{"id":"b648bd24-b144-44de-995c-b66d0be053d0","shortId":"aU63ad","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/6` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or subscriptions required.\n\nThe broader platform organizes its endpoints into 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 listed endpoints share the same $0.02 per-request pricing.\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 `/api/v1/trades/6` endpoint name suggests trade-related data, but no further specifics about the request body format or response structure are documented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-pricing","no-api-key","post-endpoint","pay-per-use"],"categories":["finance","data"],"synonyms":["trades API","micropayment API","x402 API","USDC pay-per-call","Base network API","low fee API","crypto trades endpoint"],"warnings":["No OpenAPI spec or schema documentation available","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no content","The specific purpose and expected request/response format of /api/v1/trades/6 is undocumented","Cannot verify what data or functionality this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is zero documentation on request/response schemas, no OpenAPI spec, no examples, and the docs pages are empty. The purpose of /api/v1/trades/6 is not explained beyond the generic label 'Premium API 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'/api/v1/trades/6':65,208 '/docs':175 '/pricing':177 '/readme':179 '/request':17,34 '0.02':16,33,93,165 '000':85 '0x8335':90 '20':84 '6':98 'Base network API' 'USDC pay-per-call' 'accept':73 'access':44,71 'advertis':79 'ai':10,27,133 'analysi':137 'analyt':127 'api':4,21,40,70,110 'avail':206 'base':7,24,60,86 'base-network' 'behind':50 'bodi':223 'broader':118 'categori':125 'challeng':78 'classif':140 'connect':185 'convers':157 'cost':82 'crypto trades endpoint' 'data':9,26,126,130,215 'decim':99 'detail':192 'document':170,201,229 'embed':141 'endpoint':14,31,49,64,122,161,209 'equal':92 'estim':151 'exact':106 'exampl':204 'exchang':146 'export':131 'extrem':172 'feed':145 'financ':11,28,142 'format':224 'four':124 'gas':150 'gate':3,20,43 'generat':158 'geocod':155 'infrastructur':153 'insight':132 'key':111 'learn':135 'limit':113 'list':67,160 'low fee API' 'lowpaymentfee.com':35 'machin':134 'made':102 'marketplac':41 'maximum':81 'metric':128 'micropay':54 'micropayment API' 'name':210 'network':61 'no-api-key' 'offer':8,25 'openapi':196 'organ':120 'page':180 'pay-per-use' 'payload':205 'payment':100 'per':52,94,167 'per-request':51,166 'per-request-pricing' 'platform':5,22,119 'post':74 'post-endpoint' 'premium':69 'price':144,169 'prompt':187 'protocol':39 'quot':149 'rate':112,147 'relat':214 'render':182 'report':129 'request':53,75,95,168,222 'request/response':199 'requir':116 'respons':226 'schema':200 'scheme':107 'sentiment':136 'settl':55 'share':162 'spars':173 'spec':197 'specif':63,219 'structur':227 'subscript':115 'suggest':211 'summar':139 'technic':191 'text':138 'token':148 'trade':213 'trade-rel':212 'trades API' 'unit':87 'usdc':57,89,96 'usdc-micropayment' 'use':97 'util':13,30,154 'valid':156 'varieti':47 'via':103 'wallet':186 'web3':143 'x402':2,19,38,77,105 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"f85cb26a-fe44-4fcb-90eb-316d8d200bdb","listingId":"b648bd24-b144-44de-995c-b66d0be053d0","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:04.052Z"}],"sources":[{"listingId":"b648bd24-b144-44de-995c-b66d0be053d0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:04.052Z","lastSeenAt":"2026-04-26T02:03:12.269Z"}],"details":{"listingId":"b648bd24-b144-44de-995c-b66d0be053d0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/6"},{"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":"Documentation pages render only a 'Connect wallet' prompt with no technical content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade-related data with per-request USDC micropayments on Base","Agent-driven API consumption without API key management","Programmatic access to premium data behind x402 payment gates"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where subscription pricing is wasteful"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.006Z"},"updatedAt":"2026-04-26T02:03:12.269Z"}}