{"id":"3707d265-5374-445f-b9e3-3f4ccf53a232","shortId":"sWs2Ux","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/keys/87` is listed as \"Premium API Access\" and costs up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (`/api/v1/keys/87`) does not clearly map to any of the named categories — it may be a generic premium access key or an unlisted endpoint.\n\nThe x402 challenge was successfully captured, confirming the endpoint is live and accepting POST requests. Payment is settled to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base with a 300-second timeout. No OpenAPI schema, detailed documentation, or example responses were found in the crawl.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","http-post","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","micropayment api","pay per call api","base usdc api","premium api access"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The endpoint path /api/v1/keys/87 does not match any of the named API categories on the landing page — its actual functionality is unknown","No example request or response bodies were found in the crawl","Pricing and /api pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/87","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/keys/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific endpoint /api/v1/keys/87 has no description of what it actually returns. This is effectively a stub 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'/request':19,38,157 '0.02':18,37,79,156 '000':83 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':209 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':212 '20':82 '300':217 '6':89 'accept':201 'access':74,183 'address':208 'advertis':113 'ai':12,31,124 'analysi':128 'analyt':118 'api':5,24,45,73,92 'attach':103 'base':8,27,63,84,214 'base usdc api' 'broad':50 'call':4,23,81 'caller':101 'captur':194 'catalog':51 'categori':116,176 'challeng':191 'classif':131 'clear':169 'commit':98 'confirm':195 'convers':148 'cost':76 'crawl':232 'data':11,30,117,121 'decim':90 'detail':223 'document':224 'embed':132 'enabl':44 'endpoint':16,35,57,67,115,152,162,188,197 'estim':142 'exampl':226 'exchang':137 'export':122 'feed':136 'financ':13,32,133 'found':229 'four':114 'gas':141 'generat':149 'generic':181 'geocod':146 'header':107 'howev':159 'http-post' 'infrastructur':144 'insight':123 'json-response' 'key':93,184 'learn':126 'limit':95 'list':70,151,164 'live':199 'low payment fee' 'lowpaymentfee.com':39 'machin':125 'map':170 'may':178 'metric':119 'micropayment api' 'name':175 'network':64 'offer':10,29 'openapi':221 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':106,204 'per':3,22,55,80 'platform':6,25,46,112 'post':202 'premium':72,182 'premium api access' 'price':135,158 'provid':48 'quot':140 'rate':94,138 'report':120 'request':56,110,203 'requir':100 'respons':227 'schema':222 'second':218 'sentiment':127 'settl':58,206 'share':153 'simpli':102 'specif':66,161 'success':193 'summar':130 'text':129 'timeout':219 'token':139 'unit':85 'unlist':187 'upfront':97 'usdc':9,28,60,87,211 'usdc-base' 'use':210 'util':15,34,145 'valid':147 'web3':134 'x402':43,105,190 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"8fc965ea-ee1d-473c-babc-0cf4734c12d0","listingId":"3707d265-5374-445f-b9e3-3f4ccf53a232","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/keys/87","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:24.028Z"}],"sources":[{"listingId":"3707d265-5374-445f-b9e3-3f4ccf53a232","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/87","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:24.028Z","lastSeenAt":"2026-04-22T01:02:19.504Z"}],"details":{"listingId":"3707d265-5374-445f-b9e3-3f4ccf53a232","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/87 \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/87"},{"claim":"All listed endpoints are priced at $0.02/request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/87"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand API access without managing API keys or subscriptions","Programmatic access to data, AI inference, or utility endpoints with per-call USDC payments","Testing x402 payment flows on Base network"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle USDC payments on Base per request","Prototyping x402 integrations at low cost ($0.02/call)"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:04.895Z"},"updatedAt":"2026-04-22T01:02:19.504Z"}}