{"id":"91d35059-6a13-4fec-ad51-5f4eb606fd8c","shortId":"X6jcMY","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 at `/api/v1/keys/32` 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 subscriptions are required — each request is paid individually via the x402 payment protocol.\n\nThe platform advertises four categories of APIs: 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. The x402 challenge for this endpoint was successfully captured, confirming it is live and accepting payments to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base.\n\nNote that while the landing page lists many endpoints, the specific functionality behind `/api/v1/keys/32` (\"Premium API Access\") is not clearly documented — it may serve as a key-generation or access-provisioning endpoint. No OpenAPI schema, request/response examples, or detailed documentation were found for any of the endpoints.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 API","pay per call API","USDC API","Base network API","micropayment API","serverless API","crypto-paid API"],"warnings":["No OpenAPI or schema documentation available for any endpoint","The specific purpose of /api/v1/keys/32 ('Premium API Access') is unclear — it may be a key provisioning endpoint rather than a data endpoint","No request or response examples found anywhere in crawled content","Pricing and /api pages returned only 'Connect wallet' with no useful content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/32","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/32","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), but there is no OpenAPI schema, no request/response examples, and no documentation for what /api/v1/keys/32 actually returns. The crawled pages beyond the landing page were empty (wallet-connect prompts only). This is effectively a stub 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'/request':19,38,158 '0.02':18,37,80,157 '000':84 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':178 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':181 '20':83 '6':90 'Base network API' 'USDC API' 'accept':174 'access':75,200,215 'access-provis':214 'address':177 'advertis':113 'ai':12,31,125 'ai-inference' 'analysi':129 'analyt':119 'api':5,24,45,74,93,117,199 'base':8,27,63,85,183 'base-network' 'behind':196 'broad':50 'call':4,23,82 'captur':168 'catalog':51 'categori':115 'challeng':162 'classif':132 'clear':203 'confirm':169 'convers':149 'cost':77 'crypto-paid API' 'data':11,30,118,122 'data-analytics' 'decim':91 'detail':224 'document':204,225 'embed':133 'embeddings' 'enabl':44 'endpoint':16,35,57,67,153,165,192,217,232 'estim':143 'exampl':222 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'finance-data' 'found':227 'four':114 'function':195 'gas':142 'generat':150,212 'geocod':147 'geocoding' 'individu':105 'infrastructur':145 'insight':124 'key':94,211 'key-gener':210 'land':188 'learn':127 'limit':96 'list':71,152,190 'live':172 'low payment fee' 'lowpaymentfee.com':39 'machin':126 'mani':191 'may':206 'metric':120 'micropayment API' 'network':64 'no-api-key' 'note':184 'offer':10,29 'openapi':219 'page':189 'paid':104 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':109,175 'per':3,22,55,81 'platform':6,25,46,112 'premium':73,198 'price':136,159 'protocol':110 'provid':48 'provis':216 'quot':141 'rate':95,139 'report':121 'request':56,102 'request/response':221 'requir':100 'schema':220 'sentiment':128 'sentiment-analysis' 'serv':207 'serverless API' 'settl':58 'share':154 'specif':66,194 'subscript':98 'success':167 'summar':131 'text':130 'text-summarization' 'token':140 'unit':86 'usdc':9,28,60,88,180 'usdc-settlement' 'use':179 'util':15,34,146 'utility-apis' 'valid':148 'via':106 'web3':135 'x402':43,108,161 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"eb5d4797-44dc-42c0-afc0-137bd4050a45","listingId":"91d35059-6a13-4fec-ad51-5f4eb606fd8c","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/32","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.192Z"}],"sources":[{"listingId":"91d35059-6a13-4fec-ad51-5f4eb606fd8c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/32","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.192Z","lastSeenAt":"2026-04-22T01:02:18.382Z"}],"details":{"listingId":"91d35059-6a13-4fec-ad51-5f4eb606fd8c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/32 \\\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 with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/32"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/32"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscription","Fetching real-time financial data like token prices, exchange rates, and gas estimates on a per-call basis","Running data analytics queries and exporting reports with no upfront commitment","Using utility services like geocoding, validation, and conversion paid per request"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions","Crypto-native applications already operating on the Base network with USDC"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed SLAs, uptime guarantees, or enterprise support","Developers who require comprehensive API documentation and typed schemas before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:06.161Z"},"updatedAt":"2026-04-22T01:02:18.382Z"}}