{"id":"96640fa0-8a15-4554-8e00-1dfe3da48c1f","shortId":"dj3z9C","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 provides \"Premium API Access\" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request and settled in USDC on the Base network. No API keys, rate limits, or upfront commitments are required; callers simply attach an x402 payment header to each request.\n\nThe specific endpoint `/api/v1/payments/361` is labeled \"Premium API Access\" in the x402 challenge. The challenge confirms it accepts USDC (contract 0x8335…2913 on Base) with a maxAmountRequired of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The endpoint accepts POST requests and returns application/json. However, there is no documentation describing what this particular endpoint actually does — the crawled docs, pricing, and README pages all returned only a \"Connect wallet\" stub with no substantive content.\n\nBecause the endpoint path (`/payments/361`) does not match any of the documented API categories (analytics, AI, finance, utils), it is unclear whether this is a standalone resource or a generic payment gateway entry point. The site's landing page lists many other endpoints but does not reference this specific path. Prospective callers should be aware that the actual functionality behind this endpoint is undocumented.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","402 payment protocol","crypto API access"],"warnings":["No documentation available — docs, pricing, README, and API pages all return only a 'Connect wallet' stub with no content.","The endpoint path /api/v1/payments/361 is not listed among the site's documented API categories; its actual functionality is unknown.","No request or response schema is documented; callers cannot know what to send or expect back.","No OpenAPI spec, ai-plugin manifest, or robots.txt/agents.txt found."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/361","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/361","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation about what this endpoint actually does. The docs, pricing, README, and API pages all returned empty stubs. The endpoint path does not match any listed API category. This is effectively a stub 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'/payments/361':181 '/request':13,28 '0.02':12,27,69,134 '000':129 '0x8335':120 '20':128 '2913':121 '402 payment protocol' '6':137 'Base network API' 'USDC micropayment API' 'accept':117,141 'access':7,22,38,108 'actual':157,234 'ai':58,192 'analyt':57,191 'api':6,21,37,54,81,107,189 'application/json':146 'attach':92 'awar':231 'base':9,24,78,123,130 'base-network' 'behind':236 'call':4,19 'caller':90,228 'categori':190 'challeng':112,114 'collect':48 'commit':87 'confirm':115 'connect':170 'content':176 'contract':119 'crawl':160 'crypto API access' 'data':56 'decim':138 'describ':152 'doc':161 'document':151,188 'endpoint':32,102,140,156,179,219,238 'entri':209 'equal':133 'financ':61,193 'function':235 'gateway':208 'generic':206 'header':96 'host':46 'howev':147 'infrastructur':64 'json-response' 'key':82 'label':105 'land':214 'learn':60 'limit':84 'list':216 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':59 'mani':217 'match':184 'maxamountrequir':126 'network':79 'no-api-key' 'page':165,215 'particular':155 'path':180,226 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payment':42,95,207 'per':3,18,52,70 'point':210 'post':142 'premium':5,20,36,106 'price':67,162 'prospect':227 'protocol':43 'provid':35 'rate':83 'readm':164 'refer':223 'request':53,71,99,143 'requir':89 'resourc':203 'return':145,167 'settl':73 'simpli':91 'site':45,212 'span':55 'specif':101,225 'standalon':202 'stub':172 'substant':175 'unclear':197 'undocu':240 'unit':131 'upfront':86 'usdc':15,30,75,118,135 'usdc-settlement' 'use':136 'util':65,194 'via':10,25,39 'wallet':171 'web3':62 'whether':198 'x402':11,26,41,94,111 'x402 API' 'x402-payment'","prices":[{"id":"bc7928b1-a880-4602-90e3-c1f53b468f54","listingId":"96640fa0-8a15-4554-8e00-1dfe3da48c1f","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/361","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:25.328Z"}],"sources":[{"listingId":"96640fa0-8a15-4554-8e00-1dfe3da48c1f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/361","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:25.328Z","lastSeenAt":"2026-04-23T11:03:34.869Z"}],"details":{"listingId":"96640fa0-8a15-4554-8e00-1dfe3da48c1f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/361 \\\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 in USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/361"},{"claim":"USDC contract address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/361"},{"claim":"Site advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Listed API categories include Data & Analytics, AI & ML, Finance & Web3, and Infrastructure","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to paid API endpoints without traditional API key management","Agent-driven workflows that need instant, keyless API access settled in USDC","Exploring x402 payment protocol integration for pay-per-request services"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that can attach x402 payment headers automatically","Users who want no-signup, no-rate-limit API access on Base"],"notFor":["Users who need detailed documentation or guaranteed SLAs before calling","Anyone without USDC on Base network for payment settlement","Production workloads requiring well-documented, stable API contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.148Z"},"updatedAt":"2026-04-23T11:03:34.869Z"}}