{"id":"4f98af64-307f-40dd-802f-b5db58a90df6","shortId":"r4xwd8","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 `/api/v1/transfers/168` is listed as \"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 offers 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 $0.02 per request. However, the specific endpoint probed here (`/api/v1/transfers/168`) does not clearly map to any of these advertised categories and is simply described as \"Premium API Access\" with no further documentation on what 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/168` endpoint actually does. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what data or service it provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The endpoint path '/api/v1/transfers/168' does not match any of the advertised API categories on the landing page; its actual function is unknown.","No OpenAPI schema or response examples are provided anywhere.","No robots.txt or agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/168","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, but there is zero documentation on what the /transfers/168 endpoint actually returns. No OpenAPI schema, no request/response examples, and the docs pages are empty. The endpoint's purpose is entirely 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'/api/v1/transfers/168':56,164 '/docs':196 '/pricing':198 '/readme':200 '/request':13,28 '/transfers/168':227 '0.02':12,27,78,155 '000':72 '20':71 '402':66 '402 payment API' '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97,182 'across':114 'actual':229 'advertis':88,173 'ai':124 'analysi':128 'analyt':118 'api':5,20,38,61,90,181 'attach':100 'base':8,23,51,73 'broader':109 'call':4,19,85 'categori':116,174 'challeng':67,241 'classif':131 'clear':167 'connect':206 'content':212 'convers':148 'data':117,121,249 'decim':83 'describ':178 'descript':223 'document':186,191,244 'embed':132 'endpoint':55,113,151,161,228,232 'estim':142 'exampl':220 'exchang':137 'export':122 'extrem':193 'feed':136 'financ':133 'four':115 'gas':141 'generat':149 'geocod':146 'given':79 'header':104 'howev':158 'http-post' 'i.e':77 'infrastructur':144 'insight':123 'instant':96 'key':91 'learn':126 'limit':94 'list':58,153 'live':234 'lowpaymentfee' 'lowpaymentfee.com':31,110 'machin':125 'map':168 'metric':119 'network':9,24,52 'no-api-key' 'offer':112 'openapi':216 'page':201 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,103 'per':3,18,36,84,156 'platform':6,21,39,87 'premium':60,180 'price':135 'probe':162 'prompt':208 'protocol':44 'provid':253 'quot':140 'rate':93,138 'render':203 'report':120 'request':37,68,107,157 'request/response':219 'respond':236 'return':64,190 'schema':217 'sentiment':127 'servic':251 'simpli':99,177 'site':111 'spars':194 'specif':54,160 'substant':211 'summar':130 'text':129 'token':139 'unclear':247 'unit':74 'usdc':15,30,47,76,80 'usdc-base-network' 'use':41 'util':145 'valid':147,239 'via':10,25 'wallet':207 'web3':134 'without':243 'x402':11,26,43,102,240 'x402 API' 'x402-payment'","prices":[{"id":"87a0247f-7aeb-4959-9059-0736ad0218a5","listingId":"4f98af64-307f-40dd-802f-b5db58a90df6","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/168","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:32.526Z"}],"sources":[{"listingId":"4f98af64-307f-40dd-802f-b5db58a90df6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/168","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:32.526Z","lastSeenAt":"2026-04-23T04:02:06.258Z"}],"details":{"listingId":"4f98af64-307f-40dd-802f-b5db58a90df6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/168 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transfers/168"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"The /docs, /api, /pricing, and /README pages render only a 'Connect wallet' prompt.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","Anyone without a Base-network USDC wallet","High-volume use cases where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.807Z"},"updatedAt":"2026-04-23T04:02:06.258Z"}}