{"id":"7df69318-e0e4-4d1a-b62b-1780c859c31d","shortId":"rNBecm","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/22` 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/22` endpoint is not documented beyond its \"Premium API Access\" label, and the crawled docs/pricing/README pages returned only a wallet-connect prompt with no additional content.\n\nThe endpoint is live, returning a valid x402 402 challenge with scheme \"exact\" on the Base network, paying to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the USDC contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`. The timeout is 300 seconds. No OpenAPI schema, request/response examples, or detailed documentation were found for this specific endpoint.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","json-response"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","low payment fee API","crypto-paid API"],"warnings":["The specific functionality of /api/v1/payments/22 ('Premium API Access') is not documented — it is unclear what data or service it returns.","All documentation, pricing, and README pages returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The platform lists many API categories (AI, finance, data, etc.) but none have documented request/response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/22","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/22","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, confirming it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and the docs pages are empty beyond a wallet-connect prompt. The actual functionality behind 'Premium API Access' at /api/v1/payments/22 is undocumented, making this effectively a stub 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'/request':13,28,148 '0.02':12,27,74,147 '000':68 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':204 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':209 '20':67 '300':213 '402':192 '6':78 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,166 'addit':182 'address':203 'advertis':102 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,83,104,165 'base':8,23,51,69,199 'behind':155 'beyond':162 'broader':100 'call':4,19,81 'categori':105 'chain':98 'challeng':193 'charg':64 'classif':121 'connect':178 'content':183 'contract':208 'convers':138 'crawl':170 'crypto-paid API' 'data':107,111 'decim':79 'detail':221 'docs/pricing/readme':171 'document':161,222 'embed':122 'endpoint':55,141,158,185,228 'estim':132 'exact':196 'exampl':219 'exchang':127 'export':112 'feed':126 'financ':123 'found':224 'function':154 'gas':131 'generat':139 'geocod':136 'given':75 'howev':151 'i.e':73 'includ':106 'individu':94 'infrastructur':134 'insight':113 'json-response' 'key':84 'label':59,167 'learn':116 'limit':86 'list':143 'live':187 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'multipl':103 'network':9,24,52,200 'no-api-key' 'no-rate-limit' 'on-chain':96 'openapi':216 'page':172 'pay':2,17,35,201 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48 'per':3,18,36,80 'platform':6,21,39,101 'point':150 'premium':60,164 'price':125,149 'prompt':179 'protocol':44 'quot':130 'rate':85,128 'report':110 'request':37,92 'request/response':218 'requir':90 'return':173,188 'schema':217 'scheme':195 'second':214 'sentiment':117 'settl':95 'specif':54,153,227 'subscript':88 'summar':120 'text':119 'timeout':211 'token':129 'unit':70 'usdc':15,30,47,72,76,207 'usdc-base-network' 'use':41,205 'util':135 'valid':137,190 'via':10,25 'wallet':177 'wallet-connect':176 'web3':124 'x402':11,26,43,191 'x402 API' 'x402-payment'","prices":[{"id":"896852be-cf70-45a5-ae23-84ceda69d749","listingId":"7df69318-e0e4-4d1a-b62b-1780c859c31d","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:44.994Z"}],"sources":[{"listingId":"7df69318-e0e4-4d1a-b62b-1780c859c31d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:44.994Z","lastSeenAt":"2026-04-24T05:32:16.837Z"}],"details":{"listingId":"7df69318-e0e4-4d1a-b62b-1780c859c31d","quickStartSnippet":"# The endpoint requires an x402 payment header with USDC on Base.\n# Using curl (you need an x402-compatible client to generate X-PAYMENT):\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/22 \\\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 valid x402 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/22"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/22"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access without subscriptions","x402-compatible wallets and agents on the Base network","Low-cost experimentation with crypto-settled API calls"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who would benefit from bulk pricing or subscriptions","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09Z"},"updatedAt":"2026-04-24T05:32:16.837Z"}}