{"id":"8bf3edf8-0e33-4143-bf2b-14f9ca4e9f78","shortId":"J3BZWT","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 market data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/transfers/14` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform lists roughly 16 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 at the same $0.02 price point.\n\nDocumentation beyond the landing page is sparse; the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge returned), but the actual behavior behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-endpoint","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","low fee API","crypto-paid API","serverless API marketplace"],"warnings":["No OpenAPI or schema documentation available — actual request format and response structure are unknown","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/transfers/14 ('Premium API Access') is not explained anywhere in the crawled material","No request or response examples are available; integration requires trial-and-error behind the paywall"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/14","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and no examples of what the endpoint actually returns. The /docs and other pages are empty. The specific purpose of '/api/v1/transfers/14' is unclear beyond the generic label 'Premium API 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'/api/v1/transfers/14':97 '/docs':192 '/pricing':194 '/readme':196 '/request':19,38 '0.02':18,37,128,181 '000':117 '0x8335':122 '16':140 '20':116 '2913':123 '402':231 '6':133 'Base network API' 'USDC micropayment API' 'accept':105 'access':103 'across':142 'actual':236 'advertis':111 'ai':12,31,152 'ai-inference' 'ai/ml':57 'analysi':156 'analyt':56,146 'api':5,24,45,84,102 'avail':222 'base':8,27,77,118,125 'behavior':237 'behind':238 'beyond':185 'broad':50 'broader':136 'call':4,23,130 'categori':144 'challeng':110,232 'classif':159 'classification' 'collect':51 'confirm':229 'connect':202 'content':208 'convers':175 'cost':114 'cover':10,29 'crawl':225 'crypto-paid API' 'data':11,30,55,61,145,149 'data-analytics' 'decim':134 'document':184,217 'embed':160 'embeddings' 'enabl':44 'endpoint':16,35,53,67,95,141,227 'equal':127 'estim':170 'exampl':221 'exchang':165 'export':150 'feed':164 'financ':13,32,161 'finance-data' 'finance/web3':59 'four':143 'gas':169 'general':63 'generat':176 'geocod':173 'geocoding' 'infer':58 'infrastructure/utilities':172 'insight':151 'key':85 'land':187 'learn':154 'limit':88 'list':99,138 'live':230 'low fee API' 'lowpaymentfee.com':39 'machin':153 'market':60 'maximum':113 'metric':147 'network':78 'offer':48 'openapi':212 'page':188,197 'paid':69 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'paywal':240 'per':3,22,71,129 'per-request':70 'per-request-billing' 'platform':6,25,46,137 'point':183 'post':106 'post-endpoint' 'premium':101 'price':163,182 'prompt':204 'protocol':82 'quot':168 'rate':87,166 'render':199 'report':148 'request':72,107 'request/response':215 'requir':92 'return':233 'rough':139 'schema':216 'sentiment':155 'sentiment-analysis' 'serverless API marketplace' 'servic':65 'span':54 'spars':190 'spec':213 'specif':94 'subscript':91 'summar':158 'text':157 'text-summarization' 'token':167 'unit':119 'unknown':242 'usag':220 'usdc':9,28,74,121,131 'usdc-base' 'use':73,132 'util':15,34,64 'utility-services' 'valid':174 'via':79 'wallet':203 'web3':162 'x402':43,81,109 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"d695995f-a61f-4d0b-88f8-b651c66d0172","listingId":"8bf3edf8-0e33-4143-bf2b-14f9ca4e9f78","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/14","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:36.203Z"}],"sources":[{"listingId":"8bf3edf8-0e33-4143-bf2b-14f9ca4e9f78","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/14","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:36.203Z","lastSeenAt":"2026-04-22T09:01:48.157Z"}],"details":{"listingId":"8bf3edf8-0e33-4143-bf2b-14f9ca4e9f78","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/14 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/14"},{"claim":"All listed 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":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/14"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates via micropayment","Running data analytics queries or exporting data on a per-request basis","Geocoding, validation, or format conversion as utility microservices"],"bestFor":["AI agents that can settle x402 payments in USDC on Base","Developers wanting zero-commitment, pay-as-you-go API access without subscriptions","Use cases requiring low-cost ($0.02) individual API calls across multiple domains"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume workloads where per-request pricing at $0.02 would be more expensive than a subscription","Applications that cannot settle payments on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.592Z"},"updatedAt":"2026-04-22T09:01:48.157Z"}}