{"id":"e2dd91b6-1fe4-48c4-8932-8b580d84f3a3","shortId":"8qBpLQ","kind":"x402","title":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API marketplace that offers a variety of 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.\n\nThe specific endpoint at `/api/v1/invoices/33` is listed as \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment uses the x402 \"exact\" scheme with a 300-second timeout. No API keys or rate limits are advertised — access is gated entirely by 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 further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation for any endpoint. The exact functionality behind `/api/v1/invoices/33` (labeled \"Premium API Access\") is unclear — it does not appear in the main endpoint listing on the homepage, so its purpose is ambiguous.","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":["llm","finance","geo","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base usdc api","crypto api marketplace","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available for any endpoint","The endpoint /api/v1/invoices/33 ('Premium API Access') is not listed on the homepage — its specific functionality is unknown","No request or response examples are available anywhere in the crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/invoices/33","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge, confirming it works. However, 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 /api/v1/invoices/33 is unclear since it doesn't appear in the homepage listing. The listing is effectively a stub with pricing info 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'/request':19,38 '0.02':18,37,94,135 '000':124 '0x8335':129 '20':123 '2913':130 '300':144 '402':118 '402 payment api' 'access':114,155,209 'across':53 'advertis':154 'ai':12,31,63 'ai-inference' 'ambigu':228 'analysi':67 'analyt':57 'api':5,24,45,113,148,170,208 'appear':215 'base':8,27,102,125,132 'base usdc api' 'behind':204 'call':4,23 'categori':55 'challeng':119 'classif':70 'classification' 'connect':179 'content':185 'convers':87 'crypto api marketplace' 'data':11,30,56,60 'data-analytics' 'detail':196 'doc':169 'document':164,197 'embed':71 'embeddings' 'enabl':44 'endpoint':16,35,52,90,106,200,219 'entir':158 'equal':134 'estim':81 'exact':140,202 'exampl':193 'exchang':76 'export':61 'extrem':166 'feed':75 'financ':13,32,72 'finance-data' 'four':54 'function':203 'gas':80 'gate':157 'generat':88 'geocod':85 'geocoding' 'header':163 'homepag':223 'infrastructur':83 'insight':62 'key':149 'label':206 'learn':65 'limit':152 'list':110,220 'low payment fee' 'lowpaymentfee.com':39 'machin':64 'main':218 'marketplac':46 'metric':58 'micropayment api' 'network':103 'offer':48 'openapi':189 'page':174 'paid':97 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'pay-per-request' 'payment':136,162 'per':3,22,95 'platform':6,25 'premium':112,207 'price':74,92,171 'prompt':181 'purpos':226 'quot':79 'rate':77,151 'readm':173 'render':176 'report':59 'request':96,120 'request/response':192 'return':116 'schema':190 'scheme':141 'second':145 'sentiment':66 'sentiment-analysis' 'spars':167 'specif':105 'summar':69 'text':68 'text-summarization' 'timeout':146 'token':78 'unclear':211 'unit':126 'usdc':99,128 'usdc-base' 'use':137 'util':15,34,84 'utility-apis' 'valid':86 'varieti':50 'via':9,28 'wallet':180 'web3':73 'x402':10,29,43,139,161 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"76d9b9fa-d2c3-4893-9874-04d63ce5a422","listingId":"e2dd91b6-1fe4-48c4-8932-8b580d84f3a3","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/33","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:22.753Z"}],"sources":[{"listingId":"e2dd91b6-1fe4-48c4-8932-8b580d84f3a3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/invoices/33","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:22.753Z","lastSeenAt":"2026-04-23T19:00:41.109Z"}],"details":{"listingId":"e2dd91b6-1fe4-48c4-8932-8b580d84f3a3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/invoices/33 \\\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 Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge requests maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/invoices/33"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API keys","Fetching real-time financial data like token quotes, gas estimates, and exchange rates","Running utility operations like geocoding, validation, and data conversion on a per-call basis","Integrating pay-per-use data analytics into agent workflows"],"bestFor":["Agents needing low-cost, no-signup API access via x402 on Base","Developers prototyping with multiple API categories without committing to subscriptions","Web3-native applications that prefer on-chain payment rails over traditional billing"],"notFor":["Users who need detailed API documentation or OpenAPI schemas before integrating","High-volume production workloads where per-request crypto payments add overhead","Anyone requiring guaranteed SLAs or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:47.992Z"},"updatedAt":"2026-04-23T19:00:41.109Z"}}