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 11 Complete, well-documented, and agent-ready

HubSpot Taxes APIThe taxes API enables you to create and associate tax objects as part of the pricing details for quotes and...91.6 Acronis Taxes APIThe Taxes API from Acronis — 1 operation(s) for taxes.83.9 Stripe Tax APIAutomate sales tax, VAT, and GST compliance on all your transactions-low or no code integrations available.81.6 Lightspeed Commerce Taxes APITax operations78.8 Drippay Tax APISales tax configuration: customer tax addresses, exemptions, business registrations, and jurisdiction rates...72.0 GetResponse Taxes APITaxes API documentation71.6 AvalaraAutomate compliance with Avalara MCP servers for AI-driven tax workflows and APIs. Have your agent call our...70.9 Avalara Tax Content for Retail Configuration APIThe Avalara Tax Content for Retail Configuration API automates tax content delivery for brick-and-mortar bu...70.9 AvaTax SOAP APIThe AvaTax SOAP API exposes the most commonly used features for interacting with the AvaTax service, allowi...70.9 License Guidance Order APIThe Avalara License Guidance Order API enables placing Avalara License Guidance orders and populating quest...70.9 Self-Serve Tariff Classification APIThe Avalara Cross Border Tariff Content API classifies products based on provided product information for t...70.9

Strong 8 Solid coverage with minor gaps

LeafLink Taxes APIThe taxes API from LeafLink — 2 operation(s) for taxes.61.0 Kaseya Taxes APIThe Taxes API from Kaseya — 7 operation(s) for taxes.59.6 Intuit APIsIntuit APIs provide developers with access to a wide range of services and functionalities to help them bui...59.2 QuickBooks Sales Tax APIThe QuickBooks Sales Tax API is a premium API that provides programmatic access to the automated sales tax ...59.2 Moneyhub Tax APIThe tax API from Moneyhub — 1 operation(s) for tax.57.1 BigCommerce Taxes APIThe Taxes API from BigCommerce — 2 operation(s) for taxes.56.4 ZenLedger Taxes APIRetrieve the tax calculation for an aggregated portfolio.56.2 Coperniq Taxes APIThe taxes API from Coperniq — 1 operation(s) for taxes.55.4

Developing 18 Usable, with meaningful gaps to close

Xentral Tax APITax resource53.5 Precisely APIs Tax APIThe Tax API from Precisely APIs — 2 operation(s) for tax.53.2 Akoya Tax APIRetrieves FDX-aligned tax documents for a consumer's permissioned accounts — 1099 form variants (1099-INT, ...52.0 Conekta Taxes APIThe Taxes API from Conekta — 2 operation(s) for taxes.52.0 OptionsAhoy MCP ServerRemote Model Context Protocol server at https://optionsahoy.com/mcp (Streamable HTTP, protocol version 2024...51.7 TaxJar Taxes APISales tax calculation50.6 Zoho Inventory Taxes APITaxes Module49.1 Digital Tax Invoice APIRetrieve digital tax invoice data associated with expense entries for compliance and auditing in jurisdicti...47.4 Anchorage Digital Tax APIThese endpoints allow the organization to manage tax. ** UNDER DEVELOPMENT **47.1 Fonoa Tax APIThe Tax API from Fonoa — 1 operation(s) for tax.43.3 Co-Legal Public Assistant (A2A Agent)Agent2Agent 1.0 surface of Co-Legal's public legal/fiscal assistant. The agent card at https://agent.co-leg...42.3 Paraşüt Taxes APIThe Taxes API from Paraşüt — 5 operation(s) for taxes.42.0 TaxBit APIREST API for tax compliance and information reporting: account owners, accounts, transactions, inventory, r...41.0 HMRC Corporation Tax APIThe HMRC Corporation Tax APIs enable accounting software to submit corporation tax returns, retrieve liabil...40.9 HMRC Customs Declarations APIThe HMRC Customs Declarations APIs enable customs software to submit import and export declarations, manage...40.9 HMRC PAYE (Pay As You Earn) APIThe HMRC PAYE APIs enable payroll software to submit employer payroll data, retrieve tax codes and employee...40.9 HMRC Self Assessment APIThe HMRC Self Assessment APIs enable software to submit and manage self assessment tax returns, income sour...40.9 Canal Tax APIThe tax API from Canal — 1 operation(s) for tax.40.4

Thin 23 Limited public surface area

lemon.markets Taxes APIThe Taxes API from lemon.markets — 4 operation(s) for taxes.38.8 Column Tax APIREST API to embed IRS-authorized income-tax preparation and e-filing. Create a Column Tax user, obtain a sh...38.0 Spree Avalara AvaTax IntegrationOfficially certified Avalara AvaTax tax-calculation integration for Spree - real-time tax calculation, addr...37.8 Casey's General Stores Taxes APIThe Taxes API from Casey's General Stores — 1 operation(s) for taxes.37.5 CyberSource Taxes APItax calculation service37.5 Loyverse Taxes APITax definitions applied to items.36.0 Filed APIA single GraphQL endpoint for the Filed platform. Create clients and ingest source documents into a binder,...35.9 Truv Tax APITax document data for a connected link.35.8 Quaderno Taxes APIReal-time tax rate calculation, jurisdictions, tax codes, and tax ID validation.35.4 Hnry Platform APIThe REST API behind the Hnry app. It backs the Hnry iOS/Android clients and the published Hnry Zapier integ...35.3 Lago Taxes APIEverything about Tax collection34.5 QuickBooks Payroll APIREST API for managing payroll, employees, paychecks, and payroll tax information within QuickBooks Online P...34.2 TIAA Tax APITax document and income data33.8 freee Taxes APITax codes (税区分) available to a company.33.7 Zeal Tax APIThe Tax API from Zeal — 4 operation(s) for tax.33.7 Salsa Tax APIEmployer and worker tax setup.32.0 MYOB Business APIREST-based cloud API for MYOB AccountRight, MYOB Essentials, and MYOB Business. Provides endpoints for mana...31.6 FreshBooks Taxes APIThe Taxes API from FreshBooks — 1 operation(s) for taxes.31.1 magento Tax APITax configuration management including tax rates, tax rules, and tax classes used for order tax calculation.30.7 Cacheflow Taxes APIThe Taxes API from Cacheflow — 4 operation(s) for taxes.29.3 Paylocity Taxes APIThe Taxes API from Paylocity — 2 operation(s) for taxes.29.1 IRS Public APIsThe Internal Revenue Service exposes select public datasets and tools through download endpoints, including...29.0 Clear Books REST APIRESTful API for integrating with Clear Books accounting software to manage invoices, payments, contacts, ba...28.9

Emerging 13 Early or largely undocumented

Duty and Tax Calculator UnifiedCarrier-agnostic duty and tax calculator that works with any global carrier; includes a 30-day free trial o...25.9 Duty and Tax DHL eCommerce AmericasCalculates duties and taxes for cross-border shipments processed through DHL eCommerce Americas.25.9 Signifyd Sales Tax APICalculate and remit US sales tax across jurisdictions using Signifyd's Sales Tax product. Provides nexus-aw...25.0 Found TaxesReal-time tax estimates with automatic tax savings set-aside, automatic write-offs, tax form generation, mi...22.0 Asaas Bill Payments APIPay external bills (boletos, concessionárias, GPS, DARF) from the Asaas digital account, with barcode-line ...19.6 Asaas Invoices (Nota Fiscal) APISchedule, issue, and retrieve Brazilian electronic invoices (NFS-e) automatically tied to a charge or subsc...19.6 Aviationstack Taxes APIThe Taxes API from Aviationstack — 1 operation(s) for taxes.19.6 Atomic Tax APITax retrieves W-2s, 1099s, and other tax documents directly from the user's payroll provider, and unlocks t...18.5 Rates and Limits JSON APIKeyless, unauthenticated REST-style JSON API serving US tax, payroll, benefits, and wage figures with bundl...18.3 Heartland Payroll APIHeartland's Payroll APIs support employee payroll processing, tax filings, and HR integrations for small to...15.6 Insperity Payroll & Tax APIUpdate an employee's compensation and retrieve general ledger information post payroll. Three published ope...14.3 Thomson Reuters Checkpoint APICheckpoint Search API provides access to Thomson Reuters Checkpoint tax and accounting research content inc...13.4 Thomson Reuters ONESOURCE APIONESOURCE APIs provide integration with Thomson Reuters tax compliance software including income tax, indir...13.4

Minimal 2 Almost no public developer surface

IntegrationsPre-built integrations across credit bureaus (FICO LiquidCredit, PayNet, D&B, Experian, Equifax, TransUnion...8.0 Tax Controversy & Financial Crimes ReportAttorney-authored LexBlog covering tax controversy, IRS disputes, and financial crime defense.6.3

Companies reaching this through an API (46)

These companies publish an API, specification or operation carrying “Tax” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Score breakdown

Frequency

63.5

log-scaled weighted occurrences

Breadth

2.5

spread across providers

Quality lift

28.2

mean composite of providers using it

Cohesion

18.0

strength of nearest seed neighbor

Where this tag comes from

Provider tag98

Api tag77

Openapi tag29

Openapi op tag89

Cohort brief

Auto-generated

The 95 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

all scored

Mean Kin Score

23.4

+0.5 vs catalog 22.9

Mean Agent Readiness

10.1

-1.8 vs catalog 11.9

Spread

0–70.9

median 18.8 · σ 15.7

How the 95 split by band

Exemplar 1Strong 4Developing 13Thin 17Emerging 36Minimal 24

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Access Clarity	32.8	26.5	+6.3	95
Discoverability	58.8	58.1	+0.7	95
Operational Transparency	14.2	13.7	+0.5	95
Developer Ergonomics	22.2	23.2	-1	95
Contract Governance	4.9	6.3	-1.4	95
Contract Quality	15	17.6	-2.6	95

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)	15%	14%	+1
MCP server (first-party)	13%	12%	+1
Agent Skills	0%	0%	0
OAuth scopes	6%	11%	-5
Security	98%	98%	0
Arazzo workflows	4%	2%	+2
Governance rules	8%	14%	-6

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 Avalara 70.9
2 flatin.pt 59.4
3 FlowAccount 59.3
4 Intuit 59.2
5 Wingspan 56.5
6 OptionsAhoy 51.7
7 Cadana 48.2
8 inFakt 48.1
9 Swap 47.5
10 MileIQ 45.1

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Tools for tags

7 MCP tools reach this

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get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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The distribution (Pro)

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Tax

Providers using this tag (98)

APIs with this tag (75)