{"id":"a68c28e1-2c8f-4131-8d8d-8a13babfe0c3","shortId":"dMXxEj","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/364` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — each request is paid individually via an X-PAYMENT header.\n\nThe broader platform advertises several API categories: 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 are listed at $0.02 per request. However, this specific listing is for the `/api/v1/payments/364` endpoint, whose exact functionality behind the \"Premium API Access\" label is not documented in detail.\n\nPayments settle on the Base L2 network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge confirms the endpoint is live and accepting payment-gated POST requests with a 300-second timeout. Documentation pages beyond the landing page returned only a \"Connect wallet\" prompt, so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment-gated","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","402 payment API"],"warnings":["The exact functionality behind 'Premium API Access' at /api/v1/payments/364 is undocumented — it is unclear what data or service this endpoint provides.","All documentation pages (/docs, /api, /pricing, /README) returned only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many API categories (AI, finance, analytics, etc.) but none are documented in detail."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/364","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/payments/364","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation of what \"Premium API Access\" actually returns, no request/response schema, and all doc pages beyond the landing page are empty. The exact functionality of this specific endpoint is 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'/request':13,28 '0.02':12,27,67,145 '000':71 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':181 '20':70 '300':199 '402 payment API' '6':77 'Base network API' 'USDC API access' 'accept':46,191 'access':62,164 'advertis':103 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,80,105,163 'base':8,23,51,72,175 'behind':160 'beyond':204 'broader':101 'call':4,19,69 'categori':106 'challeng':184 'charg':64 'classif':121 'commit':86 'confirm':185 'connect':211 'contract':180 'convers':138 'data':107,111 'decim':78 'detail':170,215 'document':168,202 'embed':122 'endpoint':55,141,156,187 'estim':132 'exact':158 'exchang':127 'export':112 'feed':126 'financ':123 'function':159 'gas':131 'gate':194 'generat':139 'geocod':136 'header':99 'howev':148 'individu':93 'infrastructur':134 'insight':113 'json-response' 'key':81 'l2':176 'label':59,165 'land':206 'learn':116 'limit':83 'list':143,151 'live':189 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment API' 'network':9,24,52,177 'no-api-key' 'page':203,207 'paid':92 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,98,171,193 'payment-g':192 'per':3,18,36,68,146 'platform':6,21,39,102 'post':195 'post-method' 'premium':60,162 'price':125 'prompt':213 'protocol':44 'quot':130 'rate':82,128 'report':110 'request':37,90,147,196 'request/response':216 'requir':88 'return':208 'schema':217 'second':200 'sentiment':117 'settl':172 'sever':104 'specif':54,150 'summar':120 'text':119 'timeout':201 'token':129 'unavail':219 'unit':73 'upfront':85 'usdc':15,30,47,75,179 'usdc-base-network' 'use':41,178 'util':135 'valid':137 'via':10,25,94 'wallet':212 'web3':124 'whose':157 'x':97 'x-payment':96 'x402':11,26,43,183 'x402 API' 'x402-payment-gated'","prices":[{"id":"6cdb4de4-1a1d-488c-badc-28c66aae10d4","listingId":"a68c28e1-2c8f-4131-8d8d-8a13babfe0c3","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/payments/364","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:31.411Z"}],"sources":[{"listingId":"a68c28e1-2c8f-4131-8d8d-8a13babfe0c3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/364","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:31.411Z","lastSeenAt":"2026-04-23T11:03:35.107Z"}],"details":{"listingId":"a68c28e1-2c8f-4131-8d8d-8a13babfe0c3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/364 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/payments/364"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/364"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/364"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API endpoints without creating accounts or managing API keys","Making one-off paid API calls from autonomous agents using USDC on Base","Integrating pay-as-you-go API access into Web3 workflows"],"bestFor":["Agents or developers who want zero-signup, per-call API access","Users already holding USDC on the Base network","Scenarios requiring low-friction micropayments for API calls"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who prefer subscription-based pricing over per-call fees","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.811Z"},"updatedAt":"2026-04-23T11:03:35.107Z"}}