{"id":"a8fac2b5-1adf-4c1e-93f5-c485c28686ce","shortId":"6YWhPS","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 catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. 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/42` 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 numerous other endpoints — metrics, reports, data export, insights, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — 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 spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is confirmed live (returns a valid 402 challenge), but without documentation it is unclear what specific functionality `/api/v1/transfers/42` provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available; /docs, /pricing, /api, and /README pages all render only 'Connect wallet'","No OpenAPI or JSON schema provided for any endpoint","The specific functionality of /api/v1/transfers/42 ('Premium API Access') is undocumented and unclear","The broad catalog of endpoints listed on the homepage cannot be independently verified for functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/42","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/42","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 challenge, confirming pricing and network details. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet' — and there is no OpenAPI spec, no request/response schema, and no examples. The purpose of the specific /transfers/42 endpoint is unclear beyond the generic 'Premium API Access' 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'/api/v1/transfers/42':96,230 '/docs':177 '/pricing':179 '/readme':181 '/request':19,38 '0.02':18,37,127,169 '000':116 '0x8335':121 '20':115 '2913':122 '402':219 '6':132 'Base network API' 'USDC API' 'accept':104 'access':102,237 'advertis':110 'ai':12,31,57 'ai-inference' 'analysi':147 'analyt':56 'api':5,24,45,83,101,236 'avail':207 'base':8,27,76,117,124 'beyond':232 'broad':50 'broader':135 'call':4,23,129 'catalog':51 'challeng':109,220 'classif':150 'classification' 'confirm':214 'connect':187 'content':193 'convers':162 'cost':113 'cover':10,29 'crawl':210 'crypto-paid API' 'data':11,30,55,143 'data-analytics' 'decim':133 'document':172,202,223 'embed':151 'embeddings' 'enabl':44 'endpoint':16,35,53,66,94,140,212 'equal':126 'estim':159 'exampl':206 'exchang':154 'export':144 'extrem':174 'feed':153 'financ':13,32,60 'finance-data' 'function':229 'gas':158 'generat':164 'generic':234 'geocod':160 'geocoding' 'infrastructur':63 'insight':145 'key':84 'label':238 'learn':59 'limit':87 'list':98,137 'live':215 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'maximum':112 'metric':141 'micropayment API' 'network':77 'numer':138 'offer':48 'openapi':197 'page':182 'paid':68 'pay':2,21 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request' 'per':3,22,70,128 'per-request':69 'platform':6,25,46,136 'point':171 'post':105 'premium':100,235 'price':152,170 'prompt':189 'protocol':81 'provid':231 'quot':157 'rate':86,155 'render':184 'report':142 'request':71,106 'request/response':200 'requir':91 'return':216 'schema':201 'sentiment':146 'sentiment-analysis' 'span':54 'spars':175 'spec':198 'specif':93,228 'subscript':90 'summar':149 'text':148 'text-summarization' 'token':156 'unclear':226 'unit':118 'usag':205 'usdc':9,28,73,120,130 'usdc-base-network' 'use':72,131 'util':15,34,64 'utility-services' 'valid':161,218 'via':78 'wallet':188 'web3':61 'without':222 'x402':43,80,108 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"be963273-d7f9-4f18-a020-3191061e6103","listingId":"a8fac2b5-1adf-4c1e-93f5-c485c28686ce","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/42","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:42.170Z"}],"sources":[{"listingId":"a8fac2b5-1adf-4c1e-93f5-c485c28686ce","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/42","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:42.170Z","lastSeenAt":"2026-04-22T15:02:24.782Z"}],"details":{"listingId":"a8fac2b5-1adf-4c1e-93f5-c485c28686ce","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/42 \\\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":"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 x402 challenge for /api/v1/transfers/42 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/42"},{"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, /api, /pricing, /README) render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"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","Running utility operations such as geocoding, validation, and data conversion on a per-call payment basis","Exporting data and generating analytics reports with no subscription commitment"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle payments in USDC on Base via x402","Projects needing low-cost, pay-as-you-go access to diverse API categories"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.332Z"},"updatedAt":"2026-04-22T15:02:24.782Z"}}