{"id":"6f59a6bb-c99a-4f19-bf86-45b9f8219efd","shortId":"ZF7J63","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 platform 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/145` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme with no API keys, rate limits, or 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.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint, including the `/api/v1/trades/145` endpoint being listed here. The specific purpose of the \"trades/145\" endpoint is unclear from available materials; it does not appear in the homepage's listed API catalog, making it difficult to determine what data or functionality it provides.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["premium API access","trades API","x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","The /api/v1/trades/145 endpoint does not appear in the homepage's listed API catalog; its specific functionality is unknown","No OpenAPI schema or request/response examples are provided","No robots.txt or agents.txt found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/145","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/145","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 x402 402 challenge, confirming it accepts payments. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The specific trades/145 endpoint is not listed on the homepage catalog, making its purpose unclear. Effectively a stub 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'/request':17,34 '0.02':16,33,94,166 '000':86 '0x8335':91 '20':85 '6':99 'Base USDC API' 'accept':74 'access':44,72 'advertis':121 'ai':10,27,133 'analysi':137 'analyt':127 'api':4,21,40,71,111,177,236 'appear':230 'avail':225 'base':7,24,60,87 'behind':50 'broader':119 'catalog':237 'categori':123 'challeng':79 'classif':140 'connect':186 'content':192 'convers':157 'cost':83 'data':9,26,126,130,244 'decim':100 'detail':203 'determin':242 'difficult':240 'doc':176 'document':171,204 'embed':141 'endpoint':14,31,49,64,125,160,207,211,221 'equal':93 'estim':151 'exact':107 'exampl':200 'exchang':146 'export':131 'extrem':173 'feed':145 'financ':11,28,142 'four':122 'function':246 'gas':150 'gate':3,20,43 'generat':158 'geocod':155 'homepag':233 'includ':208 'indic':80 'infrastructur':153 'insight':132 'json-response' 'key':112 'learn':135 'limit':114 'list':68,162,213,235 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':134 'made':103 'make':238 'materi':226 'maximum':82 'metric':128 'micropay':54 'micropayment API' 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':196 'page':181 'pay-per-request API' 'payment':101 'per':52,95,167 'per-request':51 'per-request-micropayment' 'platform':5,22,41,120 'point':170 'post':75 'post-endpoint' 'premium':70 'premium API access' 'price':144,169,178 'prompt':188 'protocol':39 'provid':248 'purpos':217 'quot':149 'rate':113,147 'readm':180 'render':183 'report':129 'request':53,76,96,168 'request/response':199 'requir':117 'schema':197 'scheme':108 'sentiment':136 'settl':55 'spars':174 'specif':63,216 'subscript':116 'summar':139 'text':138 'token':148 'trades API' 'trades/145':220 'unclear':223 'unit':88 'usdc':57,90,97 'usdc-base' 'use':98 'util':13,30,154 'valid':156 'varieti':47 'via':104 'wallet':187 'web3':143 'x402':2,19,38,78,106 'x402 API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"6cea3b47-b2ec-4238-8dd7-94f19f89111b","listingId":"6f59a6bb-c99a-4f19-bf86-45b9f8219efd","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/145","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:42.624Z"}],"sources":[{"listingId":"6f59a6bb-c99a-4f19-bf86-45b9f8219efd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/145","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:42.624Z","lastSeenAt":"2026-04-26T06:33:33.982Z"}],"details":{"listingId":"6f59a6bb-c99a-4f19-bf86-45b9f8219efd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/145 \\\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 returns maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/145"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/145"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade-related data or functionality via a single paid POST request","Programmatic pay-per-use API consumption without managing API keys or subscriptions","Agent-driven workflows that need on-demand data retrieval with crypto micropayments"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible agents settling payments in USDC on Base","Use cases requiring low-cost per-request pricing without commitments"],"notFor":["Users needing detailed API documentation or schema definitions before integration","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.07Z"},"updatedAt":"2026-04-26T06:33:33.982Z"}}