{"id":"58b50084-b67c-4f0a-968d-99c283a9c826","shortId":"HZXX25","kind":"x402","title":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","tagline":"Pay-per-request premium API access on Base via x402 — $0.02/call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/payments/375` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nPayment is settled on the Base network using USDC (contract 0x8335…2913) through the x402 exact-payment scheme. The endpoint accepts POST requests, requires no API keys or accounts, and has no advertised rate limits. The maximum payment timeout is 300 seconds. The x402 challenge was successfully captured, confirming the endpoint is live.\n\nThe specific functionality behind the `/api/v1/payments/375` path is not documented beyond the label \"Premium API Access.\" The provider's landing page lists other endpoints with clearer descriptions (metrics, sentiment analysis, geocoding, etc.), but this particular path lacks detailed documentation about its input/output schema or what data it returns. The docs, pricing, and API pages behind the site all require a wallet connection and yield no further content.","tags":[],"capabilities":["x402-payment","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint"],"categories":["api","payments"],"synonyms":["premium api","pay per call api","x402 api","micropayment api","USDC api access","low fee api","base network api"],"warnings":["The specific functionality of /api/v1/payments/375 is not documented; 'Premium API Access' is the only description available.","All documentation pages (docs, pricing, API, README) require a wallet connection and provide no readable content.","No OpenAPI spec, input schema, or output schema is available for this endpoint.","The provider lists many other endpoints on its landing page, but it is unclear how they relate to this specific path."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/375","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/375","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 pricing is clear ($0.02 USDC on Base), but the specific endpoint's functionality is undocumented — no input/output schema, no examples, and all doc pages require wallet connection with no rendered content. The listing is effectively a stub with confirmed 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'/call':13,28 '0.02':12,27,76 '0x8335':89 '2913':90 '300':120 'USDC api access' 'accept':100 'access':7,22,38,148 'account':108 'advertis':112 'ai':65 'analysi':162 'analyt':64 'api':6,21,37,105,147,185 'base':9,24,84 'base network api' 'base-network' 'behind':136,187 'beyond':143 'broad':60 'captur':127 'catalog':61 'challeng':124 'clearer':158 'confirm':128 'connect':194 'content':199 'contract':88 'data':63,178 'descript':159 'detail':170 'doc':182 'document':142,171 'endpoint':32,52,99,130,156 'etc':164 'exact':95 'exact-pay':94 'financ':68 'function':135 'geocod':163 'host':58 'infrastructur':71 'input/output':174 'key':106 'label':145 'lack':169 'land':152 'learn':67 'limit':114 'list':154 'live':132 'low fee api' 'lowpaymentfee.com':34 'machin':66 'mani':51 'maximum':116 'metric':160 'micropayment api' 'network':85 'no-api-key' 'offer':53 'one':49 'page':153,186 'particular':167 'path':46,139,168 'pay':2,17 'pay per call api' 'pay-per-request':1,16 'payment':42,79,96,117 'per':3,18,77 'post':101 'post-endpoint' 'premium':5,20,36,146 'premium api' 'price':74,183 'protocol':43 'provid':35,56,150 'rate':113 'request':4,19,78,102 'requir':103,191 'return':180 'schema':175 'scheme':97 'second':121 'sentiment':161 'settl':81 'site':189 'span':62 'specif':45,134 'success':126 'timeout':118 'usdc':15,30,87 'usdc-settlement' 'use':86 'util':72 'via':10,25,39 'wallet':193 'web3':69 'x402':11,26,41,93,123 'x402 api' 'x402-payment' 'yield':196","prices":[{"id":"e0fedf24-1db2-4353-a609-01a222601bd5","listingId":"58b50084-b67c-4f0a-968d-99c283a9c826","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/375","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:36.202Z"}],"sources":[{"listingId":"58b50084-b67c-4f0a-968d-99c283a9c826","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/375","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:36.202Z","lastSeenAt":"2026-04-22T09:01:19.150Z"}],"details":{"listingId":"58b50084-b67c-4f0a-968d-99c283a9c826","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/375 \\\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":"Endpoint returns 402 with x402 challenge confirming it is live on Base network using USDC","source_url":"https://lowpaymentfee.com/api/v1/payments/375"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/payments/375"},{"claim":"Provider advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/375"}],"useCases":["Programmatic access to a premium API endpoint with per-request USDC micropayments","Agent-driven workflows that need keyless, pay-as-you-go API access on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers exploring x402 pay-per-request patterns","AI agents that can settle USDC payments on Base autonomously","Users who want no-signup, no-API-key access to paid endpoints"],"notFor":["Users needing detailed documentation or guaranteed SLAs before integrating","Anyone looking for free or fiat-only payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:06.608Z"},"updatedAt":"2026-04-22T09:01:19.150Z"}}