{"id":"3797cfd6-3935-40db-9b3a-ad95db838a04","shortId":"bXPyry","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — $0.02/request, no API keys required.","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 `/api/v1/payments/320` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys, accounts, or rate limits are advertised — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\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 and settle via USDC on Base.\n\nDocumentation is extremely sparse — the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what the `/api/v1/payments/320` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post"],"categories":["api-platform","payments"],"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, pricing, and API pages all show only 'Connect wallet' with no content","No OpenAPI or JSON schema describing request parameters or response format","The specific function of /api/v1/payments/320 ('Premium API Access') is undocumented and unclear","Cannot verify what data or service is actually returned after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/320","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/320","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 it accepts USDC on Base at $0.02/request. However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a wallet-connect prompt. The purpose of this specific endpoint (/api/v1/payments/320) is entirely unclear — 'Premium API Access' is a generic label with no specification of inputs or 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'/request':13,30,153 '0.02':12,29,69,152 '000':73 '20':72 '402':208 '402 payment api' '6':79 'accept':50 'access':66,227 'account':84 'actual':199 'advertis':89,107 'ai':119 'analysi':123 'analyt':113 'api':5,15,22,32,42,65,82,109,170,226 'attach':92 'base':8,25,55,74,161 'base network api' 'beyond':222 'broader':105 'call':4,21,71 'caller':90 'categori':110 'challeng':209 'classif':126 'connect':176 'content':182 'convers':143 'cost':68 'data':112,116,217 'decim':80 'descript':193 'doc':167 'document':162,212 'embed':127 'endpoint':59,146,198,202 'estim':137 'exampl':190 'exchang':132 'export':117 'extrem':164 'feed':131 'financ':128 'function':219 'gas':136 'generat':144 'generic':224 'geocod':141 'header':97 'http-post' 'includ':111 'infrastructur':139 'insight':118 'key':16,33,83 'label':228 'learn':121 'limit':87 'list':62,148 'live':204 'low payment fee' 'lowpaymentfee.com':35 'machin':120 'metric':114 'micropayment api' 'multipl':108 'network':56 'no-api-key' 'openapi':186 'page':171 'pay':2,19,39 'pay per call api' 'pay-per-cal':1,18 'pay-per-request':38 'payment':52,96,102 'per':3,20,40,70 'platform':6,23,43,106 'point':155 'premium':64,225 'price':130,154,168 'prompt':178 'proof':103 'protocol':48 'provid':221 'quot':135 'rate':86,133 'render':173 'report':115 'request':41 'request/response':189 'requir':17,34 'return':200,205 'schema':187 'sentiment':122 'settl':157 'simpli':91 'spars':165 'specif':58 'summar':125 'text':124 'token':134 'unclear':215 'unit':75 'usdc':9,26,51,77,159 'usdc api' 'usdc-base' 'use':45 'util':140 'valid':100,142,207 'via':10,27,158 'wallet':177 'web3':129 'without':211 'x':95 'x-payment':94 'x402':11,28,47,101 'x402 api' 'x402-payment'","prices":[{"id":"b8c11453-59d9-4251-8ea7-e31f525f45a2","listingId":"3797cfd6-3935-40db-9b3a-ad95db838a04","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/320","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:24.116Z"}],"sources":[{"listingId":"3797cfd6-3935-40db-9b3a-ad95db838a04","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/320","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:24.116Z","lastSeenAt":"2026-04-23T23:02:46.065Z"}],"details":{"listingId":"3797cfd6-3935-40db-9b3a-ad95db838a04","quickStartSnippet":"# The endpoint expects an x402 X-PAYMENT header with a valid payment proof.\n# Without a payment SDK this is illustrative only.\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/320 \\\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 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/320"},{"claim":"All endpoints are listed at $0.02/request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/320"}],"useCases":["Agent-driven API consumption with automatic per-call USDC micropayments","Accessing premium data or services without account registration or API key management","Programmatic pay-as-you-go access to analytics, AI, finance, or utility endpoints"],"bestFor":["Developers or agents wanting zero-signup, pay-per-use API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs before purchasing","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.151Z"},"updatedAt":"2026-04-23T23:02:46.065Z"}}