{"id":"a15c3a69-9ee2-4e8f-899a-3aa512529919","shortId":"CSXSsj","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 broad catalog of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The specific endpoint at `/api/v1/transfers/148` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base.\n\nThe 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 utilities (geocoding, validation, conversion, generation). All endpoints follow the same $0.02 pricing model and are accessible via the x402 payment protocol.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/transfers/148` endpoint specifically returns. The endpoint is live and responds with a valid x402 challenge, but the actual functionality behind this particular path is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","crypto payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific functionality of /api/v1/transfers/148 ('Premium API Access') is not described anywhere","No information on uptime, SLAs, or rate limits beyond the marketing claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/148","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/148","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 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/transfers/148 is not explained. The listing is effectively a stub with pricing info 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'/request':13,28 '/transfers/148':205 '0.02':12,27,59,106,157 '000':100 '20':99 '402':94 '6':110 'access':90,162 'actual':222 'advertis':116 'ai':126 'ai-inference' 'ai/ml':49 'analysi':130 'analyt':48,120 'api':5,20,37,71,89,174 'avail':231 'base':8,23,67,101,113 'base network api' 'behind':224 'broad':42 'call':4,19 'catalog':43 'categori':117 'challeng':95,219 'classif':133 'classification' 'commit':78 'connect':183 'convers':150 'cost':58 'crypto payment api' 'crypto-quotes' 'data':47,52,119,123 'data-analytics' 'decim':111 'descript':201 'detail':190 'doc':173 'document':168 'embed':134 'embeddings' 'enabl':36 'endpoint':45,57,82,153,206,210 'estim':144 'everi':56 'exampl':198 'exchang':139 'export':124 'extrem':170 'feed':138 'financ':135 'finance-data' 'finance/web3':51 'follow':154 'function':223 'gas':143 'generat':151 'geocod':148 'geocoding' 'i.e':105 'includ':118 'infer':50 'infrastructur':146 'insight':125 'key':72 'learn':128 'limit':75 'list':86 'live':212 'low payment fee' 'lowpaymentfee.com':31 'machin':127 'materi':232 'metric':121 'micropayment api' 'model':159 'network':9,24,68 'no-api-key' 'no-auth api' 'offer':40 'openapi':194 'page':178 'paid':62 'particular':226 'path':227 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':166 'per':3,18,60 'platform':6,21,38,115 'premium':88 'price':137,158,175 'prompt':185 'protocol':167 'quot':142 'rate':74,140 'readm':177 'render':180 'report':122 'request':61,96 'request/response':197 'requir':79 'respond':214 'return':92,208 'schema':195 'sentiment':129 'sentiment-analysis' 'servic':55 'sinc':107 'span':46 'spars':171 'specif':81,207 'summar':132 'technic':189 'text':131 'text-summarization' 'token':141 'unclear':229 'unit':102 'usdc':15,30,64,104,108 'usdc api' 'usdc-base-network' 'use':109 'util':54,147 'utility-services' 'valid':149,217 'via':10,25,163 'wallet':184 'web3':136 'x402':11,26,35,165,218 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"667c022b-3c73-494f-a41f-83d21c08b611","listingId":"a15c3a69-9ee2-4e8f-899a-3aa512529919","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/148","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:26.414Z"}],"sources":[{"listingId":"a15c3a69-9ee2-4e8f-899a-3aa512529919","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/148","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:26.414Z","lastSeenAt":"2026-04-22T10:02:30.730Z"}],"details":{"listingId":"a15c3a69-9ee2-4e8f-899a-3aa512529919","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/148 \\\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":"All endpoints cost $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/transfers/148 requests maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/148"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates via micropayments","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use analytics and data export into agent workflows"],"bestFor":["Agents or developers who want zero-signup, pay-per-call API access","Use cases requiring low-cost micropayment-gated endpoints on Base","Prototyping or low-volume workloads where $0.02/call is economical"],"notFor":["High-volume production workloads where per-call costs add up quickly","Users who need detailed API documentation, schemas, or SLAs before integration","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.04Z"},"updatedAt":"2026-04-22T10:02:30.730Z"}}