{"id":"804c7ac1-b8b0-4689-b6a5-64aab406e8d7","shortId":"gTA9mM","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/48` 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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/48`) does not appear in the site's publicly listed API catalog, and no documentation describes what it returns. The crawled docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no additional content. Without schema details or example responses, the actual functionality behind \"Premium API Access\" remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API"],"warnings":["Endpoint /api/v1/item/48 is not listed in the site's public API catalog — its actual functionality is unknown.","No documentation, OpenAPI spec, or example responses are available for this endpoint.","All secondary pages (docs, pricing, README, api) returned only a 'Connect wallet' prompt with no substantive content.","The description 'Premium API Access' is generic and does not explain what data or service is provided."],"endpointUrl":"https://lowpaymentfee.com/api/v1/item/48","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/48","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no example request/response, and the specific item/48 endpoint is not listed in the site's public catalog. The docs/pricing/README pages all render only a wallet-connect prompt with no useful 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'/request':13,28 '0.02':12,27,78,153 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,92,208 'across':112 'actual':203 'addit':194 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,169,207 'appear':162 'attach':95 'base':8,23,51,73 'behind':205 'broader':108 'call':4,19,80 'caller':93 'catalog':170 'categori':114 'challeng':67 'classif':129 'connect':189 'content':195 'convers':146 'crawl':179 'data':115,119 'describ':174 'detail':198 'doc':180 'document':173 'embed':130 'endpoint':55,111,149,158 'estim':140 'exampl':200 'exchang':135 'export':120 'feed':134 'financ':131 'four':113 'function':204 'gas':139 'generat':147 'geocod':144 'header':100 'http-post' 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'key':86 'learn':124 'limit':89 'list':58,168 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'network':9,24,52 'no-api-key' 'offer':110 'page':184 'particular':157 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,99,105 'per':3,18,36,79,154 'platform':6,21,39,82,109 'premium':60,206 'price':133,151,181 'prompt':191 'proof':106 'protocol':44 'public':167 'quot':138 'rate':88,136 'readm':183 'remain':209 'render':186 'report':118 'request':37,68,155 'respons':201 'return':64,177 'schema':197 'sentiment':125 'simpli':94 'site':165 'specif':54 'summar':128 'text':127 'token':137 'unclear':210 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':190 'web3':132 'without':196 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 API' 'x402-payment'","prices":[{"id":"fed01f12-1cce-4988-91cc-529a0dde3eb3","listingId":"804c7ac1-b8b0-4689-b6a5-64aab406e8d7","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/48","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:30.695Z"}],"sources":[{"listingId":"804c7ac1-b8b0-4689-b6a5-64aab406e8d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/item/48","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:30.695Z","lastSeenAt":"2026-04-24T10:32:03.309Z"}],"details":{"listingId":"804c7ac1-b8b0-4689-b6a5-64aab406e8d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/item/48 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/48"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base.","source_url":"https://lowpaymentfee.com/api/v1/item/48"},{"claim":"The site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base for per-call API access","Use cases requiring no signup or API key management"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:50.492Z"},"updatedAt":"2026-04-24T10:32:03.309Z"}}