{"id":"be254ec5-d6a5-4b58-85cb-49091d86418b","shortId":"bGhZm7","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/43` 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). No API keys or rate limits are required — callers simply attach an x402 payment header to each request.\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 listed at the same $0.02/request price point. However, the specific `/api/v1/trades/43` endpoint does not clearly map to any of these advertised categories, and no documentation beyond the landing page was available — the docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI schema, no request/response examples, and no documentation describing what this particular endpoint actually returns, the exact functionality of `/api/v1/trades/43` remains unclear. The endpoint is live (returns a valid 402 challenge), but callers should be aware that the input format and output structure are undocumented.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["data","finance"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-request API","USDC API","Base network API"],"warnings":["No documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no content.","The endpoint path '/api/v1/trades/43' does not match any of the advertised API categories on the landing page; its actual functionality is unknown.","No OpenAPI schema or output schema describing request parameters or response format.","No examples of successful responses are available."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/43","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/43","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 challenge with clear pricing, but there is zero documentation on what /api/v1/trades/43 actually does, no request/response schema, and no examples. The docs/pricing/README pages are all empty beyond a wallet-connect 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'/request':17,34,168 '0.02':16,33,95,167 '000':87 '0x8335':92 '20':86 '402':246 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73 'actual':230 'advertis':81,123,184 'ai':10,27,135 'analysi':139 'analyt':129 'api':4,21,41,72,103,197 'attach':112 'avail':194 'awar':252 'base':7,24,61,88 'base-network' 'behind':51 'beyond':189 'broader':121 'caller':110,249 'categori':125,185 'challeng':80,247 'classif':142 'clear':178 'connect':206 'content':212 'convers':159 'cost':84 'data':9,26,128,132 'decim':101 'describ':225 'doc':196 'document':188,224 'embed':143 'endpoint':14,31,50,65,127,175,229,240 'equal':94 'estim':153 'exact':233 'exampl':221 'exchang':148 'export':133 'feed':147 'financ':11,28,144 'format':256 'four':124 'function':234 'gas':152 'gate':3,20,44 'generat':160 'geocod':157 'header':116 'howev':171 'infrastructur':155 'input':255 'insight':134 'json-response' 'key':104 'land':191 'learn':137 'limit':107 'list':69,163 'live':242 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':136 'map':179 'marketplac':42 'maximum':83 'metric':130 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':217 'output':258 'page':192,201 'particular':228 'pay-per-request API' 'payment':115 'per':53,96 'per-request':52 'per-request-billing' 'platform':5,22,122 'point':170 'post':76 'post-endpoint' 'premium':71 'price':146,169,198 'prompt':208 'protocol':40 'quot':151 'rate':106,149 'readm':200 'remain':237 'report':131 'request':54,77,97,119 'request/response':220 'requir':109 'return':203,231,243 'schema':218 'sentiment':138 'settl':56 'simpli':111 'specif':64,173 'structur':259 'substant':211 'summar':141 'text':140 'token':150 'unclear':238 'undocu':261 'unit':89 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30,156 'valid':158,245 'varieti':48 'wallet':207 'web3':145 'x402':2,19,39,79,114 'x402 trades API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"1d3f8719-28f6-4f4c-9559-68c26224cf64","listingId":"be254ec5-d6a5-4b58-85cb-49091d86418b","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/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:55.660Z"}],"sources":[{"listingId":"be254ec5-d6a5-4b58-85cb-49091d86418b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:55.660Z","lastSeenAt":"2026-04-26T03:03:00.030Z"}],"details":{"listingId":"be254ec5-d6a5-4b58-85cb-49091d86418b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/43 \\\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 x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/43"},{"claim":"All listed 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, pricing, API, and README pages return only a 'Connect wallet' prompt with no substantive documentation","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade data or premium content behind a per-call micropayment wall","Integrating pay-per-use API calls into autonomous agent workflows without API key management","Testing x402 protocol payment flows on Base with low-cost endpoints"],"bestFor":["Developers experimenting with x402 micropayment protocols","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer per-request pricing over subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Anyone requiring non-USDC or non-Base-network payment settlement"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.465Z"},"updatedAt":"2026-04-26T03:03:00.030Z"}}