{"id":"5d3ede66-0b3f-4a73-9b54-52e03828376a","shortId":"fgH8jA","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 a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/transactions/132` is listed as \"Premium API Access\" and returns a 402 challenge requiring payment of up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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 are uniformly priced at $0.02 per request.\n\nHowever, the specific endpoint probed here (`/api/v1/transactions/132`) does not clearly map to any of the documented API categories. Its description is simply \"Premium API Access,\" and no further documentation, request schema, or response schema is available. The docs, pricing, and API pages all resolve to a minimal \"Connect wallet\" prompt with no additional technical detail. Without concrete documentation on what this endpoint returns or what input it expects, callers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto-paid API"],"warnings":["No documentation available for this specific endpoint — purpose and response format are unknown","All secondary pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no technical content","The endpoint path /api/v1/transactions/132 does not match any of the advertised API categories on the homepage","No OpenAPI spec, request schema, or response schema is provided"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/132","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/132","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base). However, there is no documentation on what this specific endpoint does, no request/response schema, and the docs/pricing/API pages are all empty beyond a wallet-connect prompt. The endpoint path '/api/v1/transactions/132' with description 'Premium API Access' is vague and not explained anywhere in the crawled 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'/request':13,28 '0.02':12,27,80,152 '000':74 '20':73 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,179 'addit':207 'advertis':108 'ai':120 'analysi':124 'analyt':114 'api':5,20,38,61,84,110,171,178,195 'attach':93 'avail':190 'base':8,23,51,75 'broader':106 'call':4,19,82 'caller':91,223 'categori':111,172 'challeng':67 'classif':127 'clear':164 'concret':211 'connect':202 'convers':144 'crypto-paid API' 'data':113,117 'descript':174 'detail':209 'doc':192 'document':170,183,212 'embed':128 'endpoint':55,147,158,216 'estim':138 'exchang':133 'expect':222 'exploratori':229 'export':118 'feed':132 'financ':129 'gas':137 'generat':145 'geocod':142 'header':98 'howev':155 'http-post' 'i.e':79 'includ':112 'infrastructur':140 'input':220 'insight':119 'integr':230 'key':85 'learn':122 'limit':88 'list':58 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':121 'map':165 'metric':115 'minim':201 'multipl':109 'network':9,24,52 'no-api-key' 'page':196 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,69,97,103 'per':3,18,36,81,153 'platform':6,21,39,107 'premium':60,177 'price':131,150,193 'probe':159 'prompt':204 'proof':104 'protocol':44 'quot':136 'rate':87,134 'report':116 'request':37,154,184 'requir':68,90 'resolv':198 'respons':187 'return':64,217 'schema':185,188 'sentiment':123 'simpli':92,176 'specif':54,157 'summar':126 'technic':208 'text':125 'token':135 'treat':225 'uniform':149 'unit':76 'usdc':15,30,47,78 'usdc-base-network' 'use':41 'util':141 'valid':101,143 'via':10,25 'wallet':203 'web3':130 'without':210 'x':96 'x-payment':95 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"0730f9c5-750e-4061-8867-c52906f11398","listingId":"5d3ede66-0b3f-4a73-9b54-52e03828376a","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/132","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:58:33.392Z"}],"sources":[{"listingId":"5d3ede66-0b3f-4a73-9b54-52e03828376a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/132","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:58:33.392Z","lastSeenAt":"2026-04-23T21:32:37.751Z"}],"details":{"listingId":"5d3ede66-0b3f-4a73-9b54-52e03828376a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/132 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/132"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transactions/132"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Exploring x402 protocol integration for pay-per-use microservices"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can sign USDC transactions on Base","Use cases requiring keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring well-documented request/response schemas","Users without a Base-network USDC wallet","High-volume use cases where per-request crypto settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:43.796Z"},"updatedAt":"2026-04-23T21:32:37.751Z"}}