{"id":"07a6c4ca-9f92-43db-8cd2-6f66663cb030","shortId":"amVaUm","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled 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 at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/products/80` is listed as \"Premium API Access\" and returns `application/json`. The x402 challenge indicates a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. Payment is made to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme with a 300-second timeout.\n\nThe broader platform advertises endpoints for 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 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual input/output schemas, supported parameters, and response formats for any of these endpoints are unknown. The `/api/v1/products/80` endpoint specifically lacks any description of what \"Premium API Access\" actually returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","json-response","no-api-key","no-rate-limit"],"categories":["general","api-marketplace"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api marketplace","402 payment api"],"warnings":["No documentation available — all sub-pages (docs, api, pricing, README) return only 'Connect wallet'","The purpose and response format of /api/v1/products/80 ('Premium API Access') is completely undocumented","No OpenAPI spec or input/output schema provided","Cannot verify what data or service this endpoint actually delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/80","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/products/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no description of what this specific endpoint actually returns, and all doc/pricing/API pages are empty beyond a 'Connect wallet' prompt. The listing is effectively a stub with unknown 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'/call':13,28 '0.02':12,27,63,123,173 '000':113 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':134 '0x8335':118 '20':112 '300':141 '402 payment api' '6':127 'access':101,221 'account':75 'actual':195,222 'address':133 'advertis':147 'ai/ml':48 'analysi':151 'analyt':47 'api':5,20,37,73,100,220 'application/json':104 'attach':83 'base':8,23,70,114,120 'base usdc api' 'base-network' 'beyond':178 'broader':145 'caller':81 'challeng':107 'classif':154 'connect':191 'convers':166 'crypto api marketplace' 'data':46,51 'decim':128 'descript':216 'document':177 'embed':155 'empti':184 'enabl':36 'endpoint':44,56,93,148,207,212 'equal':122 'essenti':183 'estim':163 'exact':137 'exchang':158 'feed':157 'finance/web3':50 'format':202 'gas':162 'generat':168 'geocod':164 'given':124 'header':87 'howev':176 'indic':108 'infer':49 'input/output':196 'json-response' 'key':74 'lack':214 'land':180 'limit':78 'list':97 'low payment fee' 'lowpaymentfee.com':31 'made':131 'marketplac':38 'maxamountrequir':110 'micropayment api' 'network':9,24,71 'no-api-key' 'no-rate-limit' 'offer':40 'page':181,188 'paramet':199 'pay':2,17,59 'pay per call api' 'pay-per-request':1,16,58 'payment':86,129 'per':3,18,60 'platform':6,21,146 'point':175 'premium':99,219 'price':156,174 'quot':161 'rate':77,159 'request':4,19,61,90 'requir':80 'respons':201 'return':103,223 'schema':197 'scheme':138 'second':142 'sentiment':150 'servic':54 'settl':65 'show':190 'simpli':82 'span':45 'specif':92,213 'sub':187 'sub-pag':186 'summar':153 'support':198 'text':152 'timeout':143 'token':160 'unit':115 'unknown':209 'usdc':15,30,67,117,125 'usdc-settlement' 'use':135 'util':53 'valid':165 'varieti':42 'via':10,25 'wallet':192 'x402':11,26,35,85,106 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"3ddc63cc-f48f-4539-9517-0b984a70eb80","listingId":"07a6c4ca-9f92-43db-8cd2-6f66663cb030","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/products/80","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:05.291Z"}],"sources":[{"listingId":"07a6c4ca-9f92-43db-8cd2-6f66663cb030","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/80","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:05.291Z","lastSeenAt":"2026-04-22T13:30:32.813Z"}],"details":{"listingId":"07a6c4ca-9f92-43db-8cd2-6f66663cb030","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/80 \\\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":"All endpoints 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":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/products/80"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to various utility and data endpoints with crypto micropayments","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers wanting zero-friction API access with no signup","AI agents that can settle x402 payments autonomously on Base","Users who prefer pay-as-you-go pricing with no commitments"],"notFor":["Users who need detailed API documentation and well-defined schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:45.954Z"},"updatedAt":"2026-04-22T13:30:32.813Z"}}