Harpd

Harpd.com is an independent AI product discovery and ranking intelligence platform publishing rankings, comparisons, research, datasets, benchmarks and evidence. It operates Harpd Rank, a public ranking system where products can earn rank points, and provides open data APIs for datasets in JSON and CSV under CC BY 4.0.

Harpd publishes 2 API contracts indexed on the APIs.io network: Agent API and Payments API. Tagged areas include Artificial Intelligence, Rankings, Data, Research, and Open Data.

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

Harpd’s developer surface includes pricing, changelog, engineering blog, API reference, and 30 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

52.3/100 developing Agent 43/100 agent ready Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessPaid

1 published contract 1 MCP Servers

Artificial Intelligence Rankings Data Research Open Data Company

Kin Score

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

Composite quality — 52.3/100 · developing

Contract Quality 11.3 / 21

Developer Ergonomics 4.5 / 17

Access Clarity 12.7 / 17

Operational Transparency 4.7 / 11

Contract Governance 2.2 / 10

Discoverability 6.5 / 9

Regulatory Posture 4.9 / 15

Agent readiness — 43/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 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 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 4 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 8 / 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 Government & Public Sector 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):

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 →
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 →
Request/Response Examples +7 pts — share of operations carrying request/response examples; else an Examples / Code Samples link 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 →
Agent Skills +5 pts — skills artifact present, graded by who authored it Ask about this →

3 more unmet checks in the Agent Readiness table above.

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

Developer Ergonomics scores 26.2 — up to +14.8 composite points Ask about this →
Contract Quality scores 53.4 — up to +11.7 composite points Ask about this →
Contract Governance scores 22.0 — up to +9.4 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/harpd-com/apis.yml: open an issue on github.com/api-evangelist/harpd-com 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 5

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.

Agent2Agent

measured — observed by APIs.io (flavored)

Model Context Protocol (MCP)

measured — observed by APIs.io (documented)

OAuth 2.0 Protected Resource Metadata

measured — observed by APIs.io (verified)

Dynamic Client Registration

measured — observed by APIs.io (published)

OpenAPI

measured — observed by APIs.io (published)

APIs 2

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

Harpd Agent API

The Agent API from Harpd — 6 operation(s) for agent.

Harpd Payments API

The Payments API from Harpd — 2 operation(s) for payments.

MCP Servers 1

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

Harpd MCP Server

Remote MCP server at api.harpd.com; 7 tools listed.

MCP SERVER

Harpd API pricing

Prices published by Harpd, read 2026-11-11 from harpd.com/pricing/.

Plan	Price
10 Credits	$10 USD
50 Credits	$50 USD
100 Credits	$100 USD
500 Credits	$500 USD
1,000 Credits	$1,000 USD
compare	$0.01
optimize_model	$0.01
research	$0.05

All 13 plans, limits and sources →

Pricing Plans 1

Published pricing tiers and plan structures.

Harpd Plans Pricing

13 plans

PLANS

Semantic Vocabularies 1

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

Harpd Com Context

5 classes · 11 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.

Harpd API Rules

34 rules · 32 error-severity 1 warn-severity 1 info-severity

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

RankIntelligenceResponse

8 properties

JSON SCHEMA

Security Posture 3

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

Harpd Domain Security

TLSv1.3 · HSTS · DNSSEC · DMARC

SECURITY

Harpd Vulnerability Disclosure

security.txt · contact published

SECURITY

Harpd Trust Center

SOC 2

SECURITY

Agentic Access (API Evangelist recommendations) 1

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

Harpd Agentic Access

8 operations

8 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Login

DeveloperPortal

DeveloperPortal

Documentation 1

Reference material describing how the API behaves

APIReference

APIReference

Agent Surfaces 4

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

LLMsTxt

MCPServer

WellKnown

Design & Contract 6

Pagination, idempotency, versioning, errors, and events

Spectral

JSONLD

Vocabulary

DataModel

ErrorCatalog

Conformance

Build 3

SDKs, sample code, and the tooling you integrate with

SDKs

SDKs

Packages

Packages

GitHubOrganization

GitHubOrganization

Access & Security 6

Authentication, authorization, and security posture

Compliance

SecurityTxt

Security

TrustCenter

VulnerabilityDisclosure

VulnerabilityDisclosure

DomainSecurity

DomainSecurity

Operate 2

Status, limits, changes, and where to get help

StatusPage

StatusPage

ChangeLog

ChangeLog

Commercial 4

Pricing, plans, and the legal terms of use

Plans

TermsOfService

PrivacyPolicy

Pricing

Company 3

The organization behind the API

Newsroom

Newsroom

Blog

Blog

Website

Website

Other 3

Properties that don't map to a standard resource type

AgentCard

AgentCard

Hosts

Hosts

Vendors

Vendors

Source (apis.yml)

aid: harpd-com
name: Harpd
accessModel:
  pricing: paid
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Paid
  confidence: low
  source:
  - plans
  - security
  generated: '2026-11-13'
  method: derived
image: https://harpd.com/og-harpd.png
description: Harpd.com is an independent AI product discovery and ranking intelligence platform publishing rankings, comparisons,
  research, datasets, benchmarks and evidence. It operates Harpd Rank, a public ranking system where products can earn rank
  points, and provides open data APIs for datasets in JSON and CSV under CC BY 4.0.
url: https://artifacts.apis.io/harpd-com/apis.yml
x-type: company
x-source: harvest:mcp-registry
x-tier: profiled
x-tier-reason: enrichment pass 2026-11-11 (modular-v1; was harvest)
specificationVersion: '0.20'
created: '2026-11-10'
modified: '2026-11-10'
tags:
- Artificial Intelligence
- Rankings
- Data
- Research
- Open Data
- Company
tags_raw:
- AI
- Rankings
- Data
- Research
- OpenData
- Company
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
common:
- type: AgenticAccess
  url: agentic-access/harpd-com-agentic-access.yml
- type: Plans
  url: plans/harpd-com-plans-pricing.yml
- type: Spectral
  url: rules/harpd-com-rules.yml
- type: JSONLD
  url: json-ld/harpd-com-context.jsonld
- type: Vocabulary
  url: vocabulary/harpd-com-vocabulary.yml
- type: DataModel
  url: data-model/harpd-com-data-model.yml
- type: Compliance
  url: https://harpd.com/security
- type: ErrorCatalog
  url: errors/harpd-com-problem-types.yml
- type: Conformance
  url: conformance/harpd-com-conformance.yml
- type: LLMsTxt
  url: llms/harpd-com-llms.txt
- type: AgentCard
  url: a2a/harpd-com-a2a.yml
- type: MCPServer
  url: mcp/harpd-com-mcp.yml
- type: SecurityTxt
  url: well-known/harpd-com-security.txt
- type: WellKnown
  url: well-known/harpd-com-well-known.yml
- type: Hosts
  url: hosts/harpd-com-hosts.yml
- type: Vendors
  url: vendors/harpd-com-vendors.yml
- type: SDKs
  url: packages/harpd-com-packages.yml
- type: Packages
  url: packages/harpd-com-packages.yml
- type: TermsOfService
  url: https://harpd.com/terms/
- type: StatusPage
  url: https://harpd.com/status/
- type: Security
  url: https://harpd.com/security/
- type: PrivacyPolicy
  url: https://harpd.com/privacy/
- type: Pricing
  url: https://harpd.com/pricing/
- type: Newsroom
  url: https://harpd.com/press/
- type: Login
  url: https://app.harpd.com/login
- type: GitHubOrganization
  url: https://github.com/harpd-dev
- type: ChangeLog
  url: https://harpd.com/changelog/
- type: Blog
  url: https://harpd.com/blog/
- type: DeveloperPortal
  url: https://api.harpd.com</code
- type: APIReference
  url: https://harpd.com/developers/
- type: TrustCenter
  url: security/harpd-com-trust-center.yml
- type: VulnerabilityDisclosure
  url: security/harpd-com-vulnerability-disclosure.yml
- type: DomainSecurity
  url: security/harpd-com-domain-security.yml
- type: Website
  url: https://harpd.com/
apis:
- aid: harpd-com:harpd-com-agent-api
  name: Harpd Agent API
  description: The Agent API from Harpd — 6 operation(s) for agent.
  humanURL: https://harpd.com/developers/api/
  baseURL: https://api.harpd.com
  tags:
  - Agents
  tags_raw:
  - Agent
  properties:
  - type: OpenAPI
    url: openapi/harpd-com-agent-api-openapi.yml
  - type: JSONSchema
    url: json-schema/harpd-com-rank-intelligence-response-schema.json
- aid: harpd-com:harpd-com-payments-api
  name: Harpd Payments API
  description: The Payments API from Harpd — 2 operation(s) for payments.
  humanURL: https://harpd.com/developers/api/
  baseURL: https://api.harpd.com
  tags:
  - Payments
  properties:
  - type: OpenAPI
    url: openapi/harpd-com-payments-api-openapi.yml
x-enrichment:
  date: '2026-11-11'
  status: nochange
  artifacts_added: 0
  pass: modular-v1
  engine: identity=local,contract=local,surfaces=local,docs=local,regulatory=local

Harpd API — frequently asked questions

Does Harpd have an API?

Yes. APIs.io lists 2 APIs from Harpd, including Harpd Agent API and Harpd Payments API.

Is there an OpenAPI specification for the Harpd API?

Yes. APIs.io indexes 2 OpenAPI specifications for Harpd, each linked for download from this page.

How much does the Harpd API cost?

Harpd publishes its prices; its 10 Credits plan is $10 USD as of 2026-11-11. APIs.io lists 13 pricing plans for Harpd, with each plan's price, limits and inclusions under Pricing on this page.

Does Harpd have an MCP server?

Yes. APIs.io lists 1 MCP server for Harpd: Remote MCP server at api.harpd.com; 7 tools listed.

Is the Harpd API ready for AI agents?

Harpd has a Kin Score of 52.3 out of 100 (developing) and an Agent Readiness score of 43.2 (agent-ready), scored by API Evangelist on 2026-11-13.

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Tools for providers

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find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

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