{"id":"50621254-4ea5-4040-ae13-acd622749533","shortId":"SuX6Y9","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is a pay-per-request API platform that uses the x402 protocol to accept USDC payments on the Base network. The specific endpoint `/api/v1/charges/246` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0.02 USD) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers endpoints across 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 utilities (geocoding, validation, conversion, generation). All endpoints are priced uniformly at $0.02 per request.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, 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 description of what the `/api/v1/charges/246` endpoint specifically returns. The x402 challenge confirms the endpoint is live and accepts POST requests, but the actual functionality behind \"Premium API Access\" is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint","json-response"],"categories":["api-platform","crypto"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","402 payment api"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific purpose of /api/v1/charges/246 ('Premium API Access') is not explained anywhere","No request or response examples available to verify actual functionality"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/246","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/charges/246","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation, no request/response examples, and the actual functionality of this specific endpoint is undescribed. The docs pages are empty 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'/api/v1/charges/246':56,189 '/docs':158 '/pricing':159 '/readme':162 '/request':13,28 '0.02':12,27,77,150 '000':72 '20':71 '402':66 '402 payment api' 'accept':46,202 'access':62,92,212 'across':108 'actual':207 'advertis':83 'ai':118 'analysi':122 'analyt':112 'api':5,20,38,61,85,211 'attach':95 'avail':216 'base':8,23,51,73 'base network api' 'behind':209 'broader':104 'call':4,19,80 'categori':110 'challeng':67,195 'classif':125 'confirm':196 'connect':168 'content':174 'convers':142 'data':111,115 'descript':185 'document':153 'embed':126 'endpoint':55,107,145,190,198 'estim':136 'exampl':182 'exchang':131 'export':116 'extrem':155 'feed':130 'financ':127 'four':109 'function':208 'gas':135 'generat':143 'geocod':140 'header':99 'infrastructur':138 'insight':117 'instant':91 'json-response' 'key':86 'learn':120 'limit':89 'list':58 'live':200 'low payment fee' 'lowpaymentfee.com':31 'machin':119 'materi':217 'metric':113 'micropayment api' 'network':9,24,52 'no-api-key' 'offer':106 'openapi':178 'page':163 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,98 'per':3,18,36,79,151 'platform':6,21,39,82,105 'post':203 'post-endpoint' 'premium':60,210 'price':129,147 'prompt':170 'protocol':44 'quot':134 'rate':88,132 'render':165 'report':114 'request':37,68,102,152,204 'request/response':181 'return':64,192 'schema':179 'sentiment':121 'simpli':94 'spars':156 'specif':54,191 'summar':124 'text':123 'token':133 'unclear':214 'uniform':148 'unit':74 'usd':78 'usdc':15,30,47,76 'usdc api' 'usdc-base-network' 'use':41 'util':139 'valid':141 'via':10,25 'wallet':169 'web3':128 'x402':11,26,43,97,194 'x402 api' 'x402-payment'","prices":[{"id":"67f6c172-ea20-4075-9181-0389d27f33a1","listingId":"50621254-4ea5-4040-ae13-acd622749533","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/charges/246","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:44.127Z"}],"sources":[{"listingId":"50621254-4ea5-4040-ae13-acd622749533","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/246","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:44.127Z","lastSeenAt":"2026-04-24T00:31:56.109Z"}],"details":{"listingId":"50621254-4ea5-4040-ae13-acd622749533","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/246 \\\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 requesting up to 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/246"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request costs in USDC on Base","Integrating low-cost utility or data endpoints into automated pipelines"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up without bulk discounts","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.549Z"},"updatedAt":"2026-04-24T00:31:56.109Z"}}