{"id":"19228e3d-a830-4563-ac02-614e89a6e287","shortId":"FLAxPW","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/transfers/63` is labeled \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider platform advertises four endpoint 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (`/api/v1/transfers/63`) does not clearly map to any of these documented categories — its name \"Premium API Access\" is generic and its actual functionality is not documented.\n\nThe platform's documentation pages (`/docs`, `/api`, `/pricing`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so there is no schema documentation, request/response examples, or detailed feature descriptions available beyond the landing page overview.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["The specific endpoint /api/v1/transfers/63 ('Premium API Access') does not correspond to any documented API category on the landing page — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) returned no substantive content, only a 'Connect wallet' prompt.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The platform lists many endpoint categories on its landing page but none have detailed documentation — treat advertised capabilities with caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/63","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/transfers/63 is undocumented. All doc pages return only 'Connect wallet' with no content. No request/response schema, no examples, and the endpoint name is generic. Effectively a stub 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'/api/v1/transfers/63':69,176 '/docs':206 '/pricing':208 '/readme':209 '/request':19,38,167 '0.02':18,37,79,166 '000':83 '20':82 '6':89 'Base network API' 'USDC API' 'access':74,191 'account':101 'actual':196 'advertis':123 'ai':12,31,134 'analysi':138 'analyt':128 'api':5,24,45,73,99,190 'attach':109 'avail':233 'base':8,27,63,84 'base-network' 'beyond':234 'broad':50 'call':4,23,81 'caller':107 'catalog':51 'categori':126,186 'classif':141 'clear':179 'connect':214 'content':220 'convers':158 'cost':76 'crypto-paid API' 'data':11,30,127,131 'decim':90 'descript':232 'detail':230 'document':185,200,204,226 'embed':142 'enabl':44 'endpoint':16,35,57,67,125,162,172 'estim':152 'exampl':228 'exchang':147 'export':132 'featur':231 'feed':146 'financ':13,32,143 'four':124 'function':197 'gas':151 'generat':159 'generic':193 'geocod':156 'handl':93 'header':114 'howev':169 'http-post' 'infrastructur':154 'insight':133 'key':100 'label':71 'land':236 'learn':136 'limit':104 'list':161,174 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'map':180 'metric':129 'micropayment API' 'name':188 'network':64 'no-api-key' 'offer':10,29 'overview':238 'page':205,237 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':91,113,118 'per':3,22,55,80 'platform':6,25,46,122,202 'premium':72,189 'price':145,168 'prompt':216 'proof':119 'protocol':97 'provid':48 'quot':150 'rate':103,148 'report':130 'request':56 'request/response':227 'requir':106 'return':211 'schema':225 'sentiment':137 'settl':58 'share':163 'simpli':108 'specif':66,171 'substant':219 'summar':140 'text':139 'token':149 'unit':85 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,155 'valid':117,157 'via':94 'wallet':215 'web3':144 'wider':121 'x':112 'x-payment':111 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"ddfadbdb-7453-4991-91a2-e94dc3a22440","listingId":"19228e3d-a830-4563-ac02-614e89a6e287","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:52.366Z"}],"sources":[{"listingId":"19228e3d-a830-4563-ac02-614e89a6e287","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:52.366Z","lastSeenAt":"2026-04-22T04:02:12.515Z"}],"details":{"listingId":"19228e3d-a830-4563-ac02-614e89a6e287","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/63 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/63"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/63"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Four endpoint categories listed: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages return only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need on-demand API access without pre-registration or API keys","Programmatic access to utility/data endpoints with per-call USDC micropayments","Integrating pay-as-you-go services into crypto-native workflows"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with USDC wallets on Base that need ad-hoc endpoint calls","Projects exploring x402 protocol integrations"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing at $0.02 would be cost-prohibitive compared to subscription APIs","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.857Z"},"updatedAt":"2026-04-22T04:02:12.515Z"}}