{"id":"844a5ed5-0b61-48bb-84df-43a48ea99e2a","shortId":"UkndPT","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, paid in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe specific endpoint at `/api/v1/apikeys/6` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02, since USDC uses 6 decimals) on Base. The payment scheme is \"exact\" and settles to a specified wallet address. The broader platform advertises additional 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 per-call price point.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what the \"Premium API Access\" endpoint actually returns. The platform's landing page is the only substantive source of information.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","api-key-generation","data-analytics","ai-inference","finance-data","web3-data","utility-services"],"categories":["api-marketplace","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api access","base network api","micropayment api","402 payment api"],"warnings":["No OpenAPI schema or detailed documentation available","All documentation pages (docs, api, pricing, README) render only 'Connect wallet' with no content","The specific behavior and response format of /api/v1/apikeys/6 is unknown — 'Premium API Access' is the only description","No request or response examples are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/6","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/6","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 402 challenge, but documentation is essentially nonexistent — all doc/pricing/API pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is largely inferred from the landing page and the 402 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'0.02':12,28,63,107,157 '000':101 '20':100 '402':95 '402 payment api' '6':111 'access':91,202 'across':47 'actual':204 'addit':131 'address':126 'advertis':130 'ai':50 'ai-inference' 'analysi':135 'analyt':49 'api':5,21,39,75,90,169,201 'api-key-generation' 'base':9,25,71,102,114 'base network api' 'broader':128 'call':4,20,160 'challeng':96 'classif':138 'commit':80 'connect':178 'content':184 'convers':150 'data':48 'data-analytics' 'decim':112 'descript':196 'detail':195 'doc':168 'document':163 'embed':139 'enabl':38 'endpoint':46,59,84,132,203 'estim':147 'exact':119 'exampl':192 'exchang':142 'extrem':165 'feed':141 'financ':53 'finance-data' 'gas':146 'generat':7,23,152 'geocod':148 'i.e':106 'inform':217 'infrastructur':56 'key':6,22,76 'label':88 'land':209 'learn':52 'limit':78 'low payment fee' 'lowpaymentfee.com':33 'machin':51 'micropayment api' 'network':72 'offer':42 'openapi':188 'page':173,210 'paid':66 'pay':2,18 'pay per call api' 'pay-per-cal':1,17 'pay-per-call' 'payment':116 'per':3,13,19,29,64,159 'per-cal':158 'platform':40,129,207 'point':162 'premium':89,200 'price':61,140,161,170 'prompt':180 'quot':145 'rate':77,143 'readm':172 'render':175 'request':14,30,65,97 'request/response':191 'requir':81 'return':93,205 'schema':189 'scheme':117 'sentiment':134 'settl':121 'sinc':108 'sourc':215 'spars':166 'specif':83 'specifi':124 'substant':214 'summar':137 'text':136 'token':144 'unit':103 'usdc':16,32,68,105,109 'usdc api access' 'usdc-base' 'use':110 'util':57 'utility-services' 'valid':149 'varieti':44 'via':10,26 'wallet':125,179 'web3':54 'web3-data' 'x402':11,27,37 'x402 api' 'x402-enabled':36 'x402-payment'","prices":[{"id":"4c9a8491-2769-4ecd-af6d-b503cedd4062","listingId":"844a5ed5-0b61-48bb-84df-43a48ea99e2a","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:36.192Z"}],"sources":[{"listingId":"844a5ed5-0b61-48bb-84df-43a48ea99e2a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:36.192Z","lastSeenAt":"2026-04-22T10:02:37.554Z"}],"details":{"listingId":"844a5ed5-0b61-48bb-84df-43a48ea99e2a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/6 \\\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":"All endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is in USDC on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC (USD Coin, 6 decimals = $0.02)","source_url":"https://lowpaymentfee.com/api/v1/apikeys/6"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages show only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to analytics, AI, finance, and utility APIs without managing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Prototyping integrations with low-cost, no-commitment API endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume production workloads where per-call pricing may not be cost-effective","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:28.861Z"},"updatedAt":"2026-04-22T10:02:37.554Z"}}