{"id":"a17b90cd-4e9f-4621-8739-171a82f1651c","shortId":"Pktu9G","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys needed.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys needed.","description":"lowpaymentfee.com offers a suite of pay-per-call API endpoints gated by the x402 protocol on the Base network. The specific endpoint at `/api/v1/trades/125` is listed as \"Premium API Access\" and returns a 402 challenge requesting payment in USDC (contract 0x8335…2913 on Base). The max amount required is 20,000 base units of USDC (6 decimals), which equals $0.02 per request. Payment is made via the x402 exact scheme with no API keys, subscriptions, or rate limits advertised.\n\nThe broader lowpaymentfee.com platform advertises endpoints across 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 (geocoding, validation, conversion, generation). All endpoints are listed at $0.02 per request.\n\nHowever, the specific `/api/v1/trades/125` endpoint does not appear in the site's published API catalog, and no documentation describes what data or functionality it provides. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. Without documentation or an output schema, the actual behavior and response format of this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-on-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["finance","data"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","trades endpoint","premium data access","crypto payment API"],"warnings":["The /api/v1/trades/125 endpoint is not listed in the provider's own published API catalog — its purpose is unclear.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No output schema or response examples are available; actual response format is unknown.","The endpoint path suggests a specific trade record (ID 125), but no context explains what 'trades' means in this platform."],"endpointUrl":"https://lowpaymentfee.com/api/v1/trades/125","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, the /trades/125 path is not listed in the site's own catalog, no documentation exists beyond a wallet-connect prompt, there is no output schema describing the response, and no example request/response bodies are available. This is effectively a stub 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'0.02':10,28,97,163 '000':88 '0x8335':78 '20':87 '2913':79 '402':71 '6':93 'Base network API' 'USDC micropayment API' 'access':6,24,67 'across':123 'actual':215 'advertis':116,121 'ai':133 'amount':84 'analysi':137 'analyt':127 'api':5,16,23,34,46,66,110,179,195 'appear':173 'base':8,26,55,81,89 'behavior':216 'broader':118 'call':45 'catalog':180 'categori':125 'challeng':72 'classif':140 'connect':201 'content':207 'contract':77 'convers':156 'crypto payment API' 'data':126,130,186 'decim':94 'describ':184 'doc':192 'document':183,209 'embed':141 'endpoint':47,59,122,159,170,222 'equal':96 'estim':151 'exact':106 'exchang':146 'export':131 'feed':145 'financ':142 'format':219 'four':124 'function':188 'gas':150 'gate':3,21,48 'generat':157 'geocod':154 'howev':166 'infrastructur':153 'insight':132 'json-response' 'key':17,35,111 'learn':135 'limit':115 'list':63,161 'lowpaymentfee.com':37,119 'machin':134 'made':102 'max':83 'metric':128 'need':18,36 'network':56 'no-api-key' 'offer':38 'output':212 'page':196 'pay':9,27,43 'pay-per-cal':42 'pay-per-call API' 'pay-per-request' 'payment':74,100 'per':11,29,44,98,164 'platform':120 'post-method' 'premium':4,22,65 'premium data access' 'price':144,193 'prompt':203 'protocol':52 'provid':190 'publish':178 'quot':149 'rate':114,147 'remain':223 'render':198 'report':129 'request':12,30,73,99,165 'requir':85 'respons':218 'return':69 'schema':213 'scheme':107 'sentiment':136 'site':176 'specif':58,168 'subscript':112 'suit':40 'summar':139 'text':138 'token':148 'trades endpoint' 'unit':90 'unknown':224 'usdc':14,32,76,92 'usdc-on-base' 'valid':155 'via':103 'wallet':202 'web3':143 'without':208 'x402':2,20,51,105 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"2b82bb35-eaba-476f-aaea-038f699ee881","listingId":"a17b90cd-4e9f-4621-8739-171a82f1651c","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/125","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:57:29.125Z"}],"sources":[{"listingId":"a17b90cd-4e9f-4621-8739-171a82f1651c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/trades/125","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:57:29.125Z","lastSeenAt":"2026-04-26T09:33:34.592Z"}],"details":{"listingId":"a17b90cd-4e9f-4621-8739-171a82f1651c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/trades/125 \\\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 requests maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/trades/125"},{"claim":"USDC contract address on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/trades/125"},{"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 advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing trade-related data or functionality behind a micropayment wall","Agent-driven workflows that need keyless, pay-per-call API access on Base","Programmatic purchasing of premium API responses using USDC"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:46.713Z"},"updatedAt":"2026-04-26T09:33:34.592Z"}}