Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Exemplar 3 Complete, well-documented, and agent-ready

Stripe Tax APIAutomate sales tax, VAT, and GST compliance on all your transactions-low or no code integrations available.83.2 Drippay Tax APISales tax configuration: customer tax addresses, exemptions, business registrations, and jurisdiction rates...76.8 Adyen Tax APIThe Tax API from Adyen — 2 operation(s) for tax.67.1

Strong 1 Solid coverage with minor gaps

QuickBooks Sales Tax APIThe QuickBooks Sales Tax API is a premium API that provides programmatic access to the automated sales tax ...59.2

Developing 15 Usable, with meaningful gaps to close

Akoya Tax APIRetrieves FDX-aligned tax documents for a consumer's permissioned accounts — 1099 form variants (1099-INT, ...53.8 Check Payroll APICheck's REST API for embedding full-service payroll — companies, employees, contractors, pay schedules, pay...49.0 Xentral Tax APITax resource47.9 Anchorage Digital Tax APIThese endpoints allow the organization to manage tax. ** UNDER DEVELOPMENT **46.5 HMRC Corporation Tax APIThe HMRC Corporation Tax APIs enable accounting software to submit corporation tax returns, retrieve liabil...46.5 HMRC Customs Declarations APIThe HMRC Customs Declarations APIs enable customs software to submit import and export declarations, manage...46.5 HMRC PAYE (Pay As You Earn) APIThe HMRC PAYE APIs enable payroll software to submit employer payroll data, retrieve tax codes and employee...46.5 HMRC Self Assessment APIThe HMRC Self Assessment APIs enable software to submit and manage self assessment tax returns, income sour...46.5 Digital Tax Invoice APIRetrieve digital tax invoice data associated with expense entries for compliance and auditing in jurisdicti...45.9 Merchant Callback APIAPI enabling merchant backends to respond to Bolt checkout events including discount application, cart crea...45.5 Canal tax APIThe tax API from Canal — 1 operation(s) for tax.42.6 Anchorage Digital Tax APIThese endpoints allow the organization to manage tax. ** UNDER DEVELOPMENT **41.6 Fonoa Tax APIThe Tax API from Fonoa — 1 operation(s) for tax.41.2 Pinwheel Taxes APIThe Pinwheel Taxes API retrieves W-2, 1099-K, 1099-MISC, and 1099-NEC documents directly from a worker's pa...40.4 TaxBit APIREST API for tax compliance and information reporting: account owners, accounts, transactions, inventory, r...40.3

Thin 19 Limited public surface area

Column Tax APIREST API to embed IRS-authorized income-tax preparation and e-filing. Create a Column Tax user, obtain a sh...39.2 Truv Tax APITax document data for a connected link.39.0 Precisely APIs Tax APIThe Tax API from Precisely APIs — 2 operation(s) for tax.38.9 TIAA Tax APITax document and income data38.8 Spree Avalara AvaTax IntegrationOfficially certified Avalara AvaTax tax-calculation integration for Spree - real-time tax calculation, addr...37.7 Zeal Tax APIThe Tax API from Zeal — 4 operation(s) for tax.36.9 Salsa Tax APIEmployer and worker tax setup.34.1 magento Tax APITax configuration management including tax rates, tax rules, and tax classes used for order tax calculation.30.6 Avalara AvaTax APIAvalara AvaTax API provides global tax calculation, compliance, and reporting for businesses operating acro...30.5 IRS Modernized e-File (MeF) APIThe IRS Modernized e-File (MeF) system is the primary e-filing platform for federal tax returns. It defines...30.5 TaxJar APITaxJar provides a REST API for real-time sales tax calculations, nexus tracking, and automated tax filing. ...30.5 W-2 and 1099 Reporting TemplatesTemplates and schemas for generating IRS W-2 (wages and tax statements) and 1099 (miscellaneous income) for...30.5 IRS Public APIsThe Internal Revenue Service exposes select public datasets and tools through download endpoints, including...30.3 QuickBooks Payroll APIREST API for managing payroll, employees, paychecks, and payroll tax information within QuickBooks Online P...30.3 Duty and Tax Calculator UnifiedCarrier-agnostic duty and tax calculator that works with any global carrier; includes a 30-day free trial o...29.5 Duty and Tax DHL eCommerce AmericasCalculates duties and taxes for cross-border shipments processed through DHL eCommerce Americas.29.5 Clear Books REST APIRESTful API for integrating with Clear Books accounting software to manage invoices, payments, contacts, ba...27.5 MYOB Business APIREST-based cloud API for MYOB AccountRight, MYOB Essentials, and MYOB Business. Provides endpoints for mana...27.0 Filed APIA single GraphQL endpoint for the Filed platform. Create clients and ingest source documents into a binder,...26.9

Emerging 11 Early or largely undocumented

Signifyd Sales Tax APICalculate and remit US sales tax across jurisdictions using Signifyd's Sales Tax product. Provides nexus-aw...26.1 ADP Payroll APIThe ADP Payroll API provides programmatic access to payroll processing capabilities including earnings, ded...25.4 Asaas Bill Payments APIPay external bills (boletos, concessionárias, GPS, DARF) from the Asaas digital account, with barcode-line ...19.1 Asaas Invoices (Nota Fiscal) APISchedule, issue, and retrieve Brazilian electronic invoices (NFS-e) automatically tied to a charge or subsc...19.1 H&R Block APIH&R Block provides tax preparation templates and tools for individual and small business returns, including...15.8 QuickBooks Tax APIQuickBooks Online API provides access to tax-related financial data including income, expenses, and payroll...15.8 TurboTax APIIntuit TurboTax API enables integration with TurboTax for consumer and business tax preparation workflows, ...15.8 Xero Tax APIXero's Tax API enables accounting software and tax providers to connect to Xero for seamless tax return pre...15.8 Thomson Reuters Checkpoint APICheckpoint Search API provides access to Thomson Reuters Checkpoint tax and accounting research content inc...13.7 Thomson Reuters ONESOURCE APIONESOURCE APIs provide integration with Thomson Reuters tax compliance software including income tax, indir...13.7 Heartland Payroll APIHeartland's Payroll APIs support employee payroll processing, tax filings, and HR integrations for small to...12.2

Minimal 2 Almost no public developer surface

Tax Controversy & Financial Crimes ReportAttorney-authored LexBlog covering tax controversy, IRS disputes, and financial crime defense.7.9 IntegrationsPre-built integrations across credit bureaus (FICO LiquidCredit, PayNet, D&B, Experian, Equifax, TransUnion...7.6

Score breakdown

Frequency

60.3

log-scaled weighted occurrences

Breadth

3.0

spread across providers

Quality lift

31.2

mean composite of providers using it

Cohesion

15.5

strength of nearest seed neighbor

Where this tag comes from

Provider tag86

Api tag50

Openapi tag14

Openapi op tag56

Cohort brief

Auto-generated

The 110 providers in the APIs.io catalog tagged Tax, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

110

all scored

Mean Kin Score

25.9

+5.2 vs catalog 20.7

Mean Agent Readiness

12.7

+3.0 vs catalog 9.7

Spread

1.5–83.2

median 23.1 · σ 16.8

How the 110 split by band

Exemplar 3Strong 1Developing 20Thin 25Emerging 36Minimal 25

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Access Clarity	31.5	22.3	+9.2	110
Contract Quality	23.3	17.5	+5.8	110
Operational Transparency	16.7	11.3	+5.4	110
Discoverability	63.8	60.4	+3.4	110
Developer Ergonomics	20.9	17.9	+3	110
Contract Governance	6.5	6.4	+0.1	110

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes

Artifact	This cohort	Catalog	Difference
MCP server (any)	21%	16%	+5
MCP server (first-party)	8%	7%	+1
Agent Skills	0%	0%	0
OAuth scopes	10%	9%	+1
Security	98%	88%	+10
Arazzo workflows	5%	2%	+3
Governance rules	14%	13%	+1

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score

1 Stripe 83.2
2 Drippay 76.8
3 Adyen 67.1
4 Intuit 59.2
5 Akoya 53.8
6 FlowAccount 51.3
7 Cadana 50.3
8 Swap 49.8
9 Check Technologies 49
10 inFakt 48.2

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Tax

Providers using this tag (110)

APIs with this tag (51)