44api VAT Validation API
68
AI ReadinessAI-Aware (B+)68/100
Official vendor OpenAPI document · agent-readyData EnrichmentCompany DataapiKey3 EndpointsREST
For Agents
Validate VAT and tax ID numbers across 54+ countries and return the company name, address, and registration status for each. Covers all 27 EU states via the VIES network plus 27 or more non-EU countries.
Use for: Validate a VAT number for a German company, Check whether a VAT ID is registered and active, Look up the company name and address behind a VAT number, Verify a supplier tax ID before raising an invoice
Not supported: Does not handle tax calculation, VAT filing, or invoicing. Use for VAT number validation and company data lookup only.
The 44api VAT Validation API checks VAT and tax ID numbers across 54+ countries and returns the registered company name, address, and registration status for each number. It covers all 27 EU member states through the official VIES network plus 27 or more non-EU countries, giving one consistent response shape regardless of the country checked. The API also manages an IP whitelist that controls which addresses may call your account.
Install Jentic One Beta
Connect the VAT Validation API to your agent
Jentic One is a self-hosted execution layer for AI agents. It lets your agent call the VAT Validation API, or any other public or private API you need. You set the rules, the agent never sees your credentials, and every call is logged.
Two steps, two machines. Install the instance in a safe environment, then register your agent from wherever it runs.
1
Step 1: Jentic One Host machine
# On the machine that will host your Jentic One instance:
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2F44api.dev%2F44api" | sh2
Step 2: Agent machine
# On the machine where your agent runs (keep this separate from the instance):
curl -fsSL "https://jentic.com/install.sh?src=apis&api=%2Fapis%2F44api.dev%2F44api" | sh
jentic register # connects your agent to your Jentic One instanceJentic One is in public beta. The setup above keeps your agent separate from the instance, which is what you want before using real credentials: an agent running as the same OS user as Jentic One can read its stored keys directly. Just evaluating? A single local install is fine to start. See the secure deployment guide for the tiers.
Capabilities
What an agent can do with VAT Validation API.
Validate a VAT or tax ID number for 54+ countries and get its current registration status
Retrieve the registered company name, address, and registration details tied to a VAT number
Check numbers across all 27 EU member states through the official VIES network in a single request
Validate 27 or more non-EU country tax IDs with the same consistent response shape
Control which IP addresses may call your account through the account IP whitelist
Use Cases
Patterns agents use VAT Validation API for, with concrete tasks.
★ Agent-driven VAT verification
An AI agent handling supplier or customer records can validate a VAT number the moment it is entered, confirming the number is registered and pulling back the official company name and address. Because the 44api VAT Validation API returns the same response shape for every country, the agent handles an EU number checked through VIES and a non-EU number with identical parsing logic.
Validate VAT number 69838046 for country code SI and confirm the registration status and company name returned
Supplier onboarding checks
During vendor onboarding, a finance team needs to confirm that a supplier's VAT registration is genuine before any payment is set up. The API validates the number against the official source for its country and returns the registered business name and address, so a mismatch between the claimed and registered company surfaces immediately. Coverage spans all 27 EU states plus 27 or more non-EU countries.
Validate a supplier's VAT number for country code DE and compare the returned company name against the name on file
EU cross-border invoicing compliance
Businesses selling across EU borders must confirm a customer's VAT number is valid to apply the correct zero-rated treatment. The API checks the number through the VIES network that the EU operates for exactly this purpose and returns whether it is currently valid along with the registered company details, giving a defensible record at the time of the transaction.
Check an EU customer VAT number through VIES and record whether it is currently registered before issuing a zero-rated invoice
Key Endpoints
3 endpoints — the 44api vat validation api checks vat and tax id numbers across 54+ countries and returns the registered company name, address, and registration status for each number.
METHOD
PATH
DESCRIPTION
POST
/webhook/validate-vat
Validate a VAT or tax ID number for a country and return status and company data
POST
/webhook/ip-whitelist
Manage the account IP whitelist
GET
/webhook/core/health
Report service availability
POST
/webhook/validate-vat
Validate a VAT or tax ID number for a country and return status and company data
POST
/webhook/ip-whitelist
Manage the account IP whitelist
GET
/webhook/core/health
Report service availability
Jentic AI Readiness Score
This API is usable in Jentic One now. Its AI-readiness score against Jentic's framework shows where it stands today and where improvements would make it even easier for agents to use.
V
VAT Validation API
- AI-Aware (B+)68/100
94
Foundational Compliance64
Developer Experience & Jentic Compatibility53
AI-Readiness & Agent Experience94
Agent Usability50
Security83
AI DiscoverabilityPowered by JenticScoring Framework 1.0.0 | Scoring Engine 0.4.2
Show dimension breakdown
94
Foundational Compliance
Base layer of spec validity and structural soundness.
Grade: A+Signals: 4
99%
Lint Results
Aggregated quality score from linter diagnostics, weighted by severity.
100%
Resolution Completeness
Percentage of `$ref` references that resolve successfully.
100%
Specification Validity
Checks whether the API description parses successfully and conforms to its declared specification (e.g., OpenAPI).
75%
Structural Integrity
Structural correctness score based on schema issues using logarithmic dampening.
64
Developer Experience & Jentic Compatibility
Clarity, completeness, and ingestion readiness for developers and tooling.
Grade: BSignals: 4
24%
Example Density
How richly the API is illustrated with examples.
100%
Example Validity
Percentage of examples that conform to their schemas.
33%
Response Coverage
Percentage of operations with complete response definitions (success, client error, server error).
100%
Tooling Readiness
Health of API ingestion, bundling, and resolution within Jentic pipelines.
53
AI-Readiness & Agent Experience
Semantic breadth, depth, and agent comprehension for AI systems.
Grade: C-Signals: 4
27%
Description Coverage
Coverage of descriptions across API elements.
0%
Error Standardization
Coverage of RFC 9457 Problem Details for error responses.
100%
OperationId Quality
Coverage, uniqueness, and casing consistency of operationIds for AI inference.
83%
Summary Coverage
Coverage of summaries across operations/tags/info.
94
Agent Usability
Functional utility, complexity comfort, and AI orchestration readiness.
Grade: A+Signals: 1
94%
Complexity Comfort
Agent comfort level based on API operational and structural complexity.
50
Security
Trust, risk posture, and security compliance.
Grade: C-Signals: 1
50%
Authentication Strength
Average quality of security schemes based on authentication method strength (weakest link for OAuth2).
83
AI Discoverability
Findability, semantic richness, and reasoning readiness.
Grade: ASignals: 1
83%
Descriptive Richness
Clarity and depth of descriptions across API elements.
Score it yourself
Every API in the directory is allowlisted, so you can re-score it with no key required.
npx @jentic/api-scorecard-cli score <openapi-url>Why Jentic?
What agents get from Jentic-routed access to this vendor.
Setup
Wiring the 44api VAT Validation API by hand means setting up its X-API-Key header auth and writing parsing for each country's result yourself. Through Jentic you install once, import 44api from the API Directory, store the key once, and your agent calls it.
Permission scoping
The VAT number and country code travel in the request body, not the URL path, so a rule bounds which operations your agent may call rather than which numbers it may check. You choose the operations it may call, so the account IP whitelist operation is not included unless you add it.
Credential isolation
Your 44api key is stored once, encrypted, by your own Jentic One instance and injected at execution time. It never enters the agent's prompt, logs, or context.
Intent-based discovery
Agents search Jentic by intent such as 'validate a VAT number' or 'look up company data from a VAT number', and Jentic returns the matching 44api operation with its input schema so the agent calls the right endpoint without reading the reference docs.
Related APIs
Alternatives and complements available in the Jentic catalogue.
FAQs
Specific to using VAT Validation API through Jentic.
What authentication does the 44api VAT Validation API use?
The 44api VAT Validation API authenticates with an API key sent in the X-API-Key header, as declared in its OpenAPI spec. Through Jentic the key is stored once and injected at call time, so it never appears in your agent's prompt or logs.
Can I validate non-EU VAT and tax IDs with the 44api VAT Validation API?
Yes. Alongside all 27 EU member states checked through the official VIES network, the API validates numbers for 27 or more non-EU countries, and every country returns the same response shape with registration status and company details.
What are the rate limits for the 44api VAT Validation API?
The OpenAPI spec does not state numeric rate limits for the 44api VAT Validation API. Check the vendor documentation at https://docs.44api.dev for current limits before running high-volume validations.
How do I validate a VAT number with the 44api VAT Validation API through Jentic?
Search Jentic for 'validate a VAT number', which returns the POST /webhook/validate-vat operation with its input schema, then call it with the VAT number and country code. To run it on your own infrastructure, install Jentic One from its GitHub repo.
Can I limit what my agent is allowed to do with the 44api VAT Validation API?
Yes. Write a rule that allows only the VAT validation operation, so the agent can check numbers and read company data but cannot touch the IP whitelist, and every call it makes is logged. The VAT number and country travel in the request body, so the rule bounds which operations run rather than which numbers are checked.
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