{"id":"88696eb3-2f68-48f3-a720-f8c4d79a0ecd","shortId":"awrNhP","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering 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 endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. Every endpoint is priced at $0.02 per request, settled in USDC on the Base network. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transfers/70` is listed as \"Premium API Access.\" Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts HTTP POST and returns `application/json`. Payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nThe broader platform advertises additional endpoints including 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. However, documentation beyond the landing page is essentially empty (pages return only a \"Connect wallet\" prompt), so the actual behavior and schemas of individual endpoints are not documented.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["llm","data","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all return only 'Connect wallet' with no actual content","No OpenAPI or schema available — request body format and response structure are unknown","The specific purpose of /api/v1/transfers/70 ('Premium API Access') is not explained anywhere","No rate limit or SLA information provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/70","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages beyond the landing page are empty. The purpose of this specific '/transfers/70' endpoint is unclear — 'Premium API Access' is generic. Effectively a stub 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'/request':19,38 '0.02':18,37,70,133,187 '000':122 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':151 '0x8335':127 '20':121 '2913':128 '300':154 '6':137 'accept':141 'access':112 'actual':208 'addit':161 'advertis':116,160 'ai':12,31,57 'ai-inference' 'analysi':165 'analyt':56 'api':5,24,45,83,111 'application/json':146 'attach':94 'base':8,27,78,123,130 'base network api' 'behavior':209 'beyond':192 'broad':50 'broader':158 'call':4,23 'caller':92 'catalog':51 'challeng':115 'classif':168 'classification' 'commit':91 'connect':203 'convers':180 'cost':119 'cover':10,29 'crypto-quotes' 'data':11,30,55 'data-analytics' 'decim':138 'document':191,217 'embed':169 'embeddings' 'empti':198 'enabl':44 'endpoint':16,35,53,66,104,140,162,214 'equal':132 'essenti':197 'estim':177 'everi':65 'exchang':172 'feed':171 'financ':13,32,60 'finance-data' 'gas':176 'generat':182 'geocod':178 'geocoding' 'given':134 'header':98 'howev':190 'http':142 'includ':163 'individu':213 'infrastructur':63 'key':84 'land':194 'learn':59 'limit':87 'list':108 'low payment fee' 'lowpaymentfee.com':39 'machin':58 'maximum':118 'micropayment api' 'minimum':90 'network':79 'no-auth api' 'offer':48 'page':195,199 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':97,147 'per':3,22,71 'platform':6,25,46,159 'point':189 'post':143 'premium':110 'price':68,170,188 'prompt':205 'quot':175 'rate':86,173 'request':72,101 'return':145,200 'schema':211 'second':155 'sent':149 'sentiment':164 'sentiment-analysis' 'settl':73 'simpli':93 'span':54 'specif':103 'summar':167 'text':166 'text-summarization' 'timeout':156 'token':174 'unit':124 'usdc':9,28,75,126,135 'usdc api' 'usdc-base' 'util':15,34,64 'utility-services' 'valid':179 'wallet':204 'web3':61 'x402':43,96,114 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"92207123-2e5e-4bc3-b105-2fe22a1ea2a8","listingId":"88696eb3-2f68-48f3-a720-f8c4d79a0ecd","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:01.460Z"}],"sources":[{"listingId":"88696eb3-2f68-48f3-a720-f8c4d79a0ecd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:01.460Z","lastSeenAt":"2026-04-22T15:02:25.994Z"}],"details":{"listingId":"88696eb3-2f68-48f3-a720-f8c4d79a0ecd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/70 \\\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":"Platform offers endpoints across data, AI, finance, and infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/transfers/70"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/70"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification) without managing API keys","Fetching real-time crypto quotes, gas estimates, or exchange rates via micropayment","Geocoding or data validation as a lightweight utility call in automated workflows","Exporting data or generating analytics reports with per-request billing"],"bestFor":["AI agents needing keyless, pay-per-call access to diverse utility endpoints","Developers prototyping with low-cost, no-commitment API access on Base","Web3-native applications that already hold USDC on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Callers without USDC on Base or unfamiliar with x402 payment protocol"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.394Z"},"updatedAt":"2026-04-22T15:02:25.994Z"}}