{"id":"186c95af-584e-4535-b95d-ccef7ead6da7","shortId":"5cyha8","kind":"x402","title":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) covering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/invoices/29` is listed as \"Premium API Access\" and returns a standard x402 challenge requiring a maximum of 20,000 base units of USDC (i.e., $0.02) per call. The platform advertises no API keys, no rate limits, and instant access — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader platform groups its endpoints into 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 listed endpoints share the same $0.02/request pricing.\n\nNote that the specific `/api/v1/invoices/29` endpoint's purpose is not well-documented beyond the generic \"Premium API Access\" label. No OpenAPI schema, request/response examples, or detailed documentation were found in the crawl. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no substantive content. This makes it difficult to determine what data or functionality this particular endpoint returns.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","lowpaymentfee"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The docs, pricing, API, and README pages contain no substantive content (only 'Connect wallet')","The specific functionality of /api/v1/invoices/29 ('Premium API Access') is not described anywhere","Cannot verify what data or service this endpoint actually returns without making a paid request"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/29","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/invoices/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no meaningful documentation — the docs/pricing/README pages all render only a wallet-connect prompt. The specific purpose of /api/v1/invoices/29 is unknown beyond the generic 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'/request':19,38,171 '0.02':18,37,93,170 '000':87 '20':86 'access':75,107,191 'advertis':98 'ai':12,31,138 'ai-inference' 'analysi':142 'analyt':132 'api':5,24,45,74,100,190,208 'attach':110 'base':8,27,63,88 'base network api' 'beyond':186 'broad':50 'broader':123 'call':4,23,95 'caller':108 'catalog':51 'categori':130 'challeng':81 'classif':145 'classification' 'connect':217 'content':223 'convers':162 'cover':10,29 'crawl':205 'data':11,30,131,135,231 'data-analytics' 'detail':199 'determin':229 'difficult':227 'doc':207 'document':185,200 'embed':146 'embeddings' 'enabl':44 'endpoint':16,35,57,67,127,166,178,236 'estim':156 'exampl':197 'exchang':151 'export':136 'feed':150 'financ':13,32,147 'finance-data' 'found':202 'four':129 'function':233 'gas':155 'generat':163 'generic':188 'geocod':160 'geocoding' 'group':125 'header':115 'i.e':92 'infrastructur':158 'insight':137 'instant':106 'key':101 'label':192 'learn':140 'limit':104 'list':71,165 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':139 'make':225 'maximum':84 'metric':133 'micropayment api' 'network':64 'note':173 'offer':48 'openapi':194 'page':212 'particular':235 'pay':2,21,54 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':114,120 'per':3,22,55,94 'platform':6,25,46,97,124 'premium':73,189 'price':149,172,209 'prompt':219 'proof':121 'purpos':180 'quot':154 'rate':103,152 'readm':211 'report':134 'request':56 'request/response':196 'requir':82 'return':77,214,237 'schema':195 'sentiment':141 'sentiment-analysis' 'settl':58 'share':167 'simpli':109 'specif':66,176 'standard':79 'substant':222 'summar':144 'text':143 'text-summarization' 'token':153 'unit':89 'usdc':9,28,60,91 'usdc api' 'usdc-base' 'util':15,34,159 'utility-apis' 'valid':118,161 'wallet':218 'web3':148 'well':184 'well-docu':183 'x':113 'x-payment':112 'x402':43,80,119 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"0425a001-9551-437d-ae3b-cc3c4618108a","listingId":"186c95af-584e-4535-b95d-ccef7ead6da7","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/invoices/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:18.616Z"}],"sources":[{"listingId":"186c95af-584e-4535-b95d-ccef7ead6da7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:18.616Z","lastSeenAt":"2026-04-23T00:31:09.354Z"}],"details":{"listingId":"186c95af-584e-4535-b95d-ccef7ead6da7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/29 \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -H \"Content-Type: application/json\"","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/invoices/29"},{"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":"The platform offers endpoints in Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/invoices/29"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data like token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use data analytics and reporting into agent workflows"],"bestFor":["AI agents needing low-friction, keyless API access to diverse endpoints","Developers who want pay-as-you-go pricing without subscriptions or rate limits","Crypto-native applications already operating on the Base network with USDC"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.063Z"},"updatedAt":"2026-04-23T00:31:09.354Z"}}