Cherami

Cherami (cherami.to) is email infrastructure for AI agents: it gives an AI agent its own email address so it can receive messages and reply on threads. Developers build with the Cherami HTTP API (with a public OpenAPI contract), TypeScript and Python SDKs and signed webhooks, or connect an agent to Cherami's hosted MCP server or plugin. The service covers inboxes, messages, threads, labels, attachments, search, and sending/receiving rules, and is currently free.

Cherami publishes 10 API contracts indexed on the APIs.io network, including Access API, Drafts API, Feedback API, and 7 more. Tagged areas include Company, Email, AI Agents, MCP, and Webhook.

The Cherami catalog on APIs.io includes 1 JSON-LD context and 1 Spectral governance ruleset.

Cherami’s developer surface includes authentication, documentation, API reference, getting-started guide, engineering blog, pricing, support, and 33 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

58.4/100 strong Agent 57/100 agent native Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreeSelf serve⚡ Free to try

1 published contract 1 MCP Servers 5 Agent Skills

Company Email AI Agents MCP Webhook Messaging Email API

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 58.4/100 · strong

Contract Quality 13.0 / 19

Developer Ergonomics 8.5 / 15

Access Clarity 8.0 / 15

Operational Transparency 3.2 / 10

Contract Governance 3.2 / 9

Discoverability 4.9 / 8

Regulatory Posture 4.3 / 15

Create-or-Update Ergonomics 2.8 / 10

Agent readiness — 57/100 · agent native

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 5 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 6 / 6

Protected Resource Metadata 5 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 75 points between them, because the conditional facet above carries the other 25. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 75% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →
Documented Reversibility +6 pts — a reversal operation in the contract, graded up when a window is documented too Ask about this →
Agentic Commerce Well-Known Document +5 pts — a parsing /.well-known/ucp.json or acp.json declaring a version and at least one service, OR (0.27) a live x402 payment challenge from _data/x402-adoption.json — `self` when its endpoints are on the provider's own domain, `platform` when they are on a vendor's Ask about this →
Dry-Run / Simulate Mode +4 pts — OpenAPI: destructive operations expose a dry_run / simulate / preview / validate_only parameter Ask about this →

2 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 53.2 — up to +9.4 composite points Ask about this →
Operational Transparency scores 33.3 — up to +8.7 composite points Ask about this →
Developer Ergonomics scores 56.5 — up to +8.7 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

Not sure how this applies to your stack? Ask about any one item. Kin Lane reads every question, looks at your profile and your situation, and replies with what a fix would take — scoped to that one area, priced up front, yours whether you ship it or not. Ask a question →

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/cherami-to/apis.yml: open an issue on github.com/api-evangelist/cherami-to to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Standards implemented 4

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

OpenAPI

measured — observed by APIs.io (published)

OAuth 2.0

measured — observed by APIs.io (declared)

APIs 10

Individual APIs this provider publishes, each with its own machine-readable definition.

Cherami Access API

The access API from Cherami — 2 operation(s) for access.

Cherami Drafts API

The drafts API from Cherami — 3 operation(s) for drafts.

Cherami Feedback API

The feedback API from Cherami — 1 operation(s) for feedback.

Cherami Inboxes API

The inboxes API from Cherami — 4 operation(s) for inboxes.

Cherami Labels API

The labels API from Cherami — 5 operation(s) for labels.

Cherami Messages API

The messages API from Cherami — 5 operation(s) for messages.

Cherami Sending API

The sending API from Cherami — 6 operation(s) for sending.

Cherami Threads API

The threads API from Cherami — 2 operation(s) for threads.

Cherami Trash API

The trash API from Cherami — 3 operation(s) for trash.

Cherami Webhooks API

The webhooks API from Cherami — 8 operation(s) for webhooks.

Scroll for all 10

MCP Servers 1

Model Context Protocol servers that expose these APIs to AI agents.

Cherami MCP server

Remote MCP server at cherami.to over streamable HTTP requiring OAuth; 42 tools listed.

Plan details, limits and sources →

Rate limits

Signup discovery: 10 requests per IP per hour.
Agent approvals in Account: 10 per IP per 15 minutes.
Phrase redemption: 10 attempts per IP per 15 minutes.

All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

Cherami Plans Pricing

2 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Cherami Rate Limits

5 limits

RATE LIMITS

Terms of Service 1

What its API terms permit and prohibit, quoted from its own page.

Cherami

12 quoted statements, read from Cherami's own page on 2026-11-09.

TERMS

Privacy & Data 1

Its role, the data it processes, retention and transfers, quoted from its own privacy page.

Cherami

24 quoted statements, read from Cherami's own page on 2026-11-09.

PRIVACY

Eligibility 1

Who may sign up and where, quoted from its own terms.

Cherami

3 quoted statements, read from Cherami's own page on 2026-11-09.

ELIGIBILITY

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Cherami To Context

67 classes · 127 properties

JSON-LD

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

Cherami API Rules

68 rules · 57 error-severity 7 warn-severity 4 info-severity

SPECTRAL

OpenAPI Overlays 1

Overlays applied on top of this provider's contracts. Each card says who wrote it: a document the provider publishes, or one API Evangelist derived or generated.

Cherami Agent Overlay

50 actions · update · cherami-to-openapi.yml

DERIVED

12 properties

JSON SCHEMA

Scroll for all 28

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Cherami Authentication

http/oauth2 · 2 schemes

SECURITY

Cherami Domain Security

TLSv1.3 · DMARC

SECURITY

Scopes 1

OAuth scopes governing access to this provider's APIs.

Cherami Scopes

1 scope

1 scopes

SCOPES

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

Cherami Agentic Access

54 operations · 28 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted

GettingStarted

Documentation 2

Reference material describing how the API behaves

Documentation

Documentation

APIReference

APIReference

Agent Surfaces 5

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgentSkill

LLMsTxt

MCPServer

WellKnown

Design & Contract 10

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

Idempotency

Conventions

Lifecycle

ErrorCatalog

ErrorCatalog

Conformance

Scroll for all 10

Build 5

SDKs, sample code, and the tooling you integrate with

ToolCrosswalk

IntegrationEdges

SDKs

Packages

GitHubOrganization

GitHubOrganization

Access & Security 3

Authentication, authorization, and security posture

OAuthScopes

OAuthScopes

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 5

Pricing, plans, and the legal terms of use

Plans

Pricing

TermsOfService

PrivacyPolicy

UsageTerms

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 5

Properties that don't map to a standard resource type

Overlay

Hosts

Vendors

DataProcessing

Eligibility

Source (apis.yml)

aid: cherami-to
name: Cherami
description: 'Cherami (cherami.to) is email infrastructure for AI agents: it gives an AI agent its own email address so it
  can receive messages and reply on threads. Developers build with the Cherami HTTP API (with a public OpenAPI contract),
  TypeScript and Python SDKs and signed webhooks, or connect an agent to Cherami''s hosted MCP server or plugin. The service
  covers inboxes, messages, threads, labels, attachments, search, and sending/receiving rules, and is currently free.'
url: https://artifacts.apis.io/cherami-to/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-03 (modular-v1; was harvest)
accessModel:
  pricing: free
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Free · Self-serve signup
  confidence: high
  probe_state: covered
  source:
  - plans
  - authentication
  - scopes
  - rate-limits
  - security
  generated: '2026-11-13'
  method: derived
specificationVersion: '0.20'
created: '2026-11-03'
modified: '2026-11-03'
tags:
- Company
- Email
- AI Agents
- MCP
- Webhook
- Messaging
- Email API
tags_raw:
- Company
- Email
- AI Agents
- MCP
- Webhooks
- Messaging
- Email API
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
image: https://cherami.to/apple-icon.png
common:
- type: AgenticAccess
  url: agentic-access/cherami-to-agentic-access.yml
- type: RateLimits
  url: rate-limits/cherami-to-rate-limits.yml
- type: Plans
  url: plans/cherami-to-plans-pricing.yml
- type: Spectral
  url: rules/cherami-to-rules.yml
- type: JSONLD
  url: json-ld/cherami-to-context.jsonld
- type: Vocabulary
  url: vocabulary/cherami-to-vocabulary.yml
- type: AgentSkill
  url: skills/_index.yml
- type: DataModel
  url: data-model/cherami-to-data-model.yml
- type: Idempotency
  url: conventions/cherami-to-conventions.yml
- type: Conventions
  url: conventions/cherami-to-conventions.yml
- type: OAuthScopes
  url: scopes/cherami-to-scopes.yml
- type: Lifecycle
  url: lifecycle/cherami-to-lifecycle.yml
- type: ErrorCatalog
  url: errors/cherami-to-error-codes.yml
- type: ErrorCatalog
  url: errors/cherami-to-problem-types.yml
- type: Conformance
  url: conformance/cherami-to-conformance.yml
- type: Overlay
  url: overlays/cherami-to-agent-overlay.yaml
- type: LLMsTxt
  url: llms/cherami-to-llms.txt
- type: ToolCrosswalk
  url: mcp/cherami-to-tool-crosswalk.yml
- type: MCPServer
  url: mcp/cherami-to-mcp.yml
- type: WellKnown
  url: well-known/cherami-to-well-known.yml
- type: Hosts
  url: hosts/cherami-to-hosts.yml
- type: IntegrationEdges
  url: integrations/cherami-to-integration-edges.yml
- type: Vendors
  url: vendors/cherami-to-vendors.yml
- type: SDKs
  url: packages/cherami-to-packages.yml
- type: Packages
  url: packages/cherami-to-packages.yml
- type: Authentication
  url: authentication/cherami-to-authentication.yml
- type: DomainSecurity
  url: security/cherami-to-domain-security.yml
- type: Website
  url: https://cherami.to/
- type: Documentation
  url: https://cherami.to/docs
- type: APIReference
  url: https://cherami.to/docs/api
- type: GettingStarted
  url: https://cherami.to/docs/quickstart
- type: Blog
  url: https://cherami.to/blog
- type: Pricing
  url: https://cherami.to/pricing
- type: Support
  url: https://cherami.to/support
- type: GitHubOrganization
  url: https://github.com/cherami-mail
- type: TermsOfService
  url: https://cherami.to/terms
- type: PrivacyPolicy
  url: https://cherami.to/privacy
- type: UsageTerms
  url: terms/cherami-to-terms-of-service.yml
- type: DataProcessing
  url: privacy/cherami-to-privacy-policy.yml
- type: Eligibility
  url: eligibility/cherami-to-eligibility.yml
apis:
- aid: cherami-to:cherami-to-access-api
  name: Cherami Access API
  description: The access API from Cherami — 2 operation(s) for access.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Access
  tags_raw:
  - access
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-access-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-claim-input-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-claim-result-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-signup-result-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-signup-input-schema.json
- aid: cherami-to:cherami-to-drafts-api
  name: Cherami Drafts API
  description: The drafts API from Cherami — 3 operation(s) for drafts.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Drafts
  tags_raw:
  - drafts
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-drafts-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-create-draft-schema.json
- aid: cherami-to:cherami-to-feedback-api
  name: Cherami Feedback API
  description: The feedback API from Cherami — 1 operation(s) for feedback.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Feedback
  tags_raw:
  - feedback
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-feedback-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-feedback-input-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-feedback-result-schema.json
- aid: cherami-to:cherami-to-inboxes-api
  name: Cherami Inboxes API
  description: The inboxes API from Cherami — 4 operation(s) for inboxes.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Inboxes
  tags_raw:
  - inboxes
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-inboxes-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-create-inbox-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-created-inbox-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-update-inbox-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-inbox-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-policy-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-inbox-list-schema.json
- aid: cherami-to:cherami-to-labels-api
  name: Cherami Labels API
  description: The labels API from Cherami — 5 operation(s) for labels.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Labels
  tags_raw:
  - labels
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-labels-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-bulk-label-change-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-label-change-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-label-list-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-label-result-schema.json
- aid: cherami-to:cherami-to-messages-api
  name: Cherami Messages API
  description: The messages API from Cherami — 5 operation(s) for messages.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Message
  tags_raw:
  - messages
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-messages-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-received-detail-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-received-summary-schema.json
- aid: cherami-to:cherami-to-sending-api
  name: Cherami Sending API
  description: The sending API from Cherami — 6 operation(s) for sending.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Sending
  tags_raw:
  - sending
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-sending-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-send-input-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-sent-detail-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-sent-summary-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-forward-input-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-quota-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-reply-input-schema.json
- aid: cherami-to:cherami-to-threads-api
  name: Cherami Threads API
  description: The threads API from Cherami — 2 operation(s) for threads.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Threads
  tags_raw:
  - threads
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-threads-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-received-detail-schema.json
- aid: cherami-to:cherami-to-trash-api
  name: Cherami Trash API
  description: The trash API from Cherami — 3 operation(s) for trash.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Trash
  tags_raw:
  - trash
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-trash-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-trash-entry-schema.json
- aid: cherami-to:cherami-to-webhooks-api
  name: Cherami Webhooks API
  description: The webhooks API from Cherami — 8 operation(s) for webhooks.
  humanURL: https://cherami.to/docs/api
  baseURL: https://cherami.to
  tags:
  - Webhook
  tags_raw:
  - webhooks
  properties:
  - type: OpenAPI
    url: openapi/cherami-to-webhooks-api-openapi.yml
  - type: Documentation
    url: https://cherami.to/docs/api
  - type: JSONSchema
    url: json-schema/cherami-to-created-webhook-schema.json
  - type: JSONSchema
    url: json-schema/cherami-to-webhook-schema.json
x-coverage:
  state: covered
  reason: identity-verified
  detail: Identity verified from the cherami.to homepage title "Cherami · Email infrastructure for AI agents" and site links;
    all pointers fetched 200.
  evidence:
  - url: https://cherami.to/
    status: 200
  - url: https://cherami.to/docs
    status: 200
  - url: https://cherami.to/docs/api
    status: 200
  - url: https://cherami.to/docs/quickstart
    status: 200
  - url: https://cherami.to/blog
    status: 200
  - url: https://cherami.to/pricing
    status: 200
  - url: https://cherami.to/support
    status: 200
  - url: https://github.com/cherami-mail
    status: 200
  - url: https://cherami.to/terms
    status: 200
  - url: https://cherami.to/privacy
    status: 200
  - url: https://cherami.to/apple-icon.png
    status: 200
x-enrichment:
  date: '2026-11-03'
  status: enriched
  artifacts_added: 45
  pass: modular-v1
  engine: identity=anthropic,contract=anthropic,surfaces=anthropic,docs=anthropic,regulatory=anthropic

Cherami API — frequently asked questions

Does Cherami have an API?

Yes. APIs.io lists 10 APIs from Cherami, including Cherami Access API, Cherami Drafts API and Cherami Feedback API, and 7 more.

Is there an OpenAPI specification for the Cherami API?

Yes. APIs.io indexes 10 OpenAPI specifications for Cherami, each linked for download from this page.

How do I authenticate with the Cherami API?

Cherami documents its authentication (http/oauth2 · 2 schemes). The details are profiled on APIs.io as Cherami Authentication.

How much does the Cherami API cost?

Cherami publishes its prices; its Free plan is currently free. as of 2026-11-03. APIs.io lists 2 pricing plans for Cherami, with each plan's price, limits and inclusions under Pricing on this page.

Does Cherami have an MCP server?

Yes. APIs.io lists 1 MCP server for Cherami: Remote MCP server at cherami.to over streamable HTTP requiring OAuth; 42 tools listed.

Is the Cherami API ready for AI agents?

Cherami has a Kin Score of 58.4 out of 100 (strong) and an Agent Readiness score of 56.7 (agent-native), scored by API Evangelist on 2026-11-13.

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curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/cherami-to/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/cherami-to/evidence"

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