{"id":"8b4c5d9a-9c47-4dc7-ab24-1a7d7b395ed5","shortId":"cXVPFA","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/272 is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. No API keys, accounts, or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform advertises several API 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 listed at $0.02 per request. However, the specific endpoint probed here (/api/v1/payments/272) does not clearly map to any of these named services — its description is simply \"Premium API Access\" with no further documentation on what it returns.\n\nThe site's documentation pages (/docs, /api, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response examples, and no detailed documentation available. The endpoint is confirmed live (returns a valid 402 challenge), but the lack of documentation about what this specific endpoint actually does is a significant gap.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","crypto API access"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all return only 'Connect wallet' with no content","The endpoint /api/v1/payments/272 has no description beyond 'Premium API Access'; it is unclear what service or data it provides","No OpenAPI spec or request/response schema available","This endpoint path does not match any of the named APIs listed on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/272","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/272","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 documentation, no OpenAPI spec, no request/response examples, and the endpoint description ('Premium API Access') gives no indication of what data or service it actually provides. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/api/v1/payments/272':57,154 '/docs':185 '/pricing':187 '/readme':188 '/request':13,28 '0.02':12,27,74,145 '000':68 '20':67 '402':221 'Base network API' 'USDC pay-per-call' 'accept':46 'access':62,171 'account':80 'actual':233 'advertis':103 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,78,105,170 'attach':88 'avail':212 'base':8,23,51,69 'broader':101 'call':4,19,76 'caller':86 'categori':106 'challeng':222 'charg':64 'classif':121 'clear':157 'confirm':216 'connect':193 'content':199 'convers':138 'crypto API access' 'data':107,111 'descript':166 'detail':210 'document':175,183,211,227 'embed':122 'endpoint':55,141,151,214,232 'estim':132 'exampl':207 'exchang':127 'export':112 'feed':126 'financ':123 'gap':238 'gas':131 'generat':139 'geocod':136 'header':93 'howev':148 'i.e':73 'infrastructur':134 'insight':113 'key':79 'label':59 'lack':225 'learn':116 'limit':83 'list':143 'live':217 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'map':158 'metric':109 'micropayment API' 'name':163 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':203 'page':184 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,92,98 'per':3,18,36,75,146 'platform':6,21,39,102 'premium':60,169 'price':125 'probe':152 'prompt':195 'proof':99 'protocol':44 'quot':130 'rate':82,128 'report':110 'request':37,147 'request/response':206 'requir':85 'return':179,190,218 'sentiment':117 'servic':164 'sever':104 'signific':237 'simpli':87,168 'site':181 'spec':204 'specif':54,150,231 'substant':198 'summar':120 'text':119 'token':129 'unit':70 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':135 'valid':96,137,220 'via':10,25 'wallet':194 'web3':124 'x':91 'x-payment':90 'x402':11,26,43,97 'x402 API' 'x402-payment'","prices":[{"id":"797fefee-7e03-4487-b393-8364e6c84a2f","listingId":"8b4c5d9a-9c47-4dc7-ab24-1a7d7b395ed5","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/272","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:58.441Z"}],"sources":[{"listingId":"8b4c5d9a-9c47-4dc7-ab24-1a7d7b395ed5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/272","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:58.441Z","lastSeenAt":"2026-04-23T14:01:23.924Z"}],"details":{"listingId":"8b4c5d9a-9c47-4dc7-ab24-1a7d7b395ed5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/272 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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","source_url":"https://lowpaymentfee.com/api/v1/payments/272"},{"claim":"All listed APIs 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 lists Data & Analytics, AI & ML, Finance & Web3, and Infrastructure API categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) contain only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API services with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless, pay-per-use API access","Low-volume callers who want no subscription commitments"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.36Z"},"updatedAt":"2026-04-23T14:01:23.924Z"}}