{"id":"cba10a41-ccef-4943-ad58-3e0c3f01dbdc","shortId":"BjjTfe","kind":"x402","title":"Pay-per-call user data API on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call user data API on Base via x402, settled in USDC at $0.02/request.","description":"The `/api/v1/users/all` endpoint on lowpaymentfee.com is an x402-enabled API that returns user data in JSON format. It accepts POST requests and requires payment via the x402 protocol, settling in USDC on the Base network. The price per call is $0.02 (20,000 base units of USDC with 6 decimals).\n\nlowpaymentfee.com hosts a broader suite of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints share the same $0.02/request pricing model with no API keys, no rate limits, and no minimum commitments.\n\nThe specific `/api/v1/users/all` endpoint is labeled \"Premium API Access\" but lacks detailed documentation about what user data it returns, what input parameters it accepts, or what the response schema looks like. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. Without OpenAPI specs or example responses, the exact capabilities of this endpoint remain unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-call","json-response","no-api-key","user-data"],"categories":["data"],"synonyms":["users API","user list endpoint","premium API access","x402 user data","pay-per-request API","lowpaymentfee","Base USDC API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","Docs, pricing, and API pages render only 'Connect wallet' with no substantive content","The exact data returned by /api/v1/users/all is undocumented — 'Premium API Access' is vague","No example request or response bodies are available anywhere in the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/users/all","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/users/all","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no documented request/response format, no examples, and the docs pages are empty beyond a wallet-connect prompt. The purpose of the 'users/all' endpoint is not explained 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'/request':17,34,131 '0.02':16,33,76,130 '000':78 '20':77 '6':84 'Base USDC API' 'accept':54,168 'access':153 'addit':194 'ai':100 'analysi':104 'analyt':99 'api':7,24,45,96,136,152,180 'base':9,26,69,79 'base-network' 'broader':89 'call':4,21,74,95 'capabl':204 'classif':106 'commit':144 'connect':189 'content':195 'convers':123 'data':6,23,49,98,161 'decim':85 'detail':156 'doc':177 'document':157 'embed':107 'enabl':44 'endpoint':37,126,148,207 'estim':117 'exact':203 'exampl':200 'exchang':112 'feed':111 'financ':108 'format':52 'gas':116 'generat':124 'geocod':121 'host':87 'infrastructur':119 'input':165 'json':51 'json-response' 'key':137 'label':150 'lack':155 'learn':102 'like':175 'limit':140 'look':174 'lowpaymentfee' 'lowpaymentfee.com':39,86 'machin':101 'minimum':143 'model':133 'network':70 'no-api-key' 'openapi':197 'page':181 'paramet':166 'pay':2,19,93 'pay-per-cal':1,18,92 'pay-per-call' 'pay-per-request API' 'payment':59 'per':3,20,73,94 'post':55 'premium':151 'premium API access' 'price':72,110,132,178 'prompt':191 'protocol':63 'quot':115 'rate':113,139 'remain':208 'render':186 'request':56 'requir':58 'respons':172,201 'return':47,163 'schema':173 'sentiment':103 'settl':12,29,64 'share':127 'site':184 'span':97 'spec':198 'specif':146 'suit':90 'summar':105 'token':114 'unclear':209 'unit':80 'usdc':14,31,66,82 'usdc-settlement' 'user':5,22,48,160 'user list endpoint' 'user-data' 'users API' 'util':120 'valid':122 'via':10,27,60 'wallet':190 'web3':109 'without':196 'x402':11,28,43,62 'x402 user data' 'x402-enabled':42 'x402-payment'","prices":[{"id":"fa00cfd2-e48f-4d5e-a3ca-6bdaecbf8d42","listingId":"cba10a41-ccef-4943-ad58-3e0c3f01dbdc","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/users/all","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:40.517Z"}],"sources":[{"listingId":"cba10a41-ccef-4943-ad58-3e0c3f01dbdc","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/users/all","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:40.517Z","lastSeenAt":"2026-04-29T07:34:03.807Z"}],"details":{"listingId":"cba10a41-ccef-4943-ad58-3e0c3f01dbdc","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/users/all \\\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":"The endpoint returns HTTP 402 with an x402 challenge requiring USDC payment on Base","source_url":"https://lowpaymentfee.com/api/v1/users/all"},{"claim":"maxAmountRequired is 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/users/all"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The site hosts additional API categories including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Retrieving user data on demand with per-call USDC micropayments","Agent-driven data access without pre-registration or API keys","Programmatic user data fetching settled on Base L2"],"bestFor":["Agents needing keyless, pay-as-you-go data access","Developers who want to avoid subscription commitments for occasional API calls","x402-compatible clients on the Base network"],"notFor":["High-volume bulk data retrieval where per-call pricing adds up","Use cases requiring detailed API documentation or guaranteed SLAs","Users without USDC on Base or x402-compatible payment infrastructure"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.099Z"},"updatedAt":"2026-04-29T07:34:03.807Z"}}