For developers, researchers & AI agents
Build on Harpd data
Harpd publishes its product discovery and ranking data as open, machine-readable surfaces:datasets in JSON and CSV, a public read-only APIthat needs no key, and AI-readable files for answer engines. Everything derives from theHarpd Rank board and is licensedCC BY 4.0.
Quick answer
What can developers build on Harpd data?
Harpd exposes 1,122 products in the published Harpd catalog and every category board as JSON and CSV datasets, a read-only public API (no key required), and AI-readable surfaces (llms.txt, agent.json, the per-page SEO/GEO payload). All public data is licensed CC BY 4.0 — reuse commercially with attribution.
- Products
- 1,122
- Auth
- None for public endpoints
- License
- CC BY 4.0
- Schema
- v1.0
Data source: Harpd public datasetsAPI referenceDataset indexMethodology
Why it matters
Open, key-less, CC BY 4.0 data lets any developer, researcher or AI agent build on Harpd Rank without negotiating access. Because every surface shares one schema and one licence, a tool built against one endpoint works against all of them.
Limitations
- Public data reflects products submitted to Harpd Rank; it maps this platform’s coverage, not the entire software market.
- The public API is read-only and rate-limited; it is for reuse, not for writing Rank data.
- Rank Points are promotional placement, not an editorial quality score.
Data source: Harpd public datasets
Developer surfaces
The purchasable machine surface: free search and rankings, paid comparison, research and model cost optimisation over x402. No signup, no API key, no dashboard.
Agent examplesFive worked examples — Claude, Cloudflare Agent, OpenAI-style client, generic HTTP agent and MCP agent — each walking discover → 402 → pay → retry → receive → cite.
Harpd for AI AgentsWhat an agent can buy, what it costs, and how payment works without a human in the loop.
Agent trust pageMethodology, freshness, provenance, versioning, uptime, privacy, limits and the refund policy an operator needs before connecting a wallet.
Public APIEvery public endpoint: datasets, Rank API and the per-page SEO/GEO payload. No key, no signup, CC BY 4.0.
Open datasets1,122 products in the published Harpd catalog and every category board as JSON and CSV, regenerated from live Rank data.
Dataset referenceEvery dataset Harpd serves: endpoint, fields, update cadence and the exact licence terms for reuse.
Dataset catalogueThe full catalogue of public Harpd datasets with their scope, size and canonical URL.
Research referenceHow Harpd research is produced and how to reproduce a report from the published snapshot and method.
Field schemaThe field dictionary for every endpoint (schema version 1.0) and what the public dataset deliberately excludes.
MethodologyHow Rank Points are created and ordered — the rules behind every number, machine-readable at /data/methodology.json.
CitationsReady-to-copy citation lines (plain text and BibTeX) for every dataset, with the data date and coverage.
What is Harpd?The canonical entity definition: what Harpd is, what it publishes and how AI systems access it.
Evidence registerEvery public claim, its dataset, method and data date — the same register as /data/evidence.json.
AI / agent accessMachine-readable entity endpoints (products, categories, research, methodology, citations, Discovery Index) — JSON, no JavaScript.
Discovery IndexNon-sponsored coverage dataset of software, AI and developer products, independent of Rank Points.
External authorityVerified third-party references to Harpd — the one score Harpd cannot inflate itself.
Adopt Harpd dataCopy-paste datasets, API and embed snippets, the Powered by Harpd badge, and starter templates. Register your adoption in one click.
Adoption registryVerified third parties building on Harpd data — the external-authority tracker for reuse.
Adoption metricsReal adoption, citation and usage counts derived from Harpd data surfaces.
Machine-readable files
A plain-text index of Harpd facts for AI crawlers and answer engines.
Agent capability manifestCapabilities, endpoints, payment rails and limits for the purchasable Agent API.
Agent API contractOpenAPI 3.1 for the Agent Data API, generated from the same catalog the Worker enforces.
OpenAPI contractThe machine-readable API contract served by the collector.
Live price listThe exact object that builds the HTTP 402 challenge. Prices are data, not prose.
MCP tool catalogHarpd products as MCP tools, with the paid ones marked and priced.
Agent discoveryThe agent.json capability manifest for AI agents.
Evidence graph (JSON)Claims, datasets and gate results as a typed graph.
Data policy in one paragraph
The public datasets contain only public product and ranking information. They never include user accounts, email addresses, payment or Credit transaction data, moderation notes or unapproved submissions. Rank Points are promotional placement — paid with Credits — not an editorial quality score, and the data says so. The methodology is published at/rank/methodology/ and mirrored at/data/methodology.json. What is excluded is stated on the dataset index and the evidence register.
Citation-ready by design
Every dataset carries a ready-to-copy citation with its data date, coverage and licence — plain text and BibTeX on the citation hub. Quoting a single product? Link its profile page so the citation stays verifiable after the board moves.