{"id":"42af303f-cf08-495f-8268-b4523f6fba08","shortId":"56cDj5","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint at `/api/v1/payments/354` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform offers endpoints across four categories: 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 listed at the same $0.02 per request price point.\n\nHowever, documentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/354` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-platform","payments"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 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 specific endpoint /api/v1/payments/354 has no description beyond 'Premium API Access' — unclear what it returns","Cannot verify what data or service is actually delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/354","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/payments/354","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 accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no usable content. The purpose of the specific /api/v1/payments/354 route is undocumented. This is effectively a stub 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'/request':13,28 '0.02':12,27,76,154 '000':71 '20':70 '402':209 '402 payment api' 'accept':46 'access':62,91 'across':111 'actual':199 'advertis':82 'ai':121 'analysi':125 'analyt':115 'api':5,20,38,61,84,166 'attach':94 'base':8,23,51,72 'base network api' 'broader':107 'call':4,19,79 'caller':92 'categori':113 'challeng':210 'classif':128 'confirm':204 'connect':175 'convers':145 'data':114,118,218 'descript':193 'detail':182 'doc':165 'document':160,213 'embed':129 'endpoint':55,110,148,198,202 'estim':139 'exampl':190 'exchang':134 'export':119 'extrem':162 'feed':133 'financ':130 'four':112 'function':220 'gas':138 'generat':146 'geocod':143 'header':99 'howev':159 'http-post' 'infrastructur':141 'insight':120 'instant':90 'json-response' 'key':85 'label':59 'learn':123 'limit':88 'list':150 'live':205 'low payment fee' 'lowpaymentfee.com':31 'machin':122 'metric':116 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':109 'openapi':186 'page':170 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,66,98,104 'per':3,18,36,78,155 'platform':6,21,39,81,108 'point':158 'premium':60 'price':132,157,167 'prompt':177 'proof':105 'proper':208 'protocol':44 'provid':224 'quot':137 'rate':87,135 'readm':169 'render':172 'report':117 'request':37,156 'request/response':189 'requir':64 'return':200,206 'rout':223 'schema':187 'sentiment':124 'simpli':93 'specif':54,222 'summar':127 'technic':181 'text':126 'thin':163 'token':136 'unclear':216 'unit':73 'usd':77 'usdc':15,30,47,75 'usdc api' 'usdc-base-network' 'use':41 'util':142 'valid':102,144 'via':10,25 'wallet':176 'web3':131 'without':212 'x':97 'x-payment':96 'x402':11,26,43,103 'x402 api' 'x402-payment'","prices":[{"id":"1d3cf5b0-8734-4599-9a1e-7507f8bdb187","listingId":"42af303f-cf08-495f-8268-b4523f6fba08","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/payments/354","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:30.790Z"}],"sources":[{"listingId":"42af303f-cf08-495f-8268-b4523f6fba08","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/354","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:30.790Z","lastSeenAt":"2026-04-23T21:32:17.272Z"}],"details":{"listingId":"42af303f-cf08-495f-8268-b4523f6fba08","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/354 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Platform lists endpoints 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 confirms USDC asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base with maxAmountRequired of 20000 (= $0.02)","source_url":"https://lowpaymentfee.com/api/v1/payments/354"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to API services without subscription or API key management","Agent-driven workflows that need on-demand, per-call billing via crypto","Testing x402 payment protocol integrations on Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Projects that need to avoid API key provisioning overhead"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where per-request pricing may add up versus flat-rate plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.904Z"},"updatedAt":"2026-04-23T21:32:17.272Z"}}