{"id":"aa3bf87c-42f9-4c19-9e7d-9d746220c7cd","shortId":"eAjprc","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request in USDC.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a variety of endpoints across data & analytics, AI & machine learning, finance & Web3, and infrastructure/utility categories. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint at `/api/v1/transactions/19` is labeled \"Premium API Access\" and carries a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) per call. Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the x402 exact-payment scheme. The endpoint accepts POST requests and returns `application/json`.\n\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse: the docs, API, pricing, 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 actual functionality behind this particular `/transactions/19` endpoint is unclear — the name \"Premium API Access\" is generic and does not describe what data or service is returned.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["infrastructure","finance"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","on-chain payment API"],"warnings":["No OpenAPI or schema documentation available — impossible to determine request parameters or response format","The endpoint name 'Premium API Access' is generic and does not describe what the endpoint actually does","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content","Cannot verify what data or service is returned by /api/v1/transactions/19"],"endpointUrl":"https://lowpaymentfee.com/api/v1/transactions/19","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/transactions/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the actual functionality of this specific endpoint is completely undescribed. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/request':13,28 '/transactions/19':219 '0.02':12,27,61,104,107,164 '000':99 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':118 '20':98 'Base network API' 'USDC micropayment API' 'accept':128 'access':91,227 'across':45 'actual':214 'address':117 'advertis':137 'ai':48 'analysi':141 'analyt':47 'api':5,20,37,73,90,178,226 'application/json':133 'avail':208 'base':8,23,69,100 'behind':216 'beyond':169 'broader':135 'call':4,19,109 'carri':93 'categori':55 'chain':115 'charg':96 'classif':144 'commit':80 'connect':187 'convers':156 'crawl':211 'crypto-paid API' 'data':46,158,235 'describ':233 'detail':194 'doc':177 'document':168,203 'embed':145 'enabl':36 'endpoint':44,57,84,127,138,220 'estim':153 'exact':123 'exact-pay':122 'exampl':207 'exchang':148 'extrem':174 'feed':147 'financ':51 'function':215 'gas':152 'generat':159 'generic':229 'geocod':154 'howev':167 'i.e':106 'infrastructure/utility':54 'json-response' 'key':74 'label':88 'land':171 'learn':50 'limit':77 'lowpaymentfee' 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'x402-payment'","prices":[{"id":"603d44ec-fc87-4f58-a2eb-f54b4bf8909d","listingId":"aa3bf87c-42f9-4c19-9e7d-9d746220c7cd","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/transactions/19","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:59:05.398Z"}],"sources":[{"listingId":"aa3bf87c-42f9-4c19-9e7d-9d746220c7cd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/transactions/19","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:59:05.398Z","lastSeenAt":"2026-04-24T20:03:14.392Z"}],"details":{"listingId":"aa3bf87c-42f9-4c19-9e7d-9d746220c7cd","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Without a payment library, you'll get a 402 challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/transactions/19 \\\n  -H 'Content-Type: application/json'","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, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0.02 USDC) on Base network","source_url":"https://lowpaymentfee.com/api/v1/transactions/19"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing paid API endpoints without traditional API key registration","Making micropayment-gated API calls settled in USDC on Base","Integrating pay-per-use services into agent workflows via x402 protocol"],"bestFor":["Developers wanting keyless, pay-per-call API access","AI agents that can settle x402 payments on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput batch processing with predictable billing","Developers who cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:42.252Z"},"updatedAt":"2026-04-24T20:03:14.392Z"}}