{"id":"91b1d3f5-2f01-4bf2-9e30-cea006f9b397","shortId":"v3adf9","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are pay-per-request at $0.02 each, settled in USDC on the Base network. No API keys, accounts, or rate limits are required — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/products/59` is listed as \"Premium API Access\" and returns `application/json` via POST. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. However, documentation 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 examples available. The exact functionality behind the \"Premium API Access\" label at `/api/v1/products/59` is unclear and cannot be determined from the available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base network api","usdc api access","402 payment api"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for any endpoint","The exact functionality of /api/v1/products/59 ('Premium API Access') is unknown — the name is generic and undocumented","No request body schema or response schema available; integration requires trial and error"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/59","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/products/59","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 402 challenge, confirming it works. However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of '/api/v1/products/59' (\"Premium API Access\") is entirely opaque. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/call':13,28 '0.02':12,27,62,125,172 '000':114 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':113 '300':140 '402 payment api' '6':129 'access':100,219 'account':74 'across':45 'address':136 'advertis':109,146 'ai/ml':48 'analysi':150 'analyt':47 'api':5,20,37,72,99,182,218 'application/json':103 'asset':119 'attach':82 'avail':211,231 'base':8,23,69,115,122 'base network api' 'behind':215 'broader':144 'caller':80 'cannot':226 'challeng':108 'classif':153 'connect':191 'convers':165 'data':46 'decim':130 'detail':198 'determin':228 'doc':181 'document':176,207 'embed':154 'enabl':36 'endpoint':44,55,92,147 'equal':124 'estim':162 'exact':213 'exampl':210 'exchang':157 'extrem':178 'feed':156 'finance/web3':50 'function':214 'gas':161 'generat':167 'geocod':163 'given':126 'header':86 'howev':175 'infer':49 'infrastructur':52 'json-response' 'key':73 'label':220 'limit':77 'list':96 'low payment fee' 'lowpaymentfee.com':31 'marketplac':38 'materi':232 'maxamountrequir':111 'micropayment api' 'network':9,24,70 'no-api-key' 'offer':40 'openapi':202 'page':186 'pay':2,17,58 'pay per call api' 'pay-per-request':1,16,57 'payment':85,132 'per':3,18,59 'platform':6,21,145 'point':174 'post':105 'post-method' 'premium':98,217 'price':155,173,183 'prompt':193 'quot':160 'rate':76,158 'readm':185 'render':188 'request':4,19,60,89 'request/response':205 'requir':79 'return':102 'schema':206 'second':141 'sent':134 'sentiment':149 'settl':64 'simpli':81 'spars':179 'spec':203 'specif':91 'summar':152 'technic':197 'text':151 'timeout':142 'token':159 'unclear':224 'unit':116 'usdc':15,30,66,118,127 'usdc api access' 'usdc-base-network' 'util':53 'valid':164 'varieti':42 'via':10,25,104 'wallet':192 'x402':11,26,35,84,107 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"a188fa16-b41d-45e1-9e2c-58c6f1616b38","listingId":"91b1d3f5-2f01-4bf2-9e30-cea006f9b397","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/products/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:07.868Z"}],"sources":[{"listingId":"91b1d3f5-2f01-4bf2-9e30-cea006f9b397","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:07.868Z","lastSeenAt":"2026-04-23T19:00:37.377Z"}],"details":{"listingId":"91b1d3f5-2f01-4bf2-9e30-cea006f9b397","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/59 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/59"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","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":["Accessing pay-per-request API services without needing API keys or subscriptions","Making micropayment-gated API calls settled in USDC on Base","Integrating x402-compatible endpoints into agent workflows"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Anyone without a Base-network USDC wallet","High-volume use cases where per-request pricing may not be cost-effective compared to subscription APIs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.668Z"},"updatedAt":"2026-04-23T19:00:37.377Z"}}