{"id":"14f39bf0-70bb-46b2-a19d-fedb8d4d00ca","shortId":"hLLwqa","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 is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/transfers/113` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requiring up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is settled on-chain to the provider's wallet. The platform advertises additional endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/transfers/113` endpoint actually returns or what input it expects beyond a POST with JSON content type. The platform's purpose and the specific functionality behind \"Premium API Access\" remain unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["infrastructure","finance"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api","base network api","crypto payment api"],"warnings":["No documentation available — all doc/pricing/API pages render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose of the /api/v1/transfers/113 'Premium API Access' endpoint is completely undocumented","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/113","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/transfers/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what 'Premium API Access' at /api/v1/transfers/113 actually does. All doc pages return only 'Connect wallet'. This is effectively a stub 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'/request':13,28 '0.02':12,27,62,118,158 '000':107 '0x8335':112 '20':106 '2913':113 '6':116 'accept':93 'access':91,224 'across':45 'actual':199 'addit':135 'advertis':134 'ai':48 'analysi':139 'analyt':47 'api':5,20,37,74,90,167,223 'avail':228 'base':8,23,70,108,115 'base network api' 'behind':221 'beyond':206 'call':4,19,120 'categori':56 'chain':126 'challeng':98 'classif':142 'commit':79 'confirm':99 'connect':176 'content':182,211 'convers':150 'crypto payment api' 'data':46,152 'decim':117 'descript':193 'doc':166 'document':161 'embed':143 'enabl':36 'endpoint':44,58,83,136,198 'exampl':190 'exchang':146 'expect':205 'export':153 'extrem':163 'feed':145 'financ':51 'function':220 'geocod':148 'infrastructur':54 'input':203 'json':210 'json-response' 'key':75 'learn':50 'limit':77 'list':87 'live':102 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'materi':229 'micropayment api' 'network':9,24,71 'no-api-key' 'offer':40 'on-chain':124 'openapi':186 'page':171 'paid':65 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':121 'per':3,18,63,119 'platform':6,21,38,133,214 'point':160 'post':94,208 'post-endpoint' 'premium':89,222 'price':60,144,159,168 'prompt':178 'provid':129 'purpos':216 'rate':76,147 'readm':170 'remain':225 'render':173 'request':64,95 'request/response':189 'requir':80,103 'return':200 'schema':187 'sentiment':138 'settl':123 'spars':164 'specif':82,219 'summar':141 'text':140 'type':212 'unclear':226 'unit':109 'usdc':15,30,67,111 'usdc api' 'usdc-base-network' 'util':55 'valid':149 'varieti':42 'via':10,25 'wallet':131,177 'web3':52 'x402':11,26,35,97 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"409eb82e-6f9f-4223-add7-7eb7cba4c475","listingId":"14f39bf0-70bb-46b2-a19d-fedb8d4d00ca","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/transfers/113","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:20.376Z"}],"sources":[{"listingId":"14f39bf0-70bb-46b2-a19d-fedb8d4d00ca","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/113","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:20.376Z","lastSeenAt":"2026-04-23T23:03:17.540Z"}],"details":{"listingId":"14f39bf0-70bb-46b2-a19d-fedb8d4d00ca","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/113 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge confirms live endpoint requiring 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/transfers/113"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Paying per-call for API access without managing API keys or subscriptions","Programmatic agent-to-service payments using USDC on Base","Accessing utility or data endpoints with on-chain micropayments"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto-native billing over traditional API key management"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume use cases where per-request pricing at $0.02 may be costly","Users without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.334Z"},"updatedAt":"2026-04-23T23:03:17.540Z"}}