Truth Systems

Truth Systems builds AI governance and hallucination-detection infrastructure for regulated industries, with a focus on legal firms. Gateway, its core API product, fact-checks LLM-generated text against customer source documents in real time - decomposing a claim into statements, retrieving evidence, and returning SUPPORTS / REFUTES / NOT_ENOUGH_INFO verdicts with character-level evidence spans. Gateway deploys into the customer's own AWS or Azure account via Terraform, with a Python SDK. The company also offers Charter (AI governance for human users) and Alexandria (agent-focused governance), and is backed by Lightspeed Venture Partners.

Truth Systems publishes 1 API on the APIs.io network: Get Context Output API. Tagged areas include Company, Artificial Intelligence, AI Governance, Hallucination Detection, and Fact Checking.

Truth Systems’ developer surface includes developer portal, documentation, support, authentication, and 13 more developer resources.

🌐 Visit website 📡 Source on GitHub

32.4/100 thin ▬ flat Agent 28/100 agent aware Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

1 APIs 1 MCP Servers

Company Artificial Intelligence AI Governance Hallucination Detection Fact Checking Compliance Legal

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 32.4/100 · thin

Contract Quality 10.7 / 23

Developer Ergonomics 11.5 / 18

Access Clarity 0.0 / 18

Operational Transparency 0.3 / 12

Contract Governance 0.5 / 11

Discoverability 6.8 / 9

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 28/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 12 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 8 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 0 / 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 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

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.

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 github.com/api-evangelist/truth-systems: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 1

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

Truth Systems Get Context Output API

The Get Context Output API from Truth Systems — 1 operation(s) for get context output.

Open Collections 2

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Gateway Get Context Output API

OPEN COLLECTION

MCP Servers 1

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

Truth Systems Docs

Truth Systems operates a hosted, remote MCP server on its documentation site (Mintlify-hosted, streamable HTTP). The server is read-only and scoped to the Truth Systems Docs con...

MCP SERVER

Security Posture 2

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

Truth Systems Authentication

aws-iam/apiKey · 2 schemes

SECURITY

Truth Systems Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Resources

Get Started 1

Portal, sign-up, and the first successful call

Portal

Portal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 3

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

MCPServer

MCPServer

AgentSkill

AgentSkill

Design & Contract 4

Pagination, idempotency, versioning, errors, and events

Conventions

ErrorCatalog

Conformance

DataModel

Build 3

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Packages

Packages

SDKs

SDKs

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 1

Status, limits, changes, and where to get help

Support

Support

Company 1

The organization behind the API

Website

Website

Other 1

Properties that don't map to a standard resource type

Overlay

Overlay

Source (apis.yml)

aid: truth-systems
name: Truth Systems
description: Truth Systems builds AI governance and hallucination-detection infrastructure for regulated industries, with
  a focus on legal firms. Gateway, its core API product, fact-checks LLM-generated text against customer source documents
  in real time - decomposing a claim into statements, retrieving evidence, and returning SUPPORTS / REFUTES / NOT_ENOUGH_INFO
  verdicts with character-level evidence spans. Gateway deploys into the customer's own AWS or Azure account via Terraform,
  with a Python SDK. The company also offers Charter (AI governance for human users) and Alexandria (agent-focused governance),
  and is backed by Lightspeed Venture Partners.
url: https://raw.githubusercontent.com/api-evangelist/truth-systems/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- lightspeed-venture-partners
x-tier: stub
x-tier-reason: portfolio-lead
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source:
  - authentication
  - security
  generated: '2026-09-03'
  method: derived
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
image: https://www.truthsystems.ai/truthsystems-logo.svg
tags:
- Company
- Artificial Intelligence
- AI Governance
- Hallucination Detection
- Fact Checking
- Compliance
- Legal
apis:
- aid: truth-systems:truth-systems-get-context-output-api
  name: Truth Systems Get Context Output API
  description: The Get Context Output API from Truth Systems — 1 operation(s) for get context output.
  humanURL: https://docs.truthsystems.ai/introduction
  baseURL: https://www.truthsystems.ai
  tags:
  - Get Context Output
  properties:
  - type: OpenAPI
    url: openapi/truth-systems-get-context-output-api-openapi.yml
  - type: Documentation
    url: https://docs.truthsystems.ai/introduction
  - type: APIReference
    url: https://docs.truthsystems.ai/api-reference/openapi.json
  - type: GettingStarted
    url: https://docs.truthsystems.ai/sdk/installation
  - type: Examples
    url: examples/truth-systems-gateway-examples.yml
common:
- type: Overlay
  url: overlays/truth-systems-gateway-overlay.yaml
- type: DomainSecurity
  url: security/truth-systems-domain-security.yml
- type: Website
  url: https://www.truthsystems.ai
- type: Portal
  url: https://docs.truthsystems.ai
- type: Documentation
  url: https://docs.truthsystems.ai/introduction
- type: GitHubOrganization
  url: https://github.com/TruthSystems
- type: Support
  url: mailto:info@truthsystems.com
- type: LLMsTxt
  url: llms/truth-systems-llms.txt
- type: MCPServer
  url: mcp/truth-systems-mcp.yml
- type: Packages
  url: packages/truth-systems-packages.yml
- type: SDKs
  url: packages/truth-systems-packages.yml
- type: Authentication
  url: authentication/truth-systems-authentication.yml
- type: Conventions
  url: conventions/truth-systems-conventions.yml
- type: ErrorCatalog
  url: errors/truth-systems-problem-types.yml
- type: Conformance
  url: conformance/truth-systems-conformance.yml
- type: DataModel
  url: data-model/truth-systems-data-model.yml
- type: AgentSkill
  url: skills/_index.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-21'
  status: enriched
  artifacts_added: 15
  pass: local-v1

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