{"id":"bd76bd78-3790-40bb-8aa9-538d891b9f6f","shortId":"5Vq74s","kind":"x402","title":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API suite on Base: analytics, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com offers a collection of pay-per-call API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint `/api/v1/trades/50` is listed as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The x402 challenge indicates a maxAmountRequired of 20,000 base units, which at 6 decimals for USDC equals $0.02 per request.\n\nThe broader platform advertises 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 (geocoding, validation, conversion, generation). All endpoints are listed 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 further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint, including `/api/v1/trades/50`. The exact functionality of the trades endpoint is unclear from available materials; the name suggests it may return trade or transaction data, but this is speculative.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","data-analytics","ai-inference","finance-data","crypto-data","geocoding","utility-apis"],"categories":["finance","llm","geo","data"],"synonyms":["low payment fee API","x402 API","pay-per-call API","Base network API","USDC micropayment API","trades API","crypto trades endpoint"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The exact functionality of /api/v1/trades/50 is unknown; 'Premium API Access' is the only description","No request or response examples available anywhere in crawled content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/50","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no documentation, no request/response examples, and the exact purpose of /api/v1/trades/50 is unclear. All secondary pages return only 'Connect wallet' with no useful 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'/request':16,32 '0.02':15,31,92,140 '000':82 '0x8335':70 '20':81 '2913':71 '6':87 'Base network API' 'USDC micropayment API' 'accept':65 'access':44,63 'across':100 'advertis':98 'ai':9,25,110 'ai-inference' 'analysi':114 'analyt':8,24,104 'api':4,20,42,62,145,161 'avail':204 'base':7,23,52,73,83 'broader':96 'call':41 'categori':102 'challeng':76 'classif':117 'collect':36 'commit':153 'connect':170 'content':176 'contract':69 'convers':133 'crypto trades endpoint' 'crypto-data' 'data':103,107,215 'data-analytics' 'decim':88 'detail':187 'doc':160 'document':155,188 'embed':118 'endpoint':13,29,43,56,99,136,191,200 'equal':91 'estim':128 'exact':195 'exampl':184 'exchang':123 'export':108 'extrem':157 'feed':122 'financ':10,26,119 'finance-data' 'four':101 'function':196 'gas':127 'generat':134 'geocod':131 'geocoding' 'includ':192 'indic':77 'infrastructur':130 'insight':109 'key':146 'learn':112 'limit':149 'list':59,138 'low payment fee API' 'lowpaymentfee.com':33 'machin':111 'materi':205 'maxamountrequir':79 'may':210 'metric':105 'minimum':152 'name':207 'network':53 'no-api-key' 'offer':34 'openapi':180 'page':165 'pay':39 'pay-per-cal':38 'pay-per-call API' 'pay-per-request' 'payabl':3,19 'payment':48,66 'per':40,93,141 'platform':97 'premium':61 'price':121,162 'prompt':172 'protocol':49 'quot':126 'rate':124,148 'readm':164 'render':167 'report':106 'request':94,142 'request/response':183 'requir':154 'return':211 'schema':181 'sentiment':113 'spars':158 'specif':55 'specul':219 'suggest':208 'suit':5,21 'summar':116 'text':115 'token':125 'trade':199,212 'trades API' 'transact':214 'unclear':202 'unit':84 'usdc':68,90 'usdc-base' 'util':12,28 'utility-apis' 'valid':132 'via':45 'wallet':171 'web3':120 'x402':2,18,47,75 'x402 API' 'x402-payable':1,17 'x402-payment'","prices":[{"id":"7a063493-2f9c-4e80-b628-86eb62c727f7","listingId":"bd76bd78-3790-40bb-8aa9-538d891b9f6f","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/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:58.046Z"}],"sources":[{"listingId":"bd76bd78-3790-40bb-8aa9-538d891b9f6f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:58.046Z","lastSeenAt":"2026-04-22T23:02:06.147Z"}],"details":{"listingId":"bd76bd78-3790-40bb-8aa9-538d891b9f6f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/50 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/50"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/50"},{"claim":"All 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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Fetching trade or market data on a per-request payment basis without subscription","Accessing AI inference endpoints (sentiment, summarization, classification) via x402","Retrieving financial data like price feeds, exchange rates, and gas estimates with micropayments","Running utility operations (geocoding, validation, conversion) paid per call in USDC"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","Agents or bots that can settle payments in USDC on Base via x402","Use cases requiring low-cost per-request pricing without API key management"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where $0.02/request adds up significantly","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.347Z"},"updatedAt":"2026-04-22T23:02:06.147Z"}}