{"id":"3f9c4648-483c-40eb-bbde-2a6e40cb5d3e","shortId":"qztZ48","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/ML inference, finance/Web3 data, 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/customers/78` is listed as \"Premium API Access\" and returns `application/json`. 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 POST requests and is discoverable. Payment is sent to wallet 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform also advertises endpoints for 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. Documentation pages exist but appear gated behind a wallet connection, so detailed request/response schemas are not publicly available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-apis"],"categories":["data","llm","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["The specific endpoint path '/api/v1/customers/78' suggests a customer-specific resource but no documentation explains what it returns or what POST body it expects.","All documentation, pricing, and README pages are gated behind wallet connection and contain no public content.","No OpenAPI spec or request/response schema is available; callers must guess at the expected input format.","The broad catalog of endpoints (AI, finance, data, etc.) is advertised but none have been individually verified beyond the landing page listing."],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/78","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/customers/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint works and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and documentation pages are entirely gated behind wallet connection, leaving the actual functionality of /api/v1/customers/78 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'/request':19,38 '0.02':18,37,69,135,190 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':129 '20':123 '2913':130 '300':157 '402 payment api' '6':139 'accept':143 'access':111 'advertis':118,164 'ai':12,31 'ai-inference' 'ai/ml':57 'also':163 'analysi':168 'analyt':56 'api':5,24,45,82,110 'appear':197 'application/json':114 'attach':93 'avail':210 'base':8,27,77,125,132 'base network api' 'behind':199 'broad':50 'broader':161 'call':4,23 'caller':91 'catalog':51 'challeng':117 'classif':171 'classification' 'commit':90 'connect':202 'convers':183 'cost':121 'cover':10,29 'crypto-data' 'data':11,30,55,60 'data-analytics' 'decim':140 'detail':204 'discover':148 'document':193 'embed':172 'embeddings' 'enabl':44 'endpoint':16,35,53,65,103,142,165 'equal':134 'estim':180 'everi':64 'exchang':175 'exist':195 'feed':174 'financ':13,32 'finance-data' 'finance/web3':59 'gas':179 'gate':198 'generat':185 'geocod':181 'geocoding' 'given':136 'header':97 'infer':58 'infrastructur':62 'key':83 'limit':86 'list':107 'low payment fee' 'lowpaymentfee.com':39 'maximum':120 'micropayment api' 'minimum':89 'network':78 'offer':48 'page':194 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':96,149 'per':3,22,70 'platform':6,25,46,162 'point':192 'post':144 'premium':109 'price':67,173,191 'public':209 'quot':178 'rate':85,176 'request':71,100,145 'request/response':205 'return':113 'schema':206 'second':158 'sent':151 'sentiment':167 'sentiment-analysis' 'settl':72 'simpli':92 'span':54 'specif':102 'summar':170 'text':169 'text-summarization' 'timeout':159 'token':177 'unit':126 'usdc':9,28,74,128,137 'usdc api' 'usdc-base' 'util':15,34,63 'utility-apis' 'valid':182 'wallet':153,201 'x402':43,95,116 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2ab7db79-8f88-4381-8ad7-8ea749cfaca5","listingId":"3f9c4648-483c-40eb-bbde-2a6e40cb5d3e","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/customers/78","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:21.939Z"}],"sources":[{"listingId":"3f9c4648-483c-40eb-bbde-2a6e40cb5d3e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/78","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:21.939Z","lastSeenAt":"2026-04-23T21:31:44.831Z"}],"details":{"listingId":"3f9c4648-483c-40eb-bbde-2a6e40cb5d3e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/78 \\\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 at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/customers/78"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/78"}],"useCases":["Agents needing on-demand data analytics or reports without API key provisioning","AI pipelines requiring sentiment analysis, summarization, or embeddings with per-call billing","Fetching real-time crypto token quotes, gas estimates, or exchange rates","Geocoding or data validation as a utility microservice","Demonstrating or testing x402 payment flows on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle USDC payments on Base automatically","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads where $0.02/request adds up quickly without bulk discounts","Users who cannot transact in USDC on the Base network","Applications requiring detailed SLAs, guaranteed uptime, or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.103Z"},"updatedAt":"2026-04-23T21:31:44.831Z"}}