{"id":"0543bbf9-cec3-40b6-84a0-28b0f003ba28","shortId":"hvn4Xb","kind":"x402","title":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call premium API on Base via x402 — $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled on the Base network using the x402 protocol and USDC. The specific endpoint at `/api/resource/7` is labeled \"Premium API Access\" and accepts POST requests. Payment is made per-call with no API keys, no rate limits, and no subscriptions — just an x402 payment header with each request.\n\nThe broader platform advertises 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 listed endpoints are priced at $0.02 per request. The x402 challenge for `/api/resource/7` specifies a maxAmountRequired of 20000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what `/api/resource/7` actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this specific resource provides.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","post-endpoint","json-response"],"categories":["api-marketplace","crypto-payments"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no technical content.","The specific resource at /api/resource/7 has no description of what it returns or what input it expects.","No OpenAPI or output schema provided beyond basic HTTP method and mime type.","Platform lists many endpoint categories (AI, finance, data, infra) but none are documented with schemas or examples."],"endpointUrl":"https://lowpaymentfee.com/api/resource/7","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/7","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 with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and the docs/pricing/API pages are empty beyond a wallet-connect prompt. The purpose of `/api/resource/7` specifically is undocumented, making this effectively a stub 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'/request':12,30 '0.02':11,29,144,167 '0x8335':161 '20000':156 '2913':162 '402':218 '402 payment API' '6':171 'Base network API' 'USDC API' 'accept':70 'access':68 'across':102 'actual':209 'advertis':100 'ai':112 'analysi':116 'analyt':106 'api':6,16,24,34,46,67,81,181 'base':8,26,51,157,164 'base-network' 'broader':98 'call':4,22,78 'categori':104 'challeng':149,219 'classif':119 'collect':40 'connect':187 'convers':136 'data':105,109,227 'decim':172 'descript':205 'detail':194 'doc':178 'document':173,222 'embed':120 'endpoint':47,61,101,140,212 'equal':166 'estim':130 'exampl':202 'exchang':125 'export':110 'extrem':175 'feed':124 'financ':121 'four':103 'function':229 'gas':129 'generat':137 'geocod':134 'given':168 'header':93 'host':38 'infrastructur':132 'insight':111 'json-response' 'key':17,35,82 'label':65 'learn':114 'limit':85 'list':139 'live':214 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':113 'made':75 'maxamountrequir':154 'metric':107 'micropayment API' 'network':52 'no-api-key' 'openapi':198 'page':182 'pay':2,20,43 'pay-per-cal':1,19 'pay-per-call API' 'pay-per-request':42 'payment':73,92 'per':3,21,44,77,145 'per-cal':76 'per-request-billing' 'platform':99 'post':71 'post-endpoint' 'premium':5,23,66 'price':123,142,179 'prompt':189 'proper':217 'protocol':56 'provid':233 'quot':128 'rate':84,126 'render':184 'report':108 'request':45,72,96,146 'request/response':201 'requir':18,36 'resourc':232 'return':210,215 'schema':199 'sentiment':115 'settl':48 'spars':176 'specif':60,231 'specifi':152 'subscript':88 'summar':118 'technic':193 'text':117 'token':127 'unclear':225 'unit':158 'usdc':14,32,58,160,169 'usdc-settlement' 'use':53 'util':133 'valid':135 'via':9,27 'wallet':188 'web3':122 'without':221 'x402':10,28,55,91,148 'x402 API' 'x402-payment'","prices":[{"id":"67b89f53-a5dc-4c1d-b360-57631f50902b","listingId":"0543bbf9-cec3-40b6-84a0-28b0f003ba28","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/7","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:02.845Z"}],"sources":[{"listingId":"0543bbf9-cec3-40b6-84a0-28b0f003ba28","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/7","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:02.845Z","lastSeenAt":"2026-04-22T05:30:36.751Z"}],"details":{"listingId":"0543bbf9-cec3-40b6-84a0-28b0f003ba28","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/7 \\\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":"All endpoints priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/resource/7"},{"claim":"Platform advertises endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, and API pages render only a 'Connect wallet' prompt with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API resources without managing API keys or subscriptions","Agent-driven workflows that need on-demand, per-call billing via crypto","Testing x402 protocol integrations with a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that need keyless, pay-as-you-go API access","Low-volume consumers who want per-request pricing with no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads requiring bulk pricing or rate-limit guarantees","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.995Z"},"updatedAt":"2026-04-22T05:30:36.751Z"}}