niche · 0.8 market domain

Auctions

Score 17.6 / 100 44 providers +17 via APIs 29 APIs Search apis.io →
Business capabilities this tag reaches
Data & Reference Information Services 2
Variants seen in the corpus: AuctionAuctions

Providers using this tag (44)

Ranked by API Evangelist rating — Exemplar and Strong are expanded by default.

Developing 5 Usable, with meaningful gaps to close
Cox AutomotiveCox AutomotiveAutomotiveVehicle DataVehicle Valuations5 APIs53.2nowyourlink-comAdvertisingMarketplaceTechnology2 APIs45.9BidProwlGovernmentMarketplaceData1 API45.1eBayCommerceProductMarketplace25 APIs50.7SNHPNegotiationGame TheoryAI AgentsMCP4 APIs42.5
Thin 6 Limited public surface area
Ariba SourcingApprovalsB2BContracts3 APIs34.9CREXiReal EstateCommercial Real EstateMarketplaceProperty Data3 APIs34.8SuperRareNFTDigital ArtMarketplaceEthereum1 API33.5ArtsyArtMarketplaceCultureMuseums1 API28.4Whisky HunterWhiskySpiritsMarket Data1 API27.0TraderaMarketplaceE-CommerceSecondhand1 API33.1
Emerging 19 Early or largely undocumented
DripshopCompanyLive ShoppingCollectiblesTrading Cards1 API24.1ACV AuctionsCompanyVertical SoftwareAutomotiveMarketplace1 API22.8FoundationNFTDigital ArtMarketplaceEthereum2 APIs22.8BStalkerMarketplaceLiquidationAggregator1 API19.0AuctriaCompanyFundraisingNon-ProfitSoftware-as-a-Service18.4BidSurvivorAdvertisingMarketplaceSoftware-as-a-Service1 API16.4Everything But The HouseCompanyMarketplaceE-Commerce15.1InvaluableCompanyMarketplaceArt14.8LiveAuctioneersCompanyConsumerMarketplace14.7Unicorn AuctionsCompanyMarketplaceE-Commerce13.9EPEX SPOTDay-Ahead PricesElectricityEnergy MarketsPower Exchange4 APIs12.5Connells GroupReal EstateUnited KingdomProperty ListingsBrokerage1 API24.3Apiauto SpaceUsed CarsCar ImportersDealersPrice Trackers1 API23.6OffrCompanyPropTechReal EstateProperty Transactions18.0Term FinanceCompanyDeFiLendingFixed Rate16.5hobbyDBCompanyCollectiblesMarketplaceDatabase15.0ListiaCompanyMarketplaceE-CommercePeer-to-Peer14.0IronPlanetCompanyE-CommerceMarketplaceHeavy Equipment12.6Ray WhiteReal EstateAustraliaBrokerageProperty Listings11.7
Minimal 13 Almost no public developer surface
GuaziCompanyTechnologyAutomotiveUsed Cars10.3JoopiterCompanyMarketplaceCollectibles9.8Jones, MartinCompanyReal EstateCollectibles7.0Bids.comE-CommerceJewelryMarketplace5.8UxinCompanyConsumerAutomotiveUsed Cars5.1KAR Auction Services (Historical)AutomotiveHistoricalRemarketing3.9CatawikiCompanyConsumerMarketplace3.8LivshoCompanyMarketplaceLive ShoppingE-Commerce3.4AuctionCompanyMarketplaceBidding3.1B-StockLiquidationWholesaleinventory resale3.1CarOnSaleCompanyAutomotiveMarketplaceUsed Cars10.3AltCompanyCollectiblesTrading CardsSports Cards8.1AstaDooReal EstateArtificial IntelligenceItaly1 API7.8
Unrated 1 Not yet scored
TremorCompanyReinsuranceInsuranceInsurtech

APIs with this tag (29)

Ranked by the provider's API Evangelist rating — the Kin Score is scored per provider, not per API, so every API of a provider shares its band. How the rating works →

Strong 2 Solid coverage with minor gaps
Bullish WebSocket Auction Feed APIAsyncAPI 3.0.0 document for the real-time auction feed, delivering phase and order-imbalance data for Bulli...62.5Domain Group Auction Collection APIThe Auction Collection API from Domain Group — 2 operation(s) for auction collection: the auction calling s...59.9
Developing 7 Usable, with meaningful gaps to close
Avito Auction APIThe Auction API from Avito — 1 operation(s) for auction.53.4Manheim Event NotificationsPublish/subscribe business-event notification service for the Manheim auction lifecycle. Consumers register...53.2Manheim Hypermedia API SuiteManheim's third-party integration surface — a suite of hypermedia (href-linked) JSON REST APIs over the who...53.2MISO FTR MPMA Market User APIThe Financial Transmission Rights / Multi-Period Multi-Auction market user API — four SOAP services coverin...51.3A7 Analytics Platform - Auction Simulation APISimulate Xetra auctions against historical order book data on the A7 Analytics Platform.51.1SNHP Auctions APITier 2: single-unit auctions42.5Aura Historia Auctions APIPublic Auction discovery, catalogue reads, and administrator Auction management.41.6
Thin 11 Limited public surface area
Blizzard Entertainment Auctions APIRetrieve live auction-house listings per connected realm.38.6Nord Pool Auction APIJSON REST API for day-ahead auction trading - integrated order submission and trade capture across the Nord...38.0Nord Pool Auction APIThe Auction API from Nord Pool — 14 operation(s) for auction.38.0CoW Swap Auction APIThe Auction API from CoW Swap — 1 operation(s) for auction.35.1Flashbots Auction Relay (JSON-RPC)JSON-RPC endpoint for submitting bundles and private transactions to the Flashbots block builder. Supports ...34.1SuperRare Rare Protocol CLICommand-line interface and SDK for deploying ERC-721 NFT collections, minting tokens, managing reserve-pric...33.5SuperRare Smart Contracts - The BazaarUnified marketplace and auction house smart contract on Ethereum that enables reserve-price auctions, sale ...33.5Department of the Treasury Auctions APITreasury securities auctions data29.7TreasuryDirect Securities APIPublic reference data on marketable Treasury securities (auctions, results, security details) published via...29.7FCC Spectrum Dashboard APIReturns a high-level overview of spectrum ownership across the United States within the 225 MHz to 3700 MHz...28.7Whisky Hunter Auctions APIThe Auctions API from Whisky Hunter — 1 operation(s) for auctions.27.0
Emerging 9 Early or largely undocumented
Manifold Marketplace ContractsSmart contract system powering Manifold Gallery listings and Marketplace Widgets. Supports Auction Listings...25.2birkinbagstock-com Auctions APIThe Auctions API from birkinbagstock-com — 1 operation(s) for auctions.24.7Squeeth Portal Auction APIWeb interface and data feed for the Crab Strategy weekly auction mechanism. The Squeeth Portal at squeethpo...23.1Foundation Smart Contract APIEthereum smart contract interface for direct on-chain interaction with Foundation marketplace contracts. Su...22.8Foundation Subgraph APIGraphQL API powered by The Graph protocol that indexes all Foundation NFT marketplace activity on Ethereum ...22.8Rocket Pool Auction APIThe Auction API from Rocket Pool — 3 operation(s) for auction.19.2Ten-XOnline commercial real estate transaction and auction platform for buyers and sellers of CRE assets.14.0EPEX SPOT Day-Ahead and Intraday Auction Market Data APIRead-only API subscription (Day-Ahead and pan-EU Intraday API Read-only, EUR 1,040.00/month for internal us...12.5EPEX SPOT MATS Auction Trading APIMember trading API for the Multiple Auction Trading System (MATS), the platform that replaced the legacy ET...12.5

Companies reaching this through an API (17)

These companies publish an API, specification or operation carrying “Auctions” but do not classify their business under it. Listed unranked and kept out of the count above, because one tagged operation is not a statement about what a company does.

Aura Historia Avito birkinbagstock-com Blizzard Entertainment Bullish CoStar Group CoW Swap Department of the Treasury Deutsche Börse Domain Group FCC (Federal Communications Commission) Flashbots Manifold MISO Nord Pool Opyn Rocket Pool

Score breakdown

Frequency
49.0
log-scaled weighted occurrences
Breadth
0.6
spread across providers
Quality lift
23.4
mean composite of providers using it
Cohesion
3.4
strength of nearest seed neighbor

Related tags

Collectibles 12 co-occurrences Bidding 5 co-occurrences Art 6 co-occurrences Listings 8 co-occurrences Ethereum 8 co-occurrences Smart Contracts 6 co-occurrences Marketplace 34 co-occurrences Profiles 5 co-occurrences

Where this tag comes from

Provider tag44
Api tag29
Openapi tag9
Openapi op tag18

Cohort brief

Auto-generated

The 39 providers in the APIs.io catalog tagged Auctions, scored on the Kin Score. Every figure below is computed from the catalog — nothing here is written.

Providers
39
of 44 in the catalog
Mean Kin Score
19.7
-3.1 vs catalog 22.8
Mean Agent Readiness
10.9
-2.4 vs catalog 13.3
Spread
3.1–53.2
median 15.1 · σ 13
How the 39 split by band
Exemplar 0Strong 0Developing 4Thin 6Emerging 18Minimal 11
Facet averages, against the whole catalog
FacetThis cohortCatalogDifferenceScored
Discoverability 58.9 57.9 +1 39
Contract Governance 7.3 9.4 -2.1 39
Access Clarity 22.6 25 -2.4 39
Operational Transparency 9.8 12.4 -2.6 39
Developer Ergonomics 18.9 22.1 -3.2 39
Contract Quality 13 18.2 -5.2 39

A facet is averaged over the members that carry it, not over the whole cohort — the “Scored” column is that count. Averaging an absent facet as zero would score our own coverage gaps as the providers’ posture.

What this cohort publishes
ArtifactThis cohortCatalogDifference
MCP server (any) 10% 16% -6
MCP server (first-party) 10% 14% -4
Agent Skills 0% 0% 0
OAuth scopes 13% 13% 0
Security 98% 98% 0
Arazzo workflows 3% 2% +1
Governance rules 28% 35% -7

mcp_pct counts any mcp/ artifact including ones API Evangelist derived from the provider OpenAPI; mcp_first_party_pct counts only servers the provider publishes. Prefer the latter.

Top by Kin Score
  1. 1 Cox Automotive 53.2
  2. 2 eBay 50.7
  3. 3 nowyourlink-com 45.9
  4. 4 BidProwl 45.1
  5. 5 SNHP 42.5
  6. 6 Ariba Sourcing 34.9
  7. 7 CREXi 34.8
  8. 8 SuperRare 33.5
  9. 9 Tradera 33.1
  10. 10 Artsy 28.4
Top by Agent Readiness
  1. 1 nowyourlink-com 70.9
  2. 2 SNHP 43.1
  3. 3 BidProwl 36.7
  4. 4 Cox Automotive 34.5
  5. 5 Ariba Sourcing 33
  6. 6 eBay 32
  7. 7 Whisky Hunter 31.2
  8. 8 Connells Group 31.1
  9. 9 SuperRare 29.6
  10. 10 Artsy 27.6
All 44 members of this roster resolve to a provider in the catalog; 39 carry a score (89%). The figures above describe the scored members only.
Coverage caveat. 34 of 39 scored members had under half their catalog-attributable points satisfied at all (catalog_earned / catalog_max < 0.5). They are INCLUDED in the mean above. A large share here means the cohort mean is partly a measurement of how far our enrichment reached, not only of how these providers publish.Generated from the catalog build of 7 November 2026, across 38912 providers, using the same computation served by the APIs.io cohort API. Briefs are published for rosters of 5 or more scored providers; below that a distribution is not meaningful.

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Tools for tags

7 MCP tools reach this
  • find_tagsBrowse and filter every tag in the catalog.
  • get_cohortThis tag as a scored cohort — every provider carrying it, with scores.
  • cohort_statsPRO — the distribution across this tag: mean, median, band split, adoption rates.
  • cohort_rankingsPRO — the leaderboard, on composite AND agent-readiness axes.
  • 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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