{"id":"bbdd5919-1a1b-4354-a857-bba5b44cbfd7","shortId":"vLzMLW","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/112` 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 priced at $0.02 per request. However, the specific `/api/v1/trades/112` endpoint does not clearly map to any of these listed categories, and no documentation describes what data or functionality it returns.\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 spec, no request/response schema, and no usage examples available from the crawl. The endpoint is confirmed live (402 challenge captured), but the actual behavior behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["lowpaymentfee","low payment fee API","x402 trades API","micropayment API","pay-per-request API","USDC API","Base network API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README all return only a wallet connect prompt","The endpoint path /api/v1/trades/112 does not appear in the site's listed API catalog, so its purpose is unknown","No request or response schema is provided; callers cannot know what to send or what to expect","No OpenAPI specification or ai-plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/112","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/112","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 x402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no description of what /api/v1/trades/112 actually returns. The docs pages are all empty wallet-connect stubs. This is effectively a stub 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'/api/v1/trades/112':67,174 '/docs':201 '/pricing':203 '/readme':205 '/request':17,34 '0.02':16,33,94,168 '000':86 '0x8335':91 '20':85 '402':239 '6':99 'Base network API' 'USDC API' 'accept':75 'access':45,73 'actual':244 'advertis':81,126 'ai':10,27,138 'analysi':142 'analyt':132 'api':4,21,41,72,102 'attach':111 'avail':230 'base':7,24,61,87 'behavior':245 'behind':51,246 'broader':124 'caller':109 'captur':241 'categori':128,185 'challeng':80,240 'classif':145 'clear':178 'confirm':237 'connect':211 'content':217 'convers':162 'crawl':233 'data':9,26,131,135,191 'decim':100 'describ':189 'document':188,196 'embed':146 'endpoint':14,31,50,65,130,175,235 'equal':93 'estim':156 'exampl':229 'exchang':151 'export':136 'extrem':198 'feed':150 'financ':11,28,147 'four':127 'function':193 'gas':155 'gate':3,20,44 'generat':163 'geocod':160 'header':116 'howev':171 'infrastructur':158 'insight':137 'json-response' 'key':103 'learn':140 'limit':106 'list':69,184 'live':238 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':139 'map':179 'maxamountrequir':83 'metric':133 'micropay':55 'micropayment API' 'network':62 'offer':8,25 'openapi':221 'page':206 'pay-per-request API' 'payment':115,121 'paywal':248 'per':53,95,169 'per-request':52 'per-request-micropayment' 'platform':5,22,42,125 'post':76 'post-endpoint' 'premium':71 'price':149,166 'prompt':213 'proof':122 'protocol':40 'quot':154 'rate':105,152 'render':208 'report':134 'request':54,77,96,170 'request/response':224 'requir':108 'return':195 'schema':225 'sentiment':141 'settl':56 'simpli':110 'spars':199 'spec':222 'specif':64,173 'summar':144 'text':143 'token':153 'unit':88 'unknown':250 'usag':228 'usdc':58,90,97 'usdc-base' 'use':98 'util':13,30,159 'valid':119,161 'varieti':48 'wallet':212 'web3':148 'x':114 'x-payment':113 'x402':2,19,39,79,120 'x402 trades API' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d6869156-3091-47dd-a01d-07a64abb6cb3","listingId":"bbdd5919-1a1b-4354-a857-bba5b44cbfd7","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/112","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:34.602Z"}],"sources":[{"listingId":"bbdd5919-1a1b-4354-a857-bba5b44cbfd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/112","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:34.602Z","lastSeenAt":"2026-04-26T08:32:38.589Z"}],"details":{"listingId":"bbdd5919-1a1b-4354-a857-bba5b44cbfd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/112 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/112"},{"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 in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a Connect wallet prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade-related data behind a per-request micropayment wall","Programmatic pay-per-call API consumption without API keys","Agent-driven workflows that need on-demand premium data access"],"bestFor":["Developers wanting zero-commitment pay-per-use API access","AI agents with x402 payment capability on Base","Users who prefer no API key or subscription overhead"],"notFor":["Users needing detailed API documentation or schemas before purchasing","High-volume consumers who need bulk pricing or rate guarantees","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.487Z"},"updatedAt":"2026-04-26T08:32:38.589Z"}}