E-invoicing and Tax Compliance (certified operators)
Certified-operator market (peppol ap/smp certification, french pa immatriculation, us sst csp). The Kin Score Market layer reads each provider in its market: who it integrates with, how deep those integrations go, and where the market publishes its own structure. Methodology.
Where this market publishes its structure
- OpenPeppol certified service providers (peppol.org/members/peppol-certified-service-providers) machine-readable, 740 members (733 AP, 414 SMP certified) across Peppol Authorities; no website column, contact email domain used
- DGFiP liste des plateformes agreees (impots.gouv.fr, XLSX) machine-readable, 166 operators: 155 immatriculated, 11 awaiting interop tests
- Streamlined Sales Tax Certified Service Providers (streamlinedsalestax.org) machine-readable, 6 CSPs (Accurate Tax, Avalara, Avior, Exactor/Intuit, Sovos, TaxCloud)
- Peppol Directory (directory.peppol.eu REST) machine-readable, not used: participants are the END-USER companies reachable on Peppol, not service providers
- Italy SdI intermediaries not machine-readable: no public intermediary register; Italian APs appear on the OpenPeppol list under AGID
- Poland KSeF not machine-readable: no service-provider register published
- ZATCA e-invoicing solution providers (zatca.gov.sa) not machine-readable: SharePoint list rendered by JS; no rows in the HTML
- Coupa App Marketplace / coupa.com/partners not machine-readable: 403 to non-browser clients
- SAP Store (SAP Ariba apps) not machine-readable: 403 (redirects to sap.com/store.html)
Own = declares at least one integration itself; covered = visible only because an aggregator, standards body, regulator or partner contract names it; distribution-only = listed only on cloud marketplaces it sells through, a channel reported beside, never counted as its own declared integrations; undeclared = nothing we can read, so no number; declares_compatibility = providers with a `compatible` shape vote, report only (kin, 2026-10-13): never counted as own, never in depth or position.
Taxonomy how this market maps onto apis.io
Derived 2026-10-23 from the 56 providers in this market we could resolve in the catalog. The percentage is the share of those providers carrying each one; it describes the market, not the tag or industry. Tag groups have no page of their own yet, so they are listed unlinked.
| Tags | Tax 41%, Accounting 36%, Fintech 32%, Invoicing 32% |
|---|---|
| Tag groups | Accounting 77%, Fintech 43%, Tax Compliance 38% |
| Industries | Accounting & Finance Operations 59%, Tax & Compliance Software 52%, Financial Technology 34%, Payments & Money Movement 23% |
| Capabilities | Financial Management 29%, Tax Management 25% |
share of resolved cohort carrying it; tags >=0.20 & >=3 members (max 12, junk dropped), tag_groups >=0.20 (cooccurrence, non-cross-cutting; max 8), industries >=0.20 (max 6), areas >=0.10 (max 6; areas are keyword-matched and sparse), capabilities L1 >=0.20 (max 8); derive-market-taxonomy.py
Leaders by position (provisional)
Provisional: grouped by position, depth compared within a position only. Distribution (cloud marketplaces) and iPaaS bridges are counted beside position, never inside it. Unknown-builder listings are left out of position shares and counted here.
gravity 2 · other companies invest to build on it
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| Xero | 55.8 | 153 | 135 / 18 | 0 | 1 | 7 | partner-built 87%, provider-built 2%, ipaas-bridge 4%, contract 1%, standard 3%, covered 1%, builds-on-platform 2%, distribution 1% |
| Coupa | 53.0 | 32 | 23 / 9 | 0 | 1 | 2 | partner-built 72%, provider-built 3%, ipaas-bridge 6%, contract 3%, standard 6%, builds-on-platform 6%, distribution 3% |
builds-on 12 · publishes apps on other platforms' stores
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| Descartes Systems Group | 56.7 | 5 | 0 / 5 | 0 | 0 | 0 | contract 20%, standard 20%, builds-on-platform 60% |
| Pitney Bowes | 56.5 | 4 | 0 / 4 | 0 | 0 | 0 | standard 25%, covered 25%, builds-on-platform 50% |
| Anrok | 51.7 | 7 | 0 / 7 | 0 | 0 | 0 | standard 29%, builds-on-platform 71% |
| Kintsugi | 51.7 | 3 | 0 / 3 | 0 | 0 | 0 | builds-on-platform 100% |
| KPMG | 47.1 | 5 | 0 / 5 | 0 | 1 | 0 | builds-on-platform 80%, distribution 20% |
| Swap | 34.5 thin | 2 | 0 / 2 | 0 | 0 | 0 | builds-on-platform 100% |
| UniRate API | 33.9 | 6 | 0 / 6 | 0 | 1 | 2 | ipaas-bridge 33%, builds-on-platform 50%, distribution 17% |
| Quaderno | 29.2 | 42 | 0 / 42 | 0 | 0 | 33 | ipaas-bridge 87%, standard 3%, builds-on-platform 11% |
| TaxJar | 28.9 | 36 | 0 / 36 | 0 | 0 | 31 | ipaas-bridge 86%, standard 3%, builds-on-platform 11% |
| flatin.pt | 17.2 thin | 1 | 0 / 1 | 0 | 0 | 0 | builds-on-platform 100% |
| FlowAccount | 17.2 thin | 1 | 0 / 1 | 0 | 0 | 0 | builds-on-platform 100% |
| Zoho Books | 11.0 | 37 | 0 / 37 | 0 | 0 | 35 | ipaas-bridge 97%, builds-on-platform 3% |
covered 1 · reached mainly through aggregators
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| inFakt | 12.1 thin | 2 | 0 / 2 | 0 | 0 | 1 | ipaas-bridge 50%, covered 50% |
standard 23 · listed by a voluntary standard's own directory
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| Agicap | 64.5 | 3 | 0 / 3 | 0 | 0 | 0 | standard 67%, builds-on-platform 33% |
| Fonoa | 64.5 | 3 | 0 / 3 | 0 | 0 | 0 | standard 100% |
| Spendesk | 57.5 | 5 | 0 / 5 | 0 | 0 | 0 | standard 60%, builds-on-platform 40% |
| Sphere | 54.1 | 4 | 0 / 4 | 0 | 0 | 0 | standard 50%, builds-on-platform 50% |
| Avalara | 53.7 | 26 | 0 / 26 | 0 | 6 | 1 | ipaas-bridge 7%, standard 27%, builds-on-platform 27%, distribution 40% |
| Basware | 53.6 | 3 | 0 / 3 | 0 | 1 | 0 | standard 67%, distribution 33% |
| Axway | 53.4 | 11 | 0 / 11 | 0 | 2 | 0 | standard 73%, builds-on-platform 9%, distribution 18% |
| Sage | 52.5 | 5 | 0 / 5 | 0 | 0 | 1 | ipaas-bridge 20%, standard 60%, builds-on-platform 20% |
| Tradeshift | 50.2 | 5 | 0 / 5 | 0 | 2 | 0 | standard 40%, builds-on-platform 20%, distribution 40% |
| TietoEVRY | 48.3 | 3 | 0 / 3 | 0 | 1 | 0 | standard 67%, distribution 33% |
| Dext | 47.9 | 4 | 0 / 4 | 0 | 0 | 1 | ipaas-bridge 25%, standard 50%, builds-on-platform 25% |
| SEEBURGER | 47.2 thin | 2 | 0 / 2 | 0 | 0 | 0 | standard 100% |
| Klippa | 40.9 thin | 2 | 0 / 2 | 0 | 0 | 0 | standard 50%, builds-on-platform 50% |
| payflows | 40.9 thin | 2 | 0 / 2 | 0 | 0 | 0 | standard 50%, builds-on-platform 50% |
| Proactis | 39.6 | 3 | 0 / 3 | 0 | 2 | 0 | standard 33%, distribution 67% |
| DDD Invoices | 37.7 thin | 2 | 0 / 2 | 0 | 0 | 0 | standard 50%, builds-on-platform 50% |
| Visma | 34.4 | 4 | 0 / 4 | 0 | 0 | 2 | ipaas-bridge 50%, standard 50% |
| Fortnox | 25.4 | 6 | 0 / 6 | 0 | 0 | 4 | ipaas-bridge 67%, standard 17%, builds-on-platform 17% |
| Teamleader | 25.4 | 3 | 0 / 3 | 0 | 0 | 2 | ipaas-bridge 67%, standard 33% |
| OpenEnvoy | 23.6 thin | 1 | 0 / 1 | 0 | 0 | 0 | standard 100% |
| Billtrust | 20.4 thin | 1 | 0 / 1 | 0 | 0 | 0 | standard 100% |
| HMRC UK Tax Authority | 17.2 thin | 1 | 0 / 1 | 0 | 0 | 0 | standard 100% |
| Deskera | 11.1 | 32 | 0 / 32 | 0 | 0 | 31 | ipaas-bridge 97%, standard 3% |
mixed 5 · no single mode dominates
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| SAP | 67.5 | 29 | 0 / 29 | 0 | 1 | 2 | ipaas-bridge 6%, contract 3%, standard 45%, covered 3%, builds-on-platform 39%, distribution 3% |
| Odoo | 58.9 | 52 | 0 / 52 | 0 | 0 | 34 | ipaas-bridge 68%, contract 4%, standard 14%, builds-on-platform 14% |
| Intuit | 57.0 | 11 | 0 / 11 | 0 | 0 | 0 | contract 18%, standard 36%, builds-on-platform 45% |
| HighRadius | 52.4 | 3 | 0 / 3 | 0 | 1 | 0 | contract 33%, standard 33%, distribution 33% |
| Wingspan | 46.0 | 3 | 0 / 3 | 0 | 1 | 0 | contract 33%, standard 33%, distribution 33% |
list 2 · a long list on its own page, mostly unevidenced
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| Qonto | 44.2 | 18 | 0 / 18 | 0 | 0 | 2 | own-page 61%, ipaas-bridge 11%, contract 6%, standard 11%, covered 6%, builds-on-platform 6% |
| Pennylane | 29.9 | 302 | 0 / 302 | 0 | 0 | 2 | own-page 98%, ipaas-bridge 1%, standard 1%, builds-on-platform 1% |
long-tail 2 · reached only through iPaaS bridges
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| Contalink | 2.5 thin | 1 | 0 / 1 | 0 | 0 | 1 | ipaas-bridge 100% |
| MileIQ | 2.5 thin | 1 | 0 / 1 | 0 | 0 | 1 | ipaas-bridge 100% |
undeclared 9 · declares nothing we can read: no number
| Provider | Depth | Integrations | In / out | Unknown builder | Distribution | iPaaS bridge | Mix |
|---|---|---|---|---|---|---|---|
| Aibidia | undeclared | - | - | - | - | - | |
| Cadana | undeclared | - | - | - | - | - | |
| Co-Legal | undeclared | - | - | - | - | - | |
| OptionsAhoy | undeclared | - | - | - | - | - | |
| TaxBit | undeclared | - | - | - | - | - | |
| Vatstack | undeclared | - | - | - | - | - | |
| Vayana Network | undeclared | - | - | - | - | - | |
| Workday Payroll | undeclared | - | - | - | - | - | |
| ZenLedger | undeclared | - | - | - | - | - |
Top workflows by market votes
Workflows (Arazzo) and their phrasing are generated by API Evangelist, ranked by market votes (integration edges in the graph, weighted by channel).
In-market workflows only: a step on the market provider's side maps to this market's business capabilities (), and the partner is not a generic export/notify app. Other workflows are counted as bridges (including any whose steps do not resolve to a capability yet). Methodology. In-market: 5; bridges: 0.
| Workflow | Between | Votes | Weighted | Arazzo |
|---|---|---|---|---|
| Calculate Avalara tax on Stripe Checkout sessions Before creating a Stripe Checkout Session, call AvaTax createTransaction to compute the correct tax line and attach it to the session totals. |
Avalara ↔ Stripe | 2 | 1.0 | workflow generated by API Evangelist |
| Google Drive |
Qonto ↔ Google Drive | 1 | 0.0 | workflow generated by API Evangelist |
| Google Sheets |
Qonto ↔ Google Sheets | 1 | 0.0 | workflow generated by API Evangelist |
| Make |
Qonto ↔ Make | 1 | 0.0 | workflow generated by API Evangelist |
| Notion |
Qonto ↔ Notion | 1 | 0.0 | workflow generated by API Evangelist |
Generated 2026-10-24 from API Evangelist's own files; nothing on this page is a model's judgement. Provisional and unweighted; not part of the Kin Score composite or agent readiness. Read the Market layer methodology. Disagree with an edge? Every edge cites its evidence and can be corrected through the normal correction path.