# Harpd — product discovery, Rank and Apps ## Agent Market Harpd Agent Market is a machine-readable discovery surface for autonomous agents. The public catalog at [api.harpd.com/api/agent/v1/catalog](https://api.harpd.com/api/agent/v1/catalog) describes resource IDs, endpoints, methods, input/output schema URLs, pricing mode, price, currency, payment protocols, availability, freshness, and terms. Free resources include current [Rank boards](https://api.harpd.com/api/agent/v1/rankings) and [approved product profiles](https://api.harpd.com/api/agent/v1/products/{slug}); basic Rank discovery is not paywalled. The production x402 payment rail is enabled on Base mainnet. `rank-intelligence-v1` at [rank-intelligence endpoint](https://api.harpd.com/api/agent/v1/premium/rank-intelligence) costs 0.1 USDC per completed request and follows Request -> HTTP 402 -> payment -> retry -> result. It returns current Top 100 positions, daily movement, immutable Monthly and Weekly placement history, category summaries, paid and promotional Rank Point provenance, and the current #100 threshold. Its HTTP 402 response publishes x402 Bazaar discovery metadata, allowing compatible agents and Bazaar MCP clients to discover the input/output schema, sign payment and retry automatically. Human Credits and Stripe purchases remain separate from machine payment receipts. OpenAPI is available at [openapi.json](https://api.harpd.com/openapi.json). ## What Harpd is Harpd Rank is Harpd's primary public platform. It is a product discovery database and transparent promotional leaderboard for makers. Products can submit for free, receive a stable public product profile, appear in organic discovery surfaces and optionally spend Harpd Credits to build Rank Points. Harpd also builds focused Harpd Apps. These products keep their own product-specific positioning and do not redefine Harpd's primary Rank-first identity. ## Harpd Rank mechanics - [Canonical public leaderboard](https://harpd.com/rank/) - [Overall leaderboard](https://harpd.com/rank/) - [Current Monthly leaderboard](https://harpd.com/rank/monthly/) - [Current Weekly leaderboard](https://harpd.com/rank/weekly/) - [Categories](https://harpd.com/rank/categories/) - [New products](https://harpd.com/rank/new/) - [Historical reports](https://harpd.com/rank/history/) - [Product submission and maker controls](https://harpd.com/rank/manage/) - [Rank Credits](https://harpd.com/rank/credits/) - [Rules](https://harpd.com/rank/rules/) - [Objective metrics (non-sponsored)](https://harpd.com/data/rank-open-data.json) — verified GitHub stars and first-party referral counts, no Rank Points Every approved product is eligible for Overall Rank for free, even with no Credit balance, purchase history or Rank spend. Overall score is lifetime completed Rank Points. Higher scores rank first; ties use the earliest time the score was reached, then approval time, then stable product ID. For zero-RP products, approval time is the score-reached time. Monthly eligibility requires either approval during the named UTC calendar month or at least one Rank Point earned in that month. Weekly eligibility requires either approval during the named UTC Monday–Sunday period or at least one Rank Point earned in that week. Period score is RP earned in that period, so newly approved free listings may appear with 0 RP while old 0-RP products do not carry into every new period. One completed Credit spent through the Rank spending flow creates one permanent Rank Point. The point contributes to Overall and to the active UTC Monthly and Weekly boards. Rank Points cannot be converted back into wallet Credits. Verification is required before spending Credits to promote a product, not for free Rank eligibility, subject to existing moderation approval. Public boards are limited to positions 1–100. Products outside the Top 100 retain public profiles showing Rank Points and the label "Outside Top 100." Authenticated owners can see the exact position, current #100 RP threshold and additional RP required to enter the Top 100. Closed Monthly and Weekly snapshots retain every eligible placement, including positions outside the public Top 100, while archive pages emphasize the Top 100. Credit-funded Rank Points are optional promotional placement. Free listings with 0 RP are not paid placement. Rank is not an editorial recommendation, rating, review or claim that a product is "best." Position can change and does not guarantee impressions, clicks, traffic, leads, sales or conversions. Harpd sells measurable visibility, not backlinks or PageRank. ## Objective metrics (non-sponsored signals) Rank Points are paid promotional placement, so Harpd publishes a second dataset containing only signals that cannot be bought: [harpd.com/data/rank-open-data.json](https://harpd.com/data/rank-open-data.json). - `github_stars` — stargazers_count read from the GitHub REST API endpoint `GET /repos/{owner}/{repo}` for the product's declared repository. Refreshed at most once per week per listing; `github_stars_at` is the ISO timestamp of that verified read. - `harpd_referred_visits_total` — Harpd's own first-party outbound click counter for the product profile. - The dataset contains no Rank Points, no rank positions and no promotional fields. - A metric with no verified source is published as `null`. Harpd does not estimate, infer or interpolate objective metrics, and it does not sell them. - The promotional board (Rank Points, rank positions) is published separately at /data/rank.json and is labelled as promotional placement. ## Product entities and discovery Each approved product can have a stable public URL under [harpd.com/rank/{slug}/](https://harpd.com/rank/) containing real identity, category, current Top-100 status, permanent Rank Points and available closed-period history. Free products with zero Rank Points are eligible for Overall Rank, their public profile, category membership and New Products discovery. They are also eligible for the Monthly or Weekly board during the UTC period in which they were approved. Zero Rank Points are labeled as a free listing, not paid placement. Category and historical pages are kept out of search indexing until they contain enough real approved products. No fake products, fake Rank Points, fake traffic or fake performance claims are used for marketplace cold start. The [Product Discovery Index framework](https://harpd.com/research/product-discovery-index/) is the official statement of which signals Harpd measures, how each is produced, and what each may and may not be used to claim. ## Developers (public data API) - [Developer hub](https://harpd.com/developers/) — datasets, AI access and citation surfaces at a glance - [Public API reference](https://harpd.com/developers/api/) — the read-only Harpd API: dataset endpoints in JSON and CSV, the Rank API and the per-page SEO/GEO payload. No authentication, no key, CC BY 4.0. ## Harpd Apps - [SiteCheck](https://check.harpd.com/) — public website technology and security checks - [Langue](https://langue.harpd.com/) — focused language lessons and voice practice - [ImgKit](https://gift.harpd.com/) — personal photo gift creation - [Stillwell](https://harpd.com/products/stillwell/) — sleep stories, guided meditation, soundscapes and Voice Stories - [Fate](https://fate.harpd.com/) — a symbolic life roguelike - [CrewProof](https://harpd.com/products/crewproof/) — scheduling and proof of service for cleaning teams - [Cleaning business scheduling software](https://harpd.com/crewproof/cleaning-business-scheduling-software/) — recurring-job planner for residential cleaning companies - [Maid service scheduling software](https://harpd.com/crewproof/maid-service-scheduling-software/) — maid service scheduling and crew assignment - [Commercial cleaning scheduling](https://harpd.com/crewproof/commercial-cleaning-scheduling/) — recurring schedules for commercial cleaning contracts - [Recurring cleaning schedule](https://harpd.com/crewproof/recurring-cleaning-schedule/) — weekly, biweekly and monthly visit planning - [Cleaning checklist app](https://harpd.com/crewproof/cleaning-checklist-app/) — per-visit checklists crews complete from a phone browser - [Cleaning before-and-after photo app](https://harpd.com/crewproof/cleaning-before-after-photo-app/) — before-and-after photo proof per job - [Cleaning proof of service](https://harpd.com/crewproof/cleaning-proof-of-service/) — arrival, checklist and photo evidence in one record - [Cleaning customer notifications](https://harpd.com/crewproof/cleaning-customer-notifications/) — automatic arrival and completion emails ## Harpd Insights Harpd Insights is organized around Rank & Discovery, Launch & Growth, AI Products, Building Harpd, and the preserved AI Cost & Agents library: [harpd.com/blog/](https://harpd.com/blog/) Harpd continues to maintain its open-source work as focused technical resources. ## Trust boundaries Harpd does not claim paid Rank placement is independent editorial judgment. External links whose placement can be influenced by Rank spend are qualified as sponsored and nofollow. Maker analytics are private. Tracked outbound destinations are resolved only from approved stored product URLs and use temporary redirects. - [Privacy](https://harpd.com/privacy/) - [Terms](https://harpd.com/terms/) - [Security](https://harpd.com/security/) - [Contact](https://harpd.com/contact/) ## Frequently asked questions **What is Harpd?** Harpd is a product discovery and ranking intelligence platform: it helps people discover, compare and evaluate useful products and AI tools. Its primary public product is Harpd Rank, a transparent leaderboard where products submit for free and compete in Overall, Monthly and Weekly rankings. Harpd is operated by Harpd at [harpd.com](https://harpd.com/). **What is Harpd Rank?** Harpd Rank is a product discovery database and promotional leaderboard. Approved products receive a stable public product profile, appear in organic discovery surfaces, and may optionally spend Harpd Credits to accumulate permanent Rank Points. Ranking is visibility placement, not an editorial endorsement. **How is the Overall Rank score calculated?** Overall score is the lifetime number of completed Rank Points a product has earned. Higher scores rank first. Ties are broken by the earliest time the score was reached, then approval time, then a stable product ID. **How do Monthly and Weekly rankings work?** Monthly eligibility requires either approval during the named UTC calendar month or at least one Rank Point earned in that month. Weekly eligibility requires either approval during the named UTC Monday–Sunday period or at least one Rank Point earned in that week. The period score is the number of Rank Points earned within that period. **Is Harpd Rank free?** Yes. Every approved product is eligible for Overall Rank for free, including products with 0 Credits and 0 Rank Points. Spending Credits on Rank Points is optional promotional placement. **What is a Rank Point (RP)?** One Harpd Credit spent through the completed Rank spending flow creates one permanent Rank Point. That point contributes simultaneously to Overall and to the active UTC Monthly and Weekly boards. Rank Points cannot be converted back into Credits. **Is Harpd Rank a "best of" list or editorial recommendation?** No. Rank is not an editorial recommendation, rating or review, and it does not claim a product is "best." Credit-funded Rank Points are optional promotional placement. Position can change and does not guarantee impressions, clicks, traffic, leads, sales or conversions. **What does the public leaderboard show?** Public boards show positions 1–100. Products outside the Top 100 keep a public profile labeled "Outside Top 100." Authenticated owners can see their exact position, the current #100 Rank Point threshold and the additional Rank Points needed to enter the Top 100. **What is Harpd Agent Market?** Harpd Agent Market is a machine-readable discovery surface for autonomous agents. The public catalog at [api.harpd.com/api/agent/v1/catalog](https://api.harpd.com/api/agent/v1/catalog) describes resource IDs, endpoints, methods, input/output schemas, pricing, payment protocols, availability, freshness and terms. **What costs money in Harpd Agent Market?** Free resources include the current Rank boards and approved product profiles. The paid resource `rank-intelligence-v1` costs 0.1 USDC per completed request on Base mainnet and returns current Top 100 positions, daily movement, closed-period placement history, category summaries, Rank Point provenance and the current #100 threshold. Its HTTP 402 response publishes x402 Bazaar discovery metadata so compatible agents can discover, sign payment and retry automatically. **What are Harpd Apps?** Harpd Apps are focused standalone products built by Harpd: SiteCheck (website technology and security checks), Langue (language lessons and voice practice), ImgKit (personal photo gift creation), Stillwell (sleep stories, guided meditation, soundscapes and Voice Stories), Fate (a symbolic life roguelike) and CrewProof (scheduling and proof of service for cleaning teams). **Does Harpd use fake data for discovery surfaces?** No. Harpd uses no fake products, fake Rank Points, fake traffic or fake performance claims. Category and historical pages are kept out of search indexing until they contain enough real approved products. Harpd sells measurable visibility, not backlinks or PageRank. **Is verification required to be listed?** Verification is required before spending Credits to promote a product, not for free Rank eligibility, subject to existing moderation approval. ## Live Rank data (auto-generated 2026-09-09) This section is regenerated from the public Harpd Rank dataset on every build. 143 approved products. 21 categories currently hold at least one product — this is a count of populated categories, not of the boards Harpd operates; the complete board registry with per-board state is at https://harpd.com/data/categories.json. 1 product currently holds Rank Points (125 total). Every figure below is reproducible from https://harpd.com/data/rank.json (CC BY 4.0). ### Ranked products (hold at least one Rank Point) 1. imgkit — 125 Rank Points — ai-media — https://harpd.com/rank/imgkit-86d32f3e/ ### Category boards - developer — 48 products, 0 Rank Points — https://harpd.com/rank/category/developer/ - agents — 19 products, 0 Rank Points — https://harpd.com/rank/category/agents/ - other — 13 products, 0 Rank Points — https://harpd.com/rank/category/other/ - seo — 11 products, 0 Rank Points — https://harpd.com/rank/category/seo/ - ai-media — 9 products, 125 Rank Points, currently led by imgkit — https://harpd.com/rank/category/ai-media/ - productivity — 9 products, 0 Rank Points — https://harpd.com/rank/category/productivity/ - business — 6 products, 0 Rank Points — https://harpd.com/rank/category/business/ - marketing — 5 products, 0 Rank Points — https://harpd.com/rank/category/marketing/ - agencies — 4 products, 0 Rank Points — https://harpd.com/rank/category/agencies/ - health — 4 products, 0 Rank Points — https://harpd.com/rank/category/health/ - crypto — 3 products, 0 Rank Points — https://harpd.com/rank/category/crypto/ - domains — 2 products, 0 Rank Points — https://harpd.com/rank/category/domains/ - social — 2 products, 0 Rank Points — https://harpd.com/rank/category/social/ - design — 1 products, 0 Rank Points — https://harpd.com/rank/category/design/ - ecommerce — 1 products, 0 Rank Points — https://harpd.com/rank/category/ecommerce/ - education — 1 products, 0 Rank Points — https://harpd.com/rank/category/education/ - hiring — 1 products, 0 Rank Points — https://harpd.com/rank/category/hiring/ - leaderboards — 1 products, 0 Rank Points — https://harpd.com/rank/category/leaderboards/ - security — 1 products, 0 Rank Points — https://harpd.com/rank/category/security/ - travel — 1 products, 0 Rank Points — https://harpd.com/rank/category/travel/ - writing — 1 products, 0 Rank Points — https://harpd.com/rank/category/writing/ ### Endpoints for citation - /data/rank.json — every approved product with rank, Rank Points, category and profile URL - /data/top-products.json — top 100 with movement, maker website and alternatives URL - /data/market-index.json — category aggregates: product count, Rank Points, share, leader - /data/categories.json — every category with its description and product count - /data/rank-history.json — closed monthly and weekly snapshots - /data/methodology.json — the exact rules behind every number - /data/answers.json — every published /answers/ page with its question, intent and live board - /data/comparisons.json — every indexable comparison with both subjects and their ranks - /data/alternatives.json — every indexable alternatives page with its peer list in board order - /data/research.json — every published monthly research report - /data/evidence.json — the claim/evidence register ### How to cite Harpd. "Harpd Product Ranking Data" (retrieved 2026-09-09). 143 approved products in 21 populated categories. https://harpd.com/data/ — CC BY 4.0. Rank Points measure promotional ranking activity. They are not an editorial recommendation, rating or review, and position does not guarantee impressions, clicks, traffic, leads, sales or conversions.