{"uid":"cap_5YhsrGb67i28eiVJZhlmh","slug":"x402-trust-discovery-api-leaderboard-a15d3969","name":"x402 Trust & Discovery API — Leaderboard","description":"Independent pre-purchase safety and reputation checks for x402 and MPP endpoints, plus keyless onchain data on Base. Accepts BOTH EIP-3009 and Circle Gateway credentials — only 141 of 788 Base-payable resources do, and a single-credential buyer is locked out of 53.8% of this market on one rail or 28.3% on the other. GET /v1/guard?url=&credential= answers whether the credential you carry can pay a given endpoint at all, before you try. Searching this market for \"is this API endpoint a scam\" returns registries and explorers but no dedicated service; that gap is what /v1/guard fills, inspecting an endpoint WITHOUT paying it and returning a go / test-with-minimum / do-not-pay verdict backed by onchain settlement history.","url":"https://gkyf2bs3b4p35hwwg5zzsnejeu.srv.us/v1/leaderboard?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"by":{"type":"string","description":"Rank by revenue, calls or payers."},"of":{"type":"string","description":"endpoints or sellers."},"limit":{"type":"integer","description":"Maximum rows, 1-50."}}},"responseSchema":{"type":"json","example":{}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","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":"down","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_5BG12bujQKDL-hUUCXBCk","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","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 top x402/MPP endpoints or sellers by revenue, call volume, or unique payers on Base","exampleAgentPrompt":"Show me the top 10 x402 endpoints ranked by revenue so I can see which APIs are earning the most in the micropayment ecosystem.","exampleUseCases":[{"title":"Discover top-earning x402 APIs","prompt":"What are the top 20 x402 endpoints ranked by revenue? I want to see which pay-per-call APIs are making the most money on Base."},{"title":"Find most active API sellers","prompt":"Who are the top 10 sellers in the x402 ecosystem ranked by number of calls? I want to know which API publishers are getting the most traffic."},{"title":"Identify APIs with broadest buyer reach","prompt":"Give me a leaderboard of the top 15 x402 endpoints ranked by number of unique payers — I want to find the APIs with the widest adoption among buyers."}],"resultDescription":"A ranked JSON list of up to 50 endpoints or sellers, ordered by the chosen metric (revenue, calls, or payers), showing onchain-derived statistics aggregated from Base settlement history.","failureModes":["Invalid 'by' value (not revenue/calls/payers) — likely returns 400 or empty result","Invalid 'of' value (not endpoints/sellers) — likely returns 400","limit out of range (>50 or <1) — may return 400 or clamp to bounds","No data available yet — returns empty array","Service unavailable — non-2xx response"],"whenToPreferThis":"Use this endpoint when you need a ranked overview of the x402/MPP ecosystem — e.g. to discover high-traffic or high-revenue endpoints, identify top sellers, or benchmark a specific API against the market. Prefer this over the /v1/guard endpoint when you want aggregate market intelligence rather than a safety check on a specific URL.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T07:26:15.345Z","isFirstParty":false,"canonicalSlug":"x402-trust-discovery-api-leaderboard-a15d3969"}