{"id":"bebd47fd-dccf-4c3c-8699-89719e73f1a7","shortId":"Quqy96","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/160` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform lists endpoints across four 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request. However, the specific functionality behind the `/api/v1/payments/160` endpoint is not documented beyond its \"Premium API Access\" label, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail.\n\nBecause the crawled documentation is essentially empty (only the landing page provides meaningful content), the actual input/output schemas, supported parameters, and concrete response formats for this endpoint remain unknown. Agents should treat this as a live x402 endpoint but be aware that the exact payload it expects and returns is undocumented.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are empty — only show 'Connect wallet'","No input or output schema documented for /api/v1/payments/160","The label 'Premium API Access' is generic and does not describe what the endpoint actually does","No OpenAPI spec, no examples, no error documentation available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/160","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/160","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, but there is virtually no documentation: the docs, pricing, API, and README pages all render only 'Connect wallet'. The input/output schema, expected request body, and response format for this specific endpoint are completely unknown. Only the landing page provides any useful 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'/request':13,28 '0.02':12,27,77,148 '000':72 '20':71 '402':66 '402 payment api' 'accept':46 'access':62,92,166 'across':108 'actual':201 'advertis':83 'agent':215 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,165,173 'attach':95 'awar':226 'base':8,23,51,73 'base network api' 'behind':155 'beyond':162 'broader':104 'call':4,19,80 'categori':110 'challeng':67 'classif':125 'concret':207 'connect':179 'content':199 'convers':141 'crawl':188 'data':111,115 'detail':185 'doc':170 'document':161,189 'embed':126 'empti':192 'endpoint':55,107,144,158,212,223 'essenti':191 'estim':136 'exact':229 'exchang':131 'expect':232 'export':116 'feed':130 'financ':127 'format':209 'four':109 'function':154 'gas':135 'generat':142 'geocod':139 'header':99 'howev':151 'infrastructur':138 'input/output':202 'insight':117 'instant':91 'json-response' 'key':86 'label':59,167 'land':195 'learn':120 'limit':89 'list':106 'live':221 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'meaning':198 'metric':113 'micropayment api' 'network':9,24,52 'no-api-key' 'page':174,196 'paramet':205 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payload':230 'payment':48,98 'per':3,18,36,79,149 'platform':6,21,39,82,105 'premium':60,164 'price':129,146,171 'prompt':181 'protocol':44 'provid':197 'quot':134 'rate':88,132 'remain':213 'render':176 'report':114 'request':37,68,102,150 'respons':208 'return':64,234 'schema':203 'sentiment':121 'simpli':94 'specif':54,153 'summar':124 'support':204 'text':123 'token':133 'treat':217 'undocu':236 'unit':74 'unknown':214 'usd':78 'usdc':15,30,47,76 'usdc api access' 'usdc-base-network' 'use':41 'valid':140 'via':10,25 'wallet':180 'web3':128 'x402':11,26,43,97,222 'x402 api' 'x402-payment'","prices":[{"id":"4af9db3e-9287-483d-b6dc-1fc531427ec8","listingId":"bebd47fd-dccf-4c3c-8699-89719e73f1a7","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/160","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:34.739Z"}],"sources":[{"listingId":"bebd47fd-dccf-4c3c-8699-89719e73f1a7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/160","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:34.739Z","lastSeenAt":"2026-04-24T06:32:15.643Z"}],"details":{"listingId":"bebd47fd-dccf-4c3c-8699-89719e73f1a7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/160 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/160"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic pay-per-call access to API services without registration or API keys","Agent-driven workflows that need on-demand API access settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads requiring well-documented schemas and error handling","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.524Z"},"updatedAt":"2026-04-24T06:32:15.643Z"}}