{"id":"a86ca219-cd77-4f08-a6c4-7f69fa434b67","shortId":"3FmgDS","kind":"x402","title":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","tagline":"Pay-per-call API suite on Base (USDC) covering analytics, AI, finance, and utilities at $0.02/request.","description":"lowpaymentfee.com offers a collection of x402-enabled API endpoints settled in USDC on the Base network. Each call costs $0.02 (20,000 base units of USDC with 6 decimals) and requires no API keys, accounts, or rate-limit negotiations — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/resource/32` is listed as \"Premium API Access\" but its exact functionality is not documented beyond the generic description. The broader platform advertises four endpoint families: 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 share the same $0.02 per-request pricing.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The method is POST and the response MIME type is `application/json`. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-marketplace","misc"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["The exact functionality of /api/resource/32 is undocumented; 'Premium API Access' is the only description available.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, input schema, or response examples are available.","The broader platform lists many endpoint families but it is unclear whether /api/resource/32 maps to any of them."],"endpointUrl":"https://lowpaymentfee.com/api/resource/32","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/resource/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific resource at /api/resource/32 has no documented purpose, no input/output schema, and no example requests or responses. The docs, pricing, and README pages are all blank beyond a wallet-connect prompt. The listing is effectively a stub with confirmed 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'/request':18,36 '0.02':17,35,57,155 '000':59 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':182 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':185 '20':58 '402':171 '402 payment required' '6':65 'access':98 'account':72 'addit':221 'address':181 'advertis':113 'ai':12,30,124 'analysi':128 'analyt':11,29,118 'api':5,23,45,70,97,207 'application/json':196 'attach':80 'base':8,26,52,60,177 'base network api' 'beyond':106,198 'broader':111 'call':4,22,55 'caller':78 'challeng':169 'classif':131 'collect':40 'connect':216 'content':222 'convers':148 'cost':56 'cover':10,28 'data':117,121 'decim':66 'descript':109 'doc':206 'document':105,197 'embed':132 'enabl':44 'endpoint':46,90,115,151,161 'estim':142 'exact':101,174 'exchang':137 'export':122 'extrem':203 'famili':116 'feed':136 'financ':13,31,133 'four':114 'function':102 'gas':141 'generat':149 'generic':108 'geocod':146 'header':84 'http':170 'infrastructur':144 'insight':123 'json-response' 'key':71 'land':200 'learn':126 'limit':76 'list':94 'live':163 'low payment fee' 'lowpaymentfee.com':37 'machin':125 'method':187 'metric':119 'micropayment api' 'mime':193 'negoti':77 'network':53,178 'no-api-key' 'offer':38 'page':201,211 'pay':2,20,179 'pay per call api' 'pay-per-cal':1,19 'pay-per-request' 'payment':83 'per':3,21,157 'per-request':156 'platform':112 'post':189 'post-method' 'premium':96 'price':135,159,208 'prompt':218 'quot':140 'rate':75,138 'rate-limit':74 'readm':210 'render':213 'report':120 'request':87,158 'requir':68 'respons':192 'return':165 'scheme':173 'sentiment':127 'settl':47 'share':152 'simpli':79 'spars':204 'specif':89 'suit':6,24 'summar':130 'text':129 'token':139 'type':194 'unit':61 'usdc':9,27,49,63,184 'usdc api' 'usdc-base' 'use':183 'util':15,33,145 'valid':147,167 'wallet':217 'web3':134 'x402':43,82,168 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"4d56dc83-b705-4dd6-8271-8427c2ffbb59","listingId":"a86ca219-cd77-4f08-a6c4-7f69fa434b67","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/resource/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:07.290Z"}],"sources":[{"listingId":"a86ca219-cd77-4f08-a6c4-7f69fa434b67","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:07.290Z","lastSeenAt":"2026-04-22T13:30:18.554Z"}],"details":{"listingId":"a86ca219-cd77-4f08-a6c4-7f69fa434b67","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/32 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge on Base network using USDC","source_url":"https://lowpaymentfee.com/api/resource/32"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/resource/32"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/resource/32"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API resources with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic consumption of analytics, AI inference, finance data, or utility endpoints without subscription commitments"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime","Users who need detailed API documentation or OpenAPI schemas before integrating","Callers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:01:13.917Z"},"updatedAt":"2026-04-22T13:30:18.554Z"}}