{"id":"704e5825-e64d-445d-93b8-eeb8c54f2f25","shortId":"LXtaku","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 `/api/v1/trades/110` is listed as \"Premium API Access\" and accepts POST requests. Payment is handled via the x402 exact scheme — callers include an X-PAYMENT header with a signed payment of up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per request.\n\nThe 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 claims no API keys, no rate limits, and instant access — authentication and billing are handled entirely through the x402 payment challenge.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for what the `/api/v1/trades/110` endpoint actually returns. The endpoint is confirmed live (returns a proper 402 challenge), but without documentation it is unclear what trade data or functionality this specific route provides.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-request API","x402 trades endpoint","USDC API access","Base network API","low fee API","crypto payment API"],"warnings":["No documentation available — docs, API, pricing, and README pages all return only a wallet-connect prompt with no content.","The specific purpose and expected input/output of /api/v1/trades/110 is completely undocumented.","No OpenAPI schema or request/response examples are provided anywhere.","Cannot verify what data or functionality this endpoint actually delivers."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/110","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and all documentation pages are empty stubs. The purpose of the specific /api/v1/trades/110 route is 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'/request':17,34,162 '0.02':16,33,106,161 '000':100 '20':99 '402':237 '6':110 'Base network API' 'USDC API access' 'accept':74 'access':45,72,176 'actual':227 'advertis':116 'ai':10,27,128 'analysi':132 'analyt':122 'api':4,21,41,71,120,169,194 'authent':177 'base':7,24,61,101 'base-network' 'behind':51 'bill':179 'caller':85 'categori':118 'challeng':187,238 'claim':167 'classif':135 'confirm':232 'connect':203 'content':209 'convers':152 'crypto payment API' 'data':9,26,121,125,247 'decim':111 'detail':220 'doc':193 'document':188,221,241 'embed':136 'endpoint':14,31,50,65,155,226,230 'entir':182 'estim':146 'exact':83 'exampl':217 'exchang':141 'export':126 'extrem':190 'feed':140 'financ':11,28,137 'four':117 'function':249 'gas':145 'gate':3,20,44 'generat':153 'geocod':150 'given':107 'handl':79,181 'header':91 'i.e':105 'includ':86 'infrastructur':148 'insight':127 'instant':175 'json-response' 'key':170 'learn':130 'limit':173 'list':68,157 'live':233 'low fee API' 'lowpaymentfee.com':35 'machin':129 'marketplac':42 'metric':123 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':213 'page':198 'pay-per-request API' 'payment':77,90,95,186 'per':53,112 'per-request':52 'per-request-billing' 'platform':5,22,115,166 'point':164 'post':75 'post-endpoint' 'premium':70 'price':139,163,195 'prompt':205 'proper':236 'protocol':40 'provid':253 'quot':144 'rate':142,172 'readm':197 'report':124 'request':54,76,113 'request/response':216 'return':200,228,234 'rout':252 'schema':214 'scheme':84 'sentiment':131 'settl':56 'sign':94 'spars':191 'specif':64,251 'substant':208 'summar':134 'text':133 'token':143 'trade':246 'unclear':244 'unit':102 'usdc':58,104,108 'usdc-micropayment' 'util':13,30,149 'valid':151 'varieti':48 'via':80 'wallet':204 'web3':138 'without':240 'x':89 'x-payment':88 'x402':2,19,39,82,185 'x402 trades endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"e288f9c2-3b30-46d4-97f6-c587c2a1f96c","listingId":"704e5825-e64d-445d-93b8-eeb8c54f2f25","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/110","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:27.934Z"}],"sources":[{"listingId":"704e5825-e64d-445d-93b8-eeb8c54f2f25","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/110","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:27.934Z","lastSeenAt":"2026-04-26T09:33:34.532Z"}],"details":{"listingId":"704e5825-e64d-445d-93b8-eeb8c54f2f25","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/110 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/110"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/110"}],"useCases":["Fetching trade data or executing trade-related queries via a single paid API call","Integrating pay-per-use API access into autonomous agents without managing API keys","Programmatic access to premium data behind x402 micropayment gating"],"bestFor":["Developers building on Base who want frictionless per-call API billing","AI agents that can settle x402 payments autonomously","Users who prefer pay-as-you-go over subscription-based API access"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Developers not set up for USDC payments on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.756Z"},"updatedAt":"2026-04-26T09:33:34.532Z"}}