{"id":"3e6796a3-a011-45d8-a70d-31ddaadf7dbf","shortId":"KKvxZk","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 an x402-enabled API platform that offers a variety of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. 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/transfers/13` is listed as \"Premium API Access\" and its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335… on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The broader platform also 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.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/13` endpoint actually does or what input it expects. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API gateway","402 payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/transfers/13 ('Premium API Access') is completely undocumented","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/13","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/transfers/13","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, but there is virtually no documentation — the docs, API, pricing, and README pages are all empty beyond a wallet connect prompt. No OpenAPI schema, no request/response examples, and no description of what '/api/v1/transfers/13' actually returns. The endpoint name 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,63,121,165 '000':111 '0x8335':116 '20':110 '402':220 '402 payment API' '6':125 'Base network API' 'USDC pay-per-call' 'accept':129 'access':101 'account':75 'actual':206 'advertis':106,139 'ai/ml':48 'also':138 'analysi':143 'analyt':47 'api':5,20,37,73,100,174 'application/json':134 'attach':83 'base':8,23,70,112,118 'base-network' 'broader':136 'call':4,19 'caller':81 'challeng':105,221 'classif':146 'connect':183 'content':189 'convers':158 'crypto API gateway' 'data':46,51,229 'decim':126 'descript':200 'doc':173 'document':168,224 'embed':147 'enabl':36 'endpoint':44,56,93,128,140,205,214 'equal':120 'estim':155 'exampl':197 'exchang':150 'expect':212 'extrem':170 'feed':149 'finance/web3':50 'function':231 'gas':154 'generat':160 'geocod':156 'given':122 'header':87 'infer':49 'infrastructur':53 'input':210 'json-response' 'key':74 'limit':78 'list':97 'live':216 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':108 'micropayment API' 'network':9,24,71 'no-api-key' 'offer':40 'openapi':193 'page':178 'pay':2,17,59 'pay-per-cal':1,16 'pay-per-request':58 'payment':86 'per':3,18,60 'platform':6,21,38,137 'point':167 'post':130 'post-method' 'premium':99 'price':148,166,175 'prompt':185 'provid':233 'quot':153 'rate':77,151 'readm':177 'render':180 'request':61,90,131 'request/response':196 'requir':80 'return':133,217 'schema':194 'sentiment':142 'settl':65 'simpli':82 'span':45 'spars':171 'specif':92 'summar':145 'text':144 'token':152 'unclear':227 'unit':113 'usdc':15,30,67,115,123 'usdc-settlement' 'util':54 'valid':157,219 'varieti':42 'via':10,25 'wallet':184 'without':223 'x402':11,26,35,85,104 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d5ba59da-3562-40ee-9637-0d706791fdb3","listingId":"3e6796a3-a011-45d8-a70d-31ddaadf7dbf","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/transfers/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:25.179Z"}],"sources":[{"listingId":"3e6796a3-a011-45d8-a70d-31ddaadf7dbf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:25.179Z","lastSeenAt":"2026-04-23T05:01:49.218Z"}],"details":{"listingId":"3e6796a3-a011-45d8-a70d-31ddaadf7dbf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/13 \\\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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge shows maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/13"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing pay-per-call API services without account registration or API keys","Making programmatic USDC micropayments for API access on Base L2","Agent-driven API consumption with per-request crypto settlement"],"bestFor":["Developers wanting zero-signup API access with crypto payments","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go pricing without subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","Applications requiring free or fiat-only payment methods","High-volume use cases where per-request pricing may add up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.158Z"},"updatedAt":"2026-04-23T05:01:49.218Z"}}