{"id":"5debe866-57f5-49bf-890e-3058291c4a05","shortId":"yFbWew","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe specific endpoint at `/api/v1/transfers/26` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The platform also offers 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 detailed description of what the `/api/v1/transfers/26` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" provides beyond the generic label.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base-network","no-api-key","post-endpoint","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay per call API","USDC micropayment API","Base network API","lowpaymentfee","crypto pay-per-use API","402 payment API"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of '/api/v1/transfers/26' ('Premium API Access') is completely undocumented","Cannot verify what data or functionality this specific endpoint provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/26","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/26","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 documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' at /api/v1/transfers/26 actually does. The listing is effectively a 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'/request':13,30 '0.02':12,29,68,140,175 '000':129 '0x8335':134 '20':128 '2913':135 '402':226 '402 payment API' '6':144 'Base network API' 'USDC micropayment API' 'accept':118 'access':116,240 'across':54 'actual':217 'advertis':124 'ai/ml':57 'also':148 'analysi':153 'analyt':56 'api':5,15,22,32,41,84,115,184,239 'attach':95 'base':8,25,76,130,137 'beyond':242 'broad':46 'call':4,21 'caller':93 'catalog':47 'challeng':123,227 'classif':156 'commit':90 'connect':193 'content':199 'convers':168 'crypto pay-per-use API' 'data':55,235 'decim':145 'descript':211 'detail':210 'doc':183 'document':178,230 'embed':157 'enabl':40 'endpoint':53,64,108,150,216,220 'equal':139 'estim':165 'exampl':207 'exchang':160 'extrem':180 'feed':159 'finance/web3':59 'function':237 'gas':164 'generat':170 'generic':244 'geocod':166 'given':141 'header':100 'infer':58 'infrastructur':61 'json-response' 'key':16,33,85 'label':245 'limit':87 'list':112 'live':222 'lowpaymentfee' 'lowpaymentfee.com':35 'maxamountrequir':126 'network':9,26,77 'no-api-key' 'offer':44,149 'openapi':203 'page':188 'paid':71 'pay':2,19,50 'pay per call API' 'pay-per-cal':1,18 'pay-per-request':49 'payment':81,99,104 'per':3,20,51,69 'platform':6,23,42,147 'point':177 'post':119 'post-endpoint' 'premium':114,238 'price':66,158,176,185 'prompt':195 'proof':105 'proper':225 'protocol':82 'provid':241 'quot':163 'rate':86,161 'readm':187 'render':190 'request':52,70,120 'request/response':206 'requir':17,34,92 'return':218,223 'schema':204 'sentiment':152 'simpli':94 'spars':181 'specif':107 'summar':155 'text':154 'token':162 'unclear':233 'unit':131 'upfront':89 'usdc':73,133,142 'usdc-base-network' 'use':78 'util':62 'valid':103,167 'via':10,27 'wallet':194 'without':229 'x':98 'x-payment':97 'x402':11,28,39,80,122 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"35c58505-2573-4838-9e59-7f56d3290ec2","listingId":"5debe866-57f5-49bf-890e-3058291c4a05","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:45.843Z"}],"sources":[{"listingId":"5debe866-57f5-49bf-890e-3058291c4a05","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:45.843Z","lastSeenAt":"2026-04-23T00:32:30.432Z"}],"details":{"listingId":"5debe866-57f5-49bf-890e-3058291c4a05","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/26 \\\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":"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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/26"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without managing API keys or subscriptions","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-request endpoints into autonomous agent workflows"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","Applications requiring guaranteed SLAs or enterprise support","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.2Z"},"updatedAt":"2026-04-23T00:32:30.432Z"}}