{"id":"015dd621-f35f-4f96-bb42-48dff042188f","shortId":"JBGXmt","kind":"x402","title":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","tagline":"Pay-per-request API platform on Base via x402 — $0.02/call for data, AI, finance, and utility endpoints.","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/orders/79` is listed as \"Premium API Access\" and advertises a max amount of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02. Payment is made by including an X-PAYMENT header with each request — no API keys, accounts, or rate limits are required. The x402 challenge specifies the \"exact\" payment scheme with a 300-second timeout.\n\nDocumentation is extremely sparse. The crawled docs, API, pricing, and README pages all returned 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 actual functionality behind the \"Premium API Access\" label on `/api/v1/orders/79` is unclear — it may be a generic order resource or a demonstration endpoint. Without documentation, the precise input format and response structure cannot be confirmed.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key","no-rate-limits"],"categories":["llm","finance","geo","infrastructure"],"synonyms":["pay per call API","x402 API","micropayment API","USDC API","Base network API","low fee API","crypto payment API","serverless API"],"warnings":["No API documentation available — all doc pages return only 'Connect wallet' with no content","No OpenAPI or JSON schema provided for any endpoint","The specific function of /api/v1/orders/79 is unclear; 'Premium API Access' is a generic label","No request or response examples available to verify actual endpoint behavior","The breadth of advertised capabilities (AI, finance, geocoding, etc.) cannot be verified without documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/79","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/orders/79","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 confirmed) 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/orders/79 ('Premium API Access') is vague and 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'learn':70 'limit':162 'list':119 'low fee API' 'lowpaymentfee.com':39 'machin':69 'made':145 'max':127 'may':230 'metric':63 'micropayment API' 'network':108 'no-api-key' 'no-rate-limits' 'offer':48 'openapi':204 'order':234 'page':189 'paid':102 'pay':2,21,54 'pay per call API' 'pay-per-request':1,20,53 'payment':143,151,171 'per':3,22,55,100 'platform':6,25,46 'precis':243 'premium':121,221 'price':79,97,186 'prompt':196 'protocol':112 'quot':84 'rate':82,161 'readm':188 'report':64 'request':4,23,56,101,155 'request/response':207 'requir':164 'resourc':235 'respons':247 'return':191 'schema':205 'scheme':172 'second':176 'sentiment':71 'sentiment-analysis' 'serverless API' 'spars':181 'specif':114 'specifi':168 'structur':248 'substant':199 'summar':74 'text':73 'text-summarization' 'timeout':177 'token':83 'unclear':228 'unit':133 'usdc':104,135 'usdc-base' 'util':18,37,89 'valid':91 'via':9,28,109 'wallet':195 'web3':78 'without':240 'x':150 'x-payment':149 'x402':10,29,43,111,166 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"2b12e42a-dfa0-49bf-af8b-0788e53fce65","listingId":"015dd621-f35f-4f96-bb42-48dff042188f","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/orders/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:36:16.700Z"}],"sources":[{"listingId":"015dd621-f35f-4f96-bb42-48dff042188f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:36:16.700Z","lastSeenAt":"2026-04-23T19:00:40.678Z"}],"details":{"listingId":"015dd621-f35f-4f96-bb42-48dff042188f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/79 \\\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 priced at $0.02 per request with no API keys, no rate limits, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/orders/79"},{"claim":"Payment scheme is 'exact' with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/orders/79"}],"useCases":["Agents that need on-demand AI inference (sentiment, summarization, classification, embeddings) without managing API keys","Fetching real-time financial data like token quotes, gas estimates, and exchange rates with per-call payment","Running geocoding, validation, or data conversion tasks with no subscription commitment","Programmatic data export and analytics without account setup"],"bestFor":["AI agents needing keyless, pay-per-use API access on Base","Developers who want to avoid subscription commitments for occasional API calls","Web3-native applications that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request pricing at $0.02 adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Applications that cannot handle x402 payment flows or USDC on Base"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:48.318Z"},"updatedAt":"2026-04-23T19:00:40.678Z"}}