{"id":"01aab021-a77e-43dd-8e51-750eefe61b21","shortId":"9LYNuN","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at /api/v1/payments/226 is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform lists endpoints across four 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, documentation is extremely thin. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no actual technical documentation, request/response schemas, or usage examples. It is unclear what this specific endpoint (/api/v1/payments/226) actually returns or what input it expects beyond a POST request. The endpoint is live and returns a valid x402 402 challenge, but without documentation it is difficult to assess the quality or utility of the data returned.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/226 ('Premium API Access') is undocumented; it is unclear what data or service it provides.","No request body schema or response schema is available; integration requires trial-and-error.","The platform lists many endpoint categories (AI, analytics, finance, infrastructure) but none have documented schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/226","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/payments/226","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no request/response schema, no examples, and the actual functionality of this specific endpoint is unknown. The docs pages are all empty 'Connect wallet' 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'/api/v1/payments/226':57,191 '/docs':161 '/pricing':163 '/readme':165 '/request':13,28,152 '0.02':12,27,74,151 '000':68 '20':67 '402':212 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,88 'across':108 'actual':176,192 'advertis':79 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,81 'assess':221 'attach':91 'base':8,23,51,69 'beyond':199 'broader':104 'call':4,19,76 'categori':110 'challeng':213 'charg':64 'classif':125 'connect':171 'convers':142 'data':111,115,228 'difficult':219 'document':156,178,216 'embed':126 'endpoint':55,107,145,190,204 'estim':136 'exampl':183 'exchang':131 'expect':198 'export':116 'extrem':158 'feed':130 'financ':127 'four':109 'gas':135 'generat':143 'geocod':140 'header':96 'howev':155 'i.e':73 'infrastructur':138 'input':196 'insight':117 'instant':87 'key':82 'label':59 'learn':120 'limit':85 'list':106,147 'live':206 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'network':9,24,52 'no-api-key' 'page':166 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,101 'per':3,18,36,75 'platform':6,21,39,78,105 'point':154 'post':201 'post-endpoint' 'premium':60 'price':129,153 'prompt':173 'proof':102 'protocol':44 'qualiti':223 'quot':134 'rate':84,132 'render':168 'report':114 'request':37,202 'request/response':179 'return':193,208,229 'schema':180 'sentiment':121 'simpli':90 'specif':54,189 'summar':124 'technic':177 'text':123 'thin':159 'token':133 'unclear':186 'unit':70 'usag':182 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':139,225 'valid':99,141,210 'via':10,25 'wallet':172 'web3':128 'without':215 'x':94 'x-payment':93 'x402':11,26,43,100,211 'x402 API' 'x402-payment'","prices":[{"id":"75e06fe3-3566-4a7b-a917-a115297a1b76","listingId":"01aab021-a77e-43dd-8e51-750eefe61b21","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/payments/226","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:57.810Z"}],"sources":[{"listingId":"01aab021-a77e-43dd-8e51-750eefe61b21","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/226","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:57.810Z","lastSeenAt":"2026-04-24T04:03:49.219Z"}],"details":{"listingId":"01aab021-a77e-43dd-8e51-750eefe61b21","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/226 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/226"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.478Z"},"updatedAt":"2026-04-24T04:03:49.219Z"}}