{"id":"7f32dfa7-f0cb-417b-8fcc-5d06e09f7da7","shortId":"akhdzz","kind":"x402","title":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base network via x402 protocol at $0.02/request in USDC.","description":"This endpoint (endpoint-51) is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint is labeled \"Premium API Access\" and accepts POST requests, returning application/json responses. Payment is 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader platform advertises categories including 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 (geocoding, validation, conversion, generation). However, this specific endpoint (endpoint-51) does not map to any of the named API paths listed on the site, so its exact functionality is unclear. The platform emphasizes no API keys, no rate limits, instant access, and payment exclusively via the Base network.\n\nDocumentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so detailed request/response schemas and usage examples are unavailable.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","post-method"],"categories":["general","api-gateway"],"synonyms":["premium api","pay per call api","x402 endpoint","micropayment api","usdc api","base network api","lowpaymentfee"],"warnings":["The exact functionality of endpoint-51 is not documented anywhere on the site","All documentation pages (/docs, /pricing, /README) returned only 'Connect wallet' with no content","No OpenAPI spec, no request schema, no response examples available","This endpoint path does not match any of the named APIs listed on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-51","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/endpoint-51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","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 the specific functionality of endpoint-51 is unknown. Docs pages are empty 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'/docs':182 '/pricing':183 '/readme':184 '/request':16,34 '0.02':15,33,95 '000':86 '20':85 '6':91 'accept':77 'access':7,25,75,172 'advertis':101 'ai':111 'analysi':115 'analyt':105 'api':6,24,56,74,150,166 'application/json':81 'base':9,27,64,87,178 'base network api' 'base-network' 'broader':99 'call':4,22 'categori':102 'classif':118 'collect':50 'connect':188 'content':194 'convers':134 'data':104,108 'decim':92 'detail':196 'document':180 'embed':119 'emphas':164 'endpoint':38,39,70,139,140 'equal':94 'estim':129 'exact':158 'exampl':201 'exchang':124 'exclus':175 'export':109 'feed':123 'financ':120 'function':159 'gas':128 'generat':135 'geocod':132 'howev':136 'includ':103 'infrastructur':131 'insight':110 'instant':171 'json-response' 'key':167 'label':72 'learn':113 'limit':170 'list':152 'lowpaymentfee' 'lowpaymentfee.com':45 'machin':112 'map':144 'metric':106 'micropayment api' 'name':149 'network':10,28,65,179 'offer':48 'page':181 'part':42 'path':151 'pay':2,20,53 'pay per call api' 'pay-per-cal':1,19 'pay-per-request':52 'payment':83,174 'per':3,21,54,96 'platform':46,100,163 'post':78 'post-method' 'premium':5,23,73 'premium api' 'price':122 'prompt':190 'protocol':13,31,61 'quot':127 'rate':125,169 'report':107 'request':55,79,97 'request/response':197 'respons':82 'return':80,185 'schema':198 'sentiment':114 'settl':57 'site':155 'specif':69,138 'substant':193 'summar':117 'text':116 'token':126 'unavail':203 'unclear':161 'unit':88 'usag':200 'usdc':18,36,67,90 'usdc api' 'usdc-settlement' 'use':66 'valid':133 'via':11,29,58,176 'wallet':189 'web3':121 'x402':12,30,60 'x402 endpoint' 'x402-payment'","prices":[{"id":"f0f24d74-5b61-4522-bfdb-0a3d60e33e21","listingId":"7f32dfa7-f0cb-417b-8fcc-5d06e09f7da7","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/endpoint-51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:59.039Z"}],"sources":[{"listingId":"7f32dfa7-f0cb-417b-8fcc-5d06e09f7da7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:59.039Z","lastSeenAt":"2026-04-22T12:03:14.858Z"}],"details":{"listingId":"7f32dfa7-f0cb-417b-8fcc-5d06e09f7da7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-51 \\\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 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/endpoint-51"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/endpoint-51"}],"useCases":["Programmatic access to premium data or services without API key registration","Agent-driven workflows that need instant, keyless API access with crypto payment","Testing x402 protocol integrations on Base network"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents with USDC wallets on Base network","Low-friction API consumption without subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume use cases where per-request pricing is cost-prohibitive"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.355Z"},"updatedAt":"2026-04-22T12:03:14.858Z"}}