{"id":"1bd144ef-3daf-4d4c-ae4c-903e4bc5c748","shortId":"Kw9TyL","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/52` 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 — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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/52`) falls under \"Premium API Access\" but its specific functionality is not documented beyond that label. The docs, pricing, and API pages all appear to require a wallet connection and provide no additional detail. The endpoint accepts POST requests and returns `application/json`. Payment is settled in USDC on Base to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","usdc api access","base network api","402 payment api"],"warnings":["The specific functionality of /api/v1/transfers/52 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) render only a wallet-connect prompt with no substantive content.","No request body schema or response schema is provided, making integration difficult without trial and error.","The endpoint path suggests a transfer operation but details are unknown — exercise caution."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/52","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/52","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), but there is no documentation of what this specific endpoint actually does, no request/response schema, and no examples. The docs/pricing/API pages all render only a wallet-connect prompt with no useful content. The 'Premium API Access' label is generic and 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'/request':13,28,156 '0.02':12,27,78,155 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':213 '20':71 '402':66 '402 payment api' 'accept':46,198 'access':62,92,167 'across':112 'addit':194 'address':212 'advertis':83 'ai':122 'analysi':126 'analyt':116 'api':5,20,38,61,85,166,182 'appear':185 'application/json':203 'attach':95 'base':8,23,51,73,210 'base network api' 'beyond':175 'broader':108 'call':4,19,80 'caller':93 'categori':114 'challeng':67 'classif':129 'connect':190 'convers':146 'data':115,119 'detail':195 'doc':179 'document':174 'embed':130 'endpoint':55,111,149,161,197 'estim':140 'exchang':135 'export':120 'fall':163 'feed':134 'financ':131 'four':113 'function':171 'gas':139 'generat':147 'geocod':144 'header':100 'i.e':77 'infrastructur':142 'insight':121 'instant':91 'json-response' 'key':86 'label':177 'learn':124 'limit':89 'list':58,151 'low payment fee' 'lowpaymentfee.com':31 'machin':123 'metric':117 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':110 'page':183 'particular':160 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,99,105,204 'per':3,18,36,79 'platform':6,21,39,82,109 'point':158 'post':199 'post-method' 'premium':60,165 'price':133,157,180 'proof':106 'protocol':44 'provid':192 'quot':138 'rate':88,136 'report':118 'request':37,68,200 'requir':187 'return':64,202 'sentiment':125 'settl':206 'simpli':94 'specif':54,170 'summar':128 'text':127 'token':137 'unit':74 'usdc':15,30,47,76,208 'usdc api access' 'usdc-base' 'use':41 'util':143 'valid':103,145 'via':10,25 'wallet':189 'web3':132 'x':98 'x-payment':97 'x402':11,26,43,104 'x402 api' 'x402-payment'","prices":[{"id":"5fceebc7-e3d9-44c4-88b5-91c589589fdc","listingId":"1bd144ef-3daf-4d4c-ae4c-903e4bc5c748","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/52","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:27:51.781Z"}],"sources":[{"listingId":"1bd144ef-3daf-4d4c-ae4c-903e4bc5c748","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/52","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:27:51.781Z","lastSeenAt":"2026-04-22T23:02:17.619Z"}],"details":{"listingId":"1bd144ef-3daf-4d4c-ae4c-903e4bc5c748","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/52 \\\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 requesting up to 20,000 base units of USDC ($0.02) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transfers/52"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/transfers/52"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, on-demand API access","Testing x402 payment flows on Base network"],"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 who need detailed API documentation before integrating","High-volume consumers who want bulk pricing or subscriptions","Developers who cannot transact in USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.866Z"},"updatedAt":"2026-04-22T23:02:17.619Z"}}