PromptLens

PromptLens provides a platform to catch AI regressions before production. It enables engineers to test prompts and model changes against real cases, preventing faulty outputs from reaching users. Features include versioned prompt testing, integration with major LLM providers, and detailed observability of prompt behavior across deployments.

PromptLens is listed with 1 API on the APIs.io network. Tagged areas include Company, Artificial Intelligence, Monitoring, Testing, and LLM.

The PromptLens catalog on APIs.io includes 1 event-driven AsyncAPI specification.

PromptLens’ developer surface includes authentication, signup flow, documentation, API reference, getting-started guide, pricing, support, and 23 more developer resources.

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44.5/100 developing ▲ 8.0 Agent 39/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 API

Company Artificial Intelligence Monitoring Testing LLM Observability

Kin Score

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

Composite quality — 44.5/100 · developing

Contract Quality 8.3 / 21

Developer Ergonomics 7.7 / 17

Access Clarity 12.3 / 17

Operational Transparency 1.3 / 11

Contract Governance 0.8 / 10

Discoverability 7.1 / 9

Regulatory Posture 2.6 / 15

Agent readiness — 39/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 6 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 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 6 / 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):

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 →
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 →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Rate-Limit Signaling +7 pts — OpenAPI responses document X-RateLimit-* / RateLimit headers (verified), else a rate_limits artifact or RateLimits link (documented) Ask about this →

6 more unmet checks in the Agent Readiness table above.

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

Contract Quality scores 39.0 — up to +15.3 composite points Ask about this →
Operational Transparency scores 11.9 — up to +11.5 composite points Ask about this →
Developer Ergonomics scores 45.2 — up to +11.0 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/promptlens/apis.yml: open an issue on github.com/api-evangelist/promptlens 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 2

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.

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

APIs 1

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

PromptLens API

PromptLens Product API providing prompt retrieval and management via OAuth.

PromptLens API pricing

Prices published by PromptLens, read 2026-10-18 from www.promptlens.io/pricing.

Plan	Price
Free	$0 per organization/ month
Pro	$99 per organization/ month
Teams	Custom

Plan details, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

PromptLens Plans Pricing

3 plans

PLANS

Terms of Service 1

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

PromptLens

8 quoted statements, read from PromptLens's own page on 2026-11-10.

TERMS

Privacy & Data 1

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

PromptLens

17 quoted statements, read from PromptLens's own page on 2026-11-10.

PRIVACY

Data License 1

How its data and outputs may be reused, quoted from its own terms.

PromptLens

1 quoted statement, read from PromptLens's own page on 2026-11-10.

LICENSE

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Promptlens Webhooks

ASYNCAPI

Security Posture 2

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

PromptLens Authentication

3 schemes

SECURITY

PromptLens Domain Security

TLSv1.3 · DMARC

SECURITY

Resources

Get Started 3

Portal, sign-up, and the first successful call

SignUp

SignUp

GettingStarted

GettingStarted

GettingStarted

GettingStarted

Documentation 4

Reference material describing how the API behaves

Documentation

APIReference

Documentation

APIReference

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

LLMsTxt

LLMsTxt

WellKnown

WellKnown

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

Vocabulary

Vocabulary

Webhooks

Webhooks

Conformance

Conformance

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

Authentication

Authentication

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

Support

Support

Support

Support

Commercial 9

Pricing, plans, and the legal terms of use

Plans

Pricing

PrivacyPolicy

TermsOfService

Pricing

PrivacyPolicy

TermsOfService

UsageTerms

DataLicense

Scroll for all 9

Company 1

The organization behind the API

Website

Website

Other 3

Properties that don't map to a standard resource type

Vendors

Vendors

Hosts

Hosts

DataProcessing

DataProcessing

Source (apis.yml)

aid: promptlens
name: PromptLens
description: PromptLens provides a platform to catch AI regressions before production. It enables engineers to test prompts
  and model changes against real cases, preventing faulty outputs from reaching users. Features include versioned prompt testing,
  integration with major LLM providers, and detailed observability of prompt behavior across deployments.
url: https://raw.githubusercontent.com/api-evangelist/promptlens/refs/heads/main/apis.yml
x-type: company
x-source: harvest:g2-catalog
x-tier: profiled
x-tier-reason: enrichment pass 2026-10-18 (modular-v1; was harvest)
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  probe_state: gated
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
specificationVersion: '0.20'
created: '2026-10-18'
modified: '2026-10-18'
tags:
- Company
- Artificial Intelligence
- Monitoring
- Testing
- LLM
- Observability
tags_raw:
- Company
- AI
- Monitoring
- Testing
- LLM
- Observability
image: https://www.promptlens.io/brand/logo-accent-black.svg
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: Vendors
  url: vendors/promptlens-vendors.yml
- type: Plans
  url: plans/promptlens-plans-pricing.yml
- type: Vocabulary
  url: vocabulary/promptlens-vocabulary.yml
- type: Webhooks
  url: asyncapi/promptlens-webhooks.yml
- type: Authentication
  url: authentication/promptlens-authentication.yml
- type: Conformance
  url: conformance/promptlens-conformance.yml
- type: LLMsTxt
  url: llms/promptlens-llms.txt
- type: WellKnown
  url: well-known/promptlens-well-known.yml
- type: Hosts
  url: hosts/promptlens-hosts.yml
- type: SignUp
  url: https://www.promptlens.io/auth/sign-up?redirect_url=/prompts/new
- type: GitHubOrganization
  url: https://github.com/promptlens-io
- type: DomainSecurity
  url: security/promptlens-domain-security.yml
- type: Website
  url: https://promptlens.io/
- type: Documentation
  url: https://www.promptlens.io/docs
- type: APIReference
  url: https://www.promptlens.io/docs/api-reference
- type: GettingStarted
  url: https://www.promptlens.io/docs/quickstart
- type: Pricing
  url: https://www.promptlens.io/pricing
- type: Support
  url: https://www.promptlens.io/contact
- type: PrivacyPolicy
  url: https://www.promptlens.io/privacy
- type: TermsOfService
  url: https://www.promptlens.io/terms
- type: Documentation
  url: https://www.promptlens.io/docs
- type: APIReference
  url: https://www.promptlens.io/docs/api-reference
- type: GettingStarted
  url: https://www.promptlens.io/docs/quickstart
- type: Pricing
  url: https://www.promptlens.io/pricing
- type: Support
  url: https://www.promptlens.io/contact
- type: PrivacyPolicy
  url: https://www.promptlens.io/privacy
- type: TermsOfService
  url: https://www.promptlens.io/terms
- type: UsageTerms
  url: terms/promptlens-terms-of-service.yml
- type: DataProcessing
  url: privacy/promptlens-privacy-policy.yml
- type: DataLicense
  url: data-license/promptlens-data-license.yml
apis:
- name: PromptLens API
  description: PromptLens Product API providing prompt retrieval and management via OAuth.
  humanURL: https://www.promptlens.io/docs/api-reference
  baseURL: https://www.promptlens.io
  aid: promptlens:promptlens-api
x-coverage:
  state: gated
  reason: partner-login
  method: derived
  generated: '2026-10-18'
  generator: derive-coverage.py (pre-flight evidence)
  detail: the company serves an API surface but requires credentials before any description of it can be read
  evidence:
  - url: https://promptlens.io/openapi.json
    status: null
  - url: https://www.promptlens.io/openapi.json
    status: null
  - url: https://app.promptlens.io/mcp
    status: 401
  - url: https://promptlens.io/
    status: 200
x-enrichment:
  date: '2026-10-18'
  status: enriched
  artifacts_added: 28
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

PromptLens API — frequently asked questions

Does PromptLens have an API?

Yes. APIs.io lists 1 API from PromptLens, including PromptLens API.

How do I authenticate with the PromptLens API?

PromptLens documents its authentication (3 schemes). The details are profiled on APIs.io as PromptLens Authentication.

How much does the PromptLens API cost?

PromptLens publishes its prices; its Free plan is $0 per organization/ month as of 2026-10-18. APIs.io lists 3 pricing plans for PromptLens, with each plan's price, limits and inclusions under Pricing on this page.

Is the PromptLens API ready for AI agents?

PromptLens has a Kin Score of 44.5 out of 100 (developing) and an Agent Readiness score of 38.8 (agent-ready), scored by API Evangelist on 2026-11-13.

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