{"id":"d23b2dbf-4894-4126-92da-3a49f669213c","shortId":"w2XEC9","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 catalog of pay-per-request endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are priced at $0.02 per request, paid in USDC on the Base network, with no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/transactions/287` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) on Base. Payment is made via the x402 exact scheme, settling to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout. The endpoint accepts HTTP POST 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 doc/pricing/API pages just show \"Connect wallet\"), so the actual functionality, request schemas, and response formats for each endpoint are unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","http-post"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access"],"warnings":["No documentation available — all doc pages render only 'Connect wallet'","No OpenAPI or request/response schema provided for any endpoint","The specific purpose of /api/v1/transactions/287 ('Premium API Access') is unclear and not described anywhere","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/287","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/287","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, there is no documentation, no OpenAPI schema, no request/response examples, and the docs/pricing/API pages are all blank ('Connect wallet' only). The actual functionality behind 'Premium API Access' at /api/v1/transactions/287 is completely 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'/request':13,28 '0.02':12,27,65,111,175 '000':106 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '20':105 '300':134 '402':100 '6':116 'Base network API' 'USDC micropayment API' 'accept':139 'access':96 'across':50 'actual':196 'address':130 'advertis':148 'ai/ml':53 'analysi':152 'analyt':52 'api':5,20,37,77,95 'application/json':144 'base':8,23,73,107,119 'beyond':180 'broad':42 'broader':146 'call':4,19 'catalog':43 'challeng':101 'classif':155 'connect':192 'convers':167 'crypto API access' 'data':51,56,169 'decim':117 'doc/pricing/api':188 'document':179 'embed':156 'empti':186 'enabl':36 'endpoint':49,61,88,138,149,205 'essenti':185 'estim':164 'exact':126 'exchang':159 'feed':158 'finance/web3':55 'format':202 'function':197 'gas':163 'generat':170 'geocod':165 'howev':178 'http':140 'http-post' 'infer':54 'json-api' 'key':78 'land':182 'limit':81 'list':92 'lowpaymentfee' 'lowpaymentfee.com':31 'made':122 'network':9,24,74 'offer':40 'page':183,189 'paid':68 'pay':2,17,46 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':45 'payment':120 'per':3,18,47,66 'platform':6,21,38,147 'point':177 'post':141 'premium':94 'price':63,157,176 'quot':162 'rate':80,160 'request':48,67,102,198 'requir':85 'respons':201 'return':98,143 'schema':199 'scheme':127 'second':135 'sentiment':151 'servic':59 'settl':128 'show':191 'sinc':113 'specif':87 'subscript':84 'summar':154 'text':153 'timeout':136 'token':161 'unit':108 'unknown':207 'usd':112 'usdc':15,30,70,110,114 'usdc-base' 'use':115 'util':58 'valid':166 'via':10,25,123 'wallet':193 'x402':11,26,35,125 'x402 API' 'x402-enabled':34 'x402-payment'","prices":[{"id":"33e0f95e-dc29-48ef-a876-2a168868a007","listingId":"d23b2dbf-4894-4126-92da-3a49f669213c","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/287","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:57.685Z"}],"sources":[{"listingId":"d23b2dbf-4894-4126-92da-3a49f669213c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/287","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:57.685Z","lastSeenAt":"2026-04-22T19:32:17.349Z"}],"details":{"listingId":"d23b2dbf-4894-4126-92da-3a49f669213c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/287 \\\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 (0.02 USD) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/transactions/287"},{"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 API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows needing frictionless per-call payment"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or request/response schemas before purchasing","High-volume use cases where per-call pricing becomes expensive","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:39.779Z"},"updatedAt":"2026-04-22T19:32:17.349Z"}}