{"id":"d7baa699-88bc-4d04-8300-dfb9c398e912","shortId":"fLw9Gk","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/trades/152` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum amount of 20,000 base units of USDC (0x8335…2913 on Base), which at 6 decimals equals $0.02 per request.\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 uniformly 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 substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The specific functionality behind `/api/v1/trades/152` is unclear from available materials; the name \"Premium API Access\" is generic and does not describe what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-request API","Base USDC API","trades endpoint"],"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 purpose of /api/v1/trades/152 ('Premium API Access') is undefined and generic","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/152","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/trades/152","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 purpose of /api/v1/trades/152 is entirely unclear. The docs pages are empty beyond a wallet-connect 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'/request':17,34 '0.02':16,33,101,151 '000':87 '0x8335':92 '20':86 '2913':93 '6':98 'Base USDC API' 'accept':75 'access':45,73,217 'across':109 'advertis':81 'ai':10,27,119 'amount':84 'analysi':123 'analyt':113 'api':4,21,41,72,156,172,216 'avail':211 'base':7,24,61,88,95 'behind':51,206 'broader':105 'categori':111 'challeng':80 'classif':126 'commit':164 'connect':181 'content':187 'convers':143 'data':9,26,112,116,225 'decim':99 'describ':223 'detail':198 'doc':171 'document':166,199 'embed':127 'endpoint':14,31,50,65,108,146,202 'equal':100 'estim':137 'exampl':195 'exchang':132 'export':117 'extrem':168 'feed':131 'financ':11,28,128 'four':110 'function':205 'gas':136 'gate':3,20,44 'generat':144 'generic':219 'geocod':141 'infrastructur':139 'insight':118 'json-response' 'key':157 'learn':121 'limit':160 'list':69 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':120 'marketplac':42 'materi':212 'maximum':83 'metric':114 'micropay':55 'micropayment API' 'minimum':163 'name':214 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25,107 'openapi':191 'page':176 'pay-per-request API' 'per':53,102,152 'per-request':52 'per-request-micropayment' 'platform':5,22,106 'post':76 'post-endpoint' 'premium':71,215 'price':130,149,173 'prompt':183 'protocol':40 'quot':135 'rate':133,159 'readm':175 'render':178 'report':115 'request':54,77,103,153 'request/response':194 'requir':165 'return':229 'schema':192 'sentiment':122 'servic':227 'settl':56 'spars':169 'specif':64,204 'substant':186 'summar':125 'text':124 'token':134 'trades endpoint' 'unclear':209 'uniform':148 'unit':89 'usdc':58,91 'usdc-base' 'util':13,30,140 'valid':142 'varieti':48 'wallet':182 'web3':129 'x402':2,19,39,79 'x402 trades API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"9c2ef739-34eb-43eb-9b9c-ec6f8b2a2da3","listingId":"d7baa699-88bc-4d04-8300-dfb9c398e912","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/trades/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:45.028Z"}],"sources":[{"listingId":"d7baa699-88bc-4d04-8300-dfb9c398e912","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/152","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:45.028Z","lastSeenAt":"2026-04-26T05:32:45.816Z"}],"details":{"listingId":"d7baa699-88bc-4d04-8300-dfb9c398e912","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/152 \\\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":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/152"},{"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 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 a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade-related data or services via a single micropayment without needing an API key","Programmatic pay-per-call access to premium data from AI agents on Base","Integrating low-friction paid API calls into automated workflows"],"bestFor":["Developers wanting zero-signup, pay-per-request API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer no rate limits and no subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone requiring non-crypto payment methods","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.958Z"},"updatedAt":"2026-04-26T05:32:45.816Z"}}