Lettria

Lettria provides advanced natural language processing APIs that extract semantic information from French text. Their services include entity extraction, sentiment analysis, relationship detection, and text classification, enabling developers to build intelligent applications such as chatbots, content moderation tools, and data analytics platforms. Lettria’s platform is designed for scalability and offers both RESTful endpoints and SDKs for multiple programming languages, supporting high-volume processing with robust performance and compliance with data privacy standards.

Lettria is profiled on the APIs.io network. Tagged areas include Company, Natural Language Processing, Artificial Intelligence, Text Analysis, and French.

Lettria’s developer surface includes pricing, engineering blog, and 13 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

18.8/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemium

0 APIs

Company Natural Language Processing Artificial Intelligence Text Analysis French

Kin Score

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

Composite quality — 18.8/100 · emerging

Contract Quality 0.0 / 21

Developer Ergonomics 1.6 / 17

Access Clarity 9.4 / 17

Operational Transparency 1.0 / 11

Contract Governance 0.0 / 10

Discoverability 4.3 / 9

Regulatory Posture 1.9 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 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 0 / 6

Protected Resource Metadata 0 / 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 could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% 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):

Machine-Readable Contract +18 pts — api_specs includes an OpenAPI document Ask about this →
MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Agentic Access Contract +10 pts — agentic_access artifact present (x-agentic-access), graded by author Ask about this →
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey) Ask about this →
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented) Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →

13 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 0.0 — up to +25.0 composite points Ask about this →
Developer Ergonomics scores 9.5 — up to +18.1 composite points Ask about this →
Contract Governance scores 0.0 — up to +12.0 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/lettria/apis.yml: open an issue on github.com/api-evangelist/lettria 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 →

Lettria API pricing

Prices published by Lettria, read 2026-10-20 from www.lettria.com/pricing-lettria. A free plan or tier is listed.

Plan	Price
Developer Free	Free
Plus	0.01$ per PCU
Enterprise	Contact Sales

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Lettria Plans Pricing

3 plans

PLANS

Privacy & Data 1

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

Lettria

28 quoted statements, read from Lettria's own page on 2026-11-09.

PRIVACY

Security Posture 1

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

Lettria Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Build 2

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

Access & Security 2

Authentication, authorization, and security posture

Security

Security

DomainSecurity

DomainSecurity

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 2

The organization behind the API

Blog

Blog

Website

Website

Other 5

Properties that don't map to a standard resource type

Hosts

Vendors

Leadership

x-coverage

DataProcessing

Source (apis.yml)

aid: lettria
name: Lettria
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: low
  probe_state: none
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://cdn.prod.website-files.com/62e2b9ca46af9a61f6c19666/6a8db0c2a467ff2069fe16d4_Capture%20d%27%C3%A9cran%202026-08-25%20171137.png
description: Lettria provides advanced natural language processing APIs that extract semantic information from French text.
  Their services include entity extraction, sentiment analysis, relationship detection, and text classification, enabling
  developers to build intelligent applications such as chatbots, content moderation tools, and data analytics platforms. Lettria’s
  platform is designed for scalability and offers both RESTful endpoints and SDKs for multiple programming languages, supporting
  high-volume processing with robust performance and compliance with data privacy standards.
url: https://raw.githubusercontent.com/api-evangelist/lettria/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-20 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-10-20'
modified: '2026-10-20'
tags:
- Company
- Natural Language Processing
- Artificial Intelligence
- Text Analysis
- French
tags_raw:
- Company
- NLP
- AI
- TextAnalysis
- French
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Plans
  url: plans/lettria-plans-pricing.yml
- type: Hosts
  url: hosts/lettria-hosts.yml
- type: Vendors
  url: vendors/lettria-vendors.yml
- type: SDKs
  url: packages/lettria-packages.yml
- type: Packages
  url: packages/lettria-packages.yml
- type: TermsOfService
  url: https://www.lettria.com/terms-of-service
- type: Security
  url: https://www.lettria.com/security
- type: PrivacyPolicy
  url: https://www.lettria.com/privacy-policy
- type: Pricing
  url: https://www.lettria.com/pricing-lettria
- type: Leadership
  url: https://www.lettria.com/team
- type: Blog
  url: https://www.lettria.com/blog
- type: DomainSecurity
  url: security/lettria-domain-security.yml
- type: Website
  url: https://lettria.com/
- type: x-coverage
  state: unreadable
  reason: js-rendered-docs
  detail: Main website renders documentation via JavaScript, no machine‑readable spec found.
  evidence:
  - url: https://www.lettria.com
    status: 200
  checked: '2026-10-20'
  url: https://lettria.com/
- type: DataProcessing
  url: privacy/lettria-privacy-policy.yml
apis: []
x-coverage:
  state: none
  reason: no-developer-program
  method: derived
  generated: '2026-10-20'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company publishes no developer documentation host and no machine-readable contract on its own domain
  evidence:
  - url: https://lettria.com/
    status: 200
x-enrichment:
  date: '2026-10-20'
  status: enriched
  artifacts_added: 9
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Lettria API — frequently asked questions

How much does the Lettria API cost?

Lettria publishes its prices; its Plus plan is 0.01$ per PCU as of 2026-10-20. APIs.io lists 3 pricing plans for Lettria, with each plan's price, limits and inclusions under Pricing on this page.

Is the Lettria API ready for AI agents?

Lettria has a Kin Score of 18.8 out of 100 (emerging) and an Agent Readiness score of 0.0 (human-only), scored by API Evangelist on 2026-11-13.

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