{"id":"679c53da-4cce-4ca8-aecf-451c8faa2e18","shortId":"XdeV9D","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/9` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) 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 $0.02 per request. Payments settle in USDC on Base to the address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.\n\nThe specific functionality behind the `/api/v1/transfers/9` endpoint is not documented in the crawled material — the description simply says \"Premium API Access\" without further detail. The docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no additional content. Because of this, the actual response payload and input parameters for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","crypto"],"synonyms":["lowpaymentfee","low payment fee API","x402 USDC API","pay-per-call API","Base network API","micropayment API"],"warnings":["The actual functionality of /api/v1/transfers/9 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) render only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, no input schema, and no example responses are available.","The broader platform lists many endpoint categories but none have detailed documentation in the crawled material."],"endpointUrl":"https://lowpaymentfee.com/api/v1/transfers/9","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/9","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 of what the endpoint actually does, no input/output schema, no example responses, and the docs pages are empty. The listing is effectively a stub with only payment metadata 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'/request':13,28 '0.02':12,27,78,154 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':166 '20':71 '402':66 '6':82 'Base network API' 'accept':46 'access':62,97,187 'across':113 'actual':212 'addit':206 'address':165 'advertis':88 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,90,186,195 'attach':100 'base':8,23,51,73,162 'behind':170 'broader':109 'call':4,19,85 'categori':115 'challeng':67 'classif':130 'connect':201 'content':207 'convers':147 'crawl':179 'data':116,120 'decim':83 'descript':182 'detail':190 'doc':192 'document':176 'embed':131 'endpoint':55,112,150,173,220 'estim':141 'exchang':136 'export':121 'feed':135 'financ':132 'four':114 'function':169 'gas':140 'generat':148 'geocod':145 'given':79 'header':104 'i.e':77 'infrastructur':143 'input':216 'insight':122 'instant':96 'json-response' 'key':91 'learn':125 'limit':94 'list':58,152 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':124 'materi':180 'metric':118 'micropayment API' 'network':9,24,52 'no-api-key' 'offer':111 'page':196 'paramet':217 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':214 'payment':48,103,157 'per':3,18,36,84,155 'platform':6,21,39,87,110 'post-method' 'premium':60,185 'price':134,193 'prompt':203 'protocol':44 'quot':139 'rate':93,137 'remain':221 'render':198 'report':119 'request':37,68,107,156 'respons':213 'return':64 'say':184 'sentiment':126 'settl':158 'simpli':99,183 'specif':54,168 'summar':129 'text':128 'token':138 'unit':74 'unknown':222 'usdc':15,30,47,76,80,160 'usdc-base' 'use':41 'util':144 'valid':146 'via':10,25 'wallet':202 'web3':133 'without':188 'x402':11,26,43,102 'x402 USDC API' 'x402-payment'","prices":[{"id":"3b2ddcea-cb97-4e2a-ba06-b217e1c52be5","listingId":"679c53da-4cce-4ca8-aecf-451c8faa2e18","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/9","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:28:05.103Z"}],"sources":[{"listingId":"679c53da-4cce-4ca8-aecf-451c8faa2e18","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transfers/9","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:28:05.103Z","lastSeenAt":"2026-04-22T21:31:47.457Z"}],"details":{"listingId":"679c53da-4cce-4ca8-aecf-451c8faa2e18","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transfers/9 \\\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":"Endpoint returns 402 with x402 challenge requesting up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/9"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/transfers/9"},{"claim":"Platform advertises $0.02/request, no API keys, no rate limits, instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, pricing, API, and README pages show only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API functionality with per-request USDC micropayments","Agent-driven workflows that need keyless, on-demand API access settled on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone without a Base-network USDC wallet","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:33.229Z"},"updatedAt":"2026-04-22T21:31:47.457Z"}}