{"id":"61b47b53-5eae-4306-8c6a-6f433046d4b6","shortId":"qnpjJB","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network via the x402 payment protocol. No API keys, accounts, or rate limits are advertised — callers simply attach an x402 payment header to each request.\n\nThe specific endpoint at `/api/v1/transactions/62` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The payment scheme is \"exact\" with a 300-second timeout. The endpoint accepts POST requests and returns application/json.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is essentially empty (all sub-pages just show \"Connect wallet\"), so the actual behavior, request schemas, and response formats for each endpoint are unknown. The specific functionality behind the `/api/v1/transactions/62` path is not documented.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","json-response","post-method"],"categories":["infrastructure","api-marketplace"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","402 payment API"],"warnings":["No documentation available — all doc/pricing/API pages return only 'Connect wallet' with no content","The specific functionality of /api/v1/transactions/62 is undocumented; 'Premium API Access' is a generic label","No request or response schema is provided; callers cannot know what to send or expect back","No OpenAPI specification or machine-readable API description found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/62","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/62","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 documentation for request/response schemas, no OpenAPI spec, and all doc pages are empty. The purpose of the specific /api/v1/transactions/62 endpoint is unclear beyond the generic label 'Premium API 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'/request':13,30 '0.02':12,29,63,128,182 '000':117 '0x8335':122 '20':116 '2913':123 '300':141 '402':111 '402 payment API' '6':132 'Base network API' 'USDC micropayment API' 'accept':146 'access':107 'account':81 'across':49 'actual':204 'advertis':86,155 'ai/ml':52 'analysi':159 'analyt':51 'api':5,15,22,32,41,79,106 'application/json':151 'attach':89 'base':8,25,71,118,125 'behavior':205 'behind':219 'beyond':187 'broader':153 'call':4,21 'caller':87 'challeng':112 'classif':162 'connect':200 'convers':174 'data':50,176 'decim':133 'document':186,225 'embed':163 'empti':193 'enabl':40 'endpoint':48,59,99,145,156,213 'equal':127 'essenti':192 'estim':171 'exact':138 'exchang':166 'feed':165 'finance/web3':54 'format':210 'function':218 'gas':170 'generat':177 'geocod':172 'given':129 'header':93 'howev':185 'infer':53 'infrastructur':56 'json-response' 'key':16,33,80 'land':189 'limit':84 'list':103 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':35 'network':9,26,72 'no-api-key' 'offer':44 'page':190,197 'path':222 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'pay-per-request' 'payabl':66 'payment':76,92,135 'per':3,20,64 'platform':6,23,42,154 'point':184 'post':147 'post-method' 'premium':105 'price':61,164,183 'protocol':77 'quot':169 'rate':83,167 'request':65,96,113,148,206 'requir':17,34 'respons':209 'return':109,150 'schema':207 'scheme':136 'second':142 'sentiment':158 'show':199 'simpli':88 'specif':98,217 'sub':196 'sub-pag':195 'summar':161 'text':160 'timeout':143 'token':168 'unit':119 'unknown':215 'usdc':68,121,130 'usdc-base' 'util':57 'valid':173 'varieti':46 'via':10,27,73 'wallet':201 'x402':11,28,39,75,91 'x402 API' 'x402-enabled':38 'x402-payment'","prices":[{"id":"1d530ec7-1c5e-4cfb-a27e-9a0f9dbb4ac2","listingId":"61b47b53-5eae-4306-8c6a-6f433046d4b6","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/62","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:26:52.672Z"}],"sources":[{"listingId":"61b47b53-5eae-4306-8c6a-6f433046d4b6","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/62","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:26:52.672Z","lastSeenAt":"2026-04-22T17:02:18.501Z"}],"details":{"listingId":"61b47b53-5eae-4306-8c6a-6f433046d4b6","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/62 \\\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":"All endpoints 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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/transactions/62"},{"claim":"Platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without creating accounts or managing API keys","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven workflows that need frictionless pay-as-you-go API access"],"bestFor":["Developers or agents wanting zero-signup API access via crypto micropayments","Testing x402 payment protocol integrations","Low-volume, on-demand API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where per-request pricing at $0.02 adds up quickly","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:36.661Z"},"updatedAt":"2026-04-22T17:02:18.501Z"}}