{"id":"008682b1-8001-42df-8860-27173a3e21c8","shortId":"et54Uv","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint at `/api/v1/invoices/49` is labeled \"Premium API Access\" and charges up to $0.02 per call (20,000 base units of USDC with 6 decimals). No API keys or accounts are required — callers authenticate and pay via the x402 protocol's X-PAYMENT header.\n\nThe platform advertises four endpoint 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 with no rate limits or minimum commitments.\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 spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind the `/api/v1/invoices/49` endpoint is unclear beyond its \"Premium API Access\" label; it may be an invoice retrieval or creation endpoint, but this is speculative.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","data-analytics","ai-inference","finance-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["pay-per-call API","x402 API","USDC micropayment API","Base network API","low fee API","crypto-paid API","serverless API marketplace"],"warnings":["Documentation pages (docs, API, pricing, README) all return only a 'Connect wallet' prompt with no actual content","No OpenAPI or schema documentation available for any endpoint","The specific functionality of /api/v1/invoices/49 ('Premium API Access') is unclear — it may differ from the other advertised endpoints","Cannot verify that the advertised AI, finance, data, and utility endpoints actually return meaningful data"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/49","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/49","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/request in USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of the /api/v1/invoices/49 endpoint is ambiguous. Effectively a stub 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'/request':19,38,157 '0.02':18,37,79,156 '000':83 '20':82 '6':89 'Base network API' 'USDC micropayment API' 'access':74,219 'account':95 'advertis':113 'ai':12,31,124 'ai-inference' 'analysi':128 'analyt':118 'api':5,24,45,73,92,172,218 'authent':99 'avail':201 'base':8,27,63,84 'base-network' 'behind':209 'beyond':215 'broad':50 'call':4,23,81 'caller':98 'catalog':51 'categori':116 'charg':76 'classif':131 'commit':165 'connect':181 'content':187 'convers':148 'crawl':204 'creation':228 'crypto-paid API' 'data':11,30,117,121 'data-analytics' 'decim':90 'doc':171 'document':166,196 'embed':132 'enabl':44 'endpoint':16,35,57,67,115,152,212,229 'estim':142 'exampl':200 'exchang':137 'export':122 'extrem':168 'feed':136 'financ':13,32,133 'finance-data' 'four':114 'function':208 'gas':141 'generat':149 'geocod':146 'header':110 'infrastructur':144 'insight':123 'invoic':225 'key':93 'label':71,220 'learn':126 'limit':162 'list':151 'low fee API' 'lowpaymentfee.com':39 'machin':125 'materi':205 'may':222 'metric':119 'minimum':164 'network':64 'no-api-key' 'offer':10,29 'openapi':191 'page':176 'pay':2,21,54,101 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':109 'per':3,22,55,80 'platform':6,25,46,112 'premium':72,217 'price':135,158,173 'prompt':183 'protocol':105 'provid':48 'quot':140 'rate':138,161 'readm':175 'render':178 'report':120 'request':56 'request/response':194 'requir':97 'retriev':226 'schema':195 'sentiment':127 'serverless API marketplace' 'settl':58 'share':153 'spars':169 'spec':192 'specif':66,207 'specul':233 'summar':130 'text':129 'token':139 'unclear':214 'unit':85 'usag':199 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,145 'utility-services' 'valid':147 'via':102 'wallet':182 'web3':134 'x':108 'x-payment':107 'x402':43,104 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"f2115548-51c1-4d91-9637-fcf837827e2a","listingId":"008682b1-8001-42df-8860-27173a3e21c8","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/49","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:07.265Z"}],"sources":[{"listingId":"008682b1-8001-42df-8860-27173a3e21c8","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/49","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:07.265Z","lastSeenAt":"2026-04-23T20:31:57.336Z"}],"details":{"listingId":"008682b1-8001-42df-8860-27173a3e21c8","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/49 \\\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":"The platform charges $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 x402 challenge for /api/v1/invoices/49 specifies maxAmountRequired of 20000 base units of USDC (USD Coin) on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/49"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 using USDC contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/invoices/49"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running utility operations like geocoding, validation, and data conversion with instant crypto payment","Integrating pay-as-you-go data analytics into agent workflows"],"bestFor":["Developers wanting instant API access without registration or API keys","AI agents that can settle payments via x402 on Base","Low-volume or bursty workloads where per-request pricing is more economical than subscriptions"],"notFor":["High-volume production workloads needing SLAs and guaranteed uptime documentation","Users without USDC on the Base network or x402-compatible payment infrastructure"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:51.671Z"},"updatedAt":"2026-04-23T20:31:57.336Z"}}