{"id":"09a369e7-2e4f-4da5-bdd2-37144746e482","shortId":"dNYLrC","kind":"x402","title":"x402-gated API marketplace on Base with pay-per-request endpoints at $0.02 each in USDC.","tagline":"x402-gated API marketplace on Base with pay-per-request endpoints at $0.02 each in USDC.","description":"lowpaymentfee.com is an x402-protocol API marketplace that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are pay-per-request with no API keys, no rate limits, and no commitments required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/trades/72` is listed as \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required per call is 20,000 base units of USDC (6 decimals), which equals $0.02 USD. The x402 challenge was successfully captured with version 1, confirming the endpoint is live.\n\nThe broader platform advertises categories including metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. Documentation pages exist but appear to require wallet connection to view, so detailed request/response schemas for this specific endpoint are not available from the crawl.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limit","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","trades endpoint","premium data access","crypto payment API"],"warnings":["No request or response schema available — the actual data returned by /api/v1/trades/72 is unknown.","Documentation, pricing, and README pages all require wallet connection and returned no readable content.","The endpoint name 'Premium API Access' is generic and does not describe what trade data or functionality is provided.","The broader site lists many endpoint categories but it is unclear which are actually functional versus placeholder."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/72","protocol":"x402","transport":"http","auth":{"type":"x402","details":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/trades/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documented request/response format for this specific endpoint, and all documentation pages behind wallet-connect gates returned no useful content. The endpoint's actual functionality ('trades/72') is opaque beyond the generic 'Premium API Access' 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'/request':183 '0.02':15,33,132,182 '000':123 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':114 '1':142 '20':122 '6':128 'Base network API' 'USDC API' 'accept':101 'access':99 'advertis':151 'ai/ml':54 'amount':117 'analysi':160 'analyt':53 'api':4,22,43,70,98 'appear':190 'attach':81 'avail':207 'base':7,25,109,124 'base-network' 'broader':149 'call':120 'caller':79 'captur':139 'categori':152 'challeng':136 'classif':163 'commit':77 'confirm':143 'connect':194 'contract':113 'convers':175 'crawl':210 'crypto payment API' 'data':52,57,156 'decim':129 'detail':198 'document':186 'embed':164 'endpoint':13,31,50,62,91,145,204 'equal':131 'estim':172 'exchang':167 'exist':188 'export':157 'feed':166 'finance/web3':56 'gas':171 'gate':3,21 'generat':177 'geocod':173 'header':85 'includ':153 'infer':55 'insight':158 'json-response' 'key':71 'limit':74 'list':95 'live':147 'lowpaymentfee.com':37 'marketplac':5,23,44 'maximum':116 'metric':154 'micropayment API' 'network':110 'no-api-key' 'no-rate-limit' 'offer':46 'page':187 'pay':10,28,65 'pay-per-call API' 'pay-per-request':9,27,64 'payment':84,104 'per':11,29,66,119 'platform':150 'point':185 'post':102 'post-endpoint' 'premium':97 'premium data access' 'price':165,184 'protocol':42 'quot':170 'rate':73,168 'report':155 'request':12,30,67,88,103 'request/response':199 'requir':78,118,192 'schema':200 'sentiment':159 'servic':60 'settl':106 'simpli':80 'span':51 'specif':90,203 'success':138 'summar':162 'text':161 'token':169 'trades endpoint' 'unit':125 'usd':133 'usdc':18,36,112,127 'usdc-settlement' 'use':111 'util':59 'valid':174 'varieti':48 'version':141 'view':196 'wallet':193 'x402':2,20,41,83,135 'x402 API' 'x402-gated':1,19 'x402-payment' 'x402-protocol':40","prices":[{"id":"304cdffa-6299-4bb4-802b-0b15d27d0c10","listingId":"09a369e7-2e4f-4da5-bdd2-37144746e482","amountUsd":null,"unit":"per_call","nativeCurrency":"USD COIN","nativeAmount":"20000","chain":"base","payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","paymentMethod":"x402-usd coin","isPrimary":true,"details":{"scheme":"exact","mime_type":"application/json","accepts_all":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/trades/72","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:02.843Z"}],"sources":[{"listingId":"09a369e7-2e4f-4da5-bdd2-37144746e482","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/72","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:02.843Z","lastSeenAt":"2026-04-26T02:03:12.192Z"}],"details":{"listingId":"09a369e7-2e4f-4da5-bdd2-37144746e482","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/72 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/72"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/72"},{"claim":"The platform offers endpoints in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade data behind a per-request paywall without needing an API key or subscription","Programmatic agents purchasing API responses on-the-fly using USDC on Base","Integrating low-cost data endpoints into workflows where traditional billing is impractical"],"bestFor":["Agents or bots that need keyless, on-demand API access","Developers who prefer pay-per-use over subscriptions","Use cases requiring Base-network USDC micropayments"],"notFor":["Users who need free or ad-supported API access","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.118Z"},"updatedAt":"2026-04-26T02:03:12.192Z"}}