{"id":"1adc1a72-b35f-4e78-82c8-03823266fe9a","shortId":"t8ENrf","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 pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities. All endpoints are priced at $0.02 per request, paid in USDC on the Base network using the x402 payment protocol. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific endpoint at `/api/v1/charges/24` 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) on Base. 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 schema, no request/response examples, and no detailed documentation for any endpoint. The endpoint is confirmed live via a valid 402 challenge, but the actual behavior behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-services"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","no-auth api","lowpaymentfee"],"warnings":["No API documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or JSON schema provided for any endpoint","The specific purpose of /api/v1/charges/24 ('Premium API Access') is unclear and not described anywhere","No request or response examples are available; actual endpoint behavior behind the paywall is unknown","The broad catalog of advertised endpoints (AI, finance, analytics, etc.) cannot be verified for functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/24","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/charges/24","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 schema, no request/response examples, and all documentation pages are empty beyond a wallet-connect prompt. The actual functionality behind 'Premium API Access' at /api/v1/charges/24 is unspecified. This is effectively a stub 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'/request':13,30 '0.02':12,29,69,133,136 '000':128 '20':127 '402':122,221 'access':118 'across':54 'actual':225 'advertis':141 'ai':151 'ai-inference' 'ai/ml':57 'analysi':155 'analyt':56,145 'api':5,15,22,32,41,85,117,182 'attach':96 'base':8,25,77,129,138 'base network api' 'behavior':226 'behind':227 'broad':46 'call':4,21 'caller':94 'catalog':47 'categori':142 'challeng':123,222 'classif':158 'classification' 'commit':91 'confirm':216 'connect':191 'content':197 'convers':174 'data':55,60,144,148 'data-analytics' 'detail':208 'doc':181 'document':176,209 'embed':159 'embeddings' 'enabl':40 'endpoint':53,65,110,212,214 'estim':169 'exampl':205 'exchang':164 'export':149 'extrem':178 'feed':163 'financ':160 'finance-data' 'finance/web3':59 'gas':168 'generat':175 'geocod':172 'geocoding' 'header':101 'i.e':135 'includ':143 'infer':58 'infrastructur':62,171 'insight':150 'key':16,33,86 'learn':153 'limit':88 'list':114 'live':217 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':152 'metric':146 'micropayment api' 'network':9,26,78 'no-api-key' 'no-auth api' 'offer':44 'openapi':201 'page':186 'paid':72 'pay':2,19,50 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':49 'payment':82,100,106 'paywal':229 'per':3,20,51,70 'platform':6,23,42,140 'premium':116 'price':67,162,183 'prompt':193 'proof':107 'protocol':83 'quot':167 'rate':87,165 'readm':185 'render':188 'report':147 'request':52,71,124 'request/response':204 'requir':17,34,93 'return':120 'schema':202 'sentiment':154 'sentiment-analysis' 'simpli':95 'spars':179 'specif':109 'summar':157 'text':156 'text-summarization' 'token':166 'unit':130 'unknown':231 'upfront':90 'usdc':74,132,134 'usdc api' 'usdc-base' 'use':79 'util':63 'utility-services' 'valid':104,173,220 'via':10,27,218 'wallet':192 'web3':161 'x':99 'x-payment':98 'x402':11,28,39,81,105 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"5fac7cc5-3991-482a-b58d-e15c04b9fa61","listingId":"1adc1a72-b35f-4e78-82c8-03823266fe9a","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/charges/24","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:44.762Z"}],"sources":[{"listingId":"1adc1a72-b35f-4e78-82c8-03823266fe9a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/24","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:44.762Z","lastSeenAt":"2026-04-23T09:31:00.566Z"}],"details":{"listingId":"1adc1a72-b35f-4e78-82c8-03823266fe9a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/24 \\\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 priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/24"},{"claim":"Categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call payment basis","Exporting analytics data and generating insights reports"],"bestFor":["Agents or developers who want instant API access without signup or key provisioning","Low-volume or bursty workloads where per-request pricing is more efficient than subscriptions","x402-compatible agents that can settle USDC micropayments on Base"],"notFor":["High-volume production workloads where $0.02/request adds up significantly","Users who need detailed API documentation, schemas, or SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.545Z"},"updatedAt":"2026-04-23T09:31:00.566Z"}}