{"id":"00f4a010-8f0c-4102-9632-185a57352213","shortId":"NWKNV7","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02 per request.","tagline":"x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides a pay-per-request API behind the x402 payment protocol. The specific resource `/api/v1/backups/43` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (6 decimals), which equals $0.02 per request.\n\nThe broader lowpaymentfee.com platform offers a suite of endpoints spanning 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 with no API keys, no rate limits, and no minimum commitments required. Payments are made via the x402 protocol using USDC on the Base L2 network.\n\nThe specific `/api/v1/backups/43` endpoint's purpose is not well-documented — the name suggests a backup or data retrieval resource, but no schema or documentation describes the request body format or response structure. The docs, pricing, and API pages on the site only render a \"Connect wallet\" prompt with no additional technical detail. Without an OpenAPI spec or response examples, the exact functionality of this particular endpoint remains unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-endpoint","no-api-key","backup-data"],"categories":["storage","infrastructure"],"synonyms":["premium API access","backup endpoint","x402 USDC API","lowpaymentfee","pay-per-call API","Base network API","data backup API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The purpose of /api/v1/backups/43 is not explained anywhere in the crawled content","Docs, pricing, and API pages only show 'Connect wallet' with no technical details","Request body format and response structure are entirely unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/43","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/backups/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documentation of request/response schemas, and the specific purpose of /api/v1/backups/43 is unclear. The site's docs pages render only a wallet-connect prompt with no technical 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'0.02':15,32,90,141 '000':81 '20':80 '6':86 'Base network API' 'accept':61 'access':59 'addit':220 'advertis':75 'ai':110 'amount':78 'analysi':114 'analyt':104 'api':45,58,146,207 'backup':185 'backup endpoint' 'backup-data' 'backup/data':4,21 'base':7,24,70,82,167 'base-network' 'behind':46 'bodi':198 'broader':94 'call':11,28 'challeng':74 'classif':117 'commit':154 'connect':215 'convers':134 'data':103,107,187 'data backup API' 'decim':87 'describ':195 'detail':222 'doc':204 'document':180,194 'embed':118 'endpoint':5,22,36,101,137,173,236 'equal':89 'estim':128 'exact':231 'exampl':229 'exchang':123 'export':108 'feed':122 'financ':119 'format':199 'function':232 'gas':127 'gate':3,20 'generat':135 'geocod':132 'infrastructur':130 'insight':109 'key':147 'l2':168 'label':56 'learn':112 'limit':150 'list':139 'lowpaymentfee' 'lowpaymentfee.com':38,95 'machin':111 'made':158 'maximum':77 'metric':105 'minimum':153 'name':182 'network':71,169 'no-api-key' 'offer':97 'openapi':225 'page':208 'particular':235 'pay':9,26,42 'pay-per-cal':8,25 'pay-per-call API' 'pay-per-request':41 'payment':49,65,156 'per':10,16,27,33,43,91,142 'platform':96 'post':62 'post-endpoint' 'premium':57 'premium API access' 'price':121,205 'prompt':217 'protocol':50,162 'provid':39 'purpos':175 'quot':126 'rate':124,149 'remain':237 'render':213 'report':106 'request':17,34,44,63,92,143,197 'requir':155 'resourc':53,189 'respons':201,228 'retriev':188 'schema':192 'sentiment':113 'settl':64 'site':211 'span':102 'spec':226 'specif':52,171 'structur':202 'suggest':183 'suit':99 'summar':116 'technic':221 'text':115 'token':125 'unclear':238 'unit':83 'usdc':13,30,67,85,164 'usdc-settlement' 'use':163 'util':131 'valid':133 'via':159 'wallet':216 'web3':120 'well':179 'well-docu':178 'without':223 'x402':2,19,48,73,161 'x402 USDC API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f0e8b95a-8855-4784-9eb9-4f5524e2b3d3","listingId":"00f4a010-8f0c-4102-9632-185a57352213","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/backups/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:24.529Z"}],"sources":[{"listingId":"00f4a010-8f0c-4102-9632-185a57352213","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:24.529Z","lastSeenAt":"2026-04-22T10:32:34.256Z"}],"details":{"listingId":"00f4a010-8f0c-4102-9632-185a57352213","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/43 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (USD Coin) on the Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/43"},{"claim":"All 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"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/43"}],"useCases":["Retrieving backup data or stored resources via a single paid API call","Programmatic access to premium content without API key management","Agent-driven data retrieval with automatic micropayment settlement"],"bestFor":["Developers wanting key-free, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users needing low-cost per-request data access without subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume batch operations where per-request pricing may add up","Anyone requiring non-USDC or non-Base payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.007Z"},"updatedAt":"2026-04-22T10:32:34.256Z"}}