{"id":"ba9d0479-78cc-4a05-9777-3f996725e4c1","shortId":"9bBCpj","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/40` 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 listed at the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/item/40`) 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 detail. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional documentation, making it impossible to determine the request/response schema or the specific data this endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee"],"warnings":["The endpoint /api/v1/item/40 is not listed in the site's public API catalog — its purpose is undocumented.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No request or response schema is available; integration requires trial-and-error or wallet-gated docs."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/40","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/40","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 request/response schema, and the specific purpose of /api/v1/item/40 is unknown. The docs pages are empty beyond a wallet-connect 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 'Base network API' 'USDC API' 'accept':46 'access':62,92,184 'across':108 'addit':204 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,183,193 'appear':161 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'catalog':168 'categori':110 'challeng':67 'classif':125 'connect':199 'convers':142 'data':111,115,217 'descript':179 'detail':188 'determin':210 'doc':190 'document':205 'embed':126 'endpoint':55,107,145,157,171,219 'estim':136 'exact':174 'exchang':131 'export':116 'feed':130 'financ':127 'four':109 'function':175 'gas':135 'generat':143 'geocod':140 'header':99 'http-post' 'i.e':77 'imposs':208 'infrastructur':138 'insight':117 'instant':91 'key':86 'learn':120 'limit':89 'list':58,147,167 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'make':206 'metric':113 'micropayment API' 'name':170 'network':9,24,52 'no-api-key' 'offer':106 'page':194 'particular':156 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'premium':60,182 'price':129,153,191 'prompt':201 'protocol':44 'public':166 'quot':134 'rate':88,132 'render':196 'report':114 'request':37,68,102 'request/response':212 'return':64,220 'say':181 'schema':213 'sentiment':121 'simpli':94,180 'site':164 'specif':54,216 'summar':124 'text':123 'token':133 'unclear':177 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':200 'web3':128 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"64dfc6a5-6648-4023-a8aa-ca73ffaeace4","listingId":"ba9d0479-78cc-4a05-9777-3f996725e4c1","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/40","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:28.289Z"}],"sources":[{"listingId":"ba9d0479-78cc-4a05-9777-3f996725e4c1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/40","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:28.289Z","lastSeenAt":"2026-04-25T04:02:27.745Z"}],"details":{"listingId":"ba9d0479-78cc-4a05-9777-3f996725e4c1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/40 \\\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/40"},{"claim":"The platform lists endpoints at $0.02/request with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/item/40"}],"useCases":["Accessing premium data or services with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to unknown premium content"],"bestFor":["Developers or agents wanting keyless, pay-per-call API access","x402-compatible wallets on Base network","Low-commitment, no-subscription API usage"],"notFor":["Users who need detailed API documentation before integrating","High-volume use cases where per-request pricing may add up","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.583Z"},"updatedAt":"2026-04-25T04:02:27.745Z"}}