{"id":"f909f055-ba19-411b-ade2-3aefcded44cf","shortId":"VzCypK","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/payments/45` is listed as \"Premium API Access\" and costs $0.02 per call (20,000 base units of USDC with 6 decimals). Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe wider 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 per request pricing.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The endpoint is confirmed live (returns a proper 402 challenge), but the actual behavior and response format of `/api/v1/payments/45` specifically is unclear from available sources.","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","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request parameters or response format","The specific purpose of /api/v1/payments/45 ('Premium API Access') is unclear and may be a generic or demo endpoint","No examples of actual request/response payloads available from any crawled source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/45","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is confirmed live with a valid 402 challenge and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, and all documentation pages return only a wallet-connect prompt. The purpose of this specific endpoint ('/api/v1/payments/45') is ambiguous — it could be a generic demo or a specific service. Effectively a stub 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'lowpaymentfee' 'lowpaymentfee.com':39 'machin':134 'materi':208 'metric':128 'micropayment API' 'network':64 'no-api-key' 'offer':10,29 'openapi':194 'page':178 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':90,112,117 'per':3,22,55,79,165 'platform':6,25,46,121 'premium':73 'price':144,167 'prompt':185 'proof':118 'proper':216 'protocol':96 'provid':48 'quot':149 'rate':102,147 'render':180 'report':129 'request':56,166 'request/response':197 'requir':105 'respons':224 'return':214 'schema':198 'sentiment':136 'settl':58 'share':161 'simpli':107 'sourc':233 'spars':171 'spec':195 'specif':66,228 'summar':139 'technic':189 'text':138 'token':148 'unclear':230 'unit':84 'usag':202 'usdc':9,28,60,86 'usdc-settlement' 'util':15,34 'utility-services' 'valid':116,155 'via':93 'wallet':184 'web3':143 'wider':120 'x':111 'x-payment':110 'x402':43,95 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"7528900a-5913-47d1-b66c-48d762163bbd","listingId":"f909f055-ba19-411b-ade2-3aefcded44cf","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/45","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:45.255Z"}],"sources":[{"listingId":"f909f055-ba19-411b-ade2-3aefcded44cf","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/45","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:45.255Z","lastSeenAt":"2026-04-23T23:02:47.057Z"}],"details":{"listingId":"f909f055-ba19-411b-ade2-3aefcded44cf","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/45 \\\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 402 challenge with maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/45"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/45"}],"useCases":["Accessing data analytics and reports without creating an account or managing API keys","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching financial data such as token prices, exchange rates, and gas estimates via crypto micropayments","Using utility endpoints like geocoding, validation, and conversion with instant USDC settlement"],"bestFor":["Developers who want instant API access without signup or subscription","Agents and bots that can settle payments programmatically via x402 on Base","Low-volume or sporadic API consumers who prefer pay-per-use over monthly plans"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or rate-limited tiers","Developers without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.173Z"},"updatedAt":"2026-04-23T23:02:47.057Z"}}