{"id":"60ba5072-23b9-41f4-b596-8c5a0f555dd6","shortId":"VyCGgY","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 USDC micropayments on the Base network. The specific endpoint `/api/v1/products/63` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is made via the x402 exact scheme — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\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 listed at the same $0.02/request price point. The platform settles payments to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC (contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.\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 example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what request body the POST expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","pay-per-use"],"categories":["api-marketplace","data","llm","finance","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","low payment fee API"],"warnings":["No API documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet' with no technical content","No OpenAPI or JSON schema describing request or response formats for this endpoint","The endpoint name 'Premium API Access' is generic and does not describe what data or functionality it provides","Cannot verify what the endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/63","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/63","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 402 challenge and clear pricing ($0.02 USDC on Base). However, documentation is effectively nonexistent — no OpenAPI spec, no request/response schemas, no examples, and all doc pages show only 'Connect wallet'. The specific purpose of /api/v1/products/63 ('Premium API Access') is vague and undifferentiated from the platform's other 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'/api/v1/products/63':64 '/docs':187 '/pricing':189 '/readme':191 '/request':17,34,166 '0.02':16,33,75,165 '000':79 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':175 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':179 '20':78 '402':227 '6':85 'Base network API' 'USDC API access' 'access':45,70 'account':98 'address':174 'advertis':120 'ai':10,27,132 'analysi':136 'analyt':126 'api':4,21,41,69,96,124 'attach':106 'avail':218 'base':7,24,59,80,181 'base-network' 'behind':51 'bodi':237 'broader':118 'call':77 'caller':104 'categori':122 'challeng':228 'classif':139 'confirm':222 'connect':197 'contract':178 'convers':156 'cost':72 'data':9,26,125,129 'decim':86 'detail':204 'document':182,213,231 'embed':140 'endpoint':14,31,50,63,159,220 'estim':150 'exact':93 'exampl':216 'exchang':145 'expect':240 'export':130 'extrem':184 'feed':144 'financ':11,28,141 'four':121 'gas':149 'gate':3,20,44 'generat':157 'geocod':154 'header':111 'infrastructur':152 'insight':131 'key':97 'learn':134 'limit':101 'list':66,161 'live':223 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':133 'made':89 'marketplac':42 'metric':127 'micropay':56 'micropayment API' 'network':60 'no-api-key' 'offer':8,25 'openapi':208 'page':192 'pay-per-call API' 'pay-per-use' 'payload':217,244 'payment':87,110,115,172 'per':53,76 'per-request':52 'per-request-billing' 'platform':5,22,119,170 'point':168 'post':239 'premium':68 'price':143,167 'prompt':199 'proof':116 'proper':226 'protocol':40 'quot':148 'rate':100,146 'render':194 'report':128 'request':54,236 'request/response':211 'requir':103 'respons':243 'return':224,246 'schema':212 'scheme':94 'sentiment':135 'settl':171 'simpli':105 'spars':185 'spec':209 'specif':62 'summar':138 'technic':203 'text':137 'token':147 'unclear':234 'unit':81 'usdc':55,83,177 'usdc-micropayment' 'use':176 'util':13,30,153 'valid':114,155 'varieti':48 'via':90 'wallet':198 'web3':142 'without':230 'x':109 'x-payment':108 'x402':2,19,39,92 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"74ed41d8-3d01-49aa-abaa-cd9ceff79714","listingId":"60ba5072-23b9-41f4-b596-8c5a0f555dd6","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:56.320Z"}],"sources":[{"listingId":"60ba5072-23b9-41f4-b596-8c5a0f555dd6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:56.320Z","lastSeenAt":"2026-04-23T19:30:51.701Z"}],"details":{"listingId":"60ba5072-23b9-41f4-b596-8c5a0f555dd6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/63 \\\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":"The 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":"The x402 challenge specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/63"},{"claim":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/products/63"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off API calls with instant USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access"],"bestFor":["Developers or agents wanting frictionless, keyless API access via crypto micropayments","Low-volume or sporadic API consumers who prefer per-call pricing over subscriptions","x402-compatible AI agents that can autonomously pay for API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:52.245Z"},"updatedAt":"2026-04-23T19:30:51.701Z"}}