{"id":"879fa06d-2f17-4c73-9478-4aa994daff38","shortId":"MENmed","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 a broad set of endpoints behind per-request micropayments settled in USDC on the Base network. The specific endpoint `/api/v1/trades/13` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge advertises a max amount of 20,000 base units of USDC (0x8335…), which at 6 decimals equals $0.02 per call — consistent with the site's uniform $0.02/request pricing.\n\nThe platform advertises four categories of APIs: 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 share the same $0.02 pricing and require no API keys, no rate limits, and no commitments — just an x402-compatible payment header per request.\n\nDocumentation is extremely thin. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/trades/13` endpoint actually returns. The endpoint is live (returns a proper 402 challenge), but without documentation it is unclear what input parameters it expects or what data it provides.","tags":[],"capabilities":["x402-payment","usdc-base","per-request-micropayment","post-endpoint","json-response","no-api-key","no-rate-limit"],"categories":["finance","data"],"synonyms":["trades API","premium API access","x402 API","micropayment API","Base USDC API","pay-per-request API","lowpaymentfee"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for /api/v1/trades/13","Purpose of the specific /api/v1/trades/13 endpoint is unknown — 'Premium API Access' is not descriptive","The broader platform lists many endpoint categories but none have documented schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/13","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing, but there is no documentation, no OpenAPI schema, no request/response examples, and no explanation of what the /api/v1/trades/13 endpoint actually returns. Effectively a stub 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'/request':17,34,106 '0.02':16,33,96,105,153 '000':85 '0x8335':90 '20':84 '402':222 '6':93 'Base USDC API' 'accept':73 'access':71 'actual':213 'advertis':79,110 'ai':10,27,122 'amount':82 'analysi':126 'analyt':116 'api':4,21,41,70,114,158,181 'base':7,24,60,86 'behind':50 'broad':46 'call':98 'categori':112 'challeng':78,223 'classif':129 'commit':165 'compat':170 'connect':190 'consist':99 'content':196 'convers':146 'data':9,26,115,119,237 'decim':94 'descript':207 'doc':180 'document':175,226 'embed':130 'endpoint':14,31,49,64,149,212,216 'equal':95 'estim':140 'exampl':204 'exchang':135 'expect':234 'export':120 'extrem':177 'feed':134 'financ':11,28,131 'four':111 'gas':139 'gate':3,20,44 'generat':147 'geocod':144 'header':172 'infrastructur':142 'input':231 'insight':121 'json-response' 'key':159 'learn':124 'limit':162 'list':67 'live':218 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':123 'max':81 'metric':117 'micropay':54 'micropayment API' 'network':61 'no-api-key' 'no-rate-limit' 'offer':8,25 'openapi':200 'page':185 'paramet':232 'pay-per-request API' 'payment':171 'per':52,97,173 'per-request':51 'per-request-micropayment' 'platform':5,22,42,109 'post':74 'post-endpoint' 'premium':69 'premium API access' 'price':107,133,154,182 'prompt':192 'proper':221 'protocol':40 'provid':239 'quot':138 'rate':136,161 'readm':184 'render':187 'report':118 'request':53,75,174 'request/response':203 'requir':156 'return':214,219 'schema':201 'sentiment':125 'set':47 'settl':55 'share':150 'site':102 'specif':63 'summar':128 'text':127 'thin':178 'token':137 'trades API' 'unclear':229 'uniform':104 'unit':87 'usdc':57,89 'usdc-base' 'util':13,30,143 'valid':145 'wallet':191 'web3':132 'without':225 'x402':2,19,39,77,169 'x402 API' 'x402-compatible':168 'x402-gated':1,18 'x402-payment' 'x402-protocol':38","prices":[{"id":"f7dbbd3f-912a-424b-9a84-cc3954e51f79","listingId":"879fa06d-2f17-4c73-9478-4aa994daff38","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/13","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:29.748Z"}],"sources":[{"listingId":"879fa06d-2f17-4c73-9478-4aa994daff38","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/13","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:29.748Z","lastSeenAt":"2026-04-26T09:33:34.650Z"}],"details":{"listingId":"879fa06d-2f17-4c73-9478-4aa994daff38","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/13 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","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/13"},{"claim":"The site advertises uniform $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform lists four API categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","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 via a single micropayment without API key registration","Programmatic agents purchasing API calls on-the-fly using x402 protocol","Exploring low-friction pay-per-use API access on Base network"],"bestFor":["Agents or developers wanting zero-signup, pay-per-call API access","x402-compatible wallets and clients on Base","Use cases where per-request billing is preferred over subscriptions"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.646Z"},"updatedAt":"2026-04-26T09:33:34.650Z"}}