{"id":"062577c6-a4af-4cdd-ae1d-24ff88542623","shortId":"AXJuy4","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay-per-request with USDC at $0.02/call.","tagline":"x402-gated backup/data endpoint on Base, pay-per-request with USDC at $0.02/call.","description":"This endpoint at lowpaymentfee.com provides access to a backup resource (`/api/v1/backups/2024-03`) behind an x402 payment wall. The site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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, settled in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint being listed here — `/api/v1/backups/2024-03` — is described only as \"Premium API Access\" and appears to serve a backup or archived dataset for March 2024. The x402 challenge confirms it is live, accepting POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD) on Base. No API keys or rate limits are advertised; access is granted purely through per-call micropayments.\n\nDocumentation is extremely sparse. The docs, pricing, API, 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 backup resource actually returns. The endpoint is confirmed live via the 402 challenge, but the actual payload and use case remain unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","backup-data","json-response","no-api-key","micropayment"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","archived data API","premium API access","x402 micropayment API","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — docs, pricing, API, and README pages all show only 'Connect wallet' with no content.","No OpenAPI or schema describing request parameters or response format for this endpoint.","The purpose and contents of '/api/v1/backups/2024-03' are undocumented; 'Premium API Access' is the only description.","Cannot verify what data is actually returned without making a paid request."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2024-03","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/2024-03","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of the 'backups/2024-03' resource is entirely unexplained. The docs pages are empty beyond a wallet-connect 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'/call':16,32 '0.02':15,31,93,156 '000':151 '20':150 '2024':132 '402':224 'Base USDC API' 'accept':140 'access':38,120,168 'actual':215,228 'advertis':167 'ai/ml':64 'analysi':67 'analyt':63 'api':60,119,161,184 'appear':122 'archiv':128 'archived data API' 'backup':41,126,213 'backup API' 'backup-data' 'backup/data':4,20 'base':7,23,101,152,159 'behind':44 'broad':53 'call':175 'case':232 'catalog':54 'challeng':135,225 'classif':69 'confirm':136,220 'connect':192 'content':198 'convers':86 'data':62 'data backup endpoint' 'dataset':129 'describ':115 'descript':209 'doc':182 'document':177 'embed':70 'endpoint':5,21,34,89,109,218 'estim':80 'exampl':206 'exchang':75 'extrem':179 'feed':74 'financ':71 'gas':79 'gate':3,19 'generat':87 'geocod':84 'grant':170 'host':51 'infer':65 'infrastructur':82 'json-response' 'key':162 'limit':165 'list':111 'live':139,221 'lowpaymentfee' 'lowpaymentfee.com':36 'march':131 'micropay':176 'micropayment' 'network':102 'no-api-key' 'openapi':202 'page':187 'pay':9,25,57 'pay-per-request':8,24,56 'payload':229 'payment':47,146 'per':10,26,58,94,174 'per-cal':173 'post':141 'premium':118 'premium API access' 'price':73,91,183 'prompt':194 'protocol':106 'provid':37 'pure':171 'quot':78 'rate':76,164 'readm':186 'remain':233 'render':189 'request':11,27,59,95,142 'request/response':205 'requir':144 'resourc':42,214 'return':216 'schema':203 'sentiment':66 'serv':124 'settl':96 'site':50 'span':61 'spars':180 'specif':108 'summar':68 'token':77 'unclear':234 'unit':153 'usd':157 'usdc':13,29,98,155 'usdc-base' 'use':231 'util':83 'valid':85 'via':103,222 'wall':48 'wallet':193 'web3':72 'x402':2,18,46,105,134 'x402 micropayment API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"e9123e1e-178a-4e13-b7a4-d176c9b29b9c","listingId":"062577c6-a4af-4cdd-ae1d-24ff88542623","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/2024-03","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:52.229Z"}],"sources":[{"listingId":"062577c6-a4af-4cdd-ae1d-24ff88542623","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2024-03","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:52.229Z","lastSeenAt":"2026-04-22T16:32:26.024Z"}],"details":{"listingId":"062577c6-a4af-4cdd-ae1d-24ff88542623","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2024-03 \\\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 x402Version 1, accepting USDC on Base with maxAmountRequired of 20000 base units (0.02 USD).","source_url":"https://lowpaymentfee.com/api/v1/backups/2024-03"},{"claim":"All APIs on the site are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving archived or backup data for March 2024 via a single micropayment","Agent-driven data access without API key provisioning","Pay-per-call data retrieval settled on Base L2"],"bestFor":["Agents needing keyless, on-demand access to backup datasets","Developers experimenting with x402 micropayment flows","Scenarios where per-request billing is preferred over subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Bulk data retrieval where per-request pricing would be cost-inefficient","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.016Z"},"updatedAt":"2026-04-22T16:32:26.024Z"}}