{"id":"6a5dc5e5-8a8b-4d7f-a7a5-4013449c960b","shortId":"w3wTCr","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":"This endpoint at lowpaymentfee.com is one of many x402-gated API endpoints offered by the platform. The specific resource `/api/v1/payments/384` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the site's uniform $0.02/request pricing across all endpoints.\n\nThe broader lowpaymentfee.com platform offers endpoints spanning 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 identically at $0.02 per call with no API keys, no rate limits, and no minimum commitments required.\n\nHowever, documentation 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 schema, no request/response examples, and no description of what this specific `/api/v1/payments/384` endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what data or functionality it provides beyond the generic \"Premium API Access\" label.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 api","pay per call api","usdc api access","base network api","micropayment api","lowpaymentfee","crypto api gateway"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or output schema provided; unclear what data or functionality this endpoint returns","The endpoint label 'Premium API Access' is generic and does not describe actual functionality","Cannot verify what request body is expected or what response is returned"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/384","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/384","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a generic label. The docs pages are empty (just 'Connect wallet'). It is impossible to determine what this specific endpoint actually does or 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'/request':13,28,96 '0.02':12,27,86,95,149 '000':77 '20':76 '402':214 '6':82 'accept':58 'access':7,22,56,233 'across':98 'actual':205 'advertis':72 'ai':117 'analysi':121 'analyt':111 'api':6,21,42,55,154,171,232 'base':9,24,67,78 'base network api' 'base-network' 'beyond':228 'broader':102 'call':4,19,151 'categori':109 'challeng':71,215 'classif':124 'commit':162 'connect':180 'consist':89 'convers':141 'crypto api gateway' 'data':110,114,223 'decim':83 'descript':198 'detail':187 'doc':170 'document':165,218 'embed':125 'endpoint':32,43,100,106,144,204,208 'equal':85 'estim':135 'exampl':195 'exchang':130 'export':115 'extrem':167 'feed':129 'financ':126 'four':108 'function':225 'gas':134 'gate':41 'generat':142 'generic':230 'geocod':139 'howev':164 'ident':147 'infrastructur':137 'insight':116 'key':155 'label':53,234 'learn':119 'limit':158 'live':210 'lowpaymentfee' 'lowpaymentfee.com':34,103 'machin':118 'mani':38 'maxamountrequir':74 'metric':112 'micropayment api' 'minimum':161 'network':68 'no-api-key' 'offer':44,105 'one':36 'openapi':191 'page':175 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':62 'per':3,18,87,150 'platform':47,104 'post':59 'post-method' 'premium':5,20,54,231 'price':97,128,146,172 'prompt':182 'provid':227 'quot':133 'rate':131,157 'readm':174 'render':177 'report':113 'request':60,88 'request/response':194 'requir':163 'resourc':50 'return':206,211 'schema':192 'sentiment':120 'settl':61 'site':92 'span':107 'spars':168 'specif':49,202 'summar':123 'technic':186 'text':122 'token':132 'unclear':221 'uniform':94 'unit':79 'usdc':15,30,64,81 'usdc api access' 'usdc-settlement' 'util':138 'valid':140,213 'via':10,25 'wallet':181 'web3':127 'without':217 'x402':11,26,40,70 'x402 api' 'x402-gated':39 'x402-payment'","prices":[{"id":"f058420b-c34b-4f87-88d4-eda673884a32","listingId":"6a5dc5e5-8a8b-4d7f-a7a5-4013449c960b","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/384","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:36.167Z"}],"sources":[{"listingId":"6a5dc5e5-8a8b-4d7f-a7a5-4013449c960b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/384","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:36.167Z","lastSeenAt":"2026-04-23T11:03:35.285Z"}],"details":{"listingId":"6a5dc5e5-8a8b-4d7f-a7a5-4013449c960b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/384 \\\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 advertises maxAmountRequired of 20000 base units of USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/384"},{"claim":"All 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 endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/384"}],"useCases":["Programmatic access to premium API functionality with per-call USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents needing keyless pay-per-call API access","Users who want to avoid subscription commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume use cases where per-call pricing may add up without volume discounts","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.608Z"},"updatedAt":"2026-04-23T11:03:35.285Z"}}