{"id":"633fabe2-356c-4427-b8a3-e251a0c79475","shortId":"GtVA63","kind":"x402","title":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","tagline":"Pay-per-request API collection on Base via x402 — data, AI, finance, and utility endpoints at $0.02/call.","description":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 payment protocol on the Base network. The specific endpoint at `/api/v1/collections/50` is described as \"Premium API Access\" and accepts payment in USDC (contract 0x8335…2913 on Base). The maximum amount required per call is 20,000 base units of USDC, which at 6 decimals equals $0.02 per request.\n\nThe broader platform advertises four categories of APIs: 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 listed at $0.02 per request with no API keys, no rate limits, and no minimum commitments required.\n\nDocumentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed documentation available from the crawl. The `/api/v1/collections/50` endpoint appears to be a bundled or collection-level access point, but its exact behavior and response format are unknown beyond the x402 challenge metadata indicating it returns `application/json` via HTTP POST.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-base","data-analytics","ai-inference","sentiment-analysis","text-summarization","classification","embeddings","finance-data","geocoding","utility-apis"],"categories":["ai","data","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api access","serverless api","no-auth api"],"warnings":["Documentation pages (docs, pricing, README, api) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The specific behavior of /api/v1/collections/50 vs individual endpoints is undocumented","No examples of actual API responses are available from any source"],"endpointUrl":"https://lowpaymentfee.com/api/v1/collections/50","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/collections/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but documentation is effectively nonexistent — every doc/pricing/README page shows only 'Connect wallet'. No OpenAPI schema, no request/response examples, and the purpose of the /collections/50 endpoint specifically is unclear. This is essentially a stub 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'key':154 'learn':119 'level':212 'limit':157 'list':146 'low payment fee' 'lowpaymentfee.com':39 'machin':118 'maximum':82 'metadata':228 'metric':112 'micropayment api' 'minimum':160 'network':59 'no-auth api' 'openapi':188 'page':173 'pay':2,21,45 'pay per call api' 'pay-per-request':1,20,44 'payment':54,73 'per':3,22,46,85,100,149 'platform':104 'point':214 'post':235 'premium':68 'price':128,170 'prompt':180 'protocol':55 'quot':133 'rate':131,156 'readm':172 'render':175 'report':113 'request':4,23,47,101,150 'request/response':191 'requir':84,162 'respons':220 'return':231 'schema':189 'sentiment':120 'sentiment-analysis' 'serverless api' 'spars':166 'specif':61 'summar':123 'text':122 'text-summarization' 'token':132 'unit':91 'unknown':223 'usdc':75,93 'usdc api access' 'usdc-base' 'util':15,34,138 'utility-apis' 'valid':140 'via':9,28,51,233 'wallet':179 'web3':127 'x402':10,29,53,226 'x402 api' 'x402-payment'","prices":[{"id":"2a8730a8-4d72-4c1f-8a73-f3168283449c","listingId":"633fabe2-356c-4427-b8a3-e251a0c79475","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/collections/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-19T00:59:36.448Z"}],"sources":[{"listingId":"633fabe2-356c-4427-b8a3-e251a0c79475","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/collections/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-19T00:59:36.448Z","lastSeenAt":"2026-04-22T02:31:45.935Z"}],"details":{"listingId":"633fabe2-356c-4427-b8a3-e251a0c79475","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/collections/50 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/collections/50"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/collections/50"},{"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 APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing AI inference endpoints (sentiment, summarization, classification, embeddings) without API key management","Fetching real-time financial data such as token quotes, gas estimates, and exchange rates on a per-request basis","Running data analytics queries and exporting data with pay-as-you-go pricing","Using utility services like geocoding, validation, and conversion without subscriptions"],"bestFor":["Agents or applications that need low-friction, keyless API access paid in crypto","Developers who want pay-per-use pricing without rate limits or commitments","Web3-native workflows that can settle micropayments in USDC on Base"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscription plans","Teams that cannot transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:24.75Z"},"updatedAt":"2026-04-22T02:31:45.935Z"}}