{"id":"385d0065-301e-4983-a966-22ee4cc50d78","shortId":"EerNDF","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, settled in USDC on the Base network.\n\nThe specific endpoint at `/api/v1/orders/35` is labeled \"Premium API Access\" and returns a 402 challenge requesting up to 20,000 base units of USDC (i.e., $0.02) via the x402 exact payment scheme. The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism. The endpoint accepts POST requests and returns application/json responses.\n\nDocumentation is extremely sparse. The docs, API, pricing, and README pages all render 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 behavior and response format of the `/api/v1/orders/35` endpoint (or any other listed endpoint) is unknown beyond what the 402 challenge reveals.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","no-api-key"],"categories":["api-platform","ai","finance","data"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["Documentation pages (/docs, /api, /pricing, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific endpoint /api/v1/orders/35 is labeled 'Premium API Access' but its actual function is undocumented and unclear relative to the other listed endpoints","No information on rate limits, uptime guarantees, or data sources"],"endpointUrl":"https://lowpaymentfee.com/api/v1/orders/35","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/35","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 402 challenge, confirming x402 protocol support. However, documentation is essentially nonexistent — all doc pages show only 'Connect wallet'. There is no OpenAPI schema, no request/response examples, and the purpose of '/api/v1/orders/35' specifically (vs. the other listed endpoints) is unclear. The listing is largely a 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'/call':12,31 '0.02':11,30,98,133 '000':127 '20':126 '402':121,224 '402 payment api' 'accept':160 'access':117,151 'across':58 'actual':205 'advertis':142 'ai':15,34,68 'ai-inference' 'analysi':72 'analyt':62 'api':5,24,45,116,144,173 'application/json':165 'authent':156 'base':8,27,106,128 'base network api' 'base-network' 'behavior':206 'beyond':221 'broad':50 'catalog':51 'categori':60 'challeng':122,225 'classif':75 'classification' 'connect':182 'content':188 'convers':91 'data':14,33,61,65 'data-analytics' 'detail':199 'doc':172 'document':167,200 'embed':76 'embeddings' 'enabl':44 'endpoint':19,38,57,94,110,159,203,213,218 'estim':86 'exact':137 'exampl':196 'exchang':81 'export':66 'extrem':169 'feed':80 'financ':16,35,77 'finance-data' 'format':209 'four':59 'gas':85 'generat':92 'geocod':89 'geocoding' 'i.e':132 'infrastructure/utilities':88 'insight':67 'instant':150 'key':145 'label':114 'learn':70 'limit':148 'list':217 'low payment fee' 'lowpaymentfee.com':39 'machin':69 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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/35","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:35:51.916Z"}],"sources":[{"listingId":"385d0065-301e-4983-a966-22ee4cc50d78","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/orders/35","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:35:51.916Z","lastSeenAt":"2026-04-22T23:00:56.176Z"}],"details":{"listingId":"385d0065-301e-4983-a966-22ee4cc50d78","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/orders/35 \\\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 the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The 402 challenge for /api/v1/orders/35 requests up to 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/orders/35"},{"claim":"Available API categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key registration","Fetching real-time financial data like token quotes, gas estimates, and exchange rates on a per-call basis","Running data analytics queries and exporting data with per-request micropayments","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or developers who want instant API access without signup or API keys","Low-volume or sporadic API usage where per-request pricing is more economical than subscriptions","Crypto-native workflows that can settle payments in USDC on Base"],"notFor":["High-volume production workloads where per-request costs would accumulate significantly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Developers without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:49.529Z"},"updatedAt":"2026-04-22T23:00:56.176Z"}}