{"id":"40e07773-0759-47f6-a36c-513c583f1a8d","shortId":"zd2mBe","kind":"x402","title":"Pay-per-request data import endpoint on Base via x402, priced at $0.02 per call in USDC.","tagline":"Pay-per-request data import endpoint on Base via x402, priced at $0.02 per call in USDC.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/import` is labeled \"Premium API Access\" and accepts HTTP POST requests. Payment is $0.02 per call (20,000 base units of USDC with 6 decimals), settled on-chain to a specified wallet address. No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises endpoints across four categories: Data & Analytics (metrics, reports, 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/request price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/import` endpoint actually accepts or returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality the import endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","http-post","pay-per-request","data-import"],"categories":["data","infrastructure"],"synonyms":["data import API","x402 API","USDC micropayment API","Base network API","pay-per-call API","lowpaymentfee","premium API access"],"warnings":["No documentation available — all doc/pricing/API/README pages render only 'Connect wallet'","No OpenAPI or input/output schema provided for the /api/v1/import endpoint","The purpose and expected payload of the 'import' endpoint is completely undocumented","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/import","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/import","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 pricing and network details. However, documentation is effectively nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/import endpoint actually does or accepts. This is essentially a stub 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'/request':169 '0.02':14,32,76,168 '000':80 '20':79 '402':222 '6':86 'Base network API' 'USDC micropayment API' 'accept':70,211 'access':68 'across':126 'actual':210 'address':96 'advertis':124 'ai':135 'analysi':139 'analyt':130 'api':46,67,98,178 'attach':109 'base':9,27,55,81 'base-network' 'broader':122 'call':16,34,78 'caller':107 'categori':128 'chain':91 'challeng':223 'classif':142 'collect':40 'commit':104 'confirm':217 'connect':187 'content':193 'convers':159 'data':5,23,129,231 'data import API' 'data-import' 'decim':87 'descript':204 'doc':177 'document':172,226 'embed':143 'endpoint':7,25,47,61,125,162,209,215,236 'estim':153 'exampl':201 'exchang':148 'export':133 'extrem':174 'feed':147 'financ':144 'four':127 'function':233 'gas':152 'generat':160 'geocod':157 'header':114 'host':38 'http':71 'http-post' 'import':6,24,235 'infrastructur':155 'insight':134 'key':99 'label':65 'learn':137 'limit':101 'list':164 'live':218 'lowpaymentfee' 'lowpaymentfee.com':37 'machin':136 'metric':131 'network':56 'on-chain':89 'openapi':197 'page':182 'pay':2,20,43 'pay-per-call API' 'pay-per-request':1,19,42 'payment':74,113,119 'per':3,15,21,33,44,77 'platform':123 'point':171 'post':72 'premium':66 'premium API access' 'price':12,30,146,170,179 'prompt':189 'proof':120 'proper':221 'protocol':52 'provid':237 'quot':151 'rate':100,149 'readm':181 'render':184 'report':132 'request':4,22,45,73 'request/response':200 'requir':106 'return':213,219 'schema':198 'sentiment':138 'settl':48,88 'simpli':108 'spars':175 'specif':60 'specifi':94 'substant':192 'summar':141 'text':140 'token':150 'unclear':229 'unit':82 'upfront':103 'usdc':18,36,58,84 'usdc-settlement' 'use':57 'util':156 'valid':117,158 'via':10,28,49 'wallet':95,188 'web3':145 'without':225 'x':112 'x-payment':111 'x402':11,29,51,118 'x402 API' 'x402-payment'","prices":[{"id":"aa126810-b248-41a1-9ec4-7a23464ff7a6","listingId":"40e07773-0759-47f6-a36c-513c583f1a8d","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/import","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:37:52.426Z"}],"sources":[{"listingId":"40e07773-0759-47f6-a36c-513c583f1a8d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/import","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:37:52.426Z","lastSeenAt":"2026-04-28T15:05:19.384Z"}],"details":{"listingId":"40e07773-0759-47f6-a36c-513c583f1a8d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/import \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/import"},{"claim":"All endpoints are priced at $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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Importing data via a pay-per-request model without API key management","Agent-driven workflows that need on-chain payment settlement per API call","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol on Base","Agents that need keyless, pay-as-you-go API access","Low-cost per-request data operations settled in USDC"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume batch operations where per-request pricing is inefficient","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:43.718Z"},"updatedAt":"2026-04-28T15:05:19.384Z"}}