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 1 Complete, well-documented, and agent-ready

Telr QuickLink and E-Invoicing APIRemote creation of QuickLink payment links and e-invoices with extra data fields, for merchants who collect...69.7

Strong 5 Solid coverage with minor gaps

Candid Health Patient Collections APIManage patient invoicing, payments, refunds, and accounts receivable. Automates patient billing workflows a...64.7 HyperPay HyperBillHyperBill issues invoices and shareable payment links that collect payment through the HyperPay platform wi...64.2 Malt Exposed APIsMalt's publicly documented API surface, served from api.malt.com and documented with Stoplight Elements aga...59.5 Pabbly Subscription Billing APIREST API for Pabbly Subscription Billing — 95 documented operations across customers, subscriptions, produc...57.3 Versapay API ReferenceThe core Versapay platform REST API (v1.3.35, OpenAPI 3.0.0, 86 documented paths) covering the Collaborativ...56.2

Developing 9 Usable, with meaningful gaps to close

Semble Billing & Payments APIGraphQL surface for practice finances — invoices, invoice payments and line items, account statements, prod...52.2 DealHub Subskribe APIThe subscription management, usage-based billing and revenue recognition API DealHub acquired with Subskrib...49.8 Coupa Invoicing APIThe Coupa Invoicing API provides RESTful endpoints for creating, updating, and querying invoices associated...49.1 Deskera Books APIREST API for Deskera Books, the cloud ERP and accounting product — contacts, products, accounts, invoices, ...49.0 Request Finance AP and AR APIThe Accounts Payable and Receivable REST API for issuing invoices, accepting crypto and fiat payments, runn...45.6 Spotnana Invoicing APIAPIs to manage invoicing.43.7 Depositphotos Enterprise APIThe Enterprise API provides organizations with full content licensing workflows including searching 331M+ a...43.6 CyberSource Invoicing APICreates and manages payment invoices with customizable fields, due dates, and customer information. Generat...40.3 National Australia Bank (NAB) Gateway Payments APINAB's first-party merchant payments REST API platform (the NAB Gateway / NAB Transact developer portal at n...40.0

Thin 32 Limited public surface area

Zoho InvoiceThe Zoho Invoice API allows you to perform all the operations that you do with the web client. It is built ...38.5 DSV Invoice APIRetrieves freight invoice detail for DSV air, sea and rail shipments, including carrier SCAC, master and ho...38.1 Outpost Merchant of Record APIREST API to issue proforma invoices for B2B customers paying by bank transfer, receive settlement webhooks,...37.7 UNFI EDI IntegrationUNFI supports Electronic Data Interchange (EDI) for automated exchanges of purchase orders, invoices, and f...37.1 Cora APICora's transactional banking API for Direct Integration: registered boleto and carnê (installment) issuance...35.3 Fatora REST APIFatora's REST API for hosted-checkout payment collection, card tokenization, refunds and payment verificati...35.3 Harvest API v2REST API for managing clients, projects, tasks, time entries, expenses, invoices, estimates, and users in H...35.3 FreeAgent REST APIRESTful API for the FreeAgent cloud accounting platform. Provides full access to invoices, estimates, conta...34.6 MyFatoorah Invoicing APICreate invoices and payment links.34.6 Zenskar APIZenskar's REST API for billing, contracts, usage metering, invoicing, payments, credit notes, and accountin...34.4 Autopay Accounting APIThe Autopay Accounting API provides Autopay invoicing data to external accounting and ERP systems, enabling...33.7 Wave Financial GraphQL APIGraphQL API providing programmatic access to Wave accounting features including businesses, customers, invo...33.0 FreshBooks REST APIREST API for FreshBooks providing CRUD access to clients, invoices, estimates, expenses, projects, time ent...32.7 FreshBooks Webhooks (Callbacks API)Event delivery surface for the FreshBooks Callbacks API. Subscribers register an HTTPS endpoint, complete a...32.7 Tabs Platform APIREST API for the Tabs revenue automation platform that exposes the core data model of customers, contracts,...32.4 Geidea Pay by Invoice APICreate, update, fetch, delete, and send payment invoices (KSA) that customers settle through a Geidea-hoste...32.1 Geidea Pay by Link APIProgrammatically create, update, fetch, delete, and send (by email or SMS) shareable payment links so custo...32.1 Billogram v2 APIRESTful JSON API for managing invoices (billograms), customers, items, credit invoices, payment sources, of...32.0 Oyster HR APIREST API for global employment operations including hiring, payroll, benefits, time off, expenses, invoicin...32.0 Cacheflow APIREST API for the full Cacheflow quote-to-cash surface: proposals (quotes) and proposal items, product catal...30.9 Exact Online REST / OData APIREST and OData API (v1) for Exact Online covering financials, sales, purchasing, inventory, HRM, CRM, proje...29.7 Cegid Click & Finance APIREST API for the Koalaboox / Cegid Click & Finance invoicing and invoice-financing platform. Resource-orien...29.1 Zoho Invoice APIREST API for managing organizations, contacts, items, invoices, estimates, credit notes, recurring invoices...29.0 Holded Invoicing APIThe Invoicing API from Holded — 15 operation(s) for invoicing.28.5 Holded REST APIREST API for managing invoicing, contacts, products, accounting, projects, employees, and CRM records insid...28.5 MakeLeaps APIREST API for the MakeLeaps cloud invoicing platform. Authenticated with OAuth 2.0 client-credentials agains...28.4 Accelo REST APIREST API for Accelo with CRUD access to companies, contacts, activities, tasks, projects (jobs), milestones...28.1 NYISO Finance Invoicing APIThe Invoicing component of NYISO's Finance APIs, retrieving daily reconciliation data for both settlements ...28.1 Iugu APIRESTful API providing 140+ endpoints for payment processing, customer management, invoicing, subscriptions,...27.9 Clear Books REST APIRESTful API for integrating with Clear Books accounting software to manage invoices, payments, contacts, ba...27.5 Fawaterak API v2REST API for the EasyPay/Fawaterak payment gateway. Authenticated with a vendor Bearer token, it lists avai...26.5 Deluxe Payments Platform — Invoice Experience APIThe DPP Invoice Experience API publishes eleven operations for merchant invoicing — create a draft, modify ...26.4

Emerging 14 Early or largely undocumented

Ariba Network APIEnables suppliers and buyers to exchange business documents and collaborate on the Ariba Network.26.1 xCBL — XML Common Business LibraryxCBL 4.0 is a royalty-free library of XML business documents and reusable components for business-to-busine...26.0 Novo PaymentsNovo money movement - invoicing, ACH transfers, and faster payouts (Express ACH). These capabilities are de...25.0 VAT API v2REST API for EU and UK VAT compliance including VAT rate lookups by country, VAT number validation against ...23.1 Found InvoicingCreate and send invoices, track their status, and get paid directly into the Found account, with invoice in...22.9 Certinia Billing Central APIGlobal Apex service classes for subscription and usage billing. BillingService, BillingDocumentsService, Bi...21.2 Coupa Core APIThe Coupa Core API is a UTF-8, RESTful interface (XML and JSON) for creating, updating, and acting on indiv...20.9 DSDC FTL Invoice and Documents APIInvoicing and supporting document exchange for full truckload movements. Published as 1.0.0-public-preview.20.5 BillDesk CX+ Deep APIDirect REST API access for advanced payment processing, giving merchants full control over checkout UX. Sup...20.1 QuickBooks Online Accounting APIREST API for managing QuickBooks Online accounting entities including Customer, Vendor, Employee, Item, Inv...18.1 Carepatron Billing API (Modeled)Modeled product-area API for billing - invoices, payments, and insurance claim management. endpointsModeled...18.0 Debitura Customer APIFor creditors. Uploading B2B and B2C invoices to collection, then tracking cases, contracts, payments and t...16.6 Heartland Bill Pay APIThe Heartland Bill Pay API enables invoice and bill payment processing for merchants accepting recurring or...12.2 LEAP Time & Billing APIModeled time recording, invoicing, and billing surface, evidenced by LEAP's own marketed "automatic timekee...11.2

Minimal 4 Almost no public developer surface

Knight-Swift EDI IntegrationKnight-Swift Transportation supports EDI integration for freight tendering, shipment tracking, and invoicin...10.6 UBS QR Portal APIA free programmatic QR-bill creation service supporting the Swiss QR payment standard. Returns QR bills in ...10.4 CN eBillCN eBill is the customer tool for managing rail freight invoices, account statements, and online bill payme...8.4 ServicingLease and loan servicing covering invoicing, collections, portfolio management, and asset-level financial t...7.6

Score breakdown

Frequency

65.2

log-scaled weighted occurrences

Breadth

5.4

spread across providers

Quality lift

40.9

mean composite of providers using it

Cohesion

19.5

strength of nearest seed neighbor

Where this tag comes from

Provider tag165

Api tag65

Openapi tag2

Openapi op tag31

Cohort brief

Auto-generated

The 197 providers in the APIs.io catalog tagged Invoicing, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers

197

all scored

Mean Kin Score

33.7

+13.0 vs catalog 20.7

Mean Agent Readiness

19.5

+9.8 vs catalog 9.7

Spread

3–71.8

median 34.1 · σ 15.2

How the 197 split by band

Exemplar 3Strong 20Developing 42Thin 72Emerging 48Minimal 12

Facet averages, against the whole catalog

Facet	This cohort	Catalog	Difference	Scored
Contract Quality	35.2	17.5	+17.7	197
Access Clarity	36.4	22.3	+14.1	197
Developer Ergonomics	31.5	17.9	+13.6	197
Discoverability	71	60.4	+10.6	197
Operational Transparency	21.7	11.3	+10.4	197
Contract Governance	9.5	6.4	+3.1	197

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)	34%	16%	+18
MCP server (first-party)	14%	7%	+7
Agent Skills	0%	0%	0
OAuth scopes	21%	9%	+12
Security	98%	88%	+10
Arazzo workflows	2%	2%	0
Governance rules	12%	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 Square 71.8
2 Telr 69.7
3 Pennylane 66.5
4 Candid Health 64.7
5 FieldPulse 64.3
6 HyperPay 64.2
7 Slash 63.7
8 Malt 59.5
9 Intuit 59.2
10 Wingspan 58.9

Work with this as data

Every tag here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for tags

7 MCP tools reach this

find_tagsBrowse and filter every tag in the catalog.
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.

All 92 tools

Call it yourself

curl for this page

This tag

curl "https://apis.io/api/v1/tags/invoicing"

All tags

curl "https://apis.io/api/v1/tags?limit=25"

As a scored cohort

curl "https://apis.io/api/v1/cohorts/tag/invoicing"

The distribution (Pro)

curl "https://apis.io/api/v1/cohorts/tag/invoicing/stats" \
  -H "X-API-Key: $APIS_IO_KEY"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

Invoicing

Providers using this tag (197)

APIs with this tag (65)