{"id":"7df1e984-92cf-4e0f-ac7b-c7100c503734","shortId":"F8Fvtb","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 set 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 upfront commitments. The specific endpoint at `/api/v1/transactions/220` 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 four categories of APIs: 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 x402 payment protocol — callers send a payment proof in the X-PAYMENT header and receive the response directly.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The actual behavior and output of the `/api/v1/transactions/220` endpoint is unclear — the description \"Premium API Access\" is generic and does not specify what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The specific endpoint /api/v1/transactions/220 has a generic description ('Premium API Access') — its actual functionality is unknown","No request or response examples are available anywhere in the crawled material","The broad range of advertised capabilities (AI, finance, analytics, utilities) cannot be verified due to lack of documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/220","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/transactions/220","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, confirming it accepts USDC payments on Base. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the endpoint name 'Premium API Access' is generic with no indication of what it actually returns. The platform lists many endpoints but provides no detail on any of 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'/request':13,28 '0.02':12,27,59,106 '000':100 '20':99 '402':94 '402 payment api' '6':110 'access':90,229 'actual':215 'advertis':116 'ai':128 'ai-inference' 'ai/ml':49 'analysi':132 'analyt':48,122 'api':5,20,37,71,89,120,183,228 'base':8,23,67,101,113 'base network api' 'behavior':216 'broad':42 'call':4,19 'caller':161 'categori':118 'challeng':95 'classif':135 'classification' 'commit':79 'connect':192 'content':198 'convers':152 'cost':58 'crypto-data' 'data':47,52,121,125,237 'data-analytics' 'decim':111 'descript':226 'detail':209 'direct':176 'doc':182 'document':177,210 'embed':136 'embeddings' 'enabl':36 'endpoint':45,57,82,155,213,222 'estim':146 'everi':56 'exampl':206 'exchang':141 'export':126 'extrem':179 'feed':140 'financ':137 'finance-data' 'finance/web3':51 'follow':156 'four':117 'function':239 'gas':145 'generat':153 'generic':231 'geocod':150 'geocoding' 'header':171 'i.e':105 'infer':50 'infrastructur':148 'insight':127 'key':72 'learn':130 'limit':75 'list':86 'low payment fee' 'lowpaymentfee.com':31 'machin':129 'metric':123 'micropayment api' 'network':9,24,68 'offer':40 'openapi':202 'output':218 'page':187 'paid':62 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':159,164,170 'per':3,18,60 'platform':6,21,38,115 'premium':88,227 'price':139,184 'prompt':194 'proof':165 'protocol':160 'provid':241 'quot':144 'rate':74,142 'readm':186 'receiv':173 'render':189 'report':124 'request':61,96 'request/response':205 'respons':175 'return':92 'schema':203 'send':162 'sentiment':131 'sentiment-analysis' 'servic':55 'set':43 'sinc':107 'span':46 'spars':180 'specif':81 'specifi':235 'summar':134 'text':133 'text-summarization' 'token':143 'unclear':224 'unit':102 'upfront':78 'usdc':15,30,64,104,108 'usdc api' 'usdc-base' 'use':109 'util':54,149 'utility-services' 'valid':151 'via':10,25 'wallet':193 'web3':138 'x':169 'x-payment':168 'x402':11,26,35,158 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"d527bd89-70e0-4692-ae1a-25bfd08d6013","listingId":"7df1e984-92cf-4e0f-ac7b-c7100c503734","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/transactions/220","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:22.842Z"}],"sources":[{"listingId":"7df1e984-92cf-4e0f-ac7b-c7100c503734","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/220","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:22.842Z","lastSeenAt":"2026-04-22T21:31:38.032Z"}],"details":{"listingId":"7df1e984-92cf-4e0f-ac7b-c7100c503734","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/220 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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/transactions/220 requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/220"},{"claim":"Platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no additional content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time finance and crypto data (prices, exchange rates, gas estimates) on a per-call basis","Running data analytics queries and exporting data with micropayments","Using utility services like geocoding, validation, and conversion via x402"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.391Z"},"updatedAt":"2026-04-22T21:31:38.032Z"}}