{"id":"c80d3981-77e1-448f-a80d-78a0321f14c0","shortId":"Vpf9xr","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/keys/51` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an x402 payment header to each request.\n\nThe 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/request pricing. The x402 challenge was successfully captured with version 1 of the protocol, confirming the endpoint is live.\n\nHowever, the specific functionality behind `/api/v1/keys/51` (\"Premium API Access\") is not documented — it does not clearly map to any of the named endpoints on the landing page. There is no OpenAPI schema, no request/response examples, and the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no additional documentation. Prospective callers should be aware that the actual behavior of this particular endpoint is unclear.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-platform","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific endpoint /api/v1/keys/51 ('Premium API Access') does not map to any documented endpoint on the landing page — its actual functionality is unknown.","No OpenAPI schema, request/response examples, or detailed documentation available.","The /api, /pricing, and /README pages returned no useful content (only 'Connect wallet').","Without knowing what this endpoint returns, callers cannot predict its behavior."],"endpointUrl":"https://lowpaymentfee.com/api/v1/keys/51","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/keys/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02/request in USDC on Base). However, there is no OpenAPI schema, no request/response examples, no documentation beyond a landing page listing, and the specific endpoint '/api/v1/keys/51' has no description of what it actually returns. The /api, /pricing, and /README pages are empty. This is effectively a stub 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'/api/v1/keys/51':69,182 '/pricing':215 '/readme':217 '/request':19,38,158 '0.02':18,37,80,157 '000':84 '1':168 '20':83 '6':90 'Base network API' 'USDC micropayment API' 'access':75,185 'actual':237 'addit':228 'advertis':114 'ai':12,31,125 'analysi':129 'analyt':119 'api':5,24,45,74,93,184 'attach':104 'awar':234 'base':8,27,63,85 'base-network' 'behavior':238 'behind':181 'broad':50 'call':4,23 'caller':102,231 'captur':165 'catalog':51 'categori':117 'challeng':162 'classif':132 'clear':192 'commit':99 'confirm':172 'connect':223 'convers':149 'cost':77 'crypto-paid API' 'data':11,30,118,122 'decim':91 'document':188,229 'embed':133 'enabl':44 'endpoint':16,35,57,67,116,153,174,199,242 'estim':143 'exampl':211 'exchang':138 'export':123 'feed':137 'financ':13,32,134 'four':115 'function':180 'gas':142 'generat':150 'geocod':147 'header':108 'howev':177 'infrastructur':145 'insight':124 'json-response' 'key':94 'land':202 'learn':127 'limit':96 'list':71,152 'live':176 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':126 'map':193 'metric':120 'name':198 'network':64 'no-api-key' 'offer':10,29 'openapi':207 'page':203,218 'particular':241 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':53 'payment':107 'per':3,22,55,81 'platform':6,25,46,113 'premium':73,183 'premium API access' 'price':136,159 'prompt':225 'prospect':230 'protocol':171 'provid':48 'quot':141 'rate':95,139 'report':121 'request':56,82,111 'request/response':210 'requir':101 'return':220 'schema':208 'sentiment':128 'settl':58 'share':154 'simpli':103 'specif':66,179 'success':164 'summar':131 'text':130 'token':140 'unclear':244 'unit':86 'upfront':98 'usdc':9,28,60,88 'usdc-settlement' 'util':15,34,146 'valid':148 'version':167 'wallet':224 'web3':135 'x402':43,106,161 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"61bed8f5-56a9-4036-a92f-b7d01549744f","listingId":"c80d3981-77e1-448f-a80d-78a0321f14c0","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/keys/51","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:23.716Z"}],"sources":[{"listingId":"c80d3981-77e1-448f-a80d-78a0321f14c0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/keys/51","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:23.716Z","lastSeenAt":"2026-04-22T09:02:15.257Z"}],"details":{"listingId":"c80d3981-77e1-448f-a80d-78a0321f14c0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/keys/51 \\\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":"The endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/keys/51"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/keys/51"},{"claim":"All listed endpoints priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers Data & Analytics, AI & ML, Finance & Web3, and Infrastructure endpoint categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to data, AI, finance, or utility APIs without subscription or API key management","Agent-driven workflows that need on-demand API calls settled via USDC on Base","Prototyping or low-volume usage where per-request pricing avoids commitment"],"bestFor":["Developers or agents wanting zero-signup, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-volume or bursty workloads where flat subscriptions are wasteful"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Callers without a Base-network USDC wallet or x402-capable client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:05.324Z"},"updatedAt":"2026-04-22T09:02:15.257Z"}}