{"id":"8583a0c4-3993-44db-9a88-a0d62ef0f19b","shortId":"qBvFMG","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 an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories. All endpoints are priced at $0.02 per request, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/charges/325` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per call, consistent with the site's advertised pricing. Payment is made via the x402 exact scheme with a 300-second timeout.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation. However, documentation pages (docs, pricing, API, README) all returned minimal content (just \"Connect wallet\"), so the actual functionality behind each endpoint is unverified. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["general","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","premium api access"],"warnings":["All documentation pages (docs, pricing, API, README) returned only 'Connect wallet' with no actual content","No OpenAPI or schema available — request format and response structure are unknown","The specific endpoint /api/v1/charges/325 is not listed among the site's advertised API catalog, making its purpose unclear","Functionality behind advertised endpoints (AI, finance, etc.) is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/325","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/charges/325","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, and the landing page lists many endpoints at $0.02 each. However, all documentation pages are empty stubs ('Connect wallet'), there is no OpenAPI schema, no request/response examples, and the actual functionality behind 'Premium API Access' at /api/v1/charges/325 is completely 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'/request':13,28 '0.02':12,27,62,118 '000':101 '0x8335':106 '20':100 '2913':107 '300':138 '402':95 '6':113 'access':91 'across':45 'actual':183 'advertis':126,144 'ai':48 'analysi':148 'analyt':47 'api':5,20,37,74,90,172 'base':8,23,70,102,109 'base network api' 'behind':185 'broader':142 'call':4,19,120 'categori':56 'challeng':96 'classif':151 'commit':79 'connect':179 'consist':121 'content':177 'convers':163 'crawl':202 'data':46,165 'decim':114 'detail':196 'doc':170 'document':168,197 'embed':152 'enabl':36 'endpoint':44,58,83,145,187 'estim':160 'exact':134 'exampl':194 'exchang':155 'feed':154 'financ':51 'found':199 'function':184 'gas':159 'generat':166 'geocod':161 'howev':167 'http-post' 'infrastructur':54 'json-response' 'key':75 'learn':50 'limit':77 'list':87 'low payment fee' 'lowpaymentfee.com':31 'machin':49 'made':130 'micropayment api' 'minim':176 'network':9,24,71 'no-api-key' 'offer':40 'openapi':191 'page':169 'paid':65 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':128 'per':3,18,63,119 'platform':6,21,38,143 'premium':89 'premium api access' 'price':60,127,153,171 'quot':158 'rate':76,156 'readm':173 'request':64,97 'request/response':193 'requir':80 'return':93,175 'schema':192 'scheme':135 'second':139 'sentiment':147 'sinc':110 'site':124 'specif':82 'summar':150 'text':149 'timeout':140 'token':157 'translat':116 'unit':103 'unverifi':189 'usdc':15,30,67,105,111 'usdc api' 'usdc-base-network' 'use':112 'util':55 'valid':162 'varieti':42 'via':10,25,131 'wallet':180 'web3':52 'x402':11,26,35,133 'x402 api' 'x402-enabled':34 'x402-payment'","prices":[{"id":"cd79bf1c-648c-44f4-a6aa-400055082e82","listingId":"8583a0c4-3993-44db-9a88-a0d62ef0f19b","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/charges/325","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:09.033Z"}],"sources":[{"listingId":"8583a0c4-3993-44db-9a88-a0d62ef0f19b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/325","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:09.033Z","lastSeenAt":"2026-04-22T08:31:05.929Z"}],"details":{"listingId":"8583a0c4-3993-44db-9a88-a0d62ef0f19b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/325 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"USDC on Base network (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) with maxAmountRequired of 20000 base units ($0.02)","source_url":"https://lowpaymentfee.com/api/v1/charges/325"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without pre-registration or API keys","Programmatic access to utility endpoints (geocoding, validation, conversion) with micropayments","Testing x402 payment flows on Base network"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Low-volume or sporadic API consumers who want no commitments"],"notFor":["High-volume production workloads needing guaranteed SLAs and detailed documentation","Users without a Base-network USDC wallet","Anyone needing well-documented, schema-validated API contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.393Z"},"updatedAt":"2026-04-22T08:31:05.929Z"}}