{"id":"3d313e11-f6b3-4059-9f04-622e92f1859b","shortId":"W7BBYj","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/161` is listed as \"Premium API Access\" and costs up to $0.02 per call (maxAmountRequired of 20,000 base units of USDC, which has 6 decimals = $0.02). Payment is handled via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address, and the server fulfills the request upon verification.\n\nThe broader 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 $0.02 per request with no API keys, no rate limits, and no minimum commitments.\n\nHowever, the specific endpoint `/api/v1/trades/161` does not clearly map to any of the documented categories on the landing page. The \"trades\" path suggests a finance or trading-related resource, but no further documentation, request schema, or response schema is available. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. Without request/response schemas or documentation, callers must experiment to determine what this endpoint accepts and returns.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","micropayment API","pay-per-call API","Base USDC API","lowpaymentfee","trades API","premium API access"],"warnings":["No request or response schema available — callers cannot know what to send or what to expect","The /api/v1/trades/161 path does not appear in the site's documented API catalog","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no content","The purpose of this specific endpoint (trades/161) is unclear — 'Premium API Access' is a generic label"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/161","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge), and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no request/response schema, no examples, and the /trades/161 path is not explained anywhere on the site. The docs pages are empty beyond a wallet-connect prompt. This is effectively a stub 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'/request':17,34 '0.02':16,33,78,93,171 '000':84 '20':83 '6':91 'Base USDC API' 'accept':257 'access':45,73 'address':116 'advertis':128 'ai':10,27,140 'analysi':144 'analyt':134 'api':4,21,41,72,132,176,228 'attach':103 'avail':225 'base':7,24,61,85 'behind':51 'broader':126 'call':80 'caller':102,249 'categori':130,199 'classif':147 'clear':192 'commit':184 'connect':237 'content':243 'convers':164 'cost':75 'data':9,26,133,137 'decim':92 'determin':253 'doc':227 'document':198,218,248 'embed':148 'endpoint':14,31,50,65,167,188,256 'estim':158 'exact':100 'exchang':153 'experi':251 'export':138 'feed':152 'financ':11,28,149,209 'four':129 'fulfil':120 'gas':157 'gate':3,20,44 'generat':165 'geocod':162 'handl':96 'header':108 'howev':185 'infrastructur':160 'insight':139 'json-response' 'key':177 'land':202 'learn':142 'limit':180 'list':69,169 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':141 'map':193 'marketplac':42 'maxamountrequir':81 'metric':135 'micropay':55 'micropayment API' 'minimum':183 'must':250 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'page':203,232 'path':206 'pay-per-call API' 'payment':94,107,112 'payto':115 'per':53,79,172 'per-request':52 'per-request-micropayment' 'platform':5,22,127 'post-method' 'premium':71 'premium API access' 'price':151,229 'prompt':239 'protocol':40 'quot':156 'rate':154,179 'readm':231 'relat':213 'report':136 'request':54,122,173,219 'request/response':245 'resourc':214 'respons':222 'return':234,259 'schema':220,223,246 'scheme':101 'sentiment':143 'server':119 'settl':56 'sign':111 'specif':64,187 'substant':242 'suggest':207 'summar':146 'text':145 'token':155 'trade':205,212 'trades API' 'trading-rel':211 'unit':86 'upon':123 'usdc':58,88 'usdc-base' 'util':13,30,161 'valid':163 'varieti':48 'verif':124 'via':97 'wallet':238 'web3':150 'without':244 'x':106 'x-payment':105 'x402':2,19,39,99 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"f56822b2-fd7b-4717-9ef0-bdcaffdd3b98","listingId":"3d313e11-f6b3-4059-9f04-622e92f1859b","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/161","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:35.843Z"}],"sources":[{"listingId":"3d313e11-f6b3-4059-9f04-622e92f1859b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/161","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:35.843Z","lastSeenAt":"2026-04-26T08:32:38.659Z"}],"details":{"listingId":"3d313e11-f6b3-4059-9f04-622e92f1859b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/161 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/161"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/161"},{"claim":"All endpoints listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data or executing trade operations via a single paid API call","Integrating pay-per-request endpoints into autonomous agent workflows without API key management","Programmatic access to financial or trading resources settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-call API access on Base","AI agents that can settle x402 micropayments autonomously","Users who prefer no-commitment, usage-based pricing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who need bulk pricing or subscription plans","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.399Z"},"updatedAt":"2026-04-26T08:32:38.659Z"}}