{"id":"9e1cf62f-7eec-498a-8c7f-f1f4803ab857","shortId":"xtR75b","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/transfers/143` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 utilities (geocoding, validation, conversion, generation). All endpoints are listed at the same $0.02/request price point.\n\nThis particular endpoint (`/api/v1/transfers/143`) falls under \"Premium API Access\" but the crawled documentation provides no further detail on what data or functionality it returns. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional technical documentation or schema information. Without more detail on the response payload, callers should treat this as an exploratory endpoint with uncertain output.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-method","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 API","USDC pay-per-call","Base network API","micropayment API","402 payment protocol"],"warnings":["No documentation available — docs, pricing, and API pages all render only 'Connect wallet' with no content.","The specific functionality of /api/v1/transfers/143 is undocumented; 'Premium API Access' is the only description.","No request or response schema is provided; callers cannot know what to send or expect back.","The platform lists many endpoint categories (AI, finance, analytics, infrastructure) but provides no evidence any of them return real data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/143","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/transfers/143","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 OpenAPI schema, no documentation beyond a landing page listing, no example request/response payloads, and the docs/pricing/API pages are all empty (just 'Connect wallet'). The specific purpose of /api/v1/transfers/143 is unclear beyond the generic label 'Premium API 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment protocol' 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,92,163 'across':108 'addit':194 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,162,183 'attach':95 'base':8,23,51,73 'broader':104 'call':4,19,80 'caller':207 'categori':110 'challeng':67 'classif':125 'connect':189 'convers':142 'crawl':166 'data':111,115,174 'detail':171,202 'doc':180 'document':167,196 'embed':126 'endpoint':55,107,145,157,214 'estim':136 'exchang':131 'exploratori':213 'export':116 'fall':159 'feed':130 'financ':127 'four':109 'function':176 'gas':135 'generat':143 'geocod':140 'header':99 'i.e':77 'inform':199 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58,147 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':106 'output':217 'page':184 'particular':156 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payload':206 'payment':48,98 'per':3,18,36,79 'platform':6,21,39,82,105 'point':154 'post-method' 'premium':60,161 'price':129,153,181 'prompt':191 'protocol':44 'provid':168 'quot':134 'rate':88,132 'render':186 'report':114 'request':37,68,102 'respons':205 'return':64,178 'schema':198 'sentiment':121 'simpli':94 'specif':54 'summar':124 'technic':195 'text':123 'token':133 'treat':209 'uncertain':216 'unit':74 'usdc':15,30,47,76 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':190 'web3':128 'without':200 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"8893108d-cbf6-4ced-ba42-cfcd1e0e71be","listingId":"9e1cf62f-7eec-498a-8c7f-f1f4803ab857","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/transfers/143","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:33.748Z"}],"sources":[{"listingId":"9e1cf62f-7eec-498a-8c7f-f1f4803ab857","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/143","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:33.748Z","lastSeenAt":"2026-04-23T02:01:53.016Z"}],"details":{"listingId":"9e1cf62f-7eec-498a-8c7f-f1f4803ab857","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/143 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC ($0.02) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/transfers/143"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access.","source_url":"https://lowpaymentfee.com"},{"claim":"The USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913.","source_url":"https://lowpaymentfee.com/api/v1/transfers/143"},{"claim":"Docs, pricing, and API pages render only 'Connect wallet' with no additional content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API data with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless API access with crypto micropayments","Low-volume callers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or response schemas before calling","High-volume production workloads where $0.02/request adds up quickly","Users without a Base network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:34.707Z"},"updatedAt":"2026-04-23T02:01:53.016Z"}}