{"id":"55b68c76-a74b-452d-9dbb-d87677a44f43","shortId":"zkucu8","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC.","tagline":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides access to a backup resource (`/api/v1/backups/2024-09`) behind an x402 paywall. The provider operates a broad catalog of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated via the x402 protocol on the Base network. Each request costs $0.02 in USDC (USD Coin), with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint probed (`/api/v1/backups/2024-09`) is described only as \"Premium API Access\" and returns `application/json`. Based on the URL path, it likely serves a dated backup or snapshot resource for September 2024, but the provider offers no further documentation on what data is contained in this particular endpoint. The x402 challenge confirms the endpoint is live, accepting POST requests, settling payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC on Base (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`), with a maximum timeout of 300 seconds.\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 backup data contains or what POST body is expected. The provider's landing page lists many other endpoints but does not specifically list or describe this backup endpoint.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","json-response","pay-per-request","backup-data"],"categories":["storage","data"],"synonyms":["x402 backup API","pay-per-call data endpoint","USDC gated API","Base network API","lowpaymentfee backup","premium data access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The specific /api/v1/backups/2024-09 endpoint is not listed on the provider's landing page among their advertised APIs.","No request or response schema is available; the expected POST body is unknown.","The nature and contents of the 'backup' data are completely undocumented."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2024-09","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/2024-09","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what this backup endpoint actually returns, what request body it expects, or what the backup data contains. No OpenAPI schema, no examples, and all doc pages are 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'0.02':9,22,77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':163 '2024':125 '300':169 'Base network API' 'USDC gated API' 'accept':150 'access':32,105 'address':156 'ai/ml':57 'analyt':56 'api':53,84,104,177 'application/json':108 'backup':35,119,207,233 'backup-data' 'backup/data':4,17 'base':7,20,72,109,161 'base-network' 'behind':38 'bodi':213 'broad':46 'call':52 'catalog':47 'challeng':144 'coin':81 'commit':92 'confirm':145 'connect':186 'contain':137,209 'content':192 'contract':162 'cost':76 'crypto-paid API' 'data':55,60,135,208 'date':118 'describ':100,231 'descript':203 'doc':176 'document':132,171 'endpoint':5,18,28,96,141,147,224,234 'exampl':200 'expect':215 'extrem':173 'finance/web3':59 'gate':3,16,65 'infer':58 'infrastructur':62 'json-response' 'key':85 'land':219 'like':115 'limit':88 'list':221,229 'live':149 'lowpaymentfee backup' 'lowpaymentfee.com':30 'mani':222 'maximum':166 'minimum':91 'network':73 'offer':129 'openapi':196 'oper':44 'page':181,220 'particular':140 'path':113 'pay':8,21,50 'pay-per-cal':49 'pay-per-call data endpoint' 'pay-per-request' 'payment':154 'paywal':41 'per':10,23,51 'post':151,212 'premium':103 'premium data access' 'price':178 'probe':97 'prompt':188 'protocol':69 'provid':31,43,128,217 'rate':87 'readm':180 'render':183 'request':11,24,75,152 'request/response':199 'requir':93 'resourc':36,122 'return':107 'schema':197 'second':170 'septemb':124 'serv':116 'settl':153 'snapshot':121 'span':54 'spars':174 'specif':95,228 'substant':191 'timeout':167 'url':112 'usd':80 'usdc':13,26,79,159 'usdc-settlement' 'use':158 'util':63 'via':66 'wallet':187 'x402':2,15,40,68,143 'x402 backup API' 'x402-gated':1,14 'x402-payment'","prices":[{"id":"72e6a3da-479f-40a5-9836-b7c611b4330b","listingId":"55b68c76-a74b-452d-9dbb-d87677a44f43","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/2024-09","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:14.907Z"}],"sources":[{"listingId":"55b68c76-a74b-452d-9dbb-d87677a44f43","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2024-09","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:14.907Z","lastSeenAt":"2026-04-22T13:32:03.080Z"}],"details":{"listingId":"55b68c76-a74b-452d-9dbb-d87677a44f43","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2024-09 \\\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 x402 challenge with maxAmountRequired of 20000 base units (USDC, 6 decimals = $0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/backups/2024-09"},{"claim":"The provider advertises $0.02 per request, no API keys, no rate limits, instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/backups/2024-09"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving archived backup data for September 2024 via a single paid request","Agent-driven data retrieval with no API key or account setup","Programmatic access to backup snapshots using x402 micropayments"],"bestFor":["Agents or scripts that need one-off access to backup data without account registration","Developers experimenting with x402 protocol payments on Base","Use cases where pay-per-request with no rate limits is preferred"],"notFor":["Users who need detailed documentation or schema before integrating","High-volume bulk data retrieval where per-request pricing adds up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.511Z"},"updatedAt":"2026-04-22T13:32:03.080Z"}}