{"id":"fb91d6a3-34a6-4fcc-a00a-372201e2c1e3","shortId":"P3atBV","kind":"x402","title":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402 protocol API marketplace that gates access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/backups/19` is listed as \"Premium API Access\" and accepts POST requests with an x402 payment challenge requiring up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals).\n\nThe broader platform advertises four categories of APIs: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text 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 with no API keys, no rate limits, and no minimum commitments required.\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 schema, no request/response examples, and no detailed documentation available from the crawl. The endpoint is confirmed live via a valid 402 challenge, but the actual functionality behind `/api/v1/backups/19` specifically (as opposed to the other listed endpoints) is unclear from the available material.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-method","json-response"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API marketplace","micropayment API","pay-per-request API","USDC API access","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition found for any endpoint","The specific endpoint /api/v1/backups/19 ('Premium API Access') does not match any of the publicly listed API categories; its actual functionality is unknown","No request body schema or response body examples available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/backups/19","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation beyond a wallet-connect prompt, no request/response examples, and the specific purpose of the `/api/v1/backups/19` endpoint is unexplained. This is effectively a stub 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'/request':17,34 '0.02':16,33,92,144 '000':86 '20':85 '402':205 '6':96 'Base network API' 'USDC API access' 'accept':74 'access':44,72 'actual':209 'advertis':101 'ai':10,27,113 'analysi':117 'analyt':107 'api':4,21,40,71,105,149,165 'avail':193,225 'base':7,24,60,87 'base-network' 'behind':50,211 'broader':99 'categori':103 'challeng':81,206 'classif':120 'commit':157 'confirm':200 'connect':174 'content':180 'convers':137 'crawl':196 'data':9,26,106,110 'decim':97 'detail':191 'doc':164 'document':159,192 'embed':121 'endpoint':14,31,49,64,140,198,220 'estim':131 'exampl':188 'exchang':126 'export':111 'extrem':161 'feed':125 'financ':11,28,122 'four':102 'function':210 'gas':130 'gate':3,20,43 'generat':138 'geocod':135 'given':93 'i.e':91 'infrastructur':133 'insight':112 'json-response' 'key':150 'learn':115 'limit':153 'list':68,219 'live':201 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':114 'marketplac':41 'materi':226 'metric':108 'micropay':54 'micropayment API' 'minimum':156 'network':61 'no-api-key' 'offer':8,25 'openapi':184 'oppos':215 'page':169 'pay-per-request API' 'payment':80 'per':52,145 'per-request':51 'per-request-billing' 'platform':5,22,100 'post':75 'post-method' 'premium':70 'price':124,142,166 'prompt':176 'protocol':39 'quot':129 'rate':127,152 'readm':168 'render':171 'report':109 'request':53,76,146 'request/response':187 'requir':82,158 'schema':185 'sentiment':116 'settl':55 'spars':162 'specif':63,213 'summar':119 'text':118 'token':128 'unclear':222 'unit':88 'usdc':57,90,94 'usdc-micropayment' 'util':13,30,134 'valid':136,204 'varieti':47 'via':202 'wallet':175 'web3':123 'x402':2,19,38,79 'x402 API marketplace' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"e7f42cd4-6026-4b46-92e2-88d02d3ff65e","listingId":"fb91d6a3-34a6-4fcc-a00a-372201e2c1e3","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:55.233Z"}],"sources":[{"listingId":"fb91d6a3-34a6-4fcc-a00a-372201e2c1e3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/backups/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:55.233Z","lastSeenAt":"2026-04-22T10:02:38.402Z"}],"details":{"listingId":"fb91d6a3-34a6-4fcc-a00a-372201e2c1e3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/backups/19 \\\n  -H \"Content-Type: application/json\"\n# Returns 402 with x402 payment challenge; attach X-PAYMENT header with signed USDC payment to access.","exampleRequest":null,"exampleResponse":{"error":"X-PAYMENT header is required","accepts":[{"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","extra":{"name":"USD Coin","version":"2"},"payTo":"0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","scheme":"exact","network":"base","mimeType":"application/json","resource":"https://lowpaymentfee.com/api/v1/backups/19","description":"Premium API Access","maxAmountRequired":"20000","maxTimeoutSeconds":300}],"x402Version":1},"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/backups/19"}],"useCases":["Paying per-request for data analytics, AI inference, or financial data without managing API keys or subscriptions","Integrating micropayment-gated API calls into autonomous agent workflows via x402","Accessing utility services like geocoding or data conversion with crypto-native billing"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agent-based systems that can handle x402 payment challenges natively","Users who prefer crypto-settled micropayments over traditional API billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:27.887Z"},"updatedAt":"2026-04-22T10:02:38.402Z"}}