{"id":"d44ae317-da22-494b-b108-96d299b7cbee","shortId":"V2zWjC","kind":"x402","title":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API suite on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or upfront commitments required.\n\nThe specific endpoint listed here (`/api/v1/carts/10`) is described as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is via the x402 exact scheme: callers attach an X-PAYMENT header with a signed payment to the payTo address, and the server fulfills the request upon verification. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises additional endpoint categories 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 per-call price point. Documentation pages beyond the landing page appear to require wallet connection and contain no additional technical detail, so the exact request/response schemas for individual endpoints are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-marketplace","ai","finance","infrastructure"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","low payment fee"],"warnings":["The endpoint path /api/v1/carts/10 does not match any of the documented API categories on the landing page; its actual functionality is unknown.","Documentation, pricing, and README pages all render only 'Connect wallet' with no usable content.","No OpenAPI spec or request/response schemas are available for any endpoint.","The platform advertises many endpoint categories but none have verifiable documentation beyond the landing page listing."],"endpointUrl":"https://lowpaymentfee.com/api/v1/carts/10","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/carts/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema documentation, and all doc pages beyond the landing page only show 'Connect wallet' with no content. The specific purpose of /api/v1/carts/10 is unclear — it doesn't match any of the advertised endpoint 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'/call':19,38 '0.02':18,37,70,120,195 '000':109 '0x8335':114 '20':108 '2913':115 '6':124 'Base network API' 'USDC API' 'accept':158 'access':101 'addit':168,215 'address':147 'advertis':103,167 'ai':12,31 'ai-inference' 'ai/ml':57 'analysi':173 'analyt':56 'api':5,24,45,82,100 'appear':207 'application/json':163 'attach':134 'base':8,27,78,110,117 'beyond':203 'broad':50 'broader':165 'call':198 'caller':133 'categori':170 'classif':176 'collect':51 'commit':88 'connect':211 'contain':213 'convers':188 'cost':106 'data':11,30,55,60 'data-analytics' 'decim':125 'describ':97 'detail':217 'document':201 'embed':177 'enabl':44 'endpoint':16,35,53,66,92,157,169,225 'equal':119 'estim':185 'everi':65 'exact':131,220 'exchang':180 'feed':179 'financ':13,32 'finance-data' 'finance/web3':59 'fulfil':151 'gas':184 'general':62 'generat':190 'geocod':186 'given':121 'header':139 'includ':171 'individu':224 'infer':58 'json-response' 'key':83 'land':205 'limit':85 'list':93 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'maximum':105 'micropayment API' 'network':79 'no-api-key' 'offer':48 'page':202,206 'paid':73 'pay':2,21 'pay-per-call API' 'pay-per-request':1,20 'payment':126,138,143 'payto':146 'per':3,22,71,197 'per-cal':196 'platform':46,166 'point':200 'post':159 'premium':99 'price':68,178,199 'quot':183 'rate':84,181 'request':4,23,72,153,160 'request/response':221 'requir':89,209 'return':162 'schema':222 'scheme':132 'sentiment':172 'server':150 'servic':64 'sign':142 'span':54 'specif':91 'suit':6,25 'summar':175 'technic':216 'text':174 'token':182 'unit':111 'unknown':227 'upfront':87 'upon':154 'usdc':75,113,122 'usdc-base' 'util':15,34,63 'utility-services' 'valid':187 'verif':155 'via':9,28,128 'wallet':210 'x':137 'x-payment':136 'x402':10,29,43,130 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"261793c1-73b0-4e51-ab4a-847e02ff619c","listingId":"d44ae317-da22-494b-b108-96d299b7cbee","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/carts/10","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:10.457Z"}],"sources":[{"listingId":"d44ae317-da22-494b-b108-96d299b7cbee","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/carts/10","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:10.457Z","lastSeenAt":"2026-04-22T20:00:43.083Z"}],"details":{"listingId":"d44ae317-da22-494b-b108-96d299b7cbee","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/carts/10 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment in USDC on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/carts/10"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data or crypto gas estimates with per-call payment","Running geocoding, validation, or data conversion tasks without subscription overhead","Exporting analytics data or generating insights reports on a pay-as-you-go basis"],"bestFor":["AI agents needing keyless, pay-per-use access to diverse API endpoints","Developers who want to avoid subscription commitments for low-volume API usage","Web3-native applications that can pay in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, rate-limit guarantees, or enterprise support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.722Z"},"updatedAt":"2026-04-22T20:00:43.083Z"}}