{"id":"778ace2d-09da-4807-8285-0510f6536f70","shortId":"spdeF7","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 hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/endpoint-47` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC (contract 0x8335…2913 on Base). The x402 challenge indicates a maximum amount of 20,000 base units, which at 6 decimals for USDC equals $0.02 per 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 with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, this specific endpoint (`/api/endpoint-47`) does not correspond 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/endpoint-47` actually does or what input it expects, practical usage is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","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","crypto-paid endpoint"],"warnings":["Endpoint /api/endpoint-47 does not match any named endpoint on the provider's landing page — its actual functionality is unknown.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content.","No request or response schema is available; callers cannot know what input to send or what output to expect.","No OpenAPI spec or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/endpoint-47","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-47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI schema, no request/response examples, and the endpoint path does not match any named service on the site. Docs pages are empty. Effectively a stub 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'/request':13,28 '0.02':12,27,93,143 '000':83 '0x8335':70 '20':82 '2913':71 '6':88 'Base network API' 'USDC micropayment API' 'accept':62 'access':42,60 'across':101 'actual':207 'advertis':99 'ai':111 'amount':80 'analysi':115 'analyt':105 'api':5,20,40,59,148,187 'avail':184 'base':8,23,50,73,84 'base-network' 'broader':97 'call':4,19 'categori':103 'challeng':76 'classif':118 'collect':34 'commit':156 'connect':196 'content':202 'contract':69 'convers':135 'correspond':165 'crypto-paid endpoint' 'data':104,108 'decim':89 'doc':186 'document':178 'embed':119 'endpoint':41,54,100,139,161,171 'equal':92 'estim':129 'exampl':182 'exchang':124 'expect':213 'export':109 'feed':123 'financ':120 'four':102 'gas':128 'generat':136 'geocod':133 'host':32 'howev':158 'http-post' 'indic':77 'infrastructur':131 'input':211 'insight':110 'key':149 'know':204 'label':57 'land':174 'learn':113 'limit':152 'list':138 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':112 'maximum':79 'metric':106 'minimum':155 'name':170 'network':9,24,51 'no-api-key' 'page':175,191 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':46,66 'per':3,18,38,94,144 'platform':6,21,98 'post':63 'practic':214 'premium':58 'price':122,141,188 'prompt':198 'protocol':47 'quot':127 'rate':125,151 'readm':190 'report':107 'request':39,64,95,145 'request/response':179 'requir':157 'return':193 'schema':180 'sentiment':114 'settl':65 'specif':53,160 'specul':217 'substant':201 'summar':117 'text':116 'token':126 'unit':85 'usag':215 'usdc':15,30,68,91 'usdc-settlement' 'util':132 'valid':134 'via':10,25,43 'wallet':197 'web3':121 'without':203 'x402':11,26,45,75 'x402 API' 'x402-payment'","prices":[{"id":"bbd7dd0a-e23b-4593-a58a-15d3ba0aae9c","listingId":"778ace2d-09da-4807-8285-0510f6536f70","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-47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:33:55.624Z"}],"sources":[{"listingId":"778ace2d-09da-4807-8285-0510f6536f70","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/endpoint-47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:33:55.624Z","lastSeenAt":"2026-04-23T20:01:28.805Z"}],"details":{"listingId":"778ace2d-09da-4807-8285-0510f6536f70","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/endpoint-47 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 in USDC (6 decimals) on Base, equaling $0.02 per request.","source_url":"https://lowpaymentfee.com/api/endpoint-47"},{"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":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/endpoint-47"},{"claim":"Docs, API, pricing, and README pages all returned only 'Connect wallet' with no documentation content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to paid API services without traditional API key registration","Agent-driven workflows that need instant, keyless API access settled in USDC on Base","Exploring x402 payment protocol integrations for micropayment-gated endpoints"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents with USDC on Base that need low-friction API access","Projects wanting to avoid API key management and subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","Production workloads requiring well-documented, schema-validated endpoints"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:18:01.797Z"},"updatedAt":"2026-04-23T20:01:28.805Z"}}