{"id":"ecd9f525-3aad-4c07-8fa8-f7aac6f6b1ad","shortId":"jpT2tD","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 access to a variety of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint at `/api/v1/trades/38` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (0x8335…), which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 are listed at the same $0.02/request price point. However, the specific `/api/v1/trades/38` endpoint does not clearly map to any of these advertised categories, and its exact functionality is not documented beyond the generic \"Premium API Access\" label.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns 402 with a valid x402 challenge), but what data or service it actually returns upon successful payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","no-api-key","no-rate-limit"],"categories":["api-marketplace","finance"],"synonyms":["x402 API","micropayment API","pay-per-request API","Base USDC API","lowpaymentfee","trades API","x402 premium access"],"warnings":["The specific endpoint /api/v1/trades/38 is not listed among the advertised API categories on the homepage — its actual functionality is unknown.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available — callers cannot know what to send or what to expect back.","The endpoint's purpose ('Premium API Access') is a generic label with no specifics."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/38","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/38","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 x402 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no request/response schemas, no examples. The /trades/38 path doesn't match any of the advertised endpoint categories. Effectively a stub 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'/api/v1/trades/38':67,177 '/docs':208 '/pricing':210 '/readme':212 '/request':17,34,171 '0.02':16,33,94,170 '000':86 '0x8335':91 '20':85 '402':245 '6':99 'Base USDC API' 'accept':75 'access':45,73,201 'actual':257 'advertis':81,126,187 'ai':10,27,138 'analysi':142 'analyt':132 'api':4,21,41,72,102,200 'attach':111 'avail':238 'base':7,24,61,87 'behind':51 'beyond':196 'broader':124 'caller':109 'categori':128,188 'challeng':80,250 'classif':145 'clear':181 'confirm':242 'connect':218 'content':224 'convers':162 'data':9,26,131,135,253 'decim':100 'document':195,203,233 'embed':146 'endpoint':14,31,50,65,130,178,240 'equal':93 'estim':156 'exact':191 'exampl':236 'exchang':151 'export':136 'extrem':205 'feed':150 'financ':11,28,147 'four':127 'function':192 'gas':155 'gate':3,20,44 'generat':163 'generic':198 'geocod':160 'header':116 'howev':174 'infrastructur':158 'insight':137 'key':103 'label':202 'learn':140 'limit':106 'list':69,166 'live':243 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':139 'map':182 'marketplac':42 'maxamountrequir':83 'metric':133 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':228 'page':213 'pay-per-request API' 'payload':237 'payment':115,121,261 'per':53,95 'per-request':52 'per-request-micropayment' 'platform':5,22,125 'point':173 'post':76 'post-endpoint' 'premium':71,199 'price':149,172 'prompt':220 'proof':122 'protocol':40 'quot':154 'rate':105,152 'render':215 'report':134 'request':54,77,96 'request/response':231 'requir':108 'return':244,258 'schema':232 'sentiment':141 'servic':255 'settl':56 'simpli':110 'spars':206 'spec':229 'specif':64,176 'substant':223 'success':260 'summar':144 'text':143 'token':153 'trades API' 'unit':88 'unknown':263 'upon':259 'usdc':58,90,97 'usdc-base' 'use':98 'util':13,30,159 'valid':119,161,248 'varieti':48 'wallet':219 'web3':148 'x':114 'x-payment':113 'x402':2,19,39,79,120,249 'x402 API' 'x402 premium access' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d97db648-5a9c-474f-b34d-a074e9ac88c9","listingId":"ecd9f525-3aad-4c07-8fa8-f7aac6f6b1ad","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/38","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:49.743Z"}],"sources":[{"listingId":"ecd9f525-3aad-4c07-8fa8-f7aac6f6b1ad","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/38","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:49.743Z","lastSeenAt":"2026-04-22T17:02:09.592Z"}],"details":{"listingId":"ecd9f525-3aad-4c07-8fa8-f7aac6f6b1ad","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/38 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/trades/38 specifies maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base.","source_url":"https://lowpaymentfee.com/api/v1/trades/38"},{"claim":"The platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) show only 'Connect wallet' with no substantive content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade-related data or functionality via a single paid POST request","Integrating pay-per-call APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled in USDC on Base"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 micropayments autonomously","Users who prefer crypto-native API billing without accounts"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.733Z"},"updatedAt":"2026-04-22T17:02:09.592Z"}}