{"id":"e06e695f-212c-472b-9dbe-4a61805dab58","shortId":"d8NRMk","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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/payments/229` is listed as \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API 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. Payments settle to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nNote that the specific endpoint probed (`/api/v1/payments/229`) does not clearly map to any of the documented API categories on the landing page. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content, so the actual request/response schemas for this endpoint are unknown. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation or example payloads, the exact functionality behind \"Premium API Access\" remains unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee"],"warnings":["Documentation pages (/docs, /pricing, /README) contain no substantive content — only a 'Connect wallet' prompt.","The endpoint path /api/v1/payments/229 does not correspond to any of the API categories listed on the landing page; its actual functionality is unknown.","No request or response schema is available; callers cannot determine what data to send or expect back.","The platform lists many API categories (AI, analytics, finance, etc.) but provides no documentation for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/229","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/payments/229","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge, but documentation pages are empty (only 'Connect wallet' prompts). No request/response schema, no examples, and the endpoint path '/api/v1/payments/229' doesn't match any documented API category. Effectively a stub 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'/docs':194 '/pricing':195 '/readme':196 '/request':13,30,157 '0.02':12,29,78,156 '000':72 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':167 '20':71 '402':225 '6':82 'Base network API' 'USDC API' 'accept':50 'access':66,240 'account':89 'actual':209 'address':163 'advertis':94,112 'ai':123 'analysi':127 'analyt':117 'api':5,15,22,32,42,65,87,114,186,239 'attach':97 'base':8,25,55,73,169 'behind':237 'broader':110 'call':4,21,85 'caller':95 'categori':115,187 'challeng':227 'charg':68 'classif':130 'clear':179 'confirm':220 'connect':200 'content':206 'convers':147 'data':116,120 'decim':83 'document':185,192,230 'embed':131 'endpoint':59,150,174,214,218 'estim':141 'exact':235 'exampl':232 'exchang':136 'export':121 'feed':135 'financ':132 'function':236 'gas':140 'generat':148 'geocod':145 'given':79 'header':102 'i.e':77 'infrastructur':143 'insight':122 'json-response' 'key':16,33,88 'land':190 'learn':125 'limit':92 'list':62,152 'live':221 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':124 'map':180 'metric':118 'micropayment API' 'multipl':113 'network':56 'no-api-key' 'note':170 'page':191,193 'pay':2,19,39 'pay per call API' 'pay-per-cal':1,18 'pay-per-request':38 'payload':233 'payment':52,101,107,160 'per':3,20,40,84 'platform':6,23,43,111 'point':159 'post-method' 'premium':64,238 'price':134,158 'probe':175 'prompt':202 'proof':108 'proper':224 'protocol':48 'quot':139 'rate':91,137 'remain':241 'report':119 'request':41 'request/response':210 'requir':17,34 'return':197,222 'schema':211 'sentiment':126 'settl':161 'simpli':96 'specif':58,173 'substant':205 'summar':129 'text':128 'token':138 'unclear':242 'unit':74 'unknown':216 'usdc':9,26,51,76,80,166 'usdc-base' 'use':45,165 'util':144 'valid':105,146 'via':10,27 'wallet':201 'web3':133 'without':229 'x':100 'x-payment':99 'x402':11,28,47,106,226 'x402 API' 'x402-payment'","prices":[{"id":"0879dc74-ad2b-4b91-8c6e-5ec1ce637d82","listingId":"e06e695f-212c-472b-9dbe-4a61805dab58","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/payments/229","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:57.184Z"}],"sources":[{"listingId":"e06e695f-212c-472b-9dbe-4a61805dab58","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/229","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:57.184Z","lastSeenAt":"2026-04-24T04:03:49.213Z"}],"details":{"listingId":"e06e695f-212c-472b-9dbe-4a61805dab58","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/229 \\\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":"Endpoint returns a valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/229"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/229"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Multiple API categories listed: Data & Analytics, AI & ML, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without account registration or API keys","Agent-driven workflows that need to pay per call using on-chain USDC on Base","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request API consumption on Base L2"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-throughput use cases where $0.02/request adds up significantly","Anyone needing non-USDC or non-Base payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.479Z"},"updatedAt":"2026-04-24T04:03:49.213Z"}}