{"id":"60da32fa-7a72-408d-add5-da6d8599d99a","shortId":"YT6bpx","kind":"x402","title":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to gate access to a variety of endpoints across data analytics, AI/ML inference, finance/Web3, and utility services. Each call costs $0.02 in USDC on the Base network, with no API keys, rate limits, or subscription commitments required.\n\nThe specific endpoint at `/api/v1/payments/152` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge confirms it is live, requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 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 generation — all at the same $0.02 per request price point. However, documentation pages (docs, pricing, README) returned only a \"Connect wallet\" prompt with no further technical detail, so the actual request/response schemas for this specific endpoint and the others are unknown.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay per call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-gated API","402 payment API"],"warnings":["No API documentation available — docs, pricing, and README pages all return only 'Connect wallet' with no technical content.","The purpose and input/output schema of /api/v1/payments/152 ('Premium API Access') is completely undocumented; it is unclear what this endpoint actually returns.","No OpenAPI spec or request/response examples are provided by the platform."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/152","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/152","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 OpenAPI schema, no documentation beyond a wallet-connect prompt, and no information about what this specific endpoint actually does or what request/response bodies look like. The listing is essentially a stub with confirmed 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'/request':12,28 '0.02':11,27,67,121,167 '000':110 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':132 '0x8335':115 '20':109 '2913':116 '300':135 '402 payment API' '6':125 'Base network API' 'USDC micropayment API' 'accept':96 'access':49,94 'across':55 'actual':191 'address':131 'advertis':141 'ai/ml':58 'analysi':145 'analyt':57 'api':5,14,21,30,40,76,93 'base':8,24,72,111,118 'broader':139 'call':4,20,65 'challeng':101 'classif':148 'commit':82 'confirm':102 'connect':181 'convers':160 'cost':66 'crypto-gated API' 'data':56 'decim':126 'detail':188 'doc':175 'document':173 'embed':149 'endpoint':54,86,142,197 'equal':120 'estim':157 'exchang':152 'feed':151 'finance/web3':60 'gas':156 'gate':48 'generat':162 'geocod':158 'given':122 'howev':172 'infer':59 'json-response' 'key':15,31,77 'limit':79 'list':90 'live':105 'lowpaymentfee' 'lowpaymentfee.com':33 'network':73 'no-api-key' 'other':200 'page':174 'pay':2,18,37 'pay per call API' 'pay-per-cal':1,17 'pay-per-request':36 'payment':127 'per':3,19,38,168 'platform':6,22,41,140 'point':171 'post':97 'post-endpoint' 'premium':92 'price':150,170,176 'prompt':183 'protocol':46 'quot':155 'rate':78,153 'readm':177 'request':39,98,106,169 'request/response':192 'requir':16,32,83 'return':178 'schema':193 'second':136 'sent':129 'sentiment':144 'servic':63 'specif':85,196 'subscript':81 'summar':147 'technic':187 'text':146 'timeout':137 'token':154 'unit':112 'unknown':202 'usdc':69,114,123 'usdc-base' 'use':43 'util':62 'valid':159 'varieti':52 'via':9,25 'wallet':182 'x402':10,26,45,100 'x402 API' 'x402-payment'","prices":[{"id":"528d9fd8-5e36-475d-810a-85d73b84392e","listingId":"60da32fa-7a72-408d-add5-da6d8599d99a","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/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:32.922Z"}],"sources":[{"listingId":"60da32fa-7a72-408d-add5-da6d8599d99a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/152","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:32.922Z","lastSeenAt":"2026-04-23T17:31:47.665Z"}],"details":{"listingId":"60da32fa-7a72-408d-add5-da6d8599d99a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/152 \\\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 on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02.","source_url":"https://lowpaymentfee.com/api/v1/payments/152"},{"claim":"The platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on the Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need frictionless, keyless API access on Base","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Developers without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.526Z"},"updatedAt":"2026-04-23T17:31:47.665Z"}}