{"id":"bf1bf54d-1f44-4bde-a381-85d41f8a9a30","shortId":"Cg5UHE","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC, 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 at `/api/v1/payments/349` 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, rate limits, or upfront commitments are required — each request is paid for individually via the x402 payment header.\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. However, the specific functionality behind the `/api/v1/payments/349` endpoint is not documented beyond its \"Premium API Access\" label.\n\nPayments settle on the Base L2 network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The x402 challenge specifies a 300-second payment timeout and uses the \"exact\" payment scheme. The endpoint accepts POST requests and returns `application/json` responses.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The specific functionality of /api/v1/payments/349 is undocumented — 'Premium API Access' is the only description available.","Documentation pages (/docs, /api, /pricing, /README) all render only a 'Connect wallet' prompt with no actual content.","No OpenAPI spec, request schema, or response schema is available for this endpoint.","The platform lists many API categories (AI, finance, analytics, etc.) but it is unclear which, if any, are fully implemented behind this endpoint."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/349","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/349","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation of what the endpoint actually does beyond the generic label \"Premium API Access,\" no request/response schema, no examples, and the docs/pricing/API pages all render only a wallet-connect prompt with no useful 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'/request':13,32,161 '0.02':12,31,83,160 '000':77 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':191 '20':76 '300':197 '6':87 'Base network API' 'USDC API access' 'accept':54,209 'access':71,179 'advertis':115 'ai':127 'analysi':131 'analyt':121 'api':5,17,24,36,46,70,92,117,178 'application/json':214 'base':8,27,59,78,185 'behind':168 'beyond':175 'broader':113 'call':4,23,90 'categori':118 'challeng':194 'charg':73 'classif':134 'commit':98 'contract':190 'convers':151 'data':120,124 'decim':88 'document':174 'embed':135 'endpoint':63,154,171,208 'estim':145 'exact':204 'exchang':140 'export':125 'feed':139 'financ':136 'function':167 'gas':144 'generat':152 'geocod':149 'given':84 'header':111 'howev':164 'i.e':82 'includ':119 'individu':106 'infrastructur':147 'insight':126 'json-response' 'key':18,37,93 'l2':186 'label':180 'learn':129 'limit':95 'list':67,156 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':128 'metric':122 'micropayment API' 'multipl':116 'network':9,28,60,187 'no-api-key' 'paid':104 'pay':2,21,43 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':42 'payment':56,110,181,199,205 'per':3,22,44,89 'platform':6,25,47,114 'point':163 'post':210 'post-method' 'premium':69,177 'premium API access' 'price':138,162 'protocol':52 'quot':143 'rate':94,141 'report':123 'request':45,102,211 'requir':19,38,100 'respons':215 'return':213 'scheme':206 'second':198 'sentiment':130 'settl':182 'specif':62,166 'specifi':195 'summar':133 'text':132 'timeout':200 'token':142 'unit':79 'upfront':97 'usdc':15,34,55,81,85,189 'usdc-base-network' 'use':49,188,202 'util':148 'valid':150 'via':10,29,107 'web3':137 'x402':11,30,51,109,193 'x402 API' 'x402-payment'","prices":[{"id":"798c98ca-961c-4112-86b5-2e08749b804a","listingId":"bf1bf54d-1f44-4bde-a381-85d41f8a9a30","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/349","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:25.925Z"}],"sources":[{"listingId":"bf1bf54d-1f44-4bde-a381-85d41f8a9a30","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/349","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:25.925Z","lastSeenAt":"2026-04-23T11:03:34.893Z"}],"details":{"listingId":"bf1bf54d-1f44-4bde-a381-85d41f8a9a30","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/349 \\\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 charges up to 20,000 base units of USDC ($0.02) per request on the Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/349"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/349"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without managing API keys","Testing x402 protocol-based payment flows for API monetization"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously","Projects already operating on the Base L2 network with USDC"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.15Z"},"updatedAt":"2026-04-23T11:03:34.893Z"}}