{"id":"61546418-3c10-4f17-8484-d70fa8715912","shortId":"L7nFyf","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/171 is listed as \"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 X-PAYMENT header with a valid x402 payment proof to authenticate each request.\n\nThe broader platform offers 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02 per request price point.\n\nHowever, the specific endpoint /api/v1/payments/171 has no detailed documentation about what it returns or what input it expects beyond a POST request. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no further content. Without schema details or example responses, it is unclear what data or functionality this particular endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","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":["No documentation available for /api/v1/payments/171 — unclear what data or service it provides","All non-homepage pages (docs, pricing, API, README) render only 'Connect wallet' with no content","No OpenAPI spec, no input schema, no output schema, and no example responses available","The endpoint name 'Premium API Access' is generic and does not describe functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/171","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/171","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 on Base at $0.02/request. However, there is no documentation on what this specific endpoint does, no input/output schema, no example requests or responses, and the site's docs/pricing/API pages are empty beyond a wallet connect prompt. The listing title 'Premium API Access' is generic and 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'/request':13,28 '0.02':12,27,78,160 '000':73 '20':72 '402':67 '402 payment api' 'accept':46 'access':63,93 'across':117 'advertis':84 'ai':127 'analysi':131 'analyt':121 'api':5,20,38,62,86,191 'attach':96 'authent':109 'base':8,23,51,74 'base network api' 'beyond':183 'broader':113 'call':4,19,81 'categori':119 'challeng':68 'classif':134 'connect':200 'content':206 'convers':151 'data':120,124,217 'detail':172,209 'doc':188 'document':173 'embed':135 'endpoint':55,116,154,168,222 'estim':145 'exampl':211 'exchang':140 'expect':182 'export':125 'feed':139 'financ':136 'four':118 'function':219 'gas':144 'generat':152 'geocod':149 'header':101 'howev':165 'infrastructur':147 'input':180 'insight':126 'instant':92 'json-response' 'key':87 'learn':129 'limit':90 'list':59,156 'low payment fee' 'lowpaymentfee.com':31 'machin':128 'metric':122 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':115 'page':192 'particular':221 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,100,106 'per':3,18,36,80,161 'platform':6,21,39,83,114 'point':164 'post':185 'post-endpoint' 'premium':61 'price':138,163,189 'prompt':202 'proof':107 'protocol':44 'provid':223 'quot':143 'rate':89,141 'render':197 'report':123 'request':37,69,111,162,186 'respons':212 'return':65,177 'schema':208 'sentiment':130 'simpli':95 'site':195 'specif':54,167 'summar':133 'text':132 'token':142 'unclear':215 'unit':75 'usd':79 'usdc':15,30,47,77 'usdc api access' 'usdc-base-network' 'use':41 'util':148 'valid':104,150 'via':10,25 'wallet':201 'web3':137 'without':207 'x':99 'x-payment':98 'x402':11,26,43,105 'x402 api' 'x402-payment'","prices":[{"id":"ca23558b-7c8c-4e3a-89b8-d0427f1c5fdc","listingId":"61546418-3c10-4f17-8484-d70fa8715912","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/171","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:43.633Z"}],"sources":[{"listingId":"61546418-3c10-4f17-8484-d70fa8715912","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/171","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:43.633Z","lastSeenAt":"2026-04-24T05:32:16.794Z"}],"details":{"listingId":"61546418-3c10-4f17-8484-d70fa8715912","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/171 \\\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":"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/171"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API endpoints without subscription or API key management","Agent-driven workflows that need on-demand paid API calls settled in USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-per-use API access","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation and response schemas before integrating","High-volume use cases where per-request pricing may add up versus flat-rate plans","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.072Z"},"updatedAt":"2026-04-24T05:32:16.794Z"}}