: 65/100 (medium)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-18

## Components

- remote · `abstract-api.usefulapi.io`: 65/100 (this document), [markdown](https://verifymcp.io/servers/io-usefulapi-abstract-api/abstract-api.md), [page](https://verifymcp.io/servers/io-usefulapi-abstract-api/abstract-api)

## Channel facts

- Endpoint: `https://abstract-api.usefulapi.io/mcp`
- Transports: `streamable-http`
- Auth: `required`
- Version: `1.0.0`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-18.

- **Endpoint Security**: 78/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS enforcement could not be verified: the plaintext port redirected somewhere other than https, so enforcement is unproven.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 0/100
  - Transport check failed: declared streamable-http, but the endpoint redirected instead of responding directly.
- **Schema Quality & AI Usability**: 83/100
  - 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1866 tokens (~133/item across 14 items; 14 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 20/100
  - Stability observed for 6 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 14 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the Abstract API MCP by usefulapi server?

Abstract API MCP by usefulapi is a hosted endpoint at https://abstract-api.usefulapi.io/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.

### Claude

```bash
claude mcp add --transport http io-usefulapi-abstract-api 'https://abstract-api.usefulapi.io/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "io-usefulapi-abstract-api": {
      "url": "https://abstract-api.usefulapi.io/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "io-usefulapi-abstract-api": {
      "type": "http",
      "url": "https://abstract-api.usefulapi.io/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.io-usefulapi-abstract-api]
url = "https://abstract-api.usefulapi.io/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "io-usefulapi-abstract-api": {
      "type": "remote",
      "url": "https://abstract-api.usefulapi.io/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add io-usefulapi-abstract-api --url 'https://abstract-api.usefulapi.io/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  io-usefulapi-abstract-api:
    url: "https://abstract-api.usefulapi.io/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "io-usefulapi-abstract-api": {
      "Transport": "http",
      "Url": "https://abstract-api.usefulapi.io/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add io-usefulapi-abstract-api -t streamable-http -u 'https://abstract-api.usefulapi.io/mcp'
```

### Other

```json
{
  "mcpServers": {
    "io-usefulapi-abstract-api": {
      "type": "http",
      "url": "https://abstract-api.usefulapi.io/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-17 (score 65, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-14 (score 64, +3)

- [security] The server rewrote its instructions, which are the text every model session reads
- [functional] The server now declares the “prompts” capability
- [functional] First check of Schema quality: 100
- [functional] New prompt “getting_started”
- [functional] Server version: 1.0.0 → 1.1.0

### 2026-10-13 (score 61, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-10-12 (score 61)

First indexed and scored.

## MCP tools (14)

### `abstractapi_validate_email` (~93 tokens)

Validate email

Check one email address: deliverability (format, MX, SMTP), quality score, free/disposable/role/catch-all flags, sender details and known data breaches. Email Reputation API. Spends 1 credit of your Email Reputation plan per request (a failed request counts too); needs the Email Reputation API key.

Input parameters:

- `email` (string, required): The email address to check, e.g. jane@example.com.

### `abstractapi_lookup_phone` (~121 tokens)

Look up phone number

Validate and enrich one phone number: format, carrier, line type (mobile, landline, VoIP), location, line status, risk and known breaches. Phone Intelligence API. Spends 1 credit of your Phone Intelligence plan per request (a failed request counts too); needs the Phone Intelligence API key.

Input parameters:

- `country` (string): Two-letter country code of the number, only needed when the number has no international prefix.
- `phone` (string, required): The phone number, ideally with the international prefix, e.g. +14155550100.

### `abstractapi_lookup_ip` (~160 tokens)

Look up IP address

Geolocation and security intelligence for one IPv4 or IPv6 address: VPN/proxy/Tor/hosting/abuse flags, ASN, company, location, timezone, flag and currency. IP Intelligence API. An explicit ip_address is required (without one Abstract would look up the caller's own address, which here is this server's). Spends 1 credit of your IP Intelligence plan per request (a failed request counts too); needs the IP Intelligence API key.

Input parameters:

- `fields` (string): Only these top-level sections, e.g. location,security (security, asn, company, domains, location, timezone, flag, currency).
- `ip_address` (string, required): The IPv4 or IPv6 address to look up. Required.

### `abstractapi_enrich_company` (~130 tokens)

Enrich company

Firmographic data for a company web domain: name, description, logo, address, industry (SIC/NAICS), employee and revenue ranges, contacts, social profiles, technologies. Company Enrichment API. Spends 1 credit of your Company Enrichment plan per request (a failed request counts too); needs the Company Enrichment API key.

Input parameters:

- `domain` (string, required): The company's domain, e.g. airbnb.com (a pasted URL is reduced to its domain).
- `fields` (string): Only these top-level keys, e.g. company_name,industry,employee_range.

### `abstractapi_validate_iban` (~81 tokens)

Validate IBAN

Check the structure and check digits of one International Bank Account Number. It does not prove that the account exists. IBAN Validation API. Spends 1 credit of your IBAN Validation plan per request (a failed request counts too); needs the IBAN Validation API key.

Input parameters:

- `iban` (string, required): The IBAN, with or without spaces.

### `abstractapi_validate_vat` (~88 tokens)

Validate VAT number

Check whether a VAT number is valid and, if it is, return the registered company name and address. VAT Validation API. Spends 1 credit of your VAT Validation plan per request (a failed request counts too); needs the VAT Validation API key.

Input parameters:

- `vat_number` (string, required): The VAT number including the two-letter country prefix, e.g. SE556656688001.

### `abstractapi_calculate_vat` (~167 tokens)

Calculate VAT

Work out the VAT-compliant price for an amount in a country: the amounts without and with VAT, the VAT amount and the rate. Set is_vat_incl to true for the reverse calculation (the amount already contains VAT). VAT Validation API. Spends 1 credit of your VAT Validation plan per request (a failed request counts too); needs the VAT Validation API key.

Input parameters:

- `amount` (number, required): The amount to calculate from.
- `country_code` (string, required): Two-letter country code of the transaction, e.g. DE.
- `is_vat_incl` (boolean): True if the amount already includes VAT (default false).
- `vat_category` (string): A reduced-rate category from abstractapi_list_vat_rates (default: the standard rate).

### `abstractapi_list_vat_rates` (~79 tokens)

List VAT rates

The latest VAT rates of one country: the standard rate and each reduced-rate category with its description. VAT Validation API. Abstract answers this endpoint without checking the key and may not count it as a credit; this tool still needs the VAT API key.

Input parameters:

- `country_code` (string, required): Two-letter country code, e.g. DE.

### `abstractapi_get_exchange_rates` (~112 tokens)

Get exchange rates

Latest foreign-exchange and cryptocurrency rates for a base currency against one or more targets (all supported currencies if none is given). Exchange Rates API. Spends 1 credit of your Exchange Rates plan per request (a failed request counts too); needs the Exchange Rates API key.

Input parameters:

- `base` (string, required): Base currency, ISO 4217 code, e.g. USD.
- `target` (string): Target currencies separated by commas, e.g. EUR,GBP,JPY. Omit for all.

### `abstractapi_convert_currency` (~137 tokens)

Convert currency

Convert an amount from a base currency to one target currency, at the latest rate or at the rate of a past date. Exchange Rates API. Spends 1 credit of your Exchange Rates plan per request (a failed request counts too); needs the Exchange Rates API key.

Input parameters:

- `base` (string, required): Currency to convert from, e.g. USD.
- `base_amount` (number): Amount of the base currency (default 1).
- `date` (string): A past date, yyyy-mm-dd (default: the latest rate).
- `target` (string, required): Currency to convert to, e.g. EUR (one currency).

### `abstractapi_get_historical_rates` (~123 tokens)

Get historical exchange rates

Exchange rates of a base currency on a past date. Abstract lists this endpoint as closed beta: a key may be refused (HTTP 401/403) until Abstract enables it. Exchange Rates API. Spends 1 credit of your Exchange Rates plan per request (a failed request counts too); needs the Exchange Rates API key.

Input parameters:

- `base` (string, required): Base currency, e.g. USD.
- `date` (string, required): The past date, yyyy-mm-dd.
- `target` (string): Target currencies separated by commas. Omit for all.

### `abstractapi_get_holidays` (~142 tokens)

Get public holidays

Public, local and religious holidays of a country for a date, a month or a year. Free Abstract plans require year, month and day together; paid plans default missing values to today. Public Holidays API. Spends 1 credit of your Public Holidays plan per request (a failed request counts too); needs the Public Holidays API key.

Input parameters:

- `country` (string, required): Two-letter country code, e.g. SG.
- `day` (integer): Day of the month 1-31 (needs month and year).
- `month` (integer): Month 1-12.
- `year` (integer): Year, e.g. 2026.

### `abstractapi_get_current_time` (~97 tokens)

Get current time

The current local date, time and timezone (name, abbreviation, GMT offset, daylight saving) of a place, coordinates or IP address. Timezone API. Spends 1 credit of your Timezone plan per request (a failed request counts too); needs the Timezone API key.

Input parameters:

- `location` (string, required): A place name (e.g. Oxford, United Kingdom), latitude,longitude coordinates, or an IP address.

### `abstractapi_convert_time` (~123 tokens)

Convert time between locations

Convert a date and time from one location to another (places, coordinates or IP addresses). Without base_datetime the current time is converted. Timezone API. Spends 1 credit of your Timezone plan per request (a failed request counts too); needs the Timezone API key.

Input parameters:

- `base_datetime` (string): The time to convert, yyyy-mm-dd hh:mm:ss in the base location (default: now).
- `base_location` (string, required): The location the time belongs to.
- `target_location` (string, required): The location to convert the time into.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/io-usefulapi-abstract-api/abstract-api#diagnostics

## Score history

- 2026-10-18: 65
- 2026-10-17: 65
- 2026-10-16: 64
- 2026-10-15: 64
- 2026-10-14: 64
- 2026-10-13: 61
- 2026-10-12: 61

## Common questions

### What is the Abstract API MCP by usefulapi server?

Abstract API MCP by usefulapi is listed in the public MCP registry as io.usefulapi/abstract-api. Validate emails, phones, IBAN, VAT; look up IPs and companies; rates, holidays, time via Abstract. This page covers its hosted endpoint (https://abstract-api.usefulapi.io/mcp).

### Is the Abstract API MCP by usefulapi server safe to use?

Abstract API MCP by usefulapi scores 65 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 Abstract API MCP by usefulapi server expose?

Abstract API MCP by usefulapi exposes 14 tools: abstractapi_validate_email, abstractapi_lookup_phone, abstractapi_lookup_ip, abstractapi_enrich_company, abstractapi_validate_iban, and 9 more. Their descriptions and schemas cost roughly 1,653 tokens of context every time the server is loaded.

### Does the Abstract API MCP by usefulapi server require authentication?

Yes. Abstract API MCP by usefulapi asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the Abstract API MCP by usefulapi server still maintained?

Abstract API MCP by usefulapi is still listed as active in the MCP registry. We last reached this channel on 18 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://abstract-api.usefulapi.io/mcp
- Repository: https://github.com/m190/usefulapi-mcp
- Website: https://usefulapi.io/abstract-api/
- Changelog RSS feed: https://verifymcp.io/servers/io-usefulapi-abstract-api/abstract-api.xml
- Changelog JSON feed: https://verifymcp.io/servers/io-usefulapi-abstract-api/abstract-api.json
- HTML version of this page: https://verifymcp.io/servers/io-usefulapi-abstract-api/abstract-api