{"id":"ec2fb668-d657-41a2-bc5e-01d38c446799","shortId":"rxHUhK","kind":"x402","title":"x402-gated backup/data endpoint on Base, paying $0.02 per request in USDC.","tagline":"x402-gated backup/data endpoint on Base, paying $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" to a backup resource dated 2025-07, gated behind the x402 payment protocol. The endpoint returns a 402 challenge requiring a one-time USDC payment on the Base network. The maxAmountRequired is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 exact scheme to the specified wallet address, with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform advertises a range of x402-gated API categories including 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. However, this specific listing is for the `/api/v1/backups/2025-07` path, which is not among the publicly listed APIs on the homepage and its exact functionality is unclear — the name suggests it returns some form of backup data for July 2025.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 backup endpoint actually returns. The endpoint is confirmed live via the 402 challenge, but the lack of documentation makes it difficult to assess what data or service is actually delivered upon payment.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","backup-data","no-api-key"],"categories":["storage","data"],"synonyms":["x402 backup API","pay-per-call data endpoint","USDC gated API","Base network API","lowpaymentfee backup","micropayment API"],"warnings":["The /api/v1/backups/2025-07 path is not listed among the provider's publicly advertised APIs — its purpose is unknown.","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no usable content.","No OpenAPI schema, no request body schema, and no response examples are available.","The nature of the 'backup' data returned is entirely unspecified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2025-07","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/2025-07","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific backup endpoint is not listed among the provider's public APIs. The purpose and output of this endpoint are 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'/api':203 '/api/v1/backups/2025-07':164 '/docs':201 '/pricing':202 '/readme':205 '0.02':9,22,78,154 '000':69 '20':68 '2025':40,195 '402':52,243 '6':74 'Base network API' 'USDC gated API' 'access':34 'actual':234,260 'address':93 'advertis':106 'ai':123 'among':169 'analysi':127 'analyt':117 'api':33,96,113,173 'assess':254 'backup':37,191,232 'backup-data' 'backup/data':4,17 'base':7,20,63,70 'base-network' 'behind':43 'broader':103 'categori':114 'challeng':53,244 'classif':130 'confirm':239 'connect':211 'content':217 'convers':147 'data':116,120,192,256 'date':39 'decim':75 'deliv':261 'descript':228 'difficult':252 'document':196,249 'embed':131 'endpoint':5,18,28,49,150,233,237 'equal':77 'estim':141 'exact':87,179 'exampl':225 'exchang':136 'export':121 'extrem':198 'feed':135 'financ':132 'form':189 'function':180 'gas':140 'gate':3,16,42,112 'generat':148 'geocod':145 'homepag':176 'howev':157 'includ':115 'infrastructur':143 'insight':122 'juli':194 'key':97 'lack':247 'learn':125 'limit':100 'list':152,160,172 'live':240 'lowpaymentfee backup' 'lowpaymentfee.com':30,104 'machin':124 'made':83 'make':250 'maxamountrequir':66 'metric':118 'micropayment API' 'name':184 'network':64 'no-api-key' 'one':57 'one-tim':56 'openapi':221 'page':206 'path':165 'pay':8,21 'pay-per-call data endpoint' 'pay-per-request' 'payment':46,60,81,263 'per':10,23,79,155 'platform':105 'premium':32 'price':134 'prompt':213 'protocol':47 'provid':31 'public':171 'quot':139 'rang':108 'rate':99,137 'render':208 'report':119 'request':11,24,80,156 'request/response':224 'requir':54,101 'resourc':38 'return':50,187,235 'schema':222 'scheme':88 'sentiment':126 'servic':258 'spars':199 'specif':159 'specifi':91 'substant':216 'suggest':185 'summar':129 'text':128 'time':58 'token':138 'unclear':182 'unit':71 'upon':262 'usdc':13,26,59,73 'usdc-settlement' 'util':144 'valid':146 'via':84,241 'wallet':92,212 'web3':133 'x402':2,15,45,86,111 'x402 backup API' 'x402-gated':1,14,110 'x402-payment'","prices":[{"id":"b1e7463d-5948-483a-818b-f6f5bc4a8ba3","listingId":"ec2fb668-d657-41a2-bc5e-01d38c446799","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/2025-07","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:16.745Z"}],"sources":[{"listingId":"ec2fb668-d657-41a2-bc5e-01d38c446799","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2025-07","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:16.745Z","lastSeenAt":"2026-04-22T13:32:03.179Z"}],"details":{"listingId":"ec2fb668-d657-41a2-bc5e-01d38c446799","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2025-07 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","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/backups/2025-07"},{"claim":"All listed APIs 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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2025-07"}],"useCases":["Retrieving backup data for July 2025 via a single paid request","Programmatic access to backup archives without API key management","Agent-driven data retrieval with per-call USDC micropayments"],"bestFor":["Developers wanting keyless, pay-per-use backup data access","AI agents that can settle x402 payments on Base","Users who need one-off backup retrieval without subscriptions"],"notFor":["Anyone needing detailed documentation or schema before purchasing","Bulk or high-frequency data retrieval where per-call costs add up","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.388Z"},"updatedAt":"2026-04-22T13:32:03.179Z"}}