{"id":"ef43b518-d59e-419b-ba36-9eb8660c216d","shortId":"LBenym","kind":"x402","title":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"x402-payable API platform on Base offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that exposes a broad set of endpoints across four categories: Data & Analytics (metrics, reports, 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no upfront commitments.\n\nThe specific endpoint at `/api/v1/trades/26` is described as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) on Base. It accepts HTTP POST and returns `application/json`. However, this particular path (`/trades/26`) does not appear in the site's publicly listed API catalog, so its exact functionality is unclear — it may be a trade-related data endpoint or a generic premium access route.\n\nDocumentation is extremely thin: 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 usage examples available from the crawled material. The endpoint is live and responds with a valid x402 challenge, but without documentation it is difficult to know what request body to send or what response to expect.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","trades API","lowpaymentfee"],"warnings":["The /api/v1/trades/26 endpoint is not listed in the site's public API catalog — its exact purpose is unknown.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available — request format must be guessed.","No example responses are available to verify what data this endpoint actually returns."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/26","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/26","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, but the specific /trades/26 path is not documented anywhere on the site. All documentation pages render only 'Connect wallet' with no content. No request/response schemas, no examples, and no OpenAPI spec are available. The listing is essentially a stub with confirmed 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'/request':17,34 '/trades/26':154 '0.02':16,33,90,140 '000':134 '20':133 '402':128 'Base network API' 'USDC API' 'accept':144 'access':124,185 'across':50 'ai':10,27,59 'analysi':63 'analyt':54 'api':4,21,41,105,123,164,194 'appear':157 'application/json':149 'avail':222 'base':7,24,98,135,142 'bodi':248 'broad':46 'catalog':165 'categori':52 'challeng':129,237 'classif':66 'commit':113 'connect':202 'content':208 'convers':83 'crawl':225 'data':9,26,53,179 'describ':120 'difficult':243 'doc':192 'document':187,217,240 'embed':67 'enabl':40 'endpoint':14,31,49,86,116,180,228 'estim':77 'exact':168 'exampl':221 'exchang':72 'expect':255 'export':57 'expos':44 'extrem':189 'feed':71 'financ':11,28,68 'four':51 'function':169 'gas':76 'generat':84 'generic':183 'geocod':81 'howev':150 'http':145 'http-post' 'i.e':139 'infrastructur':79 'insight':58 'json-api' 'key':106 'know':245 'learn':61 'limit':109 'list':163 'live':230 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':60 'marketplac':42 'materi':226 'may':173 'metric':55 'micropayment API' 'network':99 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':212 'page':197 'paid':93 'particular':152 'path':153 'pay-per-call API' 'pay-per-request' 'payabl':3,20 'per':91 'platform':5,22 'post':146 'premium':122,184 'price':70,88,193 'prompt':204 'protocol':103 'public':162 'quot':75 'rate':73,108 'readm':196 'relat':178 'render':199 'report':56 'request':92,130,247 'request/response':215 'respond':232 'respons':253 'return':126,148 'rout':186 'schema':216 'send':250 'sentiment':62 'set':47 'site':160 'spec':213 'specif':115 'summar':65 'text':64 'thin':190 'token':74 'trade':177 'trade-rel':176 'trades API' 'unclear':171 'unit':136 'upfront':112 'usag':220 'usdc':95,138 'usdc-base' 'util':13,30,80 'valid':82,235 'via':100 'wallet':203 'web3':69 'without':239 'x402':2,19,39,102,236 'x402 API' 'x402-enabled':38 'x402-payable':1,18 'x402-payment'","prices":[{"id":"ea4a00eb-e04f-4ce9-ac00-05c4cc7a91a5","listingId":"ef43b518-d59e-419b-ba36-9eb8660c216d","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/26","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:52.101Z"}],"sources":[{"listingId":"ef43b518-d59e-419b-ba36-9eb8660c216d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/26","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:52.101Z","lastSeenAt":"2026-04-26T04:03:40.914Z"}],"details":{"listingId":"ef43b518-d59e-419b-ba36-9eb8660c216d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/26 \\\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 site lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all priced at $0.02/request.","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The /api/v1/trades/26 endpoint returns a 402 challenge requesting up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/trades/26"}],"useCases":["Accessing trade-related data via a single paid API call","Integrating pay-per-request endpoints into agent workflows without API key management","Programmatic access to premium data behind x402 paywall"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Prototyping workflows that need low-cost, on-demand API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production use cases where $0.02/request adds up significantly","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.614Z"},"updatedAt":"2026-04-26T04:03:40.914Z"}}