{"id":"d5d1b5c1-b49f-4a62-b9c4-0400807c491e","shortId":"N4JN54","kind":"x402","title":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call API key generation on Base via x402 — $0.02 per request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/apikeys/20` is described as \"Premium API Access.\" Based on the x402 challenge, it accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is settled on-chain to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme 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 price point. However, documentation is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail, schemas, or usage examples. Without request/response schemas or sample payloads, it is unclear what inputs these endpoints expect or what outputs they return.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-generation","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-quotes","geocoding","utility-services"],"categories":["api-marketplace","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","crypto api gateway"],"warnings":["No OpenAPI or request/response schema available — input/output formats are unknown","All documentation pages (docs, API, pricing, README) return only 'Connect wallet' with no usable content","The exact purpose and response format of /api/v1/apikeys/20 is unclear from available material","No examples or sample payloads are documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/20","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/apikeys/20","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 USDC on Base), but there is no OpenAPI schema, no request/response documentation, and all doc pages render only 'Connect wallet'. The purpose of the specific /apikeys/20 endpoint is ambiguous. Effectively a stub 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'0.02':12,28,63,118,170 '000':107 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':131 '0x8335':112 '20':106 '2913':113 '300':138 '6':122 'accept':99 'access':92 'across':47 'advertis':144 'ai':50 'ai-inference' 'analysi':148 'analyt':49 'api':5,21,39,75,91,180 'api-key-generation' 'base':9,25,71,93,108,115 'base network api' 'broader':142 'call':4,20 'chain':129 'challeng':97 'charg':103 'classif':151 'classification' 'commit':80 'connect':189 'convers':163 'crypto api gateway' 'crypto-quotes' 'data':48 'data-analytics' 'decim':123 'describ':88 'detail':196 'doc':179 'document':174 'embed':152 'embeddings' 'enabl':38 'endpoint':46,59,84,145,213 'equal':117 'estim':160 'exact':134 'exampl':200 'exchang':155 'expect':214 'extrem':176 'feed':154 'financ':53 'finance-data' 'gas':159 'generat':7,23,165 'geocod':161 'geocoding' 'given':119 'howev':173 'infrastructur':56 'input':211 'key':6,22,76 'learn':52 'limit':78 'low payment fee' 'lowpaymentfee.com':33 'machin':51 'micropayment api' 'network':72 'offer':42 'on-chain':127 'output':217 'page':184 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-request' 'payabl':66 'payload':206 'payment':124 'per':3,13,19,29,64 'platform':40,143 'point':172 'post':100 'premium':90 'price':61,153,171,181 'prompt':191 'quot':158 'rate':77,156 'readm':183 'render':186 'request':14,30,65,101 'request/response':202 'requir':81 'return':219 'sampl':205 'schema':197,203 'scheme':135 'second':139 'sentiment':147 'sentiment-analysis' 'settl':126 'specif':83 'summar':150 'technic':195 'text':149 'text-summarization' 'thin':177 'timeout':140 'token':157 'unclear':209 'unit':109 'usag':199 'usdc':16,32,68,111,120 'usdc api access' 'usdc-base' 'use':132 'util':57 'utility-services' 'valid':162 'varieti':44 'via':10,26 'wallet':190 'web3':54 'without':201 'x402':11,27,37,96 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"7fa18113-adc2-4f51-9b9f-04bf62adbb34","listingId":"d5d1b5c1-b49f-4a62-b9c4-0400807c491e","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/apikeys/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:22.308Z"}],"sources":[{"listingId":"d5d1b5c1-b49f-4a62-b9c4-0400807c491e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:22.308Z","lastSeenAt":"2026-04-22T12:04:51.198Z"}],"details":{"listingId":"d5d1b5c1-b49f-4a62-b9c4-0400807c491e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/20 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/20"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Generating API keys for premium access via a single micropayment","Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time crypto quotes, gas estimates, and exchange rates on a per-call basis","Geocoding and data validation as utility microservices","Exporting data or retrieving analytics metrics with no upfront commitment"],"bestFor":["Developers who want pay-per-use API access without API key management","Agents and bots that can settle USDC payments on Base automatically","Projects needing low-cost, no-commitment access to diverse utility endpoints"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-throughput applications that need bulk pricing or SLAs","Users without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.548Z"},"updatedAt":"2026-04-22T12:04:51.198Z"}}