{"id":"36d43e7d-41c6-4707-9ec9-659569de34f1","shortId":"6fLjCe","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/273` is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — you simply attach an x402 payment header to each request.\n\nThe broader platform offers 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 endpoints are listed at the same $0.02/request price point.\n\nHowever, the specific functionality behind the `/api/v1/payments/273` endpoint is unclear. The description is simply \"Premium API Access\" with no further documentation about what data or service it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"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":["No documentation available — docs, pricing, and API pages all show only 'Connect wallet' with no content","The specific functionality of /api/v1/payments/273 ('Premium API Access') is completely undocumented","No OpenAPI schema or request/response examples available","No information about what data or service is returned by this endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/273","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/273","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns 402 with a valid x402 challenge), and pricing is clear ($0.02 USDC on Base). However, there is no documentation about what this specific endpoint actually does, no OpenAPI schema, no request/response examples, and the site's docs pages are empty beyond a wallet connect prompt. The listing is effectively a 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'/request':13,28,148 '0.02':12,27,74,147 '000':68 '20':67 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,88,167 'across':104 'addit':197 'advertis':79 'ai':114 'analysi':118 'analyt':108 'api':5,20,38,61,81,166,183 'attach':91 'avail':211 'base':8,23,51,69 'behind':155 'broader':100 'call':4,19,76 'categori':106 'charg':64 'classif':121 'connect':192 'content':198 'convers':138 'crawl':214 'crypto-paid API' 'data':107,111,174 'descript':162 'detail':209 'doc':180 'document':171,210 'embed':122 'endpoint':55,103,141,158 'estim':132 'exampl':206 'exchang':127 'export':112 'feed':126 'financ':123 'four':105 'function':154 'gas':131 'generat':139 'geocod':136 'header':95 'howev':151 'i.e':73 'infrastructur':134 'insight':113 'instant':87 'json-response' 'key':82 'label':59 'learn':116 'limit':85 'list':143 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':115 'metric':109 'network':9,24,52 'no-api-key' 'offer':102 'openapi':202 'page':184 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payment':48,94 'per':3,18,36,75 'platform':6,21,39,78,101 'point':150 'post-method' 'premium':60,165 'price':125,149,181 'prompt':194 'protocol':44 'quot':130 'rate':84,128 'render':189 'report':110 'request':37,98 'request/response':205 'return':178 'schema':203 'sentiment':117 'servic':176 'simpli':90,164 'site':187 'specif':54,153 'summar':120 'text':119 'token':129 'unclear':160 'unit':70 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':135 'valid':137 'via':10,25 'wallet':193 'web3':124 'x402':11,26,43,93 'x402 API' 'x402-payment'","prices":[{"id":"ef203ec4-6e4e-4d3c-bd5b-09516713d905","listingId":"36d43e7d-41c6-4707-9ec9-659569de34f1","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/273","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:01.482Z"}],"sources":[{"listingId":"36d43e7d-41c6-4707-9ec9-659569de34f1","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/273","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:01.482Z","lastSeenAt":"2026-04-24T03:03:25.002Z"}],"details":{"listingId":"36d43e7d-41c6-4707-9ec9-659569de34f1","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/273 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/273"},{"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":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/273"}],"useCases":["Accessing premium API services with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Testing x402 protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless API access with crypto micropayments","Low-volume, on-demand API consumption without subscriptions"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","High-volume use cases where $0.02/request adds up significantly","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.237Z"},"updatedAt":"2026-04-24T03:03:25.002Z"}}