{"id":"e136a84e-de94-4bf4-8b56-c2453b9cf6d7","shortId":"maNDH6","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/23` is listed as \"Premium API Access\" and requires a maximum payment of 20,000 base units of USDC (i.e., $0.02) per call. The platform uses the x402 protocol, meaning no API keys or accounts are needed — callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader platform advertises 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 per request price point.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The invoices endpoint's purpose is unclear from the available material; the name \"Premium API Access\" is generic and does not describe what data or functionality is returned. The endpoint is confirmed live via a valid 402 challenge.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["api-platform","ai","finance","data"],"synonyms":["pay per call API","x402 API","USDC API","Base network API","micropayment API","lowpaymentfee","low payment fee","crypto API access"],"warnings":["Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no usable content","No OpenAPI schema or request/response examples available for any endpoint","The purpose of /api/v1/invoices/23 ('Premium API Access') is not explained — unclear what data it returns","The broader platform lists many endpoints but none have documented input/output schemas"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/23","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/23","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 via a valid x402 402 challenge, but documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the specific purpose of the /api/v1/invoices/23 endpoint is unclear. The listing is effectively a stub with pricing 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'/request':19,38 '0.02':18,37,89,167 '000':83 '20':82 '402':245 'Base network API' 'USDC API' 'access':75,224 'account':103 'across':124 'advertis':122 'ai':12,31,134 'ai-inference' 'analysi':138 'analyt':128 'api':5,24,45,74,100,178,223 'attach':108 'avail':218 'base':8,27,63,84 'base-network' 'broad':50 'broader':120 'call':4,23,91 'caller':106 'catalog':51 'categori':126 'challeng':246 'classif':141 'classification' 'confirm':240 'connect':187 'content':193 'convers':158 'cover':10,29 'crypto API access' 'data':11,30,127,131,232 'data-analytics' 'describ':230 'detail':204 'doc':177 'document':172,205 'embed':142 'embeddings' 'enabl':44 'endpoint':16,35,57,67,123,161,208,211,238 'estim':152 'exampl':201 'exchang':147 'export':132 'extrem':174 'feed':146 'financ':13,32,143 'finance-data' 'four':125 'function':234 'gas':151 'generat':159 'generic':226 'geocod':156 'geocoding' 'header':113 'i.e':88 'infrastructur':154 'insight':133 'invoic':210 'key':101 'learn':136 'list':71,163 'live':241 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':135 'materi':219 'maximum':79 'mean':98 'metric':129 'micropayment API' 'name':221 'need':105 'network':64 'no-api-key' 'offer':48 'openapi':197 'page':182 'pay':2,21,54 'pay per call API' 'pay-per-cal':1,20 'pay-per-request':53 'payment':80,112,117 'per':3,22,55,90,168 'platform':6,25,46,93,121 'point':171 'premium':73,222 'price':145,170,179 'prompt':189 'proof':118 'protocol':97 'purpos':213 'quot':150 'rate':148 'readm':181 'render':184 'report':130 'request':56,169 'request/response':200 'requir':77 'return':236 'schema':198 'sentiment':137 'sentiment-analysis' 'settl':58 'simpli':107 'spars':175 'specif':66 'summar':140 'text':139 'text-summarization' 'token':149 'unclear':215 'unit':85 'usdc':9,28,60,87 'usdc-settlement' 'use':94 'util':15,34,155 'utility-apis' 'valid':116,157,244 'via':242 'wallet':188 'web3':144 'x':111 'x-payment':110 'x402':43,96 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7f88b8c7-afa0-4ba4-8ab4-8522ee11c50b","listingId":"e136a84e-de94-4bf4-8b56-c2453b9cf6d7","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/23","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:31.597Z"}],"sources":[{"listingId":"e136a84e-de94-4bf4-8b56-c2453b9cf6d7","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/23","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:31.597Z","lastSeenAt":"2026-04-22T19:30:51.714Z"}],"details":{"listingId":"e136a84e-de94-4bf4-8b56-c2453b9cf6d7","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/23 \\\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 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/23"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/invoices/23"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation, API, pricing, and README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time finance data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with instant crypto-settled micropayments","Using utility services like geocoding and validation without subscription commitments"],"bestFor":["Developers wanting instant API access without signup or API key management","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer pay-per-use over subscriptions"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited plans","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.6Z"},"updatedAt":"2026-04-22T19:30:51.714Z"}}