{"id":"cb099a80-a95f-4283-af05-75a9855efe3a","shortId":"GbUJes","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 at `/api/v1/payments/65` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02 given USDC's 6 decimals) per call. No API keys, rate limits, or subscriptions are required — each request is individually settled on-chain.\n\nThe broader platform advertises multiple API categories including 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 listed at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/payments/65` endpoint is not documented beyond its \"Premium API Access\" label, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further technical documentation.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with payment details specifying the USDC contract on Base (`0x8335...2913`). The payment recipient is `0x1A2B...85F3`. The endpoint accepts POST requests and returns `application/json`. Due to the lack of detailed documentation about request/response schemas and the unclear nature of what \"Premium API Access\" actually returns, users should treat this as an exploratory endpoint.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","on-chain API payment"],"warnings":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/payments/65 ('Premium API Access') is completely undocumented","No request body schema or response schema is provided","The platform lists many API categories (AI, finance, analytics, etc.) but none have visible documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/65","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/payments/65","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, but there is no documentation on what the endpoint actually does, no request/response schema, and the docs/pricing/API pages are empty beyond a wallet connect prompt. The listing is effectively a stub with confirmed 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'/request':13,28,148 '0.02':12,27,74,147 '000':68 '0x1a2b':214 '0x8335':208 '20':67 '2913':209 '402':198 '6':78 '85f3':215 'Base network API' 'USDC micropayment API' 'accept':46,218 'access':62,166,242 'actual':243 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,83,104,165,173,241 'application/json':223 'base':8,23,51,69,207 'behind':155 'beyond':162 'broader':100 'call':4,19,81 'categori':105 'chain':98 'challeng':196 'charg':64 'classif':121 'connect':179 'contract':205 'convers':138 'crypto API access' 'data':107,111 'decim':79 'detail':201,229 'doc':170 'document':161,186,230 'due':224 'embed':122 'endpoint':55,141,158,188,217,252 'estim':132 'exchang':127 'exploratori':251 'export':112 'feed':126 'financ':123 'function':154 'gas':131 'generat':139 'geocod':136 'given':75 'howev':151 'http':197 'i.e':73 'includ':106 'individu':94 'infrastructur':134 'insight':113 'json-response' 'key':84 'label':59,167 'lack':227 'learn':116 'limit':86 'list':143 'live':190 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'multipl':103 'natur':237 'network':9,24,52 'no-api-key' 'on-chain':96 'on-chain API payment' 'page':174 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,200,211 'per':3,18,36,80 'platform':6,21,39,101 'point':150 'post':219 'post-method' 'premium':60,164,240 'price':125,149,171 'prompt':181 'protocol':44 'quot':130 'rate':85,128 'recipi':212 'render':176 'report':110 'request':37,92,220 'request/response':232 'requir':90 'return':192,222,244 'schema':233 'sentiment':117 'settl':95 'specif':54,153 'specifi':202 'subscript':88 'summar':120 'technic':185 'text':119 'token':129 'treat':247 'unclear':236 'unit':70 'usdc':15,30,47,72,76,204 'usdc-base-network' 'use':41 'user':245 'util':135 'valid':137,194 'via':10,25 'wallet':180 'web3':124 'x402':11,26,43,195 'x402 API' 'x402-payment'","prices":[{"id":"66f80eed-5ca1-4ddb-8891-533be0d9458d","listingId":"cb099a80-a95f-4283-af05-75a9855efe3a","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/payments/65","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:53.215Z"}],"sources":[{"listingId":"cb099a80-a95f-4283-af05-75a9855efe3a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/65","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:53.215Z","lastSeenAt":"2026-04-23T09:31:18.168Z"}],"details":{"listingId":"cb099a80-a95f-4283-af05-75a9855efe3a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/65 \\\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":"Endpoint returns HTTP 402 with x402 challenge specifying USDC on Base network at maxAmountRequired of 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/payments/65"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/65"},{"claim":"Multiple API categories listed including Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Integrating pay-as-you-go API calls without managing API keys or subscriptions","Agent-driven API consumption where each call is individually settled on-chain"],"bestFor":["Developers wanting zero-commitment, per-call API access","AI agents that can autonomously pay for API calls via x402","Users already holding USDC on the Base network"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume use cases where per-request on-chain settlement adds overhead","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.802Z"},"updatedAt":"2026-04-23T09:31:18.168Z"}}