{"uid":"cap_DvAX_D-WBHiNvRk7UyXFF","slug":"x402-seller-leaderboard-by-usdc-inflow-7e6d2ff8","name":"x402 Seller Leaderboard by USDC Inflow","description":"Leaderboard of x402 sellers by observed USDC inflow, with distinct payers, an HHI concentration measure and wash-risk flags. Sellers below the observation floor are returned unrated, not accused. The payer-graph discount applies only where wallet scan coverage supports it. HHI measures concentration, not common control.","url":"https://mcpfax-intel.bowling-anthony.workers.dev/seller-rank?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_Po3nd-hrk-joEkSyHjijJ","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Returns a ranked leaderboard of x402 sellers ordered by observed USDC inflow, with payer diversity metrics, HHI market concentration scores, and wash-trade risk flags.","exampleAgentPrompt":"Show me the top x402 sellers ranked by USDC inflow in the AI tools category — I want to see their payer counts, HHI concentration scores, and any wash-risk flags so I know who's actually earning legitimately.","exampleUseCases":[{"title":"Finding top earners in a niche","prompt":"Who are the top-ranked x402 sellers in the data enrichment category by actual USDC inflow? Show me their distinct payer counts and flag any with wash-risk concerns."},{"title":"Assessing market concentration before investing","prompt":"I'm looking at entering the x402 image generation category — can you pull the seller leaderboard and tell me how concentrated it is using the HHI score so I know if it's winner-take-all?"},{"title":"Vetting a specific seller's legitimacy","prompt":"Can you check where the seller at wallet address 0xABC123 ranks in the x402 leaderboard and whether they have any wash-risk flags or suspicious payer patterns?"}],"resultDescription":"An ordered list of x402 sellers with their USDC inflow totals, distinct payer counts, HHI market concentration score for the category, wash-risk boolean flags, and an 'unrated' status for sellers below the observation floor. The payer-graph discount is included only when wallet scan coverage is sufficient.","failureModes":["Sellers below observation floor returned as unrated rather than ranked — not an error but may appear as missing data","Payer-graph discount suppressed and seller not ranked if wallet scan coverage is insufficient","Empty result set if no sellers meet the observation floor in the requested category","Invalid category or date range returns an error response","Payment of 0.01 USDC required per call — unpaid requests rejected"],"whenToPreferThis":"Use this endpoint when you need to identify who is genuinely earning in a specific x402 category, assess market concentration among sellers, or screen for wash-trade risk. Prefer this over generic blockchain analytics when you specifically want x402 protocol seller rankings with built-in concentration and fraud-risk metrics. Use sibling endpoints for unmet demand analysis or emerging seller discovery.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T00:43:39.586Z","isFirstParty":false,"canonicalSlug":"x402-seller-leaderboard-by-usdc-inflow-7e6d2ff8"}