{"id":"bb6771f3-85b2-4ed8-ab5c-bc059805e4e5","shortId":"bJ6FNy","kind":"x402","title":"Pay-per-call product data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call product data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"lowpaymentfee.com hosts a collection of x402-gated API endpoints spanning data & analytics, AI/ML inference, finance/Web3, and infrastructure utilities. The specific endpoint at `/api/v1/products/1` is labeled \"Premium API Access\" and returns JSON product data upon payment. It uses the x402 exact payment scheme on the Base network, accepting USDC (contract 0x8335…2913) with a maximum charge of 20,000 base units — which equals $0.02 per request (USDC uses 6 decimals). No API keys or rate limits are advertised; access is granted purely through per-call micropayment.\n\nThe endpoint responds to POST requests and is confirmed live (HTTP 402 challenge captured). The broader platform lists roughly 16 endpoints across categories like sentiment analysis, text summarization, embeddings, price feeds, gas estimates, geocoding, and more — all at the same $0.02/request price point. Documentation pages exist at /docs, /pricing, and /api but currently render only a \"Connect wallet\" prompt with no substantive technical documentation, so the actual request/response schemas for this endpoint are unknown beyond the x402 challenge metadata.\n\nBecause there is no OpenAPI spec, no request body schema, and no example responses available, the exact data returned by `/api/v1/products/1` cannot be confirmed. The endpoint is live and the payment mechanics are clear, but consumers should be aware that documentation is effectively absent.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","per-call-pricing","json-response","no-api-key","post-method"],"categories":["data","commerce"],"synonyms":["product API","premium API access","x402 product endpoint","micropayment API","pay-per-call API","lowpaymentfee","USDC API","Base network API"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","The exact nature of the data returned by /api/v1/products/1 is unverified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/1","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/products/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.400","qualityRationale":"The endpoint is confirmed live with a valid x402 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no OpenAPI spec, no documented request body schema, no example responses, and the docs/pricing/API pages all render only 'Connect wallet' with no content. The actual data returned is 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'/api/v1/products/1':58,222 '/docs':170 '/pricing':171 '/request':17,34,163 '0.02':16,33,98,162 '000':93 '0x8335':85 '16':141 '20':92 '2913':86 '402':133 '6':103 'Base network API' 'USDC API' 'absent':245 'accept':82 'access':63,113 'across':143 'actual':189 'advertis':112 'ai/ml':48 'analysi':147 'analyt':47 'api':43,62,106 'avail':216 'awar':240 'base':9,26,80,94 'base-network' 'beyond':197 'bodi':210 'broader':137 'call':4,21,120 'cannot':223 'captur':135 'categori':144 'challeng':134,200 'charg':90 'clear':235 'collect':38 'confirm':130,225 'connect':179 'consum':237 'contract':84 'current':175 'data':6,23,46,68,219 'decim':104 'document':166,186,242 'effect':244 'embed':150 'endpoint':7,24,44,56,123,142,194,227 'equal':97 'estim':154 'exact':75,218 'exampl':214 'exist':168 'feed':152 'finance/web3':50 'gas':153 'gate':42 'geocod':155 'grant':115 'host':36 'http':132 'infer':49 'infrastructur':52 'json':66 'json-response' 'key':107 'label':60 'like':145 'limit':110 'list':139 'live':131,229 'lowpaymentfee' 'lowpaymentfee.com':35 'maximum':89 'mechan':233 'metadata':201 'micropay':121 'micropayment API' 'network':81 'no-api-key' 'openapi':206 'page':167 'pay':2,19 'pay-per-cal':1,18 'pay-per-call API' 'payment':70,76,232 'per':3,20,99,119 'per-cal':118 'per-call-pricing' 'platform':138 'point':165 'post':126 'post-method' 'premium':61 'premium API access' 'price':151,164 'product':5,22,67 'product API' 'prompt':181 'pure':116 'rate':109 'render':176 'request':100,127,209 'request/response':190 'respond':124 'respons':215 'return':65,220 'rough':140 'schema':191,211 'scheme':77 'sentiment':146 'settl':12,29 'span':45 'spec':207 'specif':55 'substant':184 'summar':149 'technic':185 'text':148 'unit':95 'unknown':196 'upon':69 'usdc':14,31,83,101 'usdc-micropayment' 'use':72,102 'util':53 'via':10,27 'wallet':180 'x402':11,28,41,74,199 'x402 product endpoint' 'x402-gated':40 'x402-payment'","prices":[{"id":"15bedea1-cb3f-426e-bf9e-a07dd1865e4e","listingId":"bb6771f3-85b2-4ed8-ab5c-bc059805e4e5","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/products/1","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:19.731Z"}],"sources":[{"listingId":"bb6771f3-85b2-4ed8-ab5c-bc059805e4e5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/1","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:19.731Z","lastSeenAt":"2026-04-22T21:30:23.957Z"}],"details":{"listingId":"bb6771f3-85b2-4ed8-ab5c-bc059805e4e5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/1 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge accepting USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/products/1"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/products/1"},{"claim":"Platform advertises $0.02/request pricing 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/products/1"},{"claim":"Documentation pages render only 'Connect wallet' with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Retrieving product data on-demand with per-call USDC micropayments","Integrating pay-as-you-go API access into agent workflows without managing API keys","Demonstrating x402 payment protocol integration on Base"],"bestFor":["Developers exploring x402 micropayment-gated APIs","Agents that need keyless, pay-per-call data access on Base","Prototyping crypto-native API payment flows"],"notFor":["Production workloads requiring documented request/response schemas","High-volume use cases where per-call pricing may add up versus subscription models","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T18:01:42.384Z"},"updatedAt":"2026-04-22T21:30:23.957Z"}}