Transactional Email
Providers using this tag (34)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 14 Complete, well-documented, and agent-ready
Strong 10 Solid coverage with minor gaps
Emerging 1 Early or largely undocumented
APIs with this tag (9)
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 2 Complete, well-documented, and agent-ready
Strong 4 Solid coverage with minor gaps
Developing 3 Usable, with meaningful gaps to close
Companies reaching this through an API (4)
These companies publish an API, specification or operation carrying “Transactional Email” 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
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 |
|---|---|
| Communications (CPaaS) | 36% |
Cohort brief
Auto-generatedThe 34 providers in the APIs.io catalog tagged Transactional Email, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.
| Facet | This cohort | Catalog | Difference | Scored |
|---|---|---|---|---|
| Operational Transparency | 57.5 | 13 | +44.5 | 34 |
| Access Clarity | 67.4 | 23.9 | +43.5 | 34 |
| Contract Quality | 57.9 | 17.2 | +40.7 | 34 |
| Developer Ergonomics | 63.7 | 23.2 | +40.5 | 34 |
| Discoverability | 73.4 | 57.9 | +15.5 | 34 |
| Contract Governance | 17 | 6.5 | +10.5 | 34 |
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) | 50% | 13% | +37 |
| MCP server (first-party) | 53% | 12% | +41 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 35% | 11% | +24 |
| Security | 97% | 98% | -1 |
| Arazzo workflows | 6% | 2% | +4 |
| Governance rules | 47% | 16% | +31 |
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 SendGrid 85.9
- 2 Customer.io 84.1
- 3 AhaSend 82.8
- 4 Brevo 80.8
- 5 Amazon SES 79
- 6 Paubox 77
- 7 Mailchimp 76.7
- 8 Plunk 73.6
- 9 GetResponse 72.1
- 10 Loops 70.1
- 1 Customer.io 69.9
- 2 Loops 62.2
- 3 Paubox 60.9
- 4 Brevo 57.2
- 5 MailerSend 56.3
- 6 SendPulse 51.7
- 7 Resend 49.4
- 8 GetResponse 48.9
- 9 AhaSend 47.8
- 10 SendGrid 45.5
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.