{"id":"4b685c91-0c06-4ccd-a502-fe4b31b6d3a0","shortId":"ptnsKL","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/397 is labeled \"Premium API Access\" and charges up to 20,000 base units of USDC (i.e., $0.02) per call. The platform requires no API keys, no rate limits, and no upfront commitments — 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 $0.02 per request. However, the specific endpoint probed (/api/v1/payments/397) 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 examples, and no detailed description of what this particular endpoint actually does. The endpoint is confirmed live (returns a proper 402 x402 challenge), but the lack of documentation makes it difficult to know what payload to send or what response to expect.","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","low payment fee API","402 payment API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages all render only 'Connect wallet'","No OpenAPI or schema describing request parameters or response format for this endpoint","The endpoint name 'Premium API Access' is generic and does not describe actual functionality","Cannot determine what data or service this specific endpoint (/api/v1/payments/397) provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/397","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/397","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 x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI spec, no request/response examples, and no description of what 'Premium API Access' actually returns. The listing is effectively a 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'/api/v1/payments/397':57,158 '/docs':182 '/pricing':184 '/readme':186 '/request':13,28 '0.02':12,27,74,150 '000':68 '20':67 '402':226 '402 payment API' 'Base network API' 'USDC micropayment API' 'accept':46 'access':62,165 'actual':216 'advertis':107 'ai':119 'analysi':123 'analyt':113 'api':5,20,38,61,81,109,164 'attach':92 'base':8,23,51,69 'broader':105 'call':4,19,76 'caller':90 'categori':110 'challeng':228 'charg':64 'classif':126 'commit':89 'confirm':221 'connect':192 'content':198 'convers':143 'data':112,116,172 'describ':160 'descript':210 'detail':209 'difficult':236 'document':169,177,233 'embed':127 'endpoint':55,146,156,215,219 'estim':137 'exampl':206 'exchang':132 'expect':247 'export':117 'extrem':179 'feed':131 'financ':128 'function':174 'gas':136 'generat':144 'geocod':141 'header':97 'howev':153 'http-post' 'i.e':73 'includ':111 'infrastructur':139 'insight':118 'key':82 'know':238 'label':59 'lack':231 'learn':121 'limit':85 'list':148 'live':222 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':120 'make':234 'metric':114 'multipl':108 'network':9,24,52 'no-api-key' 'openapi':202 'page':187 'particular':214 'pay':2,17,35 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':34 'payload':240 'payment':48,96,102 'per':3,18,36,75,151 'platform':6,21,39,78,106 'premium':60,163 'price':130 'probe':157 'prompt':194 'proof':103 'proper':225 'protocol':44 'quot':135 'rate':84,133 'render':189 'report':115 'request':37,152 'request/response':205 'requir':79 'respons':245 'return':176,223 'send':242 'sentiment':122 'simpli':91 'spars':180 'spec':203 'specif':54,155 'substant':197 'summar':125 'text':124 'token':134 'unit':70 'upfront':88 'usdc':15,30,47,72 'usdc-base-network' 'use':41 'util':140 'valid':100,142 'via':10,25 'wallet':193 'web3':129 'x':95 'x-payment':94 'x402':11,26,43,101,227 'x402 API' 'x402-payment'","prices":[{"id":"6b8cccd5-1cb0-449f-ba42-c9c6670d3d92","listingId":"4b685c91-0c06-4ccd-a502-fe4b31b6d3a0","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/397","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:40.448Z"}],"sources":[{"listingId":"4b685c91-0c06-4ccd-a502-fe4b31b6d3a0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/397","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:40.448Z","lastSeenAt":"2026-04-23T20:02:38.570Z"}],"details":{"listingId":"4b685c91-0c06-4ccd-a502-fe4b31b6d3a0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/397 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","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/397"},{"claim":"All endpoints 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 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/397"}],"useCases":["Accessing premium API data with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to various utility endpoints"],"bestFor":["Developers wanting zero-signup, pay-per-call API access","AI agents that can settle x402 payments on Base","Users comfortable with USDC micropayments for API calls"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Applications requiring free or subscription-based API access","Users who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.427Z"},"updatedAt":"2026-04-23T20:02:38.570Z"}}