{"id":"e4638afa-39e2-40c9-be77-96c0f6bc5789","shortId":"vzaaJf","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/174 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 categories of endpoints: 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 /api/v1/payments/174 does not clearly map to any of these named services — its description is simply \"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, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but without knowing what it actually does, callers should treat this as an exploratory integration.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","no-rate-limit","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, /api, /pricing, and /README pages all show only 'Connect wallet' with no content","The endpoint description 'Premium API Access' does not specify what data or functionality is provided","No OpenAPI spec or request/response schema is available","No examples of successful responses exist in the crawl material","The endpoint path /api/v1/payments/174 does not match any of the named services listed on the homepage"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/174","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no indication of what \"Premium API Access\" actually returns. The docs pages are empty. This is effectively a stub 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'/api/v1/payments/174':57,154 '/docs':188 '/pricing':190 '/readme':192 '/request':13,28,148 '0.02':12,27,74,147 '000':68 '20':67 '402':230 '402 payment api' 'accept':46 'access':62,171 'account':80 'actual':237 'advertis':103 'ai':115 'analysi':119 'analyt':109 'api':5,20,38,61,78,170 'attach':88 'avail':217 'base':8,23,51,69 'base network api' 'broader':101 'call':4,19,76 'caller':86,239 'categori':105 'challeng':231 'charg':64 'classif':122 'clear':157 'confirm':225 'connect':198 'content':204 'convers':139 'crawl':220 'data':108,112,178 'descript':166 'document':175,183 'embed':123 'endpoint':55,107,143,153,223 'estim':133 'exampl':216 'exchang':128 'exploratori':245 'export':113 'extrem':185 'feed':127 'financ':124 'function':180 'gas':132 'generat':140 'geocod':137 'header':93 'howev':150 'i.e':73 'infrastructur':135 'insight':114 'integr':246 'json-response' 'key':79 'know':234 'label':59 'learn':117 'limit':83 'list':142 'live':226 'low payment fee' 'lowpaymentfee.com':31 'machin':116 'map':158 'materi':221 'metric':110 'micropayment api' 'name':163 'network':9,24,52 'no-api-key' 'no-rate-limit' 'openapi':208 'page':193 'pay':2,17,35 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':34 'payment':48,92,98 'per':3,18,36,75 'platform':6,21,39,102 'premium':60,169 'price':126,149 'prompt':200 'proof':99 'proper':229 'protocol':44 'quot':131 'rate':82,129 'render':195 'report':111 'request':37 'request/response':211 'requir':85 'return':182,227 'schema':212 'sentiment':118 'servic':164 'sever':104 'share':144 'simpli':87,168 'spars':186 'spec':209 'specif':54,152 'substant':203 'summar':121 'text':120 'token':130 'treat':241 'unit':70 'usag':215 'usdc':15,30,47,72 'usdc api' 'usdc-base-network' 'use':41 'util':136 'valid':96,138 'via':10,25 'wallet':199 'web3':125 'without':233 'x':91 'x-payment':90 'x402':11,26,43,97 'x402 api' 'x402-payment'","prices":[{"id":"1e3b0c13-1a09-40bb-8555-e737e86c7423","listingId":"e4638afa-39e2-40c9-be77-96c0f6bc5789","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/174","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:43.048Z"}],"sources":[{"listingId":"e4638afa-39e2-40c9-be77-96c0f6bc5789","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/174","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:43.048Z","lastSeenAt":"2026-04-23T23:02:44.213Z"}],"details":{"listingId":"e4638afa-39e2-40c9-be77-96c0f6bc5789","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/174 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/174"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/174"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"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 an account or API key","Agent-driven workflows that settle per-request costs in USDC on Base","Exploring x402 protocol integrations with low-cost test endpoints"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-cost per-request API consumption settled on-chain"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch processing where per-call crypto settlement adds overhead","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.093Z"},"updatedAt":"2026-04-23T23:02:44.213Z"}}