compare_providers
SendGrid vs Mailgun: the email APIs, 55 points apart
SendGrid scores 85.9 (exemplar) against Mailgun's 30.9 (thin). The gap is contracts, not the email product.
SendGrid
This is the widest provider gap on the page. SendGrid is an exemplar at 85.9, Mailgun is thin at 30.9. Both are long-established transactional email APIs, so the gap does not mean Mailgun is a worse email service. It means the catalog can verify much less about Mailgun’s API.
Mailgun scores 0 on contract governance and 2.6 on operational transparency. SendGrid publishes rules, rate limits, plans, FinOps, OAuth scopes, an MCP server, Arazzo workflows and overlays that this comparison does not find for Mailgun. Mailgun publishes an AsyncAPI for its events, which SendGrid does not.
SendGrid is also the only one with a readable entry price, starting at $19.95 a month. Mailgun can close this gap without changing its product: claim the listing, point the catalog at the contracts, and the score follows the evidence.
Facet by facet
The six Kin Score facets, 0 to 100. The facet leader is the one the tool names in facet_leaders. Each facet links to how it is measured.
| Facet | SendGrid | Mailgun | Leader |
|---|---|---|---|
| Discoverability | 82.1 | 66.1 | SendGrid |
| Contract Quality | 77.4 | 45.9 | SendGrid |
| Contract Governance | 35.6 | 0 | SendGrid |
| Operational Transparency | 60.5 | 2.6 | SendGrid |
| Developer Ergonomics | 89.3 | 33.3 | SendGrid |
| Access Clarity | 92.1 | 31.6 | SendGrid |
| Kin Score | 85.9 | 30.9 | SendGrid |
| Agent readiness | 45.5 agent-ready | 19 agent-aware | SendGrid |
Artifact coverage
Every artifact type either provider publishes, from the tool's artifact_matrix. Differences are listed first.
| Artifact | SendGrid | Mailgun |
|---|---|---|
| API Overview | — | ✓ |
| Arazzo | ✓ | — |
| AsyncAPI | — | ✓ |
| Authentication | — | ✓ |
| FinOps | ✓ | — |
| JSONSchema | ✓ | — |
| MCP | ✓ | — |
| Overlay | ✓ | — |
| Plans | ✓ | — |
| RateLimits | ✓ | — |
| Rules | ✓ | — |
| Scopes | ✓ | — |
| APIsJSON | ✓ | ✓ |
| AgenticAccess | ✓ | ✓ |
| Documentation | ✓ | ✓ |
| OpenAPI | ✓ | ✓ |
| Security | ✓ | ✓ |
What it costs to get in
Each provider's economics as the tool returns them. Grade A is quoted on the provider's own pricing page, B is arithmetic on quotes, C a stated prior. Entry cost is the cheapest published paid tier — a floor on getting in, not the price of the API alone. Grades: A quoted on the provider's page, B arithmetic on quotes, C a stated prior.
| SendGrid | Mailgun | |
|---|---|---|
| Audience | business-product | — |
| Pricing basis | tiered-subscription | — |
| Delivery | managed | — |
| Entry (per month) | starting at $19.95/mo grade A · Essentials | not published |
| Marginal cost | — | — |
| Take rate | — | — |
| Source | pricing page read 2026-10-12 | — |
Cheapest published way in: SendGrid. Priced 1 of 2.
The full compare_providers response
{"providers":[{"slug":"sendgrid","name":"SendGrid","band":"exemplar","composite":85.9,"trend":"flat","delta":0,"api_count":63,"api_count_basis":"split","artifact_types":["MCP","Security","Rules","Plans","RateLimits","FinOps","Scopes","AgenticAccess","Arazzo","Overlay","OpenAPI","Documentation","JSONSchema","APIsJSON"],"industries":["marketing-advertising"],"regions":[],"facets":{"discoverability":82.1,"contract_quality":77.4,"contract_governance":35.6,"operational_transparency":60.5,"developer_ergonomics":89.3,"access_clarity":92.1},"facet_gap":{"discoverability":0,"contract_quality":0,"contract_governance":0,"operational_transparency":0,"developer_ergonomics":0,"access_clarity":0},"agent_readiness":{"score":45.5,"band":"agent-ready"},"economics":{"audience":"business-product","pricing_basis":"tiered-subscription","delivery":"managed","entry_usd_month":{"usd":19.95,"grade":"A","plan":"Essentials","from":"starting at $19.95/mo","unit":null,"formula":null},"marginal_usd":null,"take_rate":null,"fetched":"2026-10-12","source":"https://www.twilio.com/en-us/products/email-api/pricing"}},{"slug":"mailgun","name":"Mailgun","band":"thin","composite":30.9,"trend":"flat","delta":0,"api_count":8,"api_count_basis":"split","artifact_types":["Security","AgenticAccess","OpenAPI","Documentation","API Overview","Authentication","AsyncAPI","APIsJSON"],"industries":["telecommunications"],"regions":[],"facets":{"discoverability":66.1,"contract_quality":45.9,"contract_governance":0,"operational_transparency":2.6,"developer_ergonomics":33.3,"access_clarity":31.6},"facet_gap":{"discoverability":16,"contract_quality":31.5,"contract_governance":35.6,"operational_transparency":57.9,"developer_ergonomics":56,"access_clarity":60.5},"agent_readiness":{"score":19,"band":"agent-aware"},"economics":null}],"artifact_union":["API Overview","APIsJSON","AgenticAccess","Arazzo","AsyncAPI","Authentication","Documentation","FinOps","JSONSchema","MCP","OpenAPI","Overlay","Plans","RateLimits","Rules","Scopes","Security"],"artifact_matrix":{"API Overview":{"sendgrid":false,"mailgun":true},"APIsJSON":{"sendgrid":true,"mailgun":true},"AgenticAccess":{"sendgrid":true,"mailgun":true},"Arazzo":{"sendgrid":true,"mailgun":false},"AsyncAPI":{"sendgrid":false,"mailgun":true},"Authentication":{"sendgrid":false,"mailgun":true},"Documentation":{"sendgrid":true,"mailgun":true},"FinOps":{"sendgrid":true,"mailgun":false},"JSONSchema":{"sendgrid":true,"mailgun":false},"MCP":{"sendgrid":true,"mailgun":false},"OpenAPI":{"sendgrid":true,"mailgun":true},"Overlay":{"sendgrid":true,"mailgun":false},"Plans":{"sendgrid":true,"mailgun":false},"RateLimits":{"sendgrid":true,"mailgun":false},"Rules":{"sendgrid":true,"mailgun":false},"Scopes":{"sendgrid":true,"mailgun":false},"Security":{"sendgrid":true,"mailgun":true}},"facet_leaders":{"discoverability":{"provider":"sendgrid","score":82.1},"contract_quality":{"provider":"sendgrid","score":77.4},"contract_governance":{"provider":"sendgrid","score":35.6},"operational_transparency":{"provider":"sendgrid","score":60.5},"developer_ergonomics":{"provider":"sendgrid","score":89.3},"access_clarity":{"provider":"sendgrid","score":92.1}},"best_overall":"sendgrid","cheapest_entry":"sendgrid","economics_basis":{"stamp_generated":"2026-10-17","priced":1,"of":2,"note":"Entry cost is the cheapest published paid tier — a floor on getting in, not the price of the API alone. Grades: A quoted on the provider's page, B arithmetic on quotes, C a stated prior."},"unknown":[]}
Result read 2026-10-27. Scores move as providers publish; run it yourself for today's numbers.
Run this comparison yourself
Everything above came from one call to compare_providers. Swap in any two of the catalog's providers (three or more works too) and you get the same answer for your own shortlist. It is an Understanding tool, included in the Understanding and Influence plans, or pay per call.
https://apis.io/mcp:
{"name": "compare_providers", "arguments": {"providers": ["sendgrid","mailgun"]}}
Over the REST API:
curl "https://apis.io/api/v1/compare?providers=sendgrid,mailgun" \
-H "X-API-Key: $APIS_IO_KEY"
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