Compare / Providers / SendGrid vs Mailgun

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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

85.9/100
exemplar
Agent readiness 45.5 · agent-ready
63 APIs · 14 artifact types
Best overall Cheapest entry
VS

Mailgun

30.9/100
thin
Agent readiness 19 · agent-aware
8 APIs · 8 artifact types

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.

FacetSendGridMailgunLeader
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 Score85.930.9SendGrid
Agent readiness45.5 agent-ready19 agent-awareSendGrid

Artifact coverage

Every artifact type either provider publishes, from the tool's artifact_matrix. Differences are listed first.

ArtifactSendGridMailgun
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.

SendGridMailgun
Audiencebusiness-product—
Pricing basistiered-subscription—
Deliverymanaged—
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.

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