{"id":"3c6cee2e-9fe1-49dd-940f-da49e6bbce4e","shortId":"sMdxJJ","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 collection of endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and general utility services. All endpoints are paid per-request using USDC on the Base network via the x402 protocol — no API keys, no rate limits, and no subscriptions required.\n\nThe specific endpoint at `/api/v1/payments/399` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per call (USDC uses 6 decimals). The broader platform advertises a uniform $0.02/request price across all its endpoints, covering categories like sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, and more.\n\nDocumentation beyond the landing page is sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what request body this particular endpoint expects or what response payload it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base","post-api","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","crypto-data","geocoding","utility-services"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","usdc api","base network api","micropayment api","no-auth api","serverless api"],"warnings":["No OpenAPI or schema documentation available — request/response formats are unknown","All doc pages (/docs, /pricing, /api, /README) return only a 'Connect wallet' prompt with no content","The specific purpose of /api/v1/payments/399 ('Premium API Access') is not explained anywhere; it may be a generic or placeholder endpoint","No examples, error codes, or rate limit information documented"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/399","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/payments/399","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 with clear pricing. However, there is no OpenAPI spec, no request/response schema, and all documentation pages render only a wallet-connect prompt. The purpose of this specific '/payments/399' endpoint is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/api/v1/payments/399':95 '/docs':171 '/pricing':172 '/readme':175 '/request':19,38,140 '0.02':18,37,126,139 '000':115 '0x8335':120 '20':114 '2913':121 '402':212 '6':131 'accept':103 'access':101 'across':142 'advertis':136 'ai':12,31 'ai-inference' 'ai/ml':56 'analysi':150 'analyt':55 'api':5,24,45,82,100 'avail':201 'base':8,27,75,116,123 'base network api' 'beyond':164 'bodi':222 'broader':134 'call':4,23,128 'categori':147 'challeng':108,213 'classif':153 'classification' 'collect':50 'connect':181 'content':187 'cost':112 'cover':146 'crawl':204 'crypto-data' 'data':11,30,54,59 'data-analytics' 'decim':132 'document':163,196,216 'embed':154 'embeddings' 'enabl':44 'endpoint':16,35,52,65,93,145,206,225 'equal':125 'exampl':200 'exchang':157 'expect':226 'feed':156 'financ':13,32 'finance-data' 'finance/web3':58 'general':61 'geocod':159 'geocoding' 'indic':109 'infer':57 'key':83 'land':166 'like':148 'limit':86 'list':97 'live':208 'low payment fee' 'lowpaymentfee.com':39 'maximum':111 'micropayment api' 'network':76 'no-auth api' 'offer':10,29 'openapi':191 'page':167,176 'paid':67 'particular':224 'pay':2,21 'pay per call api' 'pay-per-cal':1,20 'payload':230 'per':3,22,69,127 'per-request':68 'per-request-billing' 'platform':6,25,46,135 'post':104 'post-api' 'premium':99 'price':141,155 'prompt':183 'protocol':80 'provid':48 'rate':85,158 'render':178 'request':70,105,221 'request/response':194 'requir':90 'respons':229 'return':209,232 'schema':195 'sentiment':149 'sentiment-analysis' 'serverless api' 'servic':63 'span':53 'spars':169 'spec':192 'specif':92 'subscript':89 'substant':186 'summar':152 'text':151 'text-summarization' 'unclear':219 'uniform':138 'unit':117 'usag':199 'usdc':9,28,72,119,129 'usdc api' 'usdc-base' 'use':71,130 'util':15,34,62 'utility-services' 'valid':160,211 'via':77 'wallet':182 'without':215 'x402':43,79,107 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"26626c07-ddb8-431c-ba1b-b90fefd03c59","listingId":"3c6cee2e-9fe1-49dd-940f-da49e6bbce4e","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/payments/399","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:38.080Z"}],"sources":[{"listingId":"3c6cee2e-9fe1-49dd-940f-da49e6bbce4e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/399","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:38.080Z","lastSeenAt":"2026-04-22T15:01:39.238Z"}],"details":{"listingId":"3c6cee2e-9fe1-49dd-940f-da49e6bbce4e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/399 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Uniform pricing of $0.02 per request across all endpoints, no API keys, no rate limits","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/399"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/399"},{"claim":"Platform offers endpoints in categories: Data & Analytics, AI & Machine Learning, Finance & Web3, Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents needing on-demand AI inference (sentiment, summarization, classification) without API key management","Fetching real-time crypto token quotes or gas estimates with per-call payment","Running geocoding or data validation as a utility service from an autonomous workflow","Exporting analytics data or generating insights on a pay-as-you-go basis"],"bestFor":["AI agents that need keyless, pay-per-call access to diverse API endpoints","Developers prototyping with low-commitment, no-subscription API access","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-call pricing at $0.02 adds up quickly","Users who need detailed API documentation, SDKs, or guaranteed SLAs before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.549Z"},"updatedAt":"2026-04-22T15:01:39.238Z"}}