{"id":"ec431ce1-e2fe-478a-833b-7b9e3af41389","shortId":"j4VQzD","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/payments/378` 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. No API keys or rate limits are required; callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises multiple API categories including 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\nHowever, this specific endpoint (`/api/v1/payments/378`) has a generic \"Premium API Access\" description with no documentation on what it actually returns. The crawled docs, pricing, and API pages all rendered only a \"Connect wallet\" prompt with no further content. Without schema details, example responses, or documentation, the actual functionality behind this endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment API","crypto API gateway"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet'","The specific functionality of /api/v1/payments/378 is completely undocumented","No OpenAPI schema or example responses provided","No input schema documented; unclear what POST body is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/378","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/378","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 it accepts USDC on Base at $0.02/request. However, there is no documentation, no OpenAPI schema, no example request/response, and the endpoint description is entirely generic ('Premium API Access'). The docs/pricing/API pages all render only 'Connect wallet' with no usable 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'/request':13,28,152 '0.02':12,27,78,151 '000':72 '20':71 '402':66 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,165 'actual':173,201 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,82,108,164,180 'attach':91 'base':8,23,51,73 'behind':203 'broader':104 'call':4,19,80 'caller':89 'categori':109 'challeng':67 'classif':125 'connect':186 'content':192 'convers':142 'crawl':176 'crypto API gateway' 'data':111,115 'descript':166 'detail':195 'doc':177 'document':169,199 'embed':126 'endpoint':55,145,158,205 'estim':136 'exampl':196 'exchang':131 'export':116 'feed':130 'financ':127 'function':202 'gas':135 'generat':143 'generic':162 'geocod':140 'header':96 'howev':155 'http-post' 'i.e':77 'includ':110 'infrastructur':138 'insight':117 'key':83 'learn':120 'limit':86 'list':58,147 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'metric':113 'multipl':107 'network':9,24,52 'no-api-key' 'page':181 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,95,101 'per':3,18,36,79 'platform':6,21,39,105 'point':154 'premium':60,163 'price':129,153,178 'prompt':188 'proof':102 'protocol':44 'quot':134 'rate':85,132 'render':183 'report':114 'request':37,68 'requir':88 'respons':197 'return':64,174 'schema':194 'sentiment':121 'simpli':90 'specif':54,157 'summar':124 'text':123 'token':133 'unclear':207 'unit':74 'usdc':15,30,47,76 'usdc-base' 'use':41 'util':139 'valid':99,141 'via':10,25 'wallet':187 'web3':128 'without':193 'x':94 'x-payment':93 'x402':11,26,43,100 'x402 API' 'x402-payment'","prices":[{"id":"d61a05d5-a2f7-49df-bf64-471969016df2","listingId":"ec431ce1-e2fe-478a-833b-7b9e3af41389","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/378","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:39.856Z"}],"sources":[{"listingId":"ec431ce1-e2fe-478a-833b-7b9e3af41389","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/378","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:39.856Z","lastSeenAt":"2026-04-23T20:32:43.799Z"}],"details":{"listingId":"ec431ce1-e2fe-478a-833b-7b9e3af41389","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/378 \\\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/payments/378"},{"claim":"The platform lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access advertised","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/378"}],"useCases":["Accessing premium API endpoints without traditional API key registration","Making micropayment-gated API calls using USDC on Base","Agent-driven workflows that need instant, keyless API access"],"bestFor":["Developers who want pay-as-you-go API access without subscriptions","AI agents that can settle x402 payments autonomously","Users already holding USDC on the Base network"],"notFor":["Users who need detailed API documentation before integrating","Anyone requiring fiat-only payment methods","High-volume consumers who would benefit from bulk pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.44Z"},"updatedAt":"2026-04-23T20:32:43.799Z"}}