{"id":"51efd203-1519-4350-a394-b7e34e1a98cf","shortId":"kfgVFY","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/55` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a maximum cost 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 organizes its endpoints into 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 listed endpoints share the same $0.02/request pricing.\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 documentation, and no usage examples available from the crawled material. The specific behavior of `/api/v1/trades/55` — what input it expects and what data it returns — is not documented anywhere in the crawled pages. The endpoint is confirmed live via a valid 402 challenge response.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","post-endpoint","json-response"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-call API","x402 endpoint","USDC API","Base network API","trades API","low fee API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or schema definition for request or response payloads","The specific purpose and expected input of /api/v1/trades/55 is undocumented","The endpoint path includes a numeric ID (55) suggesting a specific resource, but no context is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/55","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (valid 402 challenge captured) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and no examples. The purpose of `/api/v1/trades/55` is entirely opaque — the name 'Premium API Access' is generic and the path suggests a specific trade record but nothing confirms 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'/request':17,34,173 '0.02':16,33,95,172 '000':87 '0x8335':92 '20':86 '402':245 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73 'advertis':81 'ai':10,27,140 'analysi':144 'analyt':134 'anywher':232 'api':4,21,41,72,103,181 'attach':112 'avail':210 'base':7,24,61,88 'base-network' 'behavior':217 'behind':51 'broader':125 'caller':110 'categori':132 'challeng':80,246 'classif':147 'confirm':240 'connect':190 'content':196 'convers':164 'cost':84 'crawl':213,235 'data':9,26,133,137,226 'decim':101 'doc':180 'document':175,205,231 'embed':148 'endpoint':14,31,50,65,129,168,238 'equal':94 'estim':158 'exampl':209 'exchang':153 'expect':223 'export':138 'extrem':177 'feed':152 'financ':11,28,149 'four':131 'gas':157 'gate':3,20,44 'generat':165 'geocod':162 'header':117 'infrastructur':160 'input':221 'insight':139 'json-response' 'key':104 'learn':142 'limit':107 'list':69,167 'live':241 'low fee API' 'lowpaymentfee.com':35 'machin':141 'marketplac':42 'materi':214 'maximum':83 'metric':135 'micropay':55 'micropayment API' 'network':62 'no-api-key' 'offer':8,25 'openapi':200 'organ':127 'page':185,236 'pay-per-call API' 'payment':116,122 'per':53,96 'per-request':52 'per-request-billing' 'platform':5,22,126 'post':76 'post-endpoint' 'premium':71 'price':151,174,182 'prompt':192 'proof':123 'protocol':40 'quot':156 'rate':106,154 'readm':184 'render':187 'report':136 'request':54,77,97 'request/response':203 'requir':109 'respons':247 'return':228 'schema':204 'sentiment':143 'settl':56 'share':169 'simpli':111 'spars':178 'spec':201 'specif':64,216 'summar':146 'text':145 'token':155 'trades API' 'unit':89 'usag':208 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30,161 'valid':120,163,244 'varieti':48 'via':242 'wallet':191 'web3':150 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"f61e2103-8d1f-4afe-ab52-dd746358c563","listingId":"51efd203-1519-4350-a394-b7e34e1a98cf","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/55","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:08.273Z"}],"sources":[{"listingId":"51efd203-1519-4350-a394-b7e34e1a98cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/55","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:08.273Z","lastSeenAt":"2026-04-26T01:02:58.458Z"}],"details":{"listingId":"51efd203-1519-4350-a394-b7e34e1a98cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/55 \\\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/55"},{"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":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, 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 data behind a per-request micropayment wall","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to premium data endpoints"],"bestFor":["AI agents that need keyless, pay-per-call API access","Developers experimenting with x402 micropayment protocols","Use cases requiring low-friction, no-commitment API access on Base"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:44.836Z"},"updatedAt":"2026-04-26T01:02:58.458Z"}}