{"id":"319bf0f6-da0a-40b9-91e2-3a07775bda41","shortId":"bRQWHJ","kind":"x402","title":"Pay-per-request API platform on Base network via x402 — $0.02/call in USDC.","tagline":"Pay-per-request API platform on Base network via x402 — $0.02/call 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/241 is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per request. No API keys, rate limits, or subscriptions are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (/api/v1/payments/241) is described only as \"Premium API Access\" with no further documentation on what data or functionality it returns.\n\nDocumentation is extremely sparse. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 x402 challenge), but without documentation it is unclear what this specific endpoint actually does or what request body it expects.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all show only 'Connect wallet' with no content.","The specific functionality of /api/v1/payments/241 ('Premium API Access') is undocumented; it is unclear what it returns or what request body it expects.","No OpenAPI spec or output schema beyond basic HTTP method metadata.","No request or response examples available from any source."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/241","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/241","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming it accepts USDC on Base at $0.02/request. However, there is no documentation, no OpenAPI spec, no request/response examples, and the purpose of this specific endpoint (/api/v1/payments/241) is entirely undocumented. The docs pages are empty. This is effectively a stub 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'/api/v1/payments/241':57,157 '/call':13,28 '/docs':181 '/pricing':183 '/readme':185 '/request':148 '0.02':12,27,74,147 '000':68 '20':67 '402':224 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,164 'across':105 'actual':237 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,78,163 'attach':88 'avail':211 'base':8,23,51,69 'bodi':242 'broader':101 'caller':86 'categori':107 'challeng':226 'charg':64 'classif':122 'confirm':219 'connect':191 'content':197 'convers':139 'crawl':214 'crypto-paid API' 'data':108,112,171 'describ':159 'document':168,176,206,229 'embed':123 'endpoint':55,104,143,153,217,236 'estim':133 'exampl':210 'exchang':128 'expect':244 'export':113 'extrem':178 'feed':127 'financ':124 'four':106 'function':173 'gas':132 'generat':140 'geocod':137 'header':93 'howev':150 'http-post' 'i.e':73 'infrastructur':135 'insight':114 'key':79 'label':59 'learn':117 'limit':81 'list':142,155 'live':220 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':116 'materi':215 'metric':110 'network':9,24,52 'no-api-key' 'openapi':201 'page':186 'pay':2,17,35 'pay-per-call API' 'pay-per-request':1,16,34 'payment':48,92,98 'per':3,18,36,75 'platform':6,21,39,102 'premium':60,162 'price':126,149 'prompt':193 'proof':99 'proper':223 'protocol':44 'quot':131 'rate':80,129 'render':188 'report':111 'request':4,19,37,76,241 'request/response':204 'requir':85 'return':175,221 'schema':205 'sentiment':118 'share':144 'simpli':87 'spars':179 'spec':202 'specif':54,152,235 'subscript':83 'substant':196 'summar':121 'text':120 'token':130 'unclear':232 'unit':70 'usag':209 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':136 'valid':96,138 'via':10,25 'wallet':192 'web3':125 'without':228 'x':91 'x-payment':90 'x402':11,26,43,97,225 'x402 API' 'x402-payment'","prices":[{"id":"f65cd430-af6c-4f9a-8ace-23e72ddf076d","listingId":"319bf0f6-da0a-40b9-91e2-3a07775bda41","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/241","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:08.808Z"}],"sources":[{"listingId":"319bf0f6-da0a-40b9-91e2-3a07775bda41","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/241","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:08.808Z","lastSeenAt":"2026-04-24T01:32:20.644Z"}],"details":{"listingId":"319bf0f6-da0a-40b9-91e2-3a07775bda41","quickStartSnippet":"# The endpoint requires an x402 X-PAYMENT header with a valid payment proof.\n# Using curl to see the 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/241 \\\n  -H 'Content-Type: application/json'\n# Returns 402 with x402 challenge. Attach a valid X-PAYMENT header to complete the call.","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/241"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/241"},{"claim":"Platform lists endpoints 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 API consumption without pre-registration or API keys","Testing x402 protocol integration with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.879Z"},"updatedAt":"2026-04-24T01:32:20.644Z"}}