{"id":"7ebc76a9-58eb-4ff9-9cd8-12e2e5865ded","shortId":"STsFNW","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC, no API keys required.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept per-call payments in USDC on the Base network. The specific endpoint `/api/v1/products/75` is listed as \"Premium API Access\" and returns an x402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys, rate limits, or subscriptions 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. However, the specific endpoint being listed here (`/api/v1/products/75`) is labeled generically as \"Premium API Access\" and does not appear in the site's public catalog of named endpoints, so its exact functionality is unclear.\n\nThe endpoint accepts POST requests, returns `application/json`, and settles payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base. The x402 challenge specifies a 300-second payment timeout. Documentation pages beyond the landing page were largely empty (showing only \"Connect wallet\"), so detailed request/response schemas are unavailable.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-marketplace","crypto"],"synonyms":["x402 API","pay per call API","USDC API","Base network API","micropayment API","lowpaymentfee","premium API access"],"warnings":["The endpoint /api/v1/products/75 is not listed in the site's public API catalog — its specific functionality is unknown.","Documentation pages (/docs, /api, /pricing, /README) returned no meaningful content beyond 'Connect wallet'.","No request body schema or response schema is available; callers must discover behavior empirically.","The platform appears to be a generic multi-category API marketplace; individual endpoint quality and data sources are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/products/75","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but the specific functionality of /api/v1/products/75 is undocumented. No request/response schema, no examples, and docs pages are empty. The endpoint doesn't appear in the site's own catalog, making its purpose 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'/call':13,32 '/request':165 '0.02':12,31,90,164 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':214 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':217 '20':83 '300':225 'Base network API' 'USDC API' 'accept':54,204 'access':74,182 'address':213 'advertis':119 'ai':131 'analysi':135 'analyt':125 'api':5,17,24,36,46,73,94,121,181 'appear':186 'application/json':208 'attach':104 'base':8,27,63,85,219 'beyond':231 'broader':117 'call':57 'caller':102 'catalog':192 'categori':122 'challeng':79,222 'classif':138 'connect':240 'convers':155 'data':124,128 'detail':243 'document':229 'embed':139 'empti':237 'endpoint':67,158,171,195,203 'estim':149 'exact':198 'exchang':144 'export':129 'feed':143 'financ':140 'function':199 'gas':148 'generat':156 'generic':178 'geocod':153 'header':109 'howev':168 'i.e':89 'includ':123 'infrastructur':151 'insight':130 'json-response' 'key':18,37,95 'label':177 'land':233 'larg':236 'learn':133 'limit':97 'list':70,160,173 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':132 'metric':126 'micropayment API' 'multipl':120 'name':194 'network':9,28,64 'no-api-key' 'page':230,234 'pay':2,21,43 'pay per call API' 'pay-per-request':1,20,42 'payment':58,108,114,211,227 'per':3,22,44,56,91 'per-cal':55 'platform':6,25,47,118 'point':167 'post':205 'post-method' 'premium':72,180 'premium API access' 'price':142,166 'proof':115 'protocol':52 'public':191 'quot':147 'rate':96,145 'report':127 'request':4,23,45,80,92,206 'request/response':244 'requir':19,38,101 'return':76,207 'schema':245 'second':226 'sentiment':134 'settl':210 'show':238 'simpli':103 'site':189 'specif':66,170 'specifi':223 'subscript':99 'summar':137 'text':136 'timeout':228 'token':146 'unavail':247 'unclear':201 'unit':86 'usdc':15,34,60,88,216 'usdc-base' 'use':49,215 'util':152 'valid':112,154 'via':10,29 'wallet':241 'web3':141 'x':107 'x-payment':106 'x402':11,30,51,78,113,221 'x402 API' 'x402-payment'","prices":[{"id":"2ac30cfc-5801-4c70-89be-e5b885ba1cff","listingId":"7ebc76a9-58eb-4ff9-9cd8-12e2e5865ded","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/75","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:34:44.312Z"}],"sources":[{"listingId":"7ebc76a9-58eb-4ff9-9cd8-12e2e5865ded","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/products/75","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:34:44.312Z","lastSeenAt":"2026-04-23T19:00:36.215Z"}],"details":{"listingId":"7ebc76a9-58eb-4ff9-9cd8-12e2e5865ded","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/products/75 \\\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 x402 challenge requests maxAmountRequired of 20000 base units of USDC on Base (=$0.02)","source_url":"https://lowpaymentfee.com/api/v1/products/75"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/products/75"},{"claim":"Payment timeout is 300 seconds","source_url":"https://lowpaymentfee.com/api/v1/products/75"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to a multi-category API platform"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-27T17:21:08.751Z"},"updatedAt":"2026-04-23T19:00:36.215Z"}}