{"id":"afcc2aa5-2a65-4408-95df-b7e59da9c63f","shortId":"AZYGRz","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","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/payments/199` is labeled \"Premium API Access\" and requires a payment of up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per request. Payment is settled on-chain with no API keys, no rate limits, and no subscriptions required.\n\nThe broader platform advertises 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 listed at $0.02 per request. However, the specific `/api/v1/payments/199` endpoint's purpose is not clearly documented beyond the generic \"Premium API Access\" label — it does not map to any of the named API categories on the landing page.\n\nDocumentation is extremely thin. The /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail, schemas, or usage examples. There is no OpenAPI spec, no request/response schema, and no description of what data or functionality this particular endpoint returns. The x402 challenge is live and well-formed, confirming the endpoint is operational, but the lack of documentation makes it difficult to know what you'll receive after payment.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","no-api-key","pay-per-use"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","crypto-paid API","on-chain API access"],"warnings":["No documentation available — /docs, /pricing, /api, and /README all show only 'Connect wallet' with no content.","The endpoint path /api/v1/payments/199 does not correspond to any of the named APIs on the landing page; its actual functionality is unknown.","No request or response schema is provided; callers cannot know what to send or what they will receive.","No OpenAPI or ai-plugin manifest found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/199","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/payments/199","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 well-formed, confirming the endpoint works and costs $0.02 USDC on Base. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a wallet-connect prompt, and the specific purpose of /api/v1/payments/199 is unclear. This is effectively a stub 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'/api/v1/payments/199':56,155 '/docs':190 '/pricing':192 '/readme':194 '/request':13,28 '0.02':12,27,83,149 '000':70 '0x8335':75 '20':69 '2913':76 '6':79 'Base network API' 'USDC micropayment API' 'access':7,22,42,61,168 'across':108 'advertis':106 'ai':118 'analysi':122 'analyt':112 'api':6,21,40,60,94,167,179 'base':9,24,50,71,78 'base-network' 'beyond':163 'broader':104 'call':4,19 'categori':110,180 'chain':91 'challeng':234 'classif':125 'clear':161 'collect':34 'confirm':241 'connect':200 'convers':142 'crypto-paid API' 'data':111,115,225 'decim':80 'descript':222 'detail':207 'difficult':253 'document':162,185,250 'embed':126 'endpoint':41,54,107,145,156,230,243 'equal':82 'estim':136 'exampl':211 'exchang':131 'export':116 'extrem':187 'feed':130 'financ':127 'form':240 'four':109 'function':227 'gas':135 'generat':143 'generic':165 'geocod':140 'host':32 'howev':152 'infrastructur':138 'insight':117 'key':95 'know':255 'label':58,169 'lack':248 'land':183 'learn':120 'limit':98 'list':147 'live':236 'll':258 'lowpaymentfee' 'lowpaymentfee.com':31 'machin':119 'make':251 'map':173 'metric':113 'name':178 'network':51 'no-api-key' 'on-chain':89 'on-chain API access' 'openapi':215 'oper':245 'page':184,195 'particular':229 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'pay-per-use' 'payment':46,65,86,261 'per':3,18,38,84,150 'per-request-billing' 'platform':105 'premium':5,20,59,166 'price':129 'prompt':202 'protocol':47 'purpos':158 'quot':134 'rate':97,132 'receiv':259 'render':197 'report':114 'request':39,85,151 'request/response':218 'requir':63,102 'return':231 'schema':208,219 'sentiment':121 'settl':88 'spec':216 'specif':53,154 'subscript':101 'summar':124 'technic':206 'text':123 'thin':188 'token':133 'unit':72 'usag':210 'usdc':15,30,74 'usdc-settlement' 'util':139 'valid':141 'via':10,25,43 'wallet':201 'web3':128 'well':239 'well-form':238 'x402':11,26,45,233 'x402 API' 'x402-payment'","prices":[{"id":"c1617451-7738-473f-92c0-ade77d6b6f92","listingId":"afcc2aa5-2a65-4408-95df-b7e59da9c63f","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/payments/199","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:54.157Z"}],"sources":[{"listingId":"afcc2aa5-2a65-4408-95df-b7e59da9c63f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/199","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:54.157Z","lastSeenAt":"2026-04-23T16:07:16.665Z"}],"details":{"listingId":"afcc2aa5-2a65-4408-95df-b7e59da9c63f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/199 \\\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 x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/199"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints in Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /api, /pricing, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API data without creating an account or managing API keys","Making one-off paid API calls settled in USDC on Base","Agent-driven workflows that need frictionless pay-per-request access"],"bestFor":["Developers who want zero-signup, pay-as-you-go API access","AI agents with x402-compatible wallets on Base","Users who prefer on-chain micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume consumers who want bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.592Z"},"updatedAt":"2026-04-23T16:07:16.665Z"}}