{"id":"688f128b-576b-4d58-bfee-bd3cbaf8b955","shortId":"uy5YTw","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/transfers/161` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com site lists multiple API categories including 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. However, the specific endpoint being listed here (`/api/v1/transfers/161`) is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/transfers/161` endpoint actually does. The endpoint is confirmed live (402 challenge captured), but the lack of documentation makes it difficult to determine its purpose or output format.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all render only 'Connect wallet'","The purpose and response format of /api/v1/transfers/161 ('Premium API Access') is completely undocumented","No OpenAPI schema or request/response examples provided","Cannot verify what data or service this endpoint delivers"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/161","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge, but there is zero documentation on what /api/v1/transfers/161 actually returns. No OpenAPI schema, no request/response examples, and all doc pages show only 'Connect wallet'. The purpose of this specific endpoint is 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'/api/v1/transfers/161':57,168 '/docs':192 '/pricing':194 '/readme':196 '/request':13,28,158 '/transfers/161':223 '0.02':12,27,78,157 '000':72 '20':71 '402':66,232 '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97,175 'actual':225 'advertis':88 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,61,90,114,174 'attach':100 'base':8,23,51,73 'broader':109 'call':4,19,85 'captur':234 'categori':115 'challeng':67,233 'classif':131 'confirm':230 'connect':202 'content':208 'convers':148 'crypto-paid API' 'data':117,121,182 'decim':83 'describ':170 'descript':219 'determin':244 'difficult':242 'document':179,187,239 'embed':132 'endpoint':55,151,164,224,228 'estim':142 'exampl':216 'exchang':137 'export':122 'extrem':189 'feed':136 'financ':133 'format':249 'function':184 'gas':141 'generat':149 'geocod':146 'given':79 'header':104 'howev':161 'http-post' 'i.e':77 'includ':116 'infrastructur':144 'insight':123 'instant':96 'key':91 'label':59 'lack':237 'learn':126 'limit':94 'list':112,153,166 'live':231 'lowpaymentfee' 'lowpaymentfee.com':31,110 'machin':125 'make':240 'metric':119 'multipl':113 'network':9,24,52 'no-api-key' 'openapi':212 'output':248 'page':197 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,103 'per':3,18,36,84 'platform':6,21,39,87 'point':160 'premium':60,173 'premium API access' 'price':135,159 'prompt':204 'protocol':44 'purpos':246 'quot':140 'rate':93,138 'render':199 'report':120 'request':37,68,107 'request/response':215 'return':64,186 'schema':213 'sentiment':127 'simpli':99 'site':111 'spars':190 'specif':54,163 'substant':207 'summar':130 'text':129 'token':139 'unit':74 'usdc':15,30,47,76,80 'usdc-base-network' 'use':41 'util':145 'valid':147 'via':10,25 'wallet':203 'web3':134 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"5fdac39f-fcd3-4da8-a02d-9c3f81f541b3","listingId":"688f128b-576b-4d58-bfee-bd3cbaf8b955","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:30.675Z"}],"sources":[{"listingId":"688f128b-576b-4d58-bfee-bd3cbaf8b955","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:30.675Z","lastSeenAt":"2026-04-22T04:02:11.097Z"}],"details":{"listingId":"688f128b-576b-4d58-bfee-bd3cbaf8b955","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/161 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/161"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/161"},{"claim":"The site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing a pay-per-request API endpoint without needing API keys or subscriptions","Making USDC micropayments on Base for individual API calls","Programmatic agent-driven API consumption via x402 protocol"],"bestFor":["Developers wanting keyless, pay-as-you-go 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 before integrating","Applications requiring guaranteed SLAs or support contracts","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.885Z"},"updatedAt":"2026-04-22T04:02:11.097Z"}}