{"id":"5efb82ae-c964-4f97-9831-b87357f72a3b","shortId":"TnCTjZ","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 at /api/v1/payments/374 is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, subscriptions, 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. However, the specific functionality behind the /api/v1/payments/374 endpoint is not documented beyond its \"Premium API Access\" label, and no request/response schemas are provided for any endpoint.\n\nThe endpoint is live and returns a proper 402 challenge. Payment settles in USDC (contract 0x8335…2913) on Base to address 0x1A2B…85F3 with a 300-second timeout. Documentation pages (/docs, /pricing, /api, /README) all render only a \"Connect wallet\" prompt with no substantive content, so the actual input parameters and response format for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["general","api-gateway"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all render only a 'Connect wallet' prompt with no substantive content.","The specific functionality of /api/v1/payments/374 ('Premium API Access') is completely undocumented; it is unclear what this endpoint actually does.","No request or response schema is provided for any endpoint on the platform.","The platform lists many API categories (AI, finance, data, etc.) but none have visible documentation to verify actual functionality."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/374","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/374","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, but there is zero documentation on what this specific endpoint does, what inputs it accepts, or what it returns. All doc pages render only 'Connect wallet' with no content. The 'Premium API Access' label is generic and 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'/api/v1/payments/374':57,157 '/docs':207 '/pricing':208 '/readme':210 '/request':13,28,148 '0.02':12,27,74,147 '000':68 '0x1a2b':198 '0x8335':192 '20':67 '2913':193 '300':202 '402':185 '85f3':199 'accept':46 'access':62,166 'actual':224 'address':197 'advertis':85,103 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,78,105,165 'attach':88 'base':8,23,51,69,195 'base network api' 'behind':155 'beyond':162 'broader':101 'call':4,19,76 'caller':86 'categori':106 'challeng':186 'charg':64 'classif':121 'connect':215 'content':221 'contract':191 'convers':138 'data':107,111 'document':161,205 'embed':122 'endpoint':55,141,158,176,178,232 'estim':132 'exchang':127 'export':112 'feed':126 'financ':123 'format':229 'function':154 'gas':131 'generat':139 'geocod':136 'header':93 'howev':151 'i.e':73 'infrastructur':134 'input':225 'insight':113 'json-response' 'key':79 'label':59,167 'learn':116 'limit':83 'list':143 'live':180 'low payment fee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'micropayment api' 'multipl':104 'network':9,24,52 'no-api-key' 'page':206 'paramet':226 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,92,98,187 'per':3,18,36,75 'platform':6,21,39,102 'point':150 'premium':60,164 'premium api access' 'price':125,149 'prompt':217 'proof':99 'proper':184 'protocol':44 'provid':173 'quot':130 'rate':82,128 'remain':233 'render':212 'report':110 'request':37 'request/response':170 'respons':228 'return':182 'schema':171 'second':203 'sentiment':117 'settl':188 'simpli':87 'specif':54,153 'subscript':80 'substant':220 'summar':120 'text':119 'timeout':204 'token':129 'unit':70 'unknown':234 'usdc':15,30,47,72,190 'usdc api' 'usdc-base' 'use':41 'util':135 'valid':96,137 'via':10,25 'wallet':216 'web3':124 'x':91 'x-payment':90 'x402':11,26,43,97 'x402 api' 'x402-payment'","prices":[{"id":"0c7af33b-f1cd-4385-bb39-66ec4837d56a","listingId":"5efb82ae-c964-4f97-9831-b87357f72a3b","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/374","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:37.466Z"}],"sources":[{"listingId":"5efb82ae-c964-4f97-9831-b87357f72a3b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/374","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:37.466Z","lastSeenAt":"2026-04-22T07:01:11.158Z"}],"details":{"listingId":"5efb82ae-c964-4f97-9831-b87357f72a3b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/374 \\\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 with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/374"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/374"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a generic pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers exploring x402 protocol integration","Agents that need key-free, pay-as-you-go API access","Low-cost per-request experimentation on Base network"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Production workloads requiring well-documented request/response schemas","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.552Z"},"updatedAt":"2026-04-22T07:01:11.158Z"}}