4 Best APIs for No API Key Required in Nigeria

VATComply is a completely free, open REST API for EU VAT compliance — providing current VAT rates for all 27 European Union member states and real-time EU VAT number validation via the official VIES (VAT Information Exchange System). No API key is required, no registration is needed, and there is no cost to use it. It is a particularly valuable tool for Nigerian businesses and developers who sell digital products or physical goods to European customers and need to handle EU tax obligations correctly. **What VATComply Does** VATComply provides two primary data services: **1. EU VAT Rates** Returns the current standard and reduced VAT rates for any EU member state. Different EU countries apply significantly different VAT rates. For example: - Germany: 19% standard, 7% reduced - France: 20% standard, 5.5% and 2.1% reduced - Hungary: 27% standard (highest in EU) - Luxembourg: 17% standard (lowest in EU) - Ireland: 23% standard, 13.5% reduced A single API call returns the complete rate structure for any country by ISO code. The historical rates endpoint returns VAT rates that were in effect on any given date — useful for auditing past invoices. **2. EU VAT Number Validation (VIES)** Validates whether an EU VAT number is genuine and active by querying the VIES database maintained by the European Commission. This is critical for B2B invoicing: when a Nigerian company sells to an EU business, the EU business provides its VAT number to receive a zero-rated invoice (reverse charge). If the VAT number is invalid, the Nigerian supplier may be liable for VAT themselves. VIES validation returns: - Whether the VAT number is valid and active - The business name associated with the VAT registration - The registered business address - The country of registration **How Developers Use VATComply** No authentication is required. Make a simple GET request: For VAT rates by country: GET https://api.vatcomply.com/rates?base=EUR For a specific country (Nigeria to EU): GET https://api.vatcomply.com/rates?country_code=DE For VIES VAT number validation: GET https://api.vatcomply.com/vat?vat_number=DE123456789 The response is a standard JSON object. Integration typically takes less than 30 minutes and requires no SDK. **Nigerian Business Context** Nigerian technology companies and businesses increasingly sell to European customers through several channels: - **SaaS platforms**: Nigerian tech startups selling software subscriptions to EU enterprises - **Digital products**: Developers selling apps, tools, templates, or digital downloads to European users - **Consulting/freelancing**: Nigerian developers and agencies invoicing EU clients - **Physical exports**: Manufactured goods, agricultural products, artisanal items exported to Europe In all these scenarios, EU VAT regulations apply. Since 2021, the EU's VAT on Digital Services (VADS) rules require non-EU businesses that exceed €10,000 in EU digital sales annually to register for VAT in the EU (via the OSS — One Stop Shop — scheme) and collect VAT from EU consumers. VATComply helps Nigerian businesses: 1. Determine the correct VAT rate for each EU customer's country at checkout 2. Validate EU VAT numbers provided by EU business customers to apply zero-rating 3. Maintain historical rate records for audit purposes 4. Automate the rate lookup so prices display correctly in EU-targeted storefronts **EU VAT Rates for Nigerian SaaS Companies** A Nigerian SaaS company with European customers faces a common scenario: a customer in Germany pays €100 for a subscription. The Nigerian company must: 1. Confirm whether the German customer is a business (has a valid EU VAT number) or an individual consumer 2. If a business (B2B): validate the VAT number with VIES, apply reverse charge (0% VAT), issue a zero-rated invoice mentioning "Reverse Charge" and the customer's VAT number 3. If an individual (B2C): charge German VAT at 19% on top of the €100 price VATComply automates steps 1 and 3 with a single API call. **VIES Validation for Zero-Rated B2B Invoicing** When Nigerian exporters or service providers invoice EU businesses, they must hold evidence that the customer is a registered EU business. VIES validation provides this evidence. Best practice: 1. At checkout or invoice generation, query VATComply with the customer's EU VAT number 2. Store the validation result (business name, address, timestamp) with the invoice record 3. If validation fails, do not apply zero-rating — charge VAT at the customer's local rate This creates a defensible audit trail in case of an EU tax authority inquiry. **Historical VAT Rates** VATComply's historical rates endpoint is useful for: - Amending past invoices with the correct rate that was in effect at the time - Tax return preparation covering multiple periods - Compliance audits requiring documentation of rates applied in prior years **Pricing and Rate Limits** VATComply is completely free. No pricing tiers, no API key, no account required. There are no documented rate limits for normal business usage, though extremely high-frequency automated calls may be throttled. For rate lookups (which rarely change and can be cached), a single daily refresh is sufficient. For VIES validation (which requires a live call per customer), the volume of real customer transactions is typically well within acceptable limits. **Compliance Considerations** VATComply queries the live VIES system operated by the European Commission. VIES itself can experience downtime or delays — if validation fails due to VIES being unavailable (not due to an invalid VAT number), the API will return an error. Production applications should handle VIES downtime gracefully, either retrying or falling back to manual validation. VATComply does NOT cover: - Nigerian VAT (FIRS is the Nigerian tax authority; use FIRS APIs or TaxPro Max for Nigerian VAT) - US sales tax (use TaxJar or Avalara) - UK VAT (post-Brexit UK is not in the EU VIES system) - VAT for non-EU countries **Company Background** VATComply is a developer-maintained open API project. The codebase is publicly available and the service is provided as a public good for developers who need EU VAT data without the overhead of integrating paid commercial tax APIs. It sources its rates data from official EU publication channels and VIES for real-time validation. **Alternatives** Commercial alternatives include Avalara (expensive, enterprise-focused), TaxJar (US-focused), and Stripe Tax (integrated into Stripe billing). For Nigerian companies already using Stripe, Stripe Tax automatically handles EU VAT calculation. VATComply's advantage is being completely free and requiring no account setup — ideal for bootstrapped Nigerian startups entering the EU market for the first time. VATComply is a must-have free tool for any Nigerian developer or business dealing with European customers, enabling correct EU tax compliance with minimal integration effort.

RxNav is a suite of free, publicly accessible REST APIs operated by the US National Library of Medicine (NLM), part of the National Institutes of Health (NIH). RxNav provides programmatic access to several authoritative drug databases: RxNorm (the standard drug naming vocabulary), RxTerms (simplified drug terms for clinical documentation), NDF-RT (drug classification and pharmacological properties), and RxClass (drug class relationships). Together, these APIs form a comprehensive drug intelligence layer that is completely free, requires no API key, and is globally accessible — making it a foundational resource for Nigerian health tech developers building drug reference applications, clinical decision support tools, and pharmacy systems. **What RxNav Does** RxNav exposes multiple API endpoints organized around drug data needs: **1. RxNorm API** RxNorm is the US standard vocabulary for clinical drugs, providing normalized names and unique identifiers (RxCUI — RxNorm Concept Unique Identifier) for every drug. The RxNorm API allows: - **Drug lookup by name**: Search for a drug by brand name, generic name, or ingredient and receive its RxCUI - **NDC to RxNorm conversion**: Convert US National Drug Code (NDC) package codes to normalized RxNorm concepts - **Drug properties**: Get all synonyms, brand names, and generic names for a given drug concept - **Related concepts**: Navigate the drug concept hierarchy — from ingredient to clinical drug form to branded pack **2. Drug Interaction API** The most clinically critical feature: given a list of drug RxCUIs, the interaction API returns known drug-drug interactions (DDI) sourced from several interaction databases (DrugBank, ONCHigh, etc.). Returns interaction severity and description. Essential for clinical decision support. **3. RxClass API** Drug classification by multiple taxonomies: - Pharmacological class (mechanism of action, physiological effect, chemical structure) - Drug class hierarchies (EPC class, VA class, ATC class, MESH) - Allows lookup of all drugs in a class, or the classes a specific drug belongs to **4. RxTerms API** Simplified drug terms for prescribing interfaces — shows how a drug would appear in a clinical dropdown, e.g., "Metformin 500 MG Oral Tablet" in a standardized, concise format. **5. Spelling Suggestions** Given a misspelled drug name, returns likely intended drug names — useful for search interfaces in clinical apps where users may misspell drug names. **How Developers Use RxNav** No API key required. Direct REST calls: Drug lookup: ``` GET https://rxnav.nlm.nih.gov/REST/drugs.json?name=metformin ``` Drug interactions for a list of RxCUI codes: ``` GET https://rxnav.nlm.nih.gov/REST/interaction/list.json?rxcuis=207106+152923 ``` All drugs in a class: ``` GET https://rxnav.nlm.nih.gov/REST/rxclass/classMembers.json?classId=N0000175743&relaSource=FDASPL ``` Responses are JSON (or XML if specified). The API is RESTful, stateless, and well-documented at rxnav.nlm.nih.gov. **Pricing and Rate Limits** Completely free. Operated as a public service by the US government. No API key required. No documented hard rate limits for normal usage — but extremely aggressive automated scraping should be avoided as a courtesy. **Nigerian Relevance** RxNav's drug databases are US-centric (based on US NDC codes and FDA-approved drug names), but their utility for Nigerian health tech is significant because: 1. Most drugs used in Nigeria are manufactured by global pharmaceutical companies with US FDA approvals. The active ingredients (metformin, artemether, lopinavir, amoxicillin, chloroquine, etc.) have RxNorm entries regardless of the country of use. 2. Drug interaction data is pharmacological — the interaction between metformin and contrast agents is the same in Nigeria as in the US. RxNav's interaction database provides globally applicable clinical warnings. 3. Nigerian medical students and pharmacists study pharmacology using international references (BNF, Goodman & Gilman) that align with RxNorm's drug classification. RxClass provides programmatic access to the same classification frameworks. **Drug Interaction Checking for Nigerian Hospitals** Polypharmacy (patients taking multiple medications simultaneously) is a significant safety concern in Nigerian hospitals. A Nigerian hospital's prescribing system can integrate RxNav's interaction API to: 1. When a doctor adds a new drug to a patient's prescription, look up the RxCUI for the new drug and all current medications 2. Query the interaction API with all drug RxCUIs 3. Display any identified interactions with severity rating and description 4. Require the doctor to acknowledge or override the warning before finalizing the prescription This is a potentially life-saving feature that can be implemented at near-zero cost using RxNav. **Generic Drug Substitution** In Nigeria's cost-sensitive healthcare market, patients and pharmacists frequently need to find affordable generic alternatives to expensive branded drugs. RxNav's concept relationship data allows building a brand-to-generic lookup: given a brand name (e.g., "Glucophage"), retrieve the ingredient (metformin), then list all drug products containing that ingredient as generics. **Compliance Considerations** RxNav data is US drug data. Drug names, dosages, and approvals may differ between US and Nigerian regulatory contexts. Applications should clearly indicate data source and direct users to NAFDAC for Nigeria-specific drug registration status. RxNav data is public domain and freely usable in any application. **Company Background** RxNav is developed and maintained by the Lister Hill National Center for Biomedical Communications, a research center within the US National Library of Medicine (NLM), part of the National Institutes of Health (NIH). NLM is the world's largest biomedical library and operates numerous free public APIs including PubMed, ClinicalTrials.gov, and MedlinePlus. RxNav has been publicly available since 2009 and is widely used in health IT systems globally. RxNav is one of the most valuable free drug data APIs available for health tech developers anywhere in the world, including Nigeria.