{"id":"8b47665b-a3e3-495a-a5ac-55a9eead7072","shortId":"DZrFnC","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/item/19` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 listed at the same $0.02/request price point and settle in USDC on Base.\n\nThe endpoint at `/api/v1/item/19` does not appear in the site's public navigation, which lists specific named endpoints. Its generic \"Premium API Access\" label and numeric item ID suggest it may be a catalog entry or a catch-all item rather than a domain-specific service. No request/response schema documentation was found beyond the x402 challenge's outputSchema indicating it accepts HTTP POST. The docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-marketplace","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment required"],"warnings":["No request or response schema documentation available for /api/v1/item/19","The endpoint path does not appear in the site's public API listing — its actual functionality is unclear","All documentation pages (docs, pricing, API, README) rendered only 'Connect wallet' with no content","Generic 'Premium API Access' label provides no indication of what data or service is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/19","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/item/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no documentation for this specific endpoint's request/response schema, no examples, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The endpoint path (/api/v1/item/19) is not listed in the site's public catalog, making its actual functionality 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'/request':13,30,149 '0.02':12,29,69,148 '000':73 '20':72 '402 payment required' '6':79 'accept':50,220 'access':66,180 'account':84 'across':105 'addit':238 'advertis':89 'ai':115 'analysi':119 'analyt':109 'api':5,15,22,32,42,65,82,179,227 'appear':164 'attach':92 'base':8,25,55,74,157 'base network api' 'beyond':212 'broader':101 'call':4,21,71 'caller':90 'catalog':191 'catch':196 'catch-al':195 'categori':107 'challeng':215 'classif':122 'connect':233 'content':239 'convers':139 'cost':68 'data':108,112 'decim':80 'doc':224 'document':209 'domain':203 'domain-specif':202 'embed':123 'endpoint':59,104,142,159,175 'entri':192 'estim':133 'exchang':128 'export':113 'feed':127 'financ':124 'found':211 'four':106 'gas':132 'generat':140 'generic':177 'geocod':137 'header':96 'http':221 'http-post' 'id':185 'indic':218 'infrastructur':135 'insight':114 'item':184,198 'key':16,33,83 'label':181 'learn':117 'limit':87 'list':62,144,172 'low payment fee' 'lowpaymentfee.com':35 'machin':116 'may':188 'metric':110 'micropayment api' 'name':174 'navig':170 'network':56 'no-api-key' 'numer':183 'offer':103 'outputschema':217 'page':228 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,95 'per':3,20,40,70 'platform':6,23,43,102 'point':151 'post':222 'premium':64,178 'price':126,150,225 'prompt':235 'protocol':48 'public':169 'quot':131 'rate':86,129 'rather':199 'render':230 'report':111 'request':41,99 'request/response':207 'requir':17,34 'schema':208 'sentiment':118 'servic':205 'settl':153 'simpli':91 'site':167 'specif':58,173,204 'suggest':186 'summar':121 'text':120 'token':130 'unit':75 'usdc':9,26,51,77,155 'usdc api' 'usdc-base' 'use':45 'util':136 'valid':138 'via':10,27 'wallet':234 'web3':125 'x402':11,28,47,94,214 'x402 api' 'x402-payment'","prices":[{"id":"b27883e6-95e9-4f9f-8e15-c1e1cc85ad14","listingId":"8b47665b-a3e3-495a-a5ac-55a9eead7072","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/item/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:42.317Z"}],"sources":[{"listingId":"8b47665b-a3e3-495a-a5ac-55a9eead7072","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:42.317Z","lastSeenAt":"2026-04-23T09:00:47.057Z"}],"details":{"listingId":"8b47665b-a3e3-495a-a5ac-55a9eead7072","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/19 \\\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 with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/19"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need on-demand endpoint access settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or sporadic API consumption where subscriptions are wasteful"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:40.997Z"},"updatedAt":"2026-04-23T09:00:47.057Z"}}