{"id":"29cb040f-8263-4fdf-92c3-efc3c69bf83c","shortId":"hbYJLs","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 collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/resource/31` is labeled \"Premium API Access\" and accepts POST requests with payment of up to 20,000 base units of USDC (i.e., $0.02 per call, since USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 listed endpoints are priced at $0.02 per request.\n\nHowever, the specific endpoint `/api/resource/31` does not map to any of the named endpoints on the landing page, and no documentation, request/response schemas, or examples are available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without knowing what `/api/resource/31` actually returns, callers should treat this as an opaque premium endpoint with uncertain functionality.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api","infrastructure"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The endpoint path /api/resource/31 does not correspond to any named endpoint on the landing page — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content.","No request body schema or response schema is available; callers cannot know what to send or what to expect.","No OpenAPI spec, ai-plugin manifest, or agents.txt discovered."],"endpointUrl":"https://lowpaymentfee.com/api/resource/31","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/31","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 request/response schema, and no indication of what /api/resource/31 actually does. The docs pages are empty. This is effectively a stub 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'/request':13,28 '0.02':12,27,79,157 '000':73 '20':72 '6':85 'Base network API' 'USDC pay-per-call' 'accept':64 'access':7,22,62 'across':115 'actual':209 'advertis':113 'ai':125 'analysi':129 'analyt':119 'api':6,21,40,61,88,189 'attach':97 'avail':186 'base':9,24,49,74 'base-network' 'broader':110 'call':4,19,81 'caller':95,211 'categori':117 'classif':132 'collect':34 'connect':198 'content':204 'convers':149 'crypto-paid endpoint' 'data':118,122 'decim':86 'doc':188 'document':180 'embed':133 'endpoint':41,55,114,153,163,173,219 'estim':143 'exampl':184 'exchang':138 'export':123 'feed':137 'financ':134 'four':116 'function':222 'gas':142 'generat':150 'geocod':147 'header':102 'howev':160 'i.e':78 'infrastructur':145 'insight':124 'key':89 'know':206 'label':59 'land':176 'learn':127 'limit':92 'list':152 'lowpaymentfee' 'lowpaymentfee.com':31,111 'machin':126 'map':167 'metric':120 'micropayment API' 'name':172 'network':50 'no-api-key' 'offer':32 'opaqu':217 'page':177,193 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-request':36 'payment':68,101,107 'per':3,18,38,80,158 'platform':112 'post':65 'post-method' 'premium':5,20,60,218 'premium API access' 'price':136,155,190 'prompt':200 'proof':108 'protocol':46 'quot':141 'rate':91,139 'readm':192 'report':121 'request':39,66,159 'request/response':181 'requir':94 'return':195,210 'schema':182 'sentiment':128 'settl':42 'simpli':96 'sinc':82 'specif':54,162 'substant':203 'summar':131 'text':130 'token':140 'treat':213 'uncertain':221 'unit':75 'usdc':15,30,52,77,83 'usdc-settlement' 'use':51,84 'util':146 'valid':105,148 'via':10,25,43 'wallet':199 'web3':135 'without':205 'x':100 'x-payment':99 'x402':11,26,45,106 'x402 API' 'x402-payment'","prices":[{"id":"870ebeeb-0a33-4a97-8167-7bfd00bb3a0d","listingId":"29cb040f-8263-4fdf-92c3-efc3c69bf83c","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:00.593Z"}],"sources":[{"listingId":"29cb040f-8263-4fdf-92c3-efc3c69bf83c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/resource/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:00.593Z","lastSeenAt":"2026-04-23T00:31:04.531Z"}],"details":{"listingId":"29cb040f-8263-4fdf-92c3-efc3c69bf83c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/resource/31 \\\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":"Endpoint returns 402 with x402 challenge accepting USDC on Base network with maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/resource/31"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/resource/31"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","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 traditional API key management","Agent-driven workflows that settle per-call payments in USDC on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integration","AI agents that need keyless, pay-per-use API access","Low-cost micropayment API consumption on Base L2"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Anyone requiring known, well-documented response schemas for production use","Free-tier or subscription-based API consumers"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.029Z"},"updatedAt":"2026-04-23T00:31:04.531Z"}}