{"id":"c1f7f2bf-fbc8-4fa1-9ce1-0c4a7315c553","shortId":"5dfMGJ","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","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/32` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you 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 priced at $0.02 per request.\n\nThis particular endpoint (`/api/v1/item/32`) does not appear in the site's publicly listed catalog of named endpoints, so its exact functionality is unclear. The description simply says \"Premium API Access\" with no further documentation. The docs, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without an OpenAPI schema, request/response examples, or detailed documentation, the actual behavior of this endpoint remains unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee","402 payment api"],"warnings":["The endpoint /api/v1/item/32 is not listed among the site's publicly documented endpoints — its actual functionality is unknown.","No OpenAPI schema, request examples, or response examples are available.","All documentation pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The exact behavior and output of this endpoint cannot be verified without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/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/v1/item/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the specific endpoint's functionality is undescribed. The docs pages are empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,78,149 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,181 'across':108 'actual':213 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,180 'appear':158 'attach':95 'base':8,23,51,73 'base network api' 'behavior':214 'broader':104 'call':4,19,80 'catalog':165 'categori':110 'challeng':67 'classif':125 'connect':196 'content':202 'convers':142 'data':111,115 'descript':176 'detail':210 'doc':187 'document':185,211 'embed':126 'endpoint':55,107,145,154,168,217 'estim':136 'exact':171 'exampl':208 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':172 'gas':135 'generat':143 'geocod':140 'header':99 'http-post' 'i.e':77 'infrastructur':138 'insight':117 'instant':91 'key':86 'learn':120 'limit':89 'list':58,164 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment api' 'name':167 'network':9,24,52 'no-api-key' 'offer':106 'openapi':205 'page':191 'particular':153 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,150 'platform':6,21,39,82,105 'premium':60,179 'price':129,147,188 'prompt':198 'protocol':44 'public':163 'quot':134 'rate':88,132 'readm':190 'remain':218 'report':114 'request':37,68,102,151 'request/response':207 'return':64,193 'say':178 'schema':206 'sentiment':121 'simpli':94,177 'site':161 'specif':54 'substant':201 'summar':124 'text':123 'token':133 'unclear':174 'unit':74 'unknown':219 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':197 'web3':128 'without':203 'x402':11,26,43,97 'x402 api' 'x402-payment'","prices":[{"id":"a0cc4d72-c878-4604-ba78-8bc18d5cbe2d","listingId":"c1f7f2bf-fbc8-4fa1-9ce1-0c4a7315c553","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/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":"2026-04-18T18:34:17.954Z"}],"sources":[{"listingId":"c1f7f2bf-fbc8-4fa1-9ce1-0c4a7315c553","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:17.954Z","lastSeenAt":"2026-04-23T20:01:31.036Z"}],"details":{"listingId":"c1f7f2bf-fbc8-4fa1-9ce1-0c4a7315c553","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/32 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/item/32"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/32"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without managing API keys or subscriptions","Agent-driven workflows that need on-demand paid endpoints settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-call API access","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring non-crypto payment methods","Production workloads that need guaranteed SLAs or support"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:49:32.227Z"},"updatedAt":"2026-04-23T20:01:31.036Z"}}