Payment Processing
Providers using this tag (75)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Strong 6 Solid coverage with minor gaps
Developing 30 Usable, with meaningful gaps to close
Thin 18 Limited public surface area
Emerging 9 Early or largely undocumented
Minimal 8 Almost no public developer surface
APIs with this tag (8)
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 →
Strong 1 Solid coverage with minor gaps
Developing 4 Usable, with meaningful gaps to close
Emerging 3 Early or largely undocumented
Companies reaching this through an API (2)
These companies publish an API, specification or operation carrying “Payment Processing” 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
Where this tag sits
75 providers carry this tag directly, and 158 counting the 5 narrower tags below — 83 more to reach.
Related tags
Where this tag comes from
Markets provisional
Kin Score markets whose measured providers carry this tag. Share is the fraction of the market's measured providers that carry it — it describes the market, not this tag.
| Market | Share of the market's providers |
|---|---|
| EMV Card Terminals (card acceptance hardware and kernels) | 37% |
Cohort brief
Auto-generatedThe 74 providers in the APIs.io catalog tagged Payment Processing, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Contract Quality | 41 | 17.2 | +23.8 | 74 |
| Developer Ergonomics | 45.7 | 23.2 | +22.5 | 74 |
| Operational Transparency | 28.3 | 13 | +15.3 | 74 |
| Discoverability | 65.9 | 57.9 | +8 | 74 |
| Access Clarity | 31.4 | 23.9 | +7.5 | 74 |
| Contract Governance | 12.1 | 6.5 | +5.6 | 74 |
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.
| Artifact | This cohort | Catalog | Difference |
|---|---|---|---|
| MCP server (any) | 27% | 13% | +14 |
| MCP server (first-party) | 24% | 12% | +12 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 24% | 11% | +13 |
| Security | 100% | 98% | +2 |
| Arazzo workflows | 9% | 2% | +7 |
| Governance rules | 28% | 16% | +12 |
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.
- 1 Stripe 81.1
- 2 Square 78.1
- 3 Stax 72.5
- 4 Adyen 71.1
- 5 Finix 61.9
- 6 Mollie 59.6
- 7 Payabli 56.8
- 8 Zai 56.4
- 9 Paymentsense 55.1
- 10 Rainforest 54.4
Coverage caveat. 63 of 74 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 24 October 2026, across 31984 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.