{"id":"f6b58816-068c-4127-8d8a-e65988935935","shortId":"DE7vSF","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","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. All endpoints are pay-per-request using USDC on the Base network, settled via the x402 protocol. There are no API keys, no rate limits, and no subscription commitments — callers simply attach an X-PAYMENT header with each request.\n\nThe specific endpoint at `/api/v1/transfers/75` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USDC, i.e. $0.02) per call. The platform advertises additional endpoint categories including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, gas estimates, geocoding, validation, conversion, and data export — all at the same $0.02 price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live and responds with a valid x402 challenge, but without documentation it is unclear what request body this specific endpoint expects or what response it returns.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","no-rate-limits","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","micropayment API","USDC API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No API documentation available — all doc/pricing/README pages render only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected request body for /api/v1/transfers/75 is undocumented","The broad catalog of endpoints (AI, finance, utils, etc.) listed on the homepage cannot be independently verified","Response format and structure are unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/75","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of this specific '/transfers/75' endpoint is unclear beyond the generic 'Premium API Access' label. The broad catalog of endpoints listed on the homepage cannot be verified for 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'/api/v1/transfers/75':105 '/docs':169 '/pricing':170 '/readme':173 '/request':13,30 '0.02':12,29,126,129,161 '000':121 '20':120 '402':115 'Base network API' 'USDC API' 'access':111 'addit':135 'advertis':134 'ai-inference' 'ai/ml':53 'analysi':140 'analyt':52 'api':5,15,22,32,41,81,110 'attach':92 'avail':200 'base':8,25,71,122 'base-network' 'bodi':220 'broad':46 'call':4,21,131 'caller':90 'catalog':47 'categori':137 'challeng':116,211 'classif':143 'commit':89 'connect':179 'convers':153 'crypto-paid API' 'data':51,56,155 'data-analytics' 'detail':186 'document':164,195,214 'embed':144 'enabl':40 'endpoint':49,61,103,136,202,223 'estim':150 'exampl':198 'exchang':147 'expect':224 'export':156 'extrem':166 'feed':146 'finance-data' 'finance/web3':55 'gas':149 'geocod':151 'header':97 'i.e':128 'includ':138 'infer':54 'key':16,33,82 'limit':85 'list':107 'live':204 'lowpaymentfee' 'lowpaymentfee.com':35 'micropayment API' 'network':9,26,72 'no-api-key' 'no-rate-limits' 'offer':44 'openapi':190 'page':174 'pay':2,19,64 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request':63 'payload':199 'payment':96 'per':3,20,65,130 'platform':6,23,42,133 'point':163 'premium':109 'premium API access' 'price':145,162 'prompt':181 'protocol':77 'rate':84,148 'render':176 'request':66,100,117,219 'request/response':193 'requir':17,34 'respond':206 'respons':227 'return':113,229 'schema':194 'sentiment':139 'servic':59 'settl':73 'simpli':91 'span':50 'spars':167 'spec':191 'specif':102,222 'subscript':88 'summar':142 'technic':185 'text':141 'unclear':217 'unit':123 'usdc':68,125,127 'usdc-settlement' 'use':67 'util':58 'utility-services' 'valid':152,209 'via':10,27,74 'wallet':180 'web3-data' 'without':213 'x':95 'x-payment':94 'x402':11,28,39,76,210 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"bb3671eb-1dee-4c77-a961-dfeb19bfab0b","listingId":"f6b58816-068c-4127-8d8a-e65988935935","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:56.666Z"}],"sources":[{"listingId":"f6b58816-068c-4127-8d8a-e65988935935","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:56.666Z","lastSeenAt":"2026-04-22T15:02:25.692Z"}],"details":{"listingId":"f6b58816-068c-4127-8d8a-e65988935935","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/75 \\\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 up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/75"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data and crypto token quotes on a per-request basis","Running geocoding, validation, or data conversion tasks with micropayments","Exporting analytics data or generating reports without a subscription"],"bestFor":["Developers who want zero-friction API access without signup or API keys","Agents and bots that can settle payments via x402 on Base","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, SDKs, or guaranteed SLAs","Consumers without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.631Z"},"updatedAt":"2026-04-22T15:02:25.692Z"}}