{"id":"378828ce-3b58-4176-9430-9224553dee01","shortId":"ZfEwZJ","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 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 commitments required. The specific endpoint at `/api/v1/customers/75` is labeled \"Premium API Access\" and returns JSON via POST.\n\nThe platform advertises four main 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, where callers attach an X-PAYMENT header with a signed USDC payment on Base to authenticate and pay in a single step.\n\nThe probed endpoint (`/api/v1/customers/75`) returned a valid 402 challenge with a maxAmountRequired of 20000 base units of USDC (0x8335… on Base, 6 decimals), which equals $0.02. The payment is settled to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. Documentation pages beyond the landing page were essentially empty (showing only \"Connect wallet\"), so the actual response schemas and detailed API behavior are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-api-key endpoint","crypto pay api"],"warnings":["Documentation pages (/docs, /pricing, /README, /api) are effectively empty — only show 'Connect wallet'","No OpenAPI or schema available; response format for this endpoint is unknown","The endpoint path '/api/v1/customers/75' suggests customer-specific data but its actual function is undocumented","The broad catalog of advertised endpoints (AI, finance, analytics, utils) could not be independently verified beyond the landing page listing"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/75","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/customers/75","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 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond the landing page, no example request/response bodies, and the specific purpose of `/api/v1/customers/75` is unclear. The docs, pricing, and README pages all returned only 'Connect wallet' with no useful 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'/request':13,28 '0.02':12,27,59,191 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':198 '0x8335':184 '20000':179 '300':201 '402':173 '6':187 'access':89 'actual':219 'address':197 'advertis':97 'ai':110 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':49 'analysi':114 'analyt':48,104 'api':5,20,37,71,88,102,224 'attach':145 'authent':159 'base':8,23,67,157,180,186 'base network api' 'behavior':225 'beyond':206 'broad':42 'call':4,19 'caller':144 'catalog':43 'categori':100 'challeng':174 'classif':117 'commit':78 'connect':215 'convers':134 'conversion' 'cost':58 'crypto pay api' 'crypto-gas-estimates' 'data':47,52,103,107 'data-analytics' 'decim':188 'detail':223 'document':204 'embed':118 'empti':212 'enabl':36 'endpoint':45,57,82,137,168 'equal':190 'essenti':211 'estim':128 'everi':56 'exchang':123 'exchange-rates' 'export':108 'feed':122 'financ':119 'finance-price-feeds' 'finance/web3':51 'follow':138 'four':98 'gas':127 'generat':135 'geocod':132 'geocoding' 'header':150 'infer':50 'infrastructur':130 'insight':109 'json':92 'key':72 'label':86 'land':208 'learn':112 'limit':75 'low payment fee' 'lowpaymentfee.com':31 'machin':111 'main':99 'maxamountrequir':177 'metric':105 'micropayment api' 'network':9,24,68 'no-api-key endpoint' 'offer':40 'page':205,209 'paid':62 'pay':2,17,161 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':141,149,155,193 'per':3,18,60 'platform':6,21,38,96 'post':94 'premium':87 'price':121 'probe':167 'protocol':142 'quot':126 'rate':74,124 'report':106 'request':61 'requir':79 'respons':220 'return':91,170 'schema':221 'second':202 'sentiment':113 'servic':55 'settl':195 'show':213 'sign':153 'singl':164 'span':46 'specif':81 'step':165 'summar':116 'text':115 'timeout':203 'token':125 'unit':181 'unknown':227 'usdc':15,30,64,154,183 'usdc api' 'usdc-base-network' 'util':54,131 'valid':133,172 'validation' 'via':10,25,93 'wallet':216 'web3':120 'x':148 'x-payment':147 'x402':11,26,35,140 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"288adf51-c1c2-4667-9387-f3cf06b37cb1","listingId":"378828ce-3b58-4176-9430-9224553dee01","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/customers/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:59.039Z"}],"sources":[{"listingId":"378828ce-3b58-4176-9430-9224553dee01","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:59.039Z","lastSeenAt":"2026-04-22T20:00:37.335Z"}],"details":{"listingId":"378828ce-3b58-4176-9430-9224553dee01","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/75 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","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 platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/customers/75 requires 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with a 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/75"}],"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 data analytics queries and exporting reports on a per-request payment basis","Using utility services like geocoding and data validation with instant crypto micropayments","Building agent workflows that pay per call via x402 on Base"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Projects needing low-cost micropayment-gated endpoints without rate limits"],"notFor":["Users who need detailed API documentation or response schemas before integrating","Applications requiring fiat-only payment rails with no crypto involvement","High-volume batch workloads where per-request pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.328Z"},"updatedAt":"2026-04-22T20:00:37.335Z"}}