{"id":"c0a882c8-6422-47b1-a2f4-2b5ab28ddbd3","shortId":"MeD5xT","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/transfers/139` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…0913 on Base), which equals $0.02. Payment is made via the x402 exact scheme with no API keys or rate limits required. The platform advertises instant access with no minimums or commitments.\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 spec, no request/response schema documentation, and no examples of what the `/api/v1/transfers/139` endpoint actually returns. The endpoint name \"Premium API Access\" and path segment \"transfers/139\" do not clearly indicate what data or functionality is provided, making it difficult to determine the actual use case without making a paid request.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","pay per call API","USDC API","Base network API","micropayment API"],"warnings":["The specific endpoint /api/v1/transfers/139 is labeled 'Premium API Access' but its actual functionality is undocumented and unclear from the path alone.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available — callers cannot know what to send or what they will receive.","The endpoint path 'transfers/139' does not match any of the advertised API categories on the landing page, raising questions about what it actually does."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/139","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/139","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, confirming it accepts USDC payments on Base. However, there is no documentation, no OpenAPI spec, no request/response examples, and the endpoint's actual functionality (\"Premium API Access\" at /transfers/139) is entirely opaque. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/transfers/139':113,204 '/docs':172 '/pricing':174 '/readme':176 '/request':19,38 '0.02':18,37,99,140 '000':129 '0913':135 '0x8335':134 '20':128 '402':123 'Base network API' 'USDC API' 'access':119,161,213 'across':58 'actual':206,234 'advertis':159 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,118,151,212 'base':8,27,107,130,137 'broad':50 'call':4,23 'case':236 'catalog':51 'categori':60 'challeng':124 'classif':75 'clear':220 'commit':166 'connect':182 'content':188 'convers':92 'data':11,30,61,65,223 'determin':232 'difficult':230 'document':167,197 'embed':76 'enabl':44 'endpoint':16,35,57,95,111,205,209 'equal':139 'estim':86 'exact':147 'exampl':200 'exchang':81 'export':66 'extrem':169 'feed':80 'financ':13,32,77 'four':59 'function':225 'gas':85 'generat':93 'geocod':90 'indic':221 'infrastructur':88 'insight':67 'instant':160 'json-response' 'key':152 'learn':70 'limit':155 'list':115 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'made':143 'make':228,238 'metric':63 'micropayment API' 'minimum':164 'name':210 'network':108 'no-api-key' 'no-rate-limit' 'offer':48 'openapi':192 'page':177 'paid':102,240 'path':215 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':141 'per':3,22,55,100 'platform':6,25,46,158 'premium':117,211 'price':79,97 'prompt':184 'provid':227 'quot':84 'rate':82,154 'render':179 'report':64 'request':56,101,125,241 'request/response':195 'requir':156 'return':121,207 'schema':196 'scheme':148 'segment':216 'sentiment':71 'spars':170 'spec':193 'specif':110 'summar':74 'text':73 'token':83 'transfers/139':217 'unit':131 'usdc':104,133 'usdc-base' 'use':235 'util':15,34,89 'valid':91 'via':9,28,144 'wallet':183 'web3':78 'without':237 'x402':10,29,43,146 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f33dab48-4054-4c06-a4c5-ab7f0c8f58a2","listingId":"c0a882c8-6422-47b1-a2f4-2b5ab28ddbd3","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/139","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:33.152Z"}],"sources":[{"listingId":"c0a882c8-6422-47b1-a2f4-2b5ab28ddbd3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/139","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:33.152Z","lastSeenAt":"2026-04-23T03:32:01.706Z"}],"details":{"listingId":"c0a882c8-6422-47b1-a2f4-2b5ab28ddbd3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/139 \\\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 on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/transfers/139"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, no minimums, and no commitments.","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no further content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API endpoints without subscription or API key management","Making micropayments for individual API requests using USDC on Base","Agent-driven API consumption where per-call billing is preferred over subscriptions"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native billing without account registration"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.771Z"},"updatedAt":"2026-04-23T03:32:01.706Z"}}