{"id":"96a5e144-b5d4-45d7-8d84-95a4454e1df6","shortId":"mv7FHY","kind":"x402","title":"x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02 per request.","tagline":"x402-gated backup/data endpoint on Base, pay-per-call with USDC at $0.02 per request.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/backups/31` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all gated behind x402 micropayments settled in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The maximum amount required per call is 20,000 base units, which at 6 decimals equals $0.02 USD — consistent with the provider's advertised flat pricing of $0.02 per request across all endpoints. No API keys or rate limits are advertised; access is instant upon payment.\n\nDocumentation is extremely sparse. The `/docs`, `/api`, `/pricing`, and `/README` pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no description of what the `/api/v1/backups/31` endpoint specifically returns. The endpoint's purpose (\"backups\" resource #31) is unclear — it could be a data backup retrieval endpoint, but this is speculative. The response MIME type is `application/json`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","json-response","no-api-key","post-method"],"categories":["storage","data"],"synonyms":["backup API","x402 micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","data backup endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","No OpenAPI spec or request/response schema provided.","The purpose of '/api/v1/backups/31' is unclear — 'backups' resource with numeric ID is not explained anywhere.","No examples of request body or response body are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/31","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is zero documentation on what the /api/v1/backups/31 resource actually does, no request/response schemas, and no examples. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/backups/31':51,200 '/docs':167 '/pricing':169 '/readme':171 '0.02':15,32,132,143 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':109 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':113 '20':123 '31':210 '6':129 'Base network API' 'USDC pay-per-call' 'accept':98 'access':42,157 'across':146 'address':108 'advertis':139,156 'ai':69 'amount':118 'analyt':68 'api':41,150 'application/json':230 'backup':208,218 'backup API' 'backup/data':4,21 'base':7,24,87,115,125 'behind':79 'broad':64 'call':11,28,121 'catalog':65 'chain':106 'challeng':91 'confirm':92 'connect':177 'consist':134 'contract':112 'could':214 'data':67,217 'data backup endpoint' 'decim':130 'descript':196 'detail':184 'document':162,193 'endpoint':5,22,36,56,94,148,201,205,220 'equal':131 'extrem':164 'financ':72 'flat':140 'gate':3,20,78 'host':62 'infrastructur':75 'instant':159 'json-response' 'key':151 'learn':71 'limit':154 'live':96 'lowpaymentfee' 'lowpaymentfee.com':38 'machin':70 'mani':55 'maximum':117 'micropay':81 'mime':227 'network':88 'no-api-key' 'offer':57 'on-chain':104 'one':53 'openapi':188 'page':172 'pay':9,26 'pay-per-cal':8,25 'pay-per-call' 'payment':46,101,161 'per':10,16,27,33,120,144 'post':99 'post-method' 'premium':40 'premium API access' 'price':141 'prompt':179 'protocol':47 'provid':39,60,137 'purpos':207 'rate':153 'render':174 'request':17,34,100,145 'request/response':191 'requir':119 'resourc':50,209 'respons':226 'retriev':219 'return':203 'schema':192 'settl':82,103 'span':66 'spars':165 'spec':189 'specif':49,202 'specul':224 'technic':183 'type':228 'unclear':212 'unit':126 'upon':160 'usd':133 'usdc':13,30,84,111 'usdc-base' 'use':110 'util':76 'via':43 'wallet':178 'web3':73 'x402':2,19,45,80,90 'x402 micropayment API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"d61c2f81-aeef-4b78-9ea4-5fcc5661288a","listingId":"96a5e144-b5d4-45d7-8d84-95a4454e1df6","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/31","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:59:24.529Z"}],"sources":[{"listingId":"96a5e144-b5d4-45d7-8d84-95a4454e1df6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/31","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:59:24.529Z","lastSeenAt":"2026-04-22T10:32:34.238Z"}],"details":{"listingId":"96a5e144-b5d4-45d7-8d84-95a4454e1df6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/31 \\\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 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/31"},{"claim":"The provider advertises $0.02 per request flat pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/backups/31"}],"useCases":["Retrieving backup data via a single paid API call","Programmatic access to stored data without subscription or API key management","Agent-driven data retrieval with on-chain USDC micropayments"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who need one-off data retrieval without committing to a subscription"],"notFor":["Users who need detailed API documentation or request/response schemas before integrating","High-volume batch operations where $0.02 per request adds up significantly","Anyone who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.007Z"},"updatedAt":"2026-04-22T10:32:34.238Z"}}