{"id":"d6d4eabe-1bf9-4eec-ab11-bc38f26b5177","shortId":"cZ9zzL","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/228` 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 lowpaymentfee.com site offers 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 $0.02 per request. However, the specific endpoint being listed here (`/api/v1/transactions/228`) does not clearly map to any of those named categories — it sits under a `/transactions/` path and is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint returns. The endpoint is confirmed live (402 challenge captured), but the actual functionality behind the paywall is unknown.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The endpoint path /api/v1/transactions/228 does not match any of the named API categories on the homepage; its actual functionality is unknown","No OpenAPI spec or response schema provided","No examples of request body or response payload available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/228","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/228","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, but there is zero documentation on what the endpoint actually does or returns. No OpenAPI spec, no request/response examples, and the docs pages are empty. The 'Premium API Access' label is completely generic. Functionality behind the paywall is 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'/api/v1/transactions/228':56,164 '/docs':205 '/pricing':207 '/readme':209 '/request':13,28 '/transactions':179 '0.02':12,27,78,154 '000':72 '20':71 '402':66,245 '6':82 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,97,188 'actual':250 'advertis':88 'ai':123 'analysi':127 'analyt':117 'api':5,20,38,61,90,114,187 'attach':100 'base':8,23,51,73 'behind':252 'broader':109 'call':4,19,85 'captur':247 'categori':115,174 'challeng':67,246 'classif':130 'clear':167 'confirm':243 'connect':215 'content':221 'convers':147 'crypto-paid API' 'data':116,120,195 'decim':83 'describ':183 'document':192,200,230 'embed':131 'endpoint':55,150,160,238,241 'estim':141 'exampl':233 'exchang':136 'export':121 'extrem':202 'feed':135 'financ':132 'function':197,251 'gas':140 'generat':148 'geocod':145 'given':79 'header':104 'howev':157 'i.e':77 'infrastructur':143 'insight':122 'instant':96 'json-response' 'key':91 'learn':125 'limit':94 'list':58,152,162 'live':244 'lowpaymentfee' 'lowpaymentfee.com':31,110 'machin':124 'map':168 'metric':118 'multipl':113 'name':173 'network':9,24,52 'no-api-key' 'offer':112 'openapi':225 'page':210 'particular':237 'path':180 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,103 'paywal':254 'per':3,18,36,84,155 'platform':6,21,39,87 'premium':60,186 'premium API access' 'price':134 'prompt':217 'protocol':44 'quot':139 'rate':93,137 'render':212 'report':119 'request':37,68,107,156 'request/response':228 'return':64,199,239 'schema':229 'sentiment':126 'simpli':99 'sit':176 'site':111 'spars':203 'spec':226 'specif':54,159 'substant':220 'summar':129 'text':128 'token':138 'unit':74 'unknown':256 'usdc':15,30,47,76,80 'usdc-base-network' 'use':41 'util':144 'valid':146 'via':10,25 'wallet':216 'web3':133 'x402':11,26,43,102 'x402 API' 'x402-payment'","prices":[{"id":"a87d58f2-7ba7-45e1-953c-6f69a93818fe","listingId":"d6d4eabe-1bf9-4eec-ab11-bc38f26b5177","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/228","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:22.882Z"}],"sources":[{"listingId":"d6d4eabe-1bf9-4eec-ab11-bc38f26b5177","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/228","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:22.882Z","lastSeenAt":"2026-04-23T17:32:16.238Z"}],"details":{"listingId":"d6d4eabe-1bf9-4eec-ab11-bc38f26b5177","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/transactions/228 \\\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 (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/228"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium data or services with per-request USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Testing x402 protocol payment flows on Base network"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-per-call API access on Base","Users who want to avoid subscription commitments for occasional API calls"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-request pricing may add up vs. subscription plans","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:41.391Z"},"updatedAt":"2026-04-23T17:32:16.238Z"}}