{"id":"97a28264-ad76-492b-8a96-e8701e263e90","shortId":"nZfK4W","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 a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/59` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required.\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 endpoints are listed at the same $0.02 per request price point. However, the specific `/api/v1/trades/59` endpoint does not clearly map to any of these documented categories, and no schema or documentation describes its request/response format.\n\nThe endpoint is live and returns a proper 402 challenge. Documentation beyond the landing page is extremely thin — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response examples, and no detailed documentation available for this or any other endpoint on the platform.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-api","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content.","The endpoint path /api/v1/trades/59 does not appear in the site's listed API catalog; its purpose is unclear.","No request or response schema is documented; callers cannot know what to send or expect back.","No OpenAPI specification or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/59","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid 402 challenge, but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific endpoint path (/api/v1/trades/59) is not described anywhere on the site. Effectively a stub 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'/request':17,34 '0.02':16,33,76,154 '000':80 '20':79 '402':191 '6':86 'Base network API' 'USDC API' 'access':71 'addit':217 'advertis':109 'ai':10,27,121 'analysi':125 'analyt':115 'api':4,21,41,70,97,203 'avail':231 'base':7,24,59,81 'behind':49 'beyond':194 'broader':107 'call':78 'categori':111,173 'challeng':192 'classif':128 'clear':166 'connect':212 'content':218 'convers':145 'cost':73 'data':9,26,114,118 'decim':87 'describ':179 'detail':229 'doc':202 'document':172,178,193,230 'embed':129 'endpoint':14,31,48,63,113,148,163,184,237 'estim':139 'exact':94 'exampl':226 'exchang':134 'export':119 'extrem':199 'feed':133 'financ':11,28,130 'format':182 'four':110 'gas':138 'gate':3,20,44 'generat':146 'geocod':143 'handl':90 'howev':159 'infrastructur':141 'insight':120 'json-api' 'key':98 'land':196 'learn':123 'limit':101 'list':67,150 'live':186 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'map':167 'marketplac':42 'metric':116 'micropay':53 'micropayment API' 'network':60 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':222 'page':197,207 'pay-per-call API' 'payment':88 'per':51,77,155 'per-request':50 'per-request-micropayment' 'platform':5,22,108,240 'point':158 'premium':69 'price':132,157,204 'prompt':214 'proper':190 'protocol':40 'quot':137 'rate':100,135 'readm':206 'render':209 'report':117 'request':52,156 'request/response':181,225 'requir':105 'return':188 'schema':176 'scheme':95 'sentiment':124 'settl':54 'spec':223 'specif':62,161 'subscript':104 'summar':127 'text':126 'thin':200 'token':136 'unit':82 'usdc':56,84 'usdc-base' 'util':13,30,142 'valid':144 'varieti':46 'via':91 'wallet':213 'web3':131 'x402':2,19,39,93 'x402 trades API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"97f7a921-5023-4a46-b4dd-4e8791ff3bc4","listingId":"97a28264-ad76-492b-8a96-e8701e263e90","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/59","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:00.403Z"}],"sources":[{"listingId":"97a28264-ad76-492b-8a96-e8701e263e90","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/59","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:00.403Z","lastSeenAt":"2026-04-26T02:03:12.075Z"}],"details":{"listingId":"97a28264-ad76-492b-8a96-e8701e263e90","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/59 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/59"},{"claim":"All listed endpoints cost $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 & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data via a single micropayment without needing an API key","Programmatic agents making one-off paid API calls settled on Base L2","Exploring x402-protocol pay-per-request patterns for data retrieval"],"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 billing over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume production workloads requiring SLAs and support","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.231Z"},"updatedAt":"2026-04-26T02:03:12.075Z"}}