{"id":"67934213-ee13-473a-9209-80dc88a1ebd7","shortId":"Me3CKw","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. Every endpoint costs $0.02 per request, paid in USDC on the Base network with no API keys, no rate limits, and no commitments required. The x402 protocol handles payment inline: callers receive a 402 challenge with payment details, settle in USDC, and get their response.\n\nThe specific endpoint at `/api/v1/transactions/333` is listed as \"Premium API Access\" and accepts POST requests. The 402 challenge shows a maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nThe platform also advertises sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02 price point. Documentation pages (docs, pricing, README) appear to require wallet connection and contain no substantive content, so the actual request/response schemas for this endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","finance","ai"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No request or response schema available — the actual functionality of /api/v1/transactions/333 is undocumented","All documentation pages (docs, pricing, README) are empty or require wallet connection, providing no useful information","The endpoint name 'Premium API Access' is generic and does not describe what data or service is returned","Cannot verify what the endpoint actually does without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/333","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/transactions/333","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 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation of request/response formats, and all doc pages just show 'Connect wallet' with no content. The purpose of this specific '/transactions/333' endpoint is unclear beyond the generic 'Premium API Access' 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'/request':13,28 '0.02':12,27,59,134,181 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':129 '20000':123 '300':148 '402':89,117 '6':138 'Base network API' 'USDC pay-per-call' 'accept':113 'access':111 'across':46 'actual':201 'address':144 'advertis':154 'ai/ml':49 'also':153 'analysi':159 'analyt':48 'api':5,20,37,71,110 'appear':189 'asset':128 'base':8,23,67,124,131 'broad':42 'call':4,19 'caller':86 'challeng':90,118 'classif':162 'commit':78 'connect':193 'contain':195 'content':198 'convers':174 'cost':58 'crypto-paid API' 'data':47,52 'decim':139 'detail':93 'doc':186 'document':184 'embed':163 'enabl':36 'endpoint':45,57,103,156,206 'equal':133 'estim':171 'everi':56 'exchang':166 'feed':165 'finance/web3':51 'gas':170 'generat':176 'geocod':172 'get':98 'given':135 'handl':83 'infer':50 'inlin':85 'json-response' 'key':72 'limit':75 'list':107 'lowpaymentfee' 'lowpaymentfee.com':31 'maxamountrequir':121 'micropayment API' 'network':9,24,68 'no-api-key' 'offer':40 'page':185 'paid':62 'pay':2,17 'pay-per-cal':1,16 'pay-per-request' 'payment':84,92,140 'per':3,18,60 'platform':6,21,38,152 'point':183 'post':114 'post-endpoint' 'premium':109 'premium API access' 'price':164,182,187 'protocol':82 'quot':169 'rate':74,167 'readm':188 'receiv':87 'request':61,115 'request/response':202 'requir':79,191 'respons':100 'schema':203 'second':149 'sent':142 'sentiment':158 'servic':55 'set':43 'settl':94 'show':119 'sibl':155 'specif':102 'substant':197 'summar':161 'text':160 'timeout':150 'token':168 'unit':125 'unknown':208 'usdc':15,30,64,96,127,136 'usdc-base-network' 'util':54 'valid':173 'via':10,25 'wallet':192 'x402':11,26,35,81 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"6ff0f03f-3631-4f28-8412-8d82088be3c3","listingId":"67934213-ee13-473a-9209-80dc88a1ebd7","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/transactions/333","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:13.174Z"}],"sources":[{"listingId":"67934213-ee13-473a-9209-80dc88a1ebd7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/333","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:13.174Z","lastSeenAt":"2026-04-22T10:02:27.076Z"}],"details":{"listingId":"67934213-ee13-473a-9209-80dc88a1ebd7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/333 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with maxAmountRequired of 20000 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/333"},{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transactions/333"},{"claim":"Platform offers endpoints across data analytics, AI/ML, finance/Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API data without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Integrating pay-per-use endpoints into agent workflows via x402 protocol"],"bestFor":["Developers who want instant API access without signup or API keys","Agents and bots that can settle x402 payments autonomously on Base","Users comfortable paying in USDC for low-cost per-request pricing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:38.621Z"},"updatedAt":"2026-04-22T10:02:27.076Z"}}