{"id":"9ebb87a9-fe3a-49cd-b5fd-e8123d5dc6e9","shortId":"Amn94P","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/4` 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 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.\n\nDocumentation is extremely sparse. The /docs, /pricing, /api, 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 crawl. The specific functionality behind `/api/v1/trades/4` is unclear — the name \"Premium API Access\" is generic and the endpoint path suggests trade-related data but no details are provided. Callers should expect JSON responses (mimeType is application/json) but the exact request body format and response structure are unknown.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-request-billing","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["micropayment API","pay-per-call API","x402 endpoint","USDC API","Base network API","trades API","low fee API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README all return only a wallet connect prompt","No OpenAPI or schema definition for request or response bodies","The specific functionality of /api/v1/trades/4 ('Premium API Access') is completely undocumented","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/4","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page listing, and the specific purpose of /api/v1/trades/4 is undefined. The docs pages are all empty wallet-connect 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'/api/v1/trades/4':67,215 '/docs':177 '/pricing':178 '/readme':181 '/request':17,34 '0.02':16,33,95,169 '000':87 '0x8335':92 '20':86 '6':100 'Base network API' 'USDC API' 'accept':75 'access':45,73,222 'advertis':81,127 'ai':10,27,139 'analysi':143 'analyt':133 'api':4,21,41,72,103,221 'application/json':246 'attach':112 'avail':207 'base':7,24,61,88 'base-network' 'behind':51,214 'bodi':251 'broader':125 'caller':110,239 'categori':129 'challeng':80 'classif':146 'connect':187 'content':193 'convers':163 'cost':84 'crawl':210 'data':9,26,132,136,233 'decim':101 'detail':236 'document':172,202 'embed':147 'endpoint':14,31,50,65,131,227 'equal':94 'estim':157 'exact':249 'exampl':206 'exchang':152 'expect':241 'export':137 'extrem':174 'feed':151 'financ':11,28,148 'format':252 'four':128 'function':213 'gas':156 'gate':3,20,44 'generat':164 'generic':224 'geocod':161 'header':117 'infrastructur':159 'insight':138 'json':242 'json-response' 'key':104 'learn':141 'limit':107 'list':69 'low fee API' 'lowpaymentfee.com':35 'machin':140 'marketplac':42 'maximum':83 'metric':134 'micropay':55 'micropayment API' 'mimetyp':244 'name':219 'network':62 'no-api-key' 'offer':8,25 'openapi':197 'page':182 'path':228 'pay-per-call API' 'payment':116,122 'per':53,96,170 'per-request':52 'per-request-billing' 'platform':5,22,126 'post':76 'post-method' 'premium':71,220 'price':150,167 'prompt':189 'proof':123 'protocol':40 'provid':238 'quot':155 'rate':106,153 'relat':232 'render':184 'report':135 'request':54,77,97,171,250 'request/response':200 'requir':109 'respons':243,254 'schema':201 'sentiment':142 'settl':56 'simpli':111 'spars':175 'spec':198 'specif':64,212 'structur':255 'suggest':229 'summar':145 'text':144 'token':154 'trade':231 'trade-rel':230 'trades API' 'unclear':217 'unit':89 'unknown':257 'usag':205 'usdc':58,91,98 'usdc-micropayment' 'use':99 'util':13,30,160 'valid':120,162 'varieti':48 'wallet':188 'web3':149 'x':115 'x-payment':114 'x402':2,19,39,79,121 'x402 endpoint' 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"d7b6320e-4ed0-4b57-828b-275abb1b4faa","listingId":"9ebb87a9-fe3a-49cd-b5fd-e8123d5dc6e9","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/4","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:55.660Z"}],"sources":[{"listingId":"9ebb87a9-fe3a-49cd-b5fd-e8123d5dc6e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/4","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:55.660Z","lastSeenAt":"2026-04-26T03:03:00.022Z"}],"details":{"listingId":"9ebb87a9-fe3a-49cd-b5fd-e8123d5dc6e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/4 \\\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 advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/4"},{"claim":"All 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 Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing trade-related data via a single micropayment without needing an API key","Programmatic agents making pay-per-call requests for premium data on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-request API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume production workloads where per-request costs add up without bulk discounts","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:45.498Z"},"updatedAt":"2026-04-26T03:03:00.022Z"}}