{"id":"e9d7ff30-57aa-4529-a61c-d3ebaa3b0f95","shortId":"Zv5SvG","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated backup/data endpoint on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides access to a backup resource (`/api/v1/backups/2024-01`) behind an x402 paywall. The provider operates a broad catalog of pay-per-request 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), settled on-chain with no API keys, rate limits, or upfront commitments.\n\nThe specific endpoint probed (`/api/v1/backups/2024-01`) is described by the provider simply as \"Premium API Access\" and returns `application/json`. The x402 challenge confirms it is live, accepting POST requests, with a max amount of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02). The payment is sent to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no explanation of what the backup endpoint actually returns. The provider's landing page lists many other endpoints but provides no detail beyond names and prices. Without documentation or example responses, the actual utility of this endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","json-response","backup-data","no-api-key"],"categories":["storage","data"],"synonyms":["x402 backup API","pay-per-call data endpoint","USDC gated API","Base network API","lowpaymentfee","premium API access","on-chain payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The purpose and contents of '/api/v1/backups/2024-01' are completely undocumented","No example responses available; actual utility is unknown"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2024-01","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/2024-01","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on what the endpoint actually returns, no OpenAPI spec, no example requests or responses, and all doc pages render only 'Connect wallet'. The purpose of the /backups/2024-01 resource is 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'0.02':9,26,85,148 '000':137 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':154 '0x8335':142 '20':136 '2913':143 '300':157 '6':146 'Base network API' 'USDC gated API' 'accept':128 'access':40,117 'actual':199,224 'ai/ml':65 'amount':134 'analyt':64 'api':15,32,61,96,116,166 'application/json':120 'backup':43,197 'backup-data' 'backup/data':4,21 'base':7,24,80,138,145 'behind':46 'beyond':214 'broad':54 'catalog':55 'chain':93 'challeng':123 'coin':89 'commit':102 'confirm':124 'connect':175 'content':181 'cost':84 'data':63,68 'decim':147 'describ':109 'detail':213 'doc':165 'document':160,190,219 'endpoint':5,22,36,105,198,209,228 'exampl':221 'explan':193 'extrem':162 'finance/web3':67 'gate':3,20,73 'infer':66 'infrastructur':70 'json-response' 'key':16,33,97 'land':204 'limit':99 'list':206 'live':127 'lowpaymentfee' 'lowpaymentfee.com':38 'mani':207 'max':133 'name':215 'network':81 'no-api-key' 'on-chain':91 'on-chain payment API' 'openapi':185 'oper':52 'page':170,205 'pay':8,25,58 'pay-per-call data endpoint' 'pay-per-request':57 'payment':150 'paywal':49 'per':10,27,59 'post':129 'premium':115 'premium API access' 'price':167,217 'probe':106 'prompt':177 'protocol':77 'provid':39,51,112,202,211 'rate':98 'readm':169 'render':172 'request':11,28,60,83,130 'request/response':188 'requir':17,34 'resourc':44 'respons':222 'return':119,200 'schema':189 'second':158 'sent':152 'settl':90 'simpli':113 'span':62 'spars':163 'spec':186 'specif':104 'timeout':159 'unclear':230 'unit':139 'upfront':101 'usd':88 'usdc':13,30,87,141 'usdc-on-base' 'util':71,225 'via':74 'wallet':176 'without':218 'x402':2,19,48,76,122 'x402 backup API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"5efcba18-2b1e-4c98-bd76-83f8a489077c","listingId":"e9d7ff30-57aa-4529-a61c-d3ebaa3b0f95","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/2024-01","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:46.343Z"}],"sources":[{"listingId":"e9d7ff30-57aa-4529-a61c-d3ebaa3b0f95","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2024-01","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:46.343Z","lastSeenAt":"2026-04-22T18:32:49.054Z"}],"details":{"listingId":"e9d7ff30-57aa-4529-a61c-d3ebaa3b0f95","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2024-01 \\\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":"Endpoint returns 402 with x402 challenge, confirming it is live on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2024-01"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals, so 20000 base units = $0.02","source_url":"https://lowpaymentfee.com/api/v1/backups/2024-01"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving backup data for January 2024 via a single paid request","Agent-driven data retrieval without pre-registration or API keys","Programmatic access to archived or snapshot data behind a micropayment wall"],"bestFor":["Agents or scripts that need one-off data retrieval without account setup","Developers exploring x402 payment flows on Base","Use cases where pay-per-request is preferable to subscriptions"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch retrieval where per-request pricing adds up quickly","Anyone needing to understand the response schema before paying"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.343Z"},"updatedAt":"2026-04-22T18:32:49.054Z"}}