{"id":"81e2eee7-26c9-470f-9600-b31427a557cd","shortId":"KADKeQ","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 a platform offering a suite of pay-per-request APIs settled via the x402 protocol on the Base network using USDC. The specific endpoint at `/api/v1/apikeys/19` is labeled \"Premium API Access\" and accepts POST requests with an x402 payment challenge. The platform advertises a flat $0.02 per request across all its endpoints, with no API keys, no rate limits, and instant access.\n\nThe broader platform lists endpoints spanning four 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per call.\n\nThe x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (contract `0x8335...2913` on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the `exact` scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. Documentation beyond the landing page is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","api-key-generation","post-endpoint"],"categories":["infrastructure","api-management"],"synonyms":["premium API access","x402 API key","low payment fee","micropayment API","USDC API access","Base network API","pay-per-call API"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) are all empty — they only show 'Connect wallet'","No OpenAPI or schema available; request body format and response structure are unknown","The specific function of /api/v1/apikeys/19 ('Premium API Access') is not documented — it is unclear what the response contains or what 'API key' is generated","No examples of successful responses are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/19","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, and the landing page confirms pricing and available API categories. However, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no usable content. The purpose of the specific /apikeys/19 endpoint is unclear beyond its 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'0.02':12,28,81,143,169 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':184 '0x8335':163 '20000':157 '2913':164 '6':173 'Base network API' 'USDC API access' 'accept':68 'access':66,97 'across':84 'addit':209 'address':183 'advertis':78 'ai':113 'analysi':117 'analyt':107 'api':5,21,45,65,90,195 'api-key-generation' 'base':9,25,53,158,166 'beyond':186 'broader':99 'call':4,20,145 'categori':105 'challeng':75,148 'classif':120 'connect':204 'content':210 'contract':162 'convers':136 'data':106,110 'decim':174 'doc':194 'document':185 'embed':121 'endpoint':59,87,102,139,152 'equal':168 'estim':131 'exact':180 'exchang':126 'export':111 'extrem':191 'feed':125 'financ':122 'flat':80 'four':104 'gas':130 'generat':7,23,137 'geocod':134 'given':170 'infrastructur':133 'insight':112 'instant':96 'key':6,22,91 'label':63 'land':188 'learn':115 'limit':94 'list':101 'low payment fee' 'lowpaymentfee.com':33 'machin':114 'made':177 'maxamountrequir':155 'metric':108 'micropayment API' 'network':54 'offer':37 'page':189,199 'pay':2,18,42 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':41 'payment':74,175 'per':3,13,19,29,43,82,144 'platform':36,77,100 'post':69 'post-endpoint' 'premium':64 'premium API access' 'price':124,141,196 'prompt':206 'protocol':50 'quot':129 'rate':93,127 'readm':198 'render':201 'report':109 'request':14,30,44,70,83 'scheme':181 'sentiment':116 'settl':46 'show':153 'span':103 'spars':192 'specif':58,151 'suit':39 'summar':119 'text':118 'token':128 'unit':159 'usdc':16,32,56,161,171 'usdc-base' 'use':55 'valid':135 'via':10,26,47,178 'wallet':205 'web3':123 'x402':11,27,49,73,147 'x402 API key' 'x402-payment'","prices":[{"id":"b4aa13a3-f038-48ff-ae50-92d88b19051f","listingId":"81e2eee7-26c9-470f-9600-b31427a557cd","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/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:33.780Z"}],"sources":[{"listingId":"81e2eee7-26c9-470f-9600-b31427a557cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:33.780Z","lastSeenAt":"2026-04-23T06:31:46.021Z"}],"details":{"listingId":"81e2eee7-26c9-470f-9600-b31427a557cd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/19 \\\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":"Flat pricing of $0.02 per request across all endpoints","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/19"},{"claim":"USDC contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/apikeys/19"},{"claim":"Platform lists endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Purchasing API access keys via micropayment without traditional subscription","Programmatic agent-driven API key provisioning using x402 payments","Accessing a suite of data, AI, finance, and utility endpoints at $0.02 per call"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer crypto-native micropayments over API key management"],"notFor":["Users needing detailed API documentation or OpenAPI specs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.037Z"},"updatedAt":"2026-04-23T06:31:46.021Z"}}