{"id":"4183e298-7250-4d49-b677-14d7594de5e2","shortId":"k7dPBx","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 infrastructure utilities. Every endpoint is priced at $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no upfront commitments. The x402 payment challenge is live and returns a standard 402 response with an exact-scheme payment requirement.\n\nThe specific endpoint at `/api/v1/transfers/120` is listed as \"Premium API Access\" and accepts POST requests. Based on the x402 challenge, the maximum amount required is 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to the specified payTo address. The 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 (geocoding, validation, conversion, generation).\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 spec, no request/response schema documentation, and no usage examples available from the crawl. The actual functionality behind the `/api/v1/transfers/120` endpoint is unclear; the name \"Premium API Access\" and the path segment \"transfers\" do not map obviously to any of the advertised API categories.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","data-analytics","ai-inference","finance-data","web3-data","geocoding","text-summarization","sentiment-analysis"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API payments","no-auth API"],"warnings":["No OpenAPI or schema documentation available — all /docs, /pricing, /api, /README pages return only 'Connect wallet'","The purpose of /api/v1/transfers/120 ('Premium API Access') is unclear and does not match any of the advertised API categories","No request body schema or response schema is documented anywhere","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/120","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /transfers/120 endpoint is ambiguous. Effectively a stub 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'/api/v1/transfers/120':105,236 '/docs':197 '/pricing':199 '/readme':201 '/request':13,28 '0.02':12,27,61,138 '000':127 '0x8335':132 '20':126 '2913':133 '402':92 '6':142 'Base network API' 'USDC micropayment API' 'accept':113 'access':111,244 'actual':232 'address':154 'advertis':157,258 'ai':167 'ai-inference' 'ai/ml':49 'amount':123 'analysi':171 'analyt':48,161 'api':5,20,37,73,110,243,259 'avail':227 'base':8,23,69,116,128,135 'behind':234 'broad':42 'call':4,19 'catalog':43 'categori':158,260 'chain':149 'challeng':85,120 'classif':174 'commit':81 'connect':207 'content':213 'convers':190 'crawl':230 'crypto API payments' 'data':47,52,160,164 'data-analytics' 'decim':143 'document':192,222 'embed':175 'enabl':36 'endpoint':45,57,103,237 'equal':137 'estim':185 'everi':56 'exact':97 'exact-schem':96 'exampl':226 'exchang':180 'export':165 'extrem':194 'feed':179 'financ':176 'finance-data' 'finance/web3':51 'function':233 'gas':184 'generat':191 'geocod':188 'geocoding' 'given':139 'includ':159 'infer':50 'infrastructur':54,187 'insight':166 'key':74 'learn':169 'limit':77 'list':107 'live':87 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':168 'map':252 'maximum':122 'metric':162 'name':241 'network':9,24,70 'no-api-key' 'no-auth API' 'obvious':253 'offer':40 'on-chain':147 'openapi':217 'page':202 'paid':64 'path':247 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':84,99,144 'payto':153 'per':3,18,62 'platform':6,21,38,156 'post':114 'post-endpoint' 'premium':109,242 'price':59,178 'prompt':209 'quot':183 'rate':76,181 'render':204 'report':163 'request':63,115 'request/response':220 'requir':100,124 'respons':93 'return':89 'schema':221 'scheme':98 'segment':248 'sentiment':170 'sentiment-analysis' 'settl':146 'span':46 'spars':195 'spec':218 'specif':102 'specifi':152 'standard':91 'summar':173 'text':172 'text-summarization' 'token':182 'transfer':249 'unclear':239 'unit':129 'upfront':80 'usag':225 'usdc':15,30,66,131,140 'usdc-base-network' 'util':55 'valid':189 'via':10,25 'wallet':208 'web3':177 'web3-data' 'x402':11,26,35,83,119 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"e0dc2630-1741-4ace-9c31-63bbff663f2d","listingId":"4183e298-7250-4d49-b677-14d7594de5e2","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/120","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:20.963Z"}],"sources":[{"listingId":"4183e298-7250-4d49-b677-14d7594de5e2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/120","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:20.963Z","lastSeenAt":"2026-04-22T16:32:15.974Z"}],"details":{"listingId":"4183e298-7250-4d49-b677-14d7594de5e2","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/120 \\\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":"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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/120"},{"claim":"API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing data analytics or AI inference endpoints without managing API keys or subscriptions","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-use financial data feeds into agent workflows","Using geocoding or text processing utilities with no rate limits"],"bestFor":["Developers who want zero-friction, keyless API access via crypto micropayments","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost per-call pricing without monthly commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Teams that require fiat-only payment methods with no crypto wallet","High-volume consumers who need bulk pricing or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:35.38Z"},"updatedAt":"2026-04-22T16:32:15.974Z"}}