{"id":"9aa556df-fd44-45f5-8871-2378bee5931e","shortId":"2fXnyW","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 part of a broader platform offering pay-per-request APIs across data analytics, AI/ML, finance/Web3, and infrastructure categories. The specific endpoint `/api/v1/payments/186` is labeled \"Premium API Access\" and is gated by the x402 protocol on the Base network, accepting USDC payments.\n\nThe x402 challenge confirms the endpoint is live and requires a maximum of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this translates to $0.02 per request, consistent with the site's advertised flat pricing of $0.02/request across all endpoints. The platform advertises no API keys, no rate limits, and instant access — payment is the only authentication mechanism.\n\nHowever, the actual functionality behind this specific endpoint path (`/payments/186`) is unclear. The site's landing page lists endpoints under categories like Data & Analytics, AI & ML, Finance & Web3, and Infrastructure, but `/api/v1/payments/186` does not appear among them. There is no OpenAPI schema, no detailed documentation (docs/pricing/README pages all render only a \"Connect wallet\" prompt), and no example request/response payloads available. The endpoint accepts POST requests and returns `application/json`, but beyond that the input parameters and response structure are unknown.","tags":[],"capabilities":["x402-payment-gated","usdc-base-network","pay-per-request","no-api-key","json-response","http-post"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/payments/186 is undocumented and unclear — it does not match any of the listed API categories on the site.","No OpenAPI schema, example payloads, or detailed documentation available.","All documentation pages (docs, pricing, README, api) render only a 'Connect wallet' prompt with no actual content.","Input parameters and response format are completely unknown."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/186","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/186","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 challenge with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI schema, no example requests or responses, and the specific functionality of /api/v1/payments/186 is entirely unknown. The docs, pricing, and README pages are all empty beyond a wallet-connect 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'/payments/186':153 '/request':13,28,122 '0.02':12,27,109,121 '000':92 '0x8335':97 '20':91 '2913':98 '6':104 'Base network API' 'USDC micropayment API' 'accept':75,206 'access':7,22,63,137 'across':47,123 'actual':146 'advertis':117,128 'ai':168 'ai/ml':50 'among':179 'analyt':49,167 'api':6,21,46,62,130 'appear':178 'application/json':211 'authent':142 'avail':203 'base':9,24,73,93,100 'behind':148 'beyond':213 'broader':39 'call':4,19 'categori':54,164 'challeng':80 'confirm':81 'connect':195 'consist':112 'crypto-paid API' 'data':48,166 'decim':105 'detail':187 'docs/pricing/readme':189 'document':188 'endpoint':32,57,83,125,151,162,205 'exampl':200 'financ':170 'finance/web3':51 'flat':118 'function':147 'gate':66 'howev':144 'http-post' 'infrastructur':53,173 'input':216 'instant':136 'json-response' 'key':131 'label':60 'land':159 'like':165 'limit':134 'list':161 'live':85 'lowpaymentfee' 'lowpaymentfee.com':34 'maximum':89 'mechan':143 'ml':169 'network':74 'no-api-key' 'offer':41 'openapi':184 'page':160,190 'paramet':217 'part':36 'path':152 'pay':2,17,43 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':42 'payload':202 'payment':77,138 'per':3,18,44,110 'platform':40,127 'post':207 'premium':5,20,61 'premium API access' 'price':119 'prompt':197 'protocol':70 'rate':133 'render':192 'request':45,111,208 'request/response':201 'requir':87 'respons':219 'return':210 'schema':185 'sinc':101 'site':115,157 'specif':56,150 'structur':220 'translat':107 'unclear':155 'unit':94 'unknown':222 'usdc':15,30,76,96,102 'usdc-base-network' 'use':103 'via':10,25 'wallet':196 'web3':171 'x402':11,26,69,79 'x402 API' 'x402-payment-gated'","prices":[{"id":"7c7873ca-565e-4162-919d-93130a4db49f","listingId":"9aa556df-fd44-45f5-8871-2378bee5931e","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/186","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:48.606Z"}],"sources":[{"listingId":"9aa556df-fd44-45f5-8871-2378bee5931e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/186","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:48.606Z","lastSeenAt":"2026-04-23T16:07:16.387Z"}],"details":{"listingId":"9aa556df-fd44-45f5-8871-2378bee5931e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/186 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 challenge requiring 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/186"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/186"},{"claim":"Platform advertises $0.02/request flat pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Integrating pay-as-you-go API calls into agent workflows without API key management","Programmatic access to gated services settled on Base L2"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents with x402-compatible payment capabilities","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up","Users without USDC on Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.856Z"},"updatedAt":"2026-04-23T16:07:16.387Z"}}