Transactional Email
Providers using this tag (40)
Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.
Exemplar 18 Complete, well-documented, and agent-ready
Strong 11 Solid coverage with minor gaps
APIs with this tag (10)
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 3 Complete, well-documented, and agent-ready
Strong 3 Solid coverage with minor gaps
Developing 4 Usable, with meaningful gaps to close
Companies reaching this through an API (5)
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 40 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 |
|---|---|---|---|---|
| Access Clarity | 71.2 | 30 | +41.2 | 40 |
| Operational Transparency | 53.8 | 13.2 | +40.6 | 40 |
| Contract Quality | 58.8 | 18.6 | +40.2 | 40 |
| Developer Ergonomics | 64 | 24.5 | +39.5 | 40 |
| Discoverability | 74.5 | 59.1 | +15.4 | 40 |
| Contract Governance | 23.5 | 9.7 | +13.8 | 40 |
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) | 48% | 18% | +30 |
| MCP server (first-party) | 53% | 16% | +37 |
| Agent Skills | 0% | 0% | 0 |
| OAuth scopes | 35% | 13% | +22 |
| Security | 98% | 99% | -1 |
| Arazzo workflows | 5% | 1% | +4 |
| Governance rules | 95% | 36% | +59 |
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 AhaSend 90.5
- 2 Customer.io 85.9
- 3 SendGrid 84
- 4 Amazon SES 83.8
- 5 Brevo 81.3
- 6 Mailchimp 77.7
- 7 Paubox 75.4
- 8 Loops 75.1
- 9 Plunk 75
- 10 GetResponse 74.7
- 1 Customer.io 69.9
- 2 Loops 69
- 3 Paubox 60.9
- 4 AhaSend 58.7
- 5 agentisend-com 58
- 6 Brevo 57.2
- 7 MailerSend 56.3
- 8 MailerLite 55.3
- 9 sendly-now 55.3
- 10 SendPulse 54.5
Work with this as data
Every tag here is available over the APIs.io API and to AI agents over MCP.