{"id":"53ea0170-67f7-4c16-b9f8-c1712e08a607","shortId":"BspL37","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com offers a suite of pay-per-request APIs accessible via the x402 payment protocol on the Base network. This specific endpoint (`/api/v1/generate/resource/103`) is listed as \"Premium API Access\" and accepts POST requests. Payment is settled in USDC on Base, with a maximum amount of 20,000 base units (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe broader lowpaymentfee.com 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 endpoints are priced at $0.02 per request. However, the specific functionality behind `/api/v1/generate/resource/103` is not documented beyond the label \"Premium API Access,\" so its exact input/output behavior is unclear.\n\nThe endpoint is live and returns a well-formed x402 challenge (HTTP 402) with scheme \"exact\" and version 1. The USDC asset contract (`0x8335...2913`) matches the canonical Base USDC address. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["infrastructure","api-gateway"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact functionality of /api/v1/generate/resource/103 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /api, /README) returned no substantive content, only a 'Connect wallet' prompt.","No input or output schema is available; callers cannot know what to send or what to expect back.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but none are documented in detail."],"endpointUrl":"https://lowpaymentfee.com/api/v1/generate/resource/103","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/generate/resource/103","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, but there is no documentation, no OpenAPI schema, no example requests or responses, and the actual functionality behind 'Premium API Access' is entirely opaque. All doc pages returned only 'Connect wallet' with no 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'/api/v1/generate/resource/103':54,165 '/docs':216 '/pricing':217 '/readme':219 '/request':13,28 '0.02':12,27,82,157 '000':78 '0x8335':206 '1':201 '20':77 '2913':207 '402':195 '6':88 'Base network API' 'USDC API' 'accept':62 'access':7,22,41,60,174 'across':116 'address':213 'advertis':114 'ai':126 'amount':75 'analysi':130 'analyt':120 'api':6,21,40,59,91,173 'asset':204 'attach':102 'base':9,24,49,71,79,211 'base-network' 'behavior':179 'behind':164 'beyond':169 'broader':111 'call':4,19,84 'caller':100 'canon':210 'categori':118 'challeng':193 'classif':133 'commit':97 'connect':224 'content':230 'contract':205 'convers':150 'crypto-paid API' 'data':119,123 'decim':89 'detail':232 'document':168,214 'embed':134 'endpoint':53,115,153,183 'estim':144 'exact':177,198 'exchang':139 'export':124 'feed':138 'financ':135 'form':191 'four':117 'function':163 'gas':143 'generat':151 'geocod':148 'header':106 'howev':160 'http':194 'i.e':81 'infrastructur':146 'input/output':178 'insight':125 'key':92 'label':171 'learn':128 'limit':94 'list':56 'live':185 'lowpaymentfee' 'lowpaymentfee.com':31,112 'machin':127 'match':208 'maximum':74 'metric':121 'micropayment API' 'network':50 'no-api-key' 'offer':32 'page':215 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call' 'pay-per-request':36 'payment':45,65,105 'per':3,18,38,83,158 'platform':113 'post':63 'post-endpoint' 'premium':5,20,58,172 'premium API access' 'price':137,155 'prompt':226 'protocol':46 'quot':142 'rate':93,140 'report':122 'request':39,64,109,159 'request/response':233 'requir':99 'return':187,221 'schema':234 'scheme':197 'sentiment':129 'settl':67 'simpli':101 'sinc':85 'specif':52,162 'substant':229 'suit':34 'summar':132 'text':131 'token':141 'unavail':236 'unclear':181 'unit':80 'upfront':96 'usdc':15,30,69,86,203,212 'usdc-settlement' 'use':87 'util':147 'valid':149 'version':200 'via':10,25,42 'wallet':225 'web3':136 'well':190 'well-form':189 'x402':11,26,44,104,192 'x402 API' 'x402-payment'","prices":[{"id":"9111a663-6a3b-48e4-ae09-ee87294e3b62","listingId":"53ea0170-67f7-4c16-b9f8-c1712e08a607","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/generate/resource/103","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:20.099Z"}],"sources":[{"listingId":"53ea0170-67f7-4c16-b9f8-c1712e08a607","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/generate/resource/103","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:20.099Z","lastSeenAt":"2026-04-24T10:32:14.163Z"}],"details":{"listingId":"53ea0170-67f7-4c16-b9f8-c1712e08a607","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/generate/resource/103 \\\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":"Endpoint returns HTTP 402 with x402 challenge, scheme 'exact', on Base network, USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/103"},{"claim":"maxAmountRequired is 20000 base units (USDC, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/generate/resource/103"},{"claim":"All endpoints priced at $0.02/request, no API keys, no rate limits, no commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 pay-per-request patterns","AI agents that need keyless, on-demand API access","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume production workloads where $0.02/request adds up significantly","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:42.197Z"},"updatedAt":"2026-04-24T10:32:14.163Z"}}