{"id":"cc3c7417-3062-418c-a43b-f5f6115b583a","shortId":"sJpWYp","kind":"x402","title":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-gated API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-request API endpoints gated by the x402 protocol, settling payments in USDC on the Base network. The specific endpoint `/api/v1/trades/5` is listed under \"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 call (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises four categories of endpoints: 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 are priced at $0.02 per request.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The specific functionality behind `/api/v1/trades/5` (the \"5\" path segment suggests a resource ID) is not documented, so it is unclear what trade data or action this endpoint provides. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","post-api","premium-api-access"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","trades API","lowpaymentfee","crypto payment API","402 payment required"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific purpose and expected input/output of /api/v1/trades/5 is unknown","No example requests or responses are available anywhere in the crawled material","The '5' in the path suggests a hardcoded resource ID but its meaning is undocumented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/5","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/5","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 x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of /api/v1/trades/5 is undocumented. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/trades/5':60,205 '/docs':170 '/pricing':171 '/readme':174 '/request':16,32 '0.02':15,31,88,162 '000':80 '0x8335':85 '20':79 '402':237 '402 payment required' '5':207 '6':93 'Base network API' 'USDC micropayment API' 'accept':68 'access':66 'action':225 'advertis':74,120 'ai':9,25,132 'analysi':136 'analyt':8,24,126 'api':4,20,42,65,96 'attach':105 'avail':200 'base':7,23,55,81 'base-network' 'behind':204 'broader':118 'call':90 'caller':103 'categori':122 'challeng':73,238 'classif':139 'collect':36 'confirm':232 'connect':180 'content':186 'convers':156 'cost':77 'crypto payment API' 'data':125,129,223 'decim':94 'document':165,195,216 'embed':140 'endpoint':13,29,43,59,124,227,230 'equal':87 'estim':150 'exampl':198 'exchang':145 'export':130 'extrem':167 'feed':144 'financ':10,26,141 'four':121 'function':203 'gas':149 'gate':3,19,44 'generat':157 'geocod':154 'header':110 'id':213 'infrastructur':152 'insight':131 'key':97 'learn':134 'limit':100 'list':62 'live':233 'lowpaymentfee' 'lowpaymentfee.com':33 'machin':133 'maximum':76 'metric':127 'network':56 'offer':34 'openapi':190 'page':175 'path':208 'pay':39 'pay-per-call API' 'pay-per-request':38 'payload':199 'payment':50,109,115 'per':40,89,163 'platform':119 'post':69 'post-api' 'premium':64 'premium-api-access' 'price':143,160 'prompt':182 'proof':116 'protocol':48 'provid':228 'quot':148 'rate':99,146 'render':177 'report':128 'request':41,70,164 'request/response':193 'requir':102 'resourc':212 'respons':239 'schema':194 'segment':209 'sentiment':135 'settl':49 'simpli':104 'spars':168 'spec':191 'specif':58,202 'suggest':210 'suit':5,21 'summar':138 'text':137 'token':147 'trade':222 'trades API' 'unclear':220 'unit':82 'usdc':52,84,91 'usdc-settlement' 'use':92 'util':12,28,153 'valid':113,155,236 'via':234 'wallet':181 'web3':142 'x':108 'x-payment':107 'x402':2,18,47,72,114 'x402 API' 'x402-gated':1,17 'x402-payment'","prices":[{"id":"cbae43d8-af70-4c71-96e2-efbfc14d4c40","listingId":"cc3c7417-3062-418c-a43b-f5f6115b583a","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/5","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:03.451Z"}],"sources":[{"listingId":"cc3c7417-3062-418c-a43b-f5f6115b583a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/5","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:03.451Z","lastSeenAt":"2026-04-26T02:03:12.220Z"}],"details":{"listingId":"cc3c7417-3062-418c-a43b-f5f6115b583a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/5 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/5"},{"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 (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching trade data or executing trade-related queries via a single paid API call","Integrating pay-per-request endpoints into agent workflows without API key management","Accessing premium data behind x402 payment gates on the Base L2 network"],"bestFor":["Developers or agents wanting keyless, pay-per-use API access","x402-compatible agent wallets on Base","Low-friction micropayment API consumption at $0.02/call"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integration","High-volume consumers who need bulk pricing or subscription plans","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.07Z"},"updatedAt":"2026-04-26T02:03:12.220Z"}}