{"id":"80f2201b-063e-4e2e-ba84-eb5323c134b8","shortId":"t2bV8q","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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 `/api/v1/charges/274` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) 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 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 priced at $0.02 per request.\n\nHowever, documentation 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 description of what the `/api/v1/charges/274` endpoint specifically returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality \"Premium API Access\" actually provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/charges/274 ('Premium API Access') is undocumented and unclear","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/274","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/274","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","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 OpenAPI schema, no request/response examples, and the docs pages are empty ('Connect wallet' only). The specific functionality of '/api/v1/charges/274' ('Premium API Access') is completely undocumented, making this effectively a stub 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'/request':13,30 '0.02':12,29,82,153 '000':76 '20':75 '402':70,204 '402 payment api' 'accept':50 'access':66,96,218 'across':112 'actual':219 'advertis':87 'ai':122 'analysi':126 'analyt':116 'api':5,15,22,32,42,65,89,163,217 'attach':99 'base':8,25,55,77 'base network api' 'broader':108 'call':4,21,84 'categori':114 'challeng':71,205 'classif':129 'connect':172 'content':178 'convers':146 'data':115,119,213 'descript':189 'doc':162 'document':157,208 'embed':130 'endpoint':59,111,149,194,198 'estim':140 'exampl':186 'exchang':135 'export':120 'extrem':159 'feed':134 'financ':131 'four':113 'function':215 'gas':139 'generat':147 'geocod':144 'header':103 'howev':156 'i.e':81 'infrastructur':142 'insight':121 'instant':95 'json-response' 'key':16,33,90 'learn':124 'limit':93 'list':62 'live':200 'low payment fee' 'lowpaymentfee.com':35 'machin':123 'metric':117 'micropayment api' 'network':56 'no-api-key' 'offer':110 'openapi':182 'page':167 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,102 'per':3,20,40,83,154 'platform':6,23,43,86,109 'post-method' 'premium':64,216 'price':133,151,164 'prompt':174 'protocol':48 'provid':220 'quot':138 'rate':92,136 'readm':166 'render':169 'report':118 'request':41,72,106,155 'request/response':185 'requir':17,34 'return':68,196,201 'schema':183 'sentiment':125 'simpli':98 'spars':160 'specif':58,195 'summar':128 'text':127 'token':137 'unclear':211 'unit':78 'usdc':9,26,51,80 'usdc api' 'usdc-base-network' 'use':45 'util':143 'valid':145,203 'via':10,27 'wallet':173 'web3':132 'without':207 'x402':11,28,47,101 'x402 api' 'x402-payment'","prices":[{"id":"dd60738a-7540-43e1-b6f5-5661bc97dedb","listingId":"80f2201b-063e-4e2e-ba84-eb5323c134b8","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/274","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:48.448Z"}],"sources":[{"listingId":"80f2201b-063e-4e2e-ba84-eb5323c134b8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/274","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:48.448Z","lastSeenAt":"2026-04-24T12:03:21.386Z"}],"details":{"listingId":"80f2201b-063e-4e2e-ba84-eb5323c134b8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/274 \\\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 requesting up to 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/274"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/274"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API key registration","Agent-driven workflows that settle per-request via 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-as-you-go API access","Low-volume consumers who want no subscription commitment"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume production workloads where per-request pricing is cost-prohibitive compared to bulk plans","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.398Z"},"updatedAt":"2026-04-24T12:03:21.386Z"}}