{"id":"fa72e81f-4d1c-4a8d-a0a6-6c4f9ef7301c","shortId":"nt4J5B","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/159` 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/159` endpoint does not clearly map to any of these advertised categories, and no documentation, request/response schemas, or usage examples are available for it.\n\nThe crawled documentation, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content, so the actual behavior and response format of this endpoint remain unknown. Treat this listing as a stub until more documentation surfaces.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","json-response","post-method"],"categories":["finance","data"],"synonyms":["premium API","trades endpoint","x402 API","micropayment API","pay-per-call API","Base USDC API","lowpaymentfee"],"warnings":["No API documentation available — all doc/pricing/README pages return only a wallet connect prompt","The endpoint path /api/v1/trades/159 is not listed among the advertised API categories on the homepage","No request or response schema is provided; actual endpoint behavior is unknown","No OpenAPI spec, ai-plugin manifest, or agents.txt discovered"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/159","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the endpoint path '/api/v1/trades/159' doesn't match any advertised category. All doc pages returned only 'Connect wallet' with no 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'/request':17,34 '0.02':16,33,76,154 '000':80 '20':79 '6':86 'Base USDC API' 'access':71 'actual':207 'advertis':109,172 'ai':10,27,121 'analysi':125 'analyt':115 'api':4,21,41,70,97,189 'avail':183 'base':7,24,59,81 'behavior':208 'behind':49 'broader':107 'call':78 'categori':111,173 'classif':128 'clear':166 'connect':198 'content':204 'convers':145 'cost':73 'crawl':187 'data':9,26,114,118 'decim':87 'document':176,188,225 'embed':129 'endpoint':14,31,48,63,113,148,163,214 'estim':139 'exact':94 'exampl':181 'exchang':134 'export':119 'feed':133 'financ':11,28,130 'format':211 'four':110 'gas':138 'gate':3,20,44 'generat':146 'geocod':143 'handl':90 'howev':159 'infrastructur':141 'insight':120 'json-response' 'key':98 'learn':123 'limit':101 'list':67,150,219 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':122 'map':167 'marketplac':42 'metric':116 'micropay':53 'micropayment API' 'network':60 'offer':8,25 'page':193 'pay-per-call API' 'payment':88 'per':51,77,155 'per-request':50 'per-request-micropayment' 'platform':5,22,108 'point':158 'post-method' 'premium':69 'premium API' 'price':132,157,190 'prompt':200 'protocol':40 'quot':137 'rate':100,135 'readm':192 'remain':215 'report':117 'request':52,156 'request/response':177 'requir':105 'respons':210 'return':195 'schema':178 'scheme':95 'sentiment':124 'settl':54 'specif':62,161 'stub':222 'subscript':104 'substant':203 'summar':127 'surfac':226 'text':126 'token':136 'trades endpoint' 'treat':217 'unit':82 'unknown':216 'usag':180 'usdc':56,84 'usdc-base' 'util':13,30,142 'valid':144 'varieti':46 'via':91 'wallet':199 'web3':131 'x402':2,19,39,93 'x402 API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"5bda9745-8eab-49b3-afae-18a01554c431","listingId":"fa72e81f-4d1c-4a8d-a0a6-6c4f9ef7301c","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/159","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:41.389Z"}],"sources":[{"listingId":"fa72e81f-4d1c-4a8d-a0a6-6c4f9ef7301c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/159","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:41.389Z","lastSeenAt":"2026-04-26T07:03:05.598Z"}],"details":{"listingId":"fa72e81f-4d1c-4a8d-a0a6-6c4f9ef7301c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/159 \\\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 challenge with maxAmountRequired of 20000 in USDC (asset 0x8335…) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/159"},{"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 advertises Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data behind a per-request paywall","Agent-driven API consumption without API key management","Micropayment-gated data retrieval on Base network"],"bestFor":["Agents that need keyless, pay-per-call API access","Developers experimenting with x402 micropayment protocols","Use cases requiring low-friction, no-subscription API calls"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring a well-documented request/response schema before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.12Z"},"updatedAt":"2026-04-26T07:03:05.598Z"}}