{"id":"6609bf29-7505-470b-a628-a6a2830ceea4","shortId":"Z2zeCF","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 provides a collection of pay-per-request endpoints across four categories: 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 priced at $0.02 per request, paid in USDC on the Base network.\n\nThe specific endpoint `/api/v1/trades/65` is listed as \"Premium API Access\" and is confirmed live via a 402 challenge. It accepts POST requests and requires an x402 payment of up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is settled on-chain with no API keys, no rate limits, and no commitments required — callers simply attach an X-PAYMENT header to each request.\n\nDocumentation is extremely sparse. The crawled /docs, /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/trades/65` endpoint actually returns. The endpoint path suggests trade-related data but this is inferred from the URL pattern alone.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["finance","data","api-gateway"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-call API","Base USDC API","trades endpoint"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet connect prompt","No OpenAPI or schema describing request parameters or response format for /api/v1/trades/65","The purpose of the /api/v1/trades/65 endpoint is unclear; 'Premium API Access' is a generic label","Cannot verify what data is actually returned without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/65","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of /api/v1/trades/65 is unclear. The docs pages are all empty wallet-connect 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'/api/v1/trades/65':106,211 '/docs':180 '/pricing':182 '/readme':184 '/request':17,34 '0.02':16,33,93,145 '000':134 '0x8335':139 '20':133 '2913':140 '402':119 'Base USDC API' 'accept':122 'access':112 'across':52 'actual':213 'ai':10,27,62 'alon':231 'analysi':66 'analyt':56 'api':4,21,40,111,154 'attach':165 'base':7,24,101,135,142 'caller':163 'categori':54 'chain':151 'challeng':120 'classif':69 'collect':45 'commit':161 'confirm':115 'connect':190 'content':196 'convers':86 'crawl':179 'data':9,26,55,59,222 'descript':207 'document':174 'embed':70 'endpoint':14,31,51,89,105,212,216 'equal':144 'estim':80 'exampl':204 'exchang':75 'export':60 'extrem':176 'feed':74 'financ':11,28,71 'four':53 'gas':79 'gate':3,20 'generat':87 'geocod':84 'header':170 'infer':226 'infrastructur':82 'insight':61 'json-response' 'key':155 'learn':64 'limit':158 'list':108 'live':116 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':63 'metric':57 'micropayment API' 'network':102 'no-api-key' 'offer':8,25 'on-chain':149 'openapi':200 'page':185 'paid':96 'path':217 'pattern':230 'pay':48 'pay-per-call API' 'pay-per-request':47 'payment':129,146,169 'per':49,94 'platform':5,22,41 'post':123 'post-endpoint' 'premium':110 'price':73,91 'prompt':192 'protocol':39 'provid':43 'quot':78 'rate':76,157 'relat':221 'report':58 'request':50,95,124,173 'request/response':203 'requir':126,162 'return':187,214 'schema':201 'sentiment':65 'settl':148 'simpli':164 'spars':177 'specif':104 'substant':195 'suggest':218 'summar':68 'text':67 'token':77 'trade':220 'trade-rel':219 'trades endpoint' 'unit':136 'url':229 'usdc':98,138 'usdc-base' 'util':13,30,83 'valid':85 'via':117 'wallet':191 'web3':72 'x':168 'x-payment':167 'x402':2,19,38,128 'x402 trades API' 'x402-gated':1,18 'x402-payment'","prices":[{"id":"ae904138-05c3-4f0b-950f-f45c5e20655d","listingId":"6609bf29-7505-470b-a628-a6a2830ceea4","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/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:58.648Z"}],"sources":[{"listingId":"6609bf29-7505-470b-a628-a6a2830ceea4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:58.648Z","lastSeenAt":"2026-04-22T13:31:42.281Z"}],"details":{"listingId":"6609bf29-7505-470b-a628-a6a2830ceea4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/65 \\\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 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/65"},{"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 offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/trades/65"}],"useCases":["Fetching trade-related data with per-request micropayments","Programmatic access to premium API content without subscription or API key management","Agent-driven workflows that need on-demand paid data retrieval on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer no-signup, wallet-based API authentication"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.331Z"},"updatedAt":"2026-04-22T13:31:42.281Z"}}