{"id":"3ccbf411-0020-49fe-9976-e7892a94cb99","shortId":"McvsbG","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 access to a backup dataset labeled \"2023-05\" via the x402 payment protocol. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a variety of pay-per-request APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all gated behind x402 micropayments on the Base network using USDC.\n\nThe specific resource `/api/v1/backups/2023-05` is described simply as \"Premium API Access\" with no further documentation on the shape of the request body or the response payload. The x402 challenge confirms the endpoint is live, accepting POST requests, and requires a maximum payment of 20,000 base units of USDC (0x8335…on Base), which equals $0.02 USD (USDC uses 6 decimals). Payment is settled on-chain to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema, and no usage examples. The endpoint's actual functionality — what backup data it returns, what inputs it expects — is unknown from the available material. Prospective users should treat this as an opaque paid endpoint until better documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","backup-data","pay-per-request","no-api-key"],"categories":["storage","data"],"synonyms":["backup API","data backup endpoint","x402 backup","lowpaymentfee API","premium data access","paid backup download","Base USDC API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only 'Connect wallet' with no content","No request or response schema provided; the actual data returned by /api/v1/backups/2023-05 is unknown","The endpoint name suggests backup data from May 2023, but this is inferred from the URL path only","The platform lists many endpoints but none have documented schemas or usage guides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/2023-05","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/2023-05","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and network details, but there is zero documentation on what this endpoint actually does or returns. No OpenAPI spec, no request/response schema, no examples. The /docs and other pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api':170 '/api/v1/backups/2023-05':92 '/docs':169 '/pricing':171 '/readme':173 '0.02':10,24,143 '000':133 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x8335':138 '20':132 '2023':40 '300':160 '6':147 'Base USDC API' 'accept':123 'access':34,99 'actual':201 'address':156 'ai/ml':71 'analyt':70 'api':67,98 'avail':216 'backup':4,18,37,204 'backup API' 'backup-data' 'base':8,22,85,134,140 'base-network' 'behind':80 'better':229 'bodi':110 'chain':154 'challeng':117 'confirm':118 'connect':179 'content':185 'crawl':168 'data':5,19,69,74,205 'data backup endpoint' 'dataset':38 'decim':148 'describ':94 'document':103,163,230 'endpoint':6,20,30,52,120,199,227 'equal':142 'exampl':197 'expect':211 'extrem':165 'finance/web3':73 'function':202 'gate':3,17,79 'host':59 'infer':72 'infrastructur':76 'input':209 'label':39 'live':122 'lowpaymentfee API' 'lowpaymentfee.com':32,56 'mani':51 'materi':217 'maximum':129 'micropay':82 'network':86 'no-api-key' 'offer':53 'on-chain':152 'one':49 'opaqu':225 'openapi':189 'page':174 'paid':226 'paid backup download' 'pay':9,23,64 'pay-per-request':63 'payload':114 'payment':45,130,149 'per':11,25,65 'platform':57 'post':124 'premium':97 'premium data access' 'prompt':181 'prospect':218 'protocol':46 'provid':33 'request':12,26,66,109,125 'request/response':192 'requir':127 'resourc':91 'respons':113 'return':176,207 'schema':193 'second':161 'settl':151 'shape':106 'simpli':95 'span':68 'spars':166 'spec':190 'specif':90 'substant':184 'surfac':231 'timeout':162 'treat':221 'unit':135 'unknown':213 'usag':196 'usd':144 'usdc':14,28,88,137,145 'usdc-micropayment' 'use':87,146 'user':219 'util':77 'varieti':61 'via':42 'wallet':180 'x402':2,16,44,81,116 'x402 backup' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"74e61a65-78aa-434c-b396-824864d0440e","listingId":"3ccbf411-0020-49fe-9976-e7892a94cb99","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/2023-05","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:49.846Z"}],"sources":[{"listingId":"3ccbf411-0020-49fe-9976-e7892a94cb99","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/2023-05","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:49.846Z","lastSeenAt":"2026-04-22T16:32:25.955Z"}],"details":{"listingId":"3ccbf411-0020-49fe-9976-e7892a94cb99","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/2023-05 \\\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 endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-05"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/2023-05"}],"useCases":["Retrieving archived backup data from May 2023 via a single paid request","Agent-driven data retrieval where no API key provisioning is desired","Programmatic access to backup snapshots gated by micropayment"],"bestFor":["Agents or scripts that need keyless, pay-per-call access to backup data","Users comfortable with x402 on-chain payment flows on Base","Low-volume, on-demand data retrieval without subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed response schemas before integrating","High-volume batch retrieval where per-request micropayments become impractical","Anyone without a Base-compatible wallet or USDC balance"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.14Z"},"updatedAt":"2026-04-22T16:32:25.955Z"}}