{"id":"773d250d-a86e-4d60-ab13-533e2d8daa7a","shortId":"45q3Uy","kind":"x402","title":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad catalog of pay-per-request 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 priced at $0.02 per request, paid in USDC on the Base network via the x402 protocol.\n\nThe specific endpoint at `/api/v1/invoices/22` is listed as \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC = $0.02), consistent with the site-wide pricing. The platform advertises no API keys, no rate limits, no minimums, and instant access — payment is handled entirely through the x402 payment header.\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 schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality behind `/api/v1/invoices/22` (as opposed to the other listed endpoints) is unclear from available materials. Agents should be aware that without schemas or examples, integration requires experimentation or additional out-of-band information.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","sentiment-analysis","text-summarization","classification","embeddings","price-feeds","exchange-rates","gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","llm","finance","geo"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","lowpaymentfee"],"warnings":["No OpenAPI schema or AI plugin manifest available","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no substantive content","The exact functionality of /api/v1/invoices/22 ('Premium API Access') is not documented — it does not appear in the site's listed endpoint catalog","No request or response examples are available for any endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/22","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/22","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 captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and all documentation pages return only a wallet-connect prompt. The specific purpose of /api/v1/invoices/22 versus the other listed endpoints is 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'/call':19,38 '0.02':18,37,99,136,138 '000':131 '20':130 'access':123,159 'across':58 'addit':236 'advertis':148 'agent':223 'ai':12,31,68 'analysi':72 'analyt':62 'api':5,24,45,122,150,175 'avail':221 'awar':226 'band':240 'base':8,27,107,132 'base usdc api' 'behind':209 'broad':50 'carri':125 'catalog':51 'categori':60 'charg':128 'classif':75 'classification' 'connect':184 'consist':139 'content':190 'convers':92 'conversion' 'data':11,30,61,65 'data-analytics' 'detail':201 'doc':174 'document':169,202 'embed':76 'embeddings' 'enabl':44 'endpoint':16,35,57,95,115,205,217 'entir':163 'estim':86 'exact':207 'exampl':198,231 'exchang':81 'exchange-rates' 'experiment':234 'export':66 'extrem':171 'feed':80 'financ':13,32,77 'four':59 'function':208 'gas':85 'gas-estimates' 'generat':93 'geocod':90 'geocoding' 'handl':162 'header':168 'inform':241 'infrastructur':88 'insight':67 'instant':158 'integr':232 'key':151 'learn':70 'limit':154 'list':119,216 'low payment fee' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':69 'materi':222 'maximum':127 'metric':63 'micropayment api' 'minimum':156 'network':108 'offer':48 'openapi':194 'oppos':212 'out-of-band':237 'page':179 'paid':102 'pay':2,21,54 'pay per call api' 'pay-per-request':1,20,53 'payment':160,167 'per':3,22,55,100 'platform':6,25,46,147 'premium':121 'price':79,97,145,176 'price-feeds' 'prompt':186 'protocol':112 'quot':84 'rate':82,153 'readm':178 'render':181 'report':64 'request':4,23,56,101 'request/response':197 'requir':233 'schema':195,229 'sentiment':71 'sentiment-analysis' 'site':143 'site-wid':142 'spars':172 'specif':114 'substant':189 'summar':74 'text':73 'text-summarization' 'token':83 'unclear':219 'unit':133 'usdc':104,135,137 'usdc-base' 'util':15,34,89 'valid':91 'validation' 'via':9,28,109 'wallet':185 'web3':78 'wide':144 'without':228 'x402':10,29,43,111,166 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"637ecd97-cac9-4714-98aa-88de2abc5631","listingId":"773d250d-a86e-4d60-ab13-533e2d8daa7a","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/22","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:23.365Z"}],"sources":[{"listingId":"773d250d-a86e-4d60-ab13-533e2d8daa7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/22","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:23.365Z","lastSeenAt":"2026-04-23T19:00:41.150Z"}],"details":{"listingId":"773d250d-a86e-4d60-ab13-533e2d8daa7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/22 \\\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":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on the Base network","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":"The x402 challenge for /api/v1/invoices/22 shows maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/22"},{"claim":"Documentation pages render only a 'Connect wallet' prompt with no substantive content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, exchange rates, and gas estimates","Running utility operations like geocoding, validation, and data conversion on a per-request payment basis","Exporting data or generating analytics reports with no subscription commitment"],"bestFor":["Agents or developers who want zero-signup, pay-as-you-go API access","Crypto-native applications that can settle payments in USDC on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads that need guaranteed SLAs and detailed documentation","Developers who need comprehensive OpenAPI schemas and request/response examples before integration"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.909Z"},"updatedAt":"2026-04-23T19:00:41.150Z"}}