{"id":"0e0e196f-1d35-4516-b26c-66fe7995abac","shortId":"MFHBuS","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/keys/31` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or subscriptions are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific endpoint being listed here (`/api/v1/keys/31`) does not clearly map to any of the named endpoints on the site. Its description is simply \"Premium API Access,\" and no documentation, request/response schema, or usage examples are available. The crawled docs pages (/api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation it is unclear what this particular endpoint returns or what input it expects beyond a POST request.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation available for /api/v1/keys/31 — purpose and expected input/output are unknown","All documentation pages (/api, /pricing, /README) returned only a 'Connect wallet' prompt with no content","The endpoint path '/api/v1/keys/31' does not match any of the named endpoints listed on the homepage","No OpenAPI spec, no AI plugin manifest, no robots.txt, no agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/31","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/keys/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no documentation for this specific endpoint, no request/response schema, no examples, and the purpose of /api/v1/keys/31 is ambiguous. The crawled doc pages were empty. This is effectively a stub 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'/api/v1/keys/31':69,178 '/pricing':214 '/readme':215 '/request':19,38,168 '0.02':18,37,80,167 '000':84 '20':83 '6':90 'access':75,198 'account':102 'advertis':123 'ai':12,31,134 'analysi':138 'analyt':128 'api':5,24,45,74,100,197 'attach':109 'avail':208 'base':8,27,63,85 'base network api' 'base-network' 'beyond':243 'broad':50 'call':4,23,82 'caller':107 'catalog':51 'categori':126 'classif':141 'clear':181 'connect':220 'content':226 'convers':158 'cost':77 'crawl':210 'data':11,30,127,131 'decim':91 'descript':193 'doc':211 'document':201,229 'embed':142 'enabl':44 'endpoint':16,35,57,67,125,161,174,188,236 'estim':152 'exampl':206 'exchang':147 'expect':242 'export':132 'feed':146 'financ':13,32,143 'four':124 'gas':151 'generat':159 'geocod':156 'handl':94 'header':114 'howev':171 'http-post' 'infrastructur':154 'input':240 'insight':133 'key':101 'learn':136 'list':71,163,176 'low payment fee' 'lowpaymentfee.com':39 'machin':135 'map':182 'metric':129 'micropayment api' 'name':187 'network':64 'no-api-key' 'offer':10,29 'page':212 'particular':235 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':92,113,118 'per':3,22,55,81 'platform':6,25,46,122 'point':170 'post':245 'premium':73,196 'premium api access' 'price':145,169 'prompt':222 'proof':119 'protocol':98 'provid':48 'quot':150 'rate':148 'report':130 'request':56,246 'request/response':202 'requir':106 'return':217,237 'schema':203 'sentiment':137 'settl':58 'simpli':108,195 'site':191 'specif':66,173 'subscript':104 'substant':225 'summar':140 'text':139 'token':149 'unclear':232 'unit':86 'usag':205 'usdc':9,28,60,88 'usdc api' 'usdc-settlement' 'util':15,34,155 'valid':117,157 'via':95 'wallet':221 'web3':144 'wider':121 'without':227 'x':112 'x-payment':111 'x402':43,97 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ac349677-b62f-4278-a094-8e801dda552b","listingId":"0e0e196f-1d35-4516-b26c-66fe7995abac","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/keys/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.219Z"}],"sources":[{"listingId":"0e0e196f-1d35-4516-b26c-66fe7995abac","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.219Z","lastSeenAt":"2026-04-22T05:32:11.922Z"}],"details":{"listingId":"0e0e196f-1d35-4516-b26c-66fe7995abac","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/31 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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","source_url":"https://lowpaymentfee.com/api/v1/keys/31"},{"claim":"All listed 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":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/31"}],"useCases":["Programmatic access to paid API endpoints without needing an account or API key","Agent-driven workflows that need to pay for API calls on-the-fly using USDC on Base","Accessing premium data or utility services with per-request micropayments"],"bestFor":["Developers or agents who want zero-signup, pay-as-you-go API access","Use cases requiring micropayment-settled API calls on Base L2","Scenarios where avoiding API key management is desirable"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 may not be cost-effective compared to subscription APIs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.146Z"},"updatedAt":"2026-04-22T05:32:11.922Z"}}