{"id":"82c83b59-9fa4-4fab-93a9-8483451d0078","shortId":"MAeqHR","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","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 `/api/v1/payments/29` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. No API keys, rate limits, or subscriptions are required — each request is individually settled on-chain.\n\nThe broader platform advertises multiple API categories including 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/request price point.\n\nHowever, 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 schema, no request/response examples, and no description of what the `/api/v1/payments/29` endpoint specifically returns. The endpoint is live and responds with a valid x402 challenge, but the actual functionality behind this particular path is unclear from available material.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["infrastructure","api-gateway"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","crypto api gateway"],"warnings":["No documentation available — all doc pages render only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/payments/29 ('Premium API Access') is not explained anywhere","Cannot verify what data or service is actually returned after payment","The platform lists many API categories (AI, finance, data) but provides zero technical detail on any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/29","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/29","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, but there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/payments/29 is undescribed. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':13,32,155 '0.02':12,31,85,154 '000':80 '20':79 '402':74 'accept':54 'access':70 'actual':213 'advertis':109 'ai':121 'analysi':125 'analyt':115 'api':5,17,24,36,46,69,90,111,165 'avail':222 'base':8,27,59,81 'base network api' 'behind':215 'broader':107 'call':4,23,88 'categori':112 'chain':105 'challeng':75,210 'classif':128 'connect':174 'convers':145 'crypto api gateway' 'data':114,118 'descript':192 'detail':181 'doc':164 'document':159 'embed':129 'endpoint':63,148,197,201 'estim':139 'exampl':189 'exchang':134 'export':119 'extrem':161 'feed':133 'financ':130 'function':214 'gas':138 'generat':146 'geocod':143 'howev':158 'includ':113 'individu':101 'infrastructur':141 'insight':120 'json-response' 'key':18,37,91 'learn':123 'limit':93 'list':66,150 'live':203 'low payment fee' 'lowpaymentfee.com':39 'machin':122 'materi':223 'metric':116 'micropayment api' 'multipl':110 'network':9,28,60 'no-api-key' 'on-chain':103 'openapi':185 'page':169 'particular':217 'path':218 'pay':2,21,43 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':42 'payment':56 'per':3,22,44,87 'platform':6,25,47,108 'point':157 'premium':68 'price':132,156,166 'prompt':176 'protocol':52 'quot':137 'rate':92,135 'readm':168 'render':171 'report':117 'request':45,76,99 'request/response':188 'requir':19,38,97 'respond':205 'return':72,199 'schema':186 'sentiment':124 'settl':102 'spars':162 'specif':62,198 'subscript':95 'summar':127 'technic':180 'text':126 'token':136 'unclear':220 'unit':82 'usd':86 'usdc':15,34,55,84 'usdc api access' 'usdc-base-network' 'use':49 'util':142 'valid':144,208 'via':10,29 'wallet':175 'web3':131 'x402':11,30,51,209 'x402 api' 'x402-payment'","prices":[{"id":"c3b2d4bf-3889-41df-9874-618a9aa66a51","listingId":"82c83b59-9fa4-4fab-93a9-8483451d0078","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/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:21.689Z"}],"sources":[{"listingId":"82c83b59-9fa4-4fab-93a9-8483451d0078","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:21.689Z","lastSeenAt":"2026-04-23T12:31:28.411Z"}],"details":{"listingId":"82c83b59-9fa4-4fab-93a9-8483451d0078","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/29 \\\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 requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/29"},{"claim":"All endpoints 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":"The platform advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages all show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing pay-per-call API services without needing API keys or subscriptions","Making micropayments for individual API requests using USDC on Base","Agent-driven API consumption where each call is independently settled on-chain"],"bestFor":["Developers who want zero-commitment, pay-as-you-go API access","AI agents that need to autonomously purchase API calls via x402","Users who prefer on-chain USDC payments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.392Z"},"updatedAt":"2026-04-23T12:31:28.411Z"}}