{"id":"0ea0e021-c0e1-4d38-b294-b79b3c503e1b","shortId":"PUFSMe","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no API keys required.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol on the Base network. It is one of many endpoints offered by the platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request paid in USDC (USD Coin) on Base.\n\nThe specific endpoint `/api/v1/payments/63` is listed under the title \"Premium API Access\" but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires an on-chain USDC payment of up to 20,000 base units (i.e., $0.02, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json`.\n\nThe platform advertises a simple pay-per-use model with no API keys, no rate limits, no minimums, and instant access. However, documentation is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no substantive content. There is no OpenAPI spec, no request/response schema documentation, and no examples of what this particular endpoint returns. The platform hosts sibling endpoints for sentiment analysis, text summarization, geocoding, price feeds, and more, but the role of `/api/v1/payments/63` specifically is unclear.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response","post-method"],"categories":["general","api-gateway"],"synonyms":["premium API","lowpaymentfee","x402 API","USDC API access","Base network API","pay-per-call API","micropayment API"],"warnings":["The exact functionality of /api/v1/payments/63 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The endpoint path '/api/v1/payments/63' does not match any of the listed API categories on the homepage, making its purpose unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/63","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response examples, and the specific purpose of /api/v1/payments/63 is undocumented. The docs/pricing/README pages are all blank beyond a wallet-connect 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'0.02':10,28,80,138 '000':134 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':147 '20':133 '6':142 'Base network API' 'USDC API access' 'accept':119 'access':6,24,44,101,175 'address':146 'advertis':156 'ai':68 'analysi':224 'analyt':67 'api':5,16,23,34,43,100,166,183 'application/json':153 'base':8,26,52,89,135 'beyond':109 'categori':76 'chain':127 'challeng':114 'coin':87 'confirm':115 'connect':192 'content':198 'data':66 'decim':143 'doc':182 'document':108,177,207 'endpoint':38,59,92,215,221 'exact':104 'exampl':210 'extrem':179 'feed':229 'financ':71 'function':105 'gate':3,21 'geocod':227 'host':219 'howev':176 'i.e':137 'infrastructur':74 'instant':174 'json-response' 'key':17,35,167 'label':111 'learn':70 'limit':170 'list':95 'live':118 'lowpaymentfee' 'lowpaymentfee.com':40 'machin':69 'mani':58 'micropayment API' 'mime':150 'minimum':172 'model':163 'network':53 'no-api-key' 'offer':60 'on-chain':125 'one':56 'openapi':202 'page':187 'paid':83 'particular':214 'pay':9,27,160 'pay-per-call API' 'pay-per-request' 'pay-per-us':159 'payment':48,129 'per':11,29,81,161 'platform':63,155,218 'post':120 'post-method' 'premium':4,22,42,99 'premium API' 'price':78,184,228 'prompt':194 'protocol':49 'provid':41 'rate':169 'readm':186 'render':189 'request':12,30,82,121 'request/response':205 'requir':18,36,123 'respons':149 'return':216 'role':234 'schema':206 'sentiment':223 'sibl':220 'simpl':158 'sinc':139 'span':65 'spars':180 'spec':203 'specif':91,237 'substant':197 'summar':226 'text':225 'titl':98 'type':151 'unclear':239 'unit':136 'usd':86 'usdc':14,32,85,128,140 'usdc-base' 'use':141,162 'util':75 'via':45 'wallet':193 'web3':72 'x402':2,20,47,113 'x402 API' 'x402-gated':1,19 'x402-payment'","prices":[{"id":"97a01c76-3c99-4819-860b-2853cab6e5ce","listingId":"0ea0e021-c0e1-4d38-b294-b79b3c503e1b","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/63","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:50.167Z"}],"sources":[{"listingId":"0ea0e021-c0e1-4d38-b294-b79b3c503e1b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/63","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:50.167Z","lastSeenAt":"2026-04-22T07:01:11.795Z"}],"details":{"listingId":"0ea0e021-c0e1-4d38-b294-b79b3c503e1b","quickStartSnippet":"# The endpoint requires an x402 payment header. Using curl as illustration:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/63 \\\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 platform lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all priced at $0.02 per request.","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises no API keys, no rate limits, instant access, and Base network settlement.","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge confirms the endpoint is live, accepts POST, requires up to 20000 base units of USDC on Base (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913).","source_url":"https://lowpaymentfee.com/api/v1/payments/63"},{"claim":"Docs, API, pricing, and README pages all render only 'Connect wallet' with no documentation content.","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing a pay-per-use API endpoint without needing to register or manage API keys","Making programmatic payments for API calls using USDC on Base","Integrating x402-compatible agents with low-cost API services"],"bestFor":["Developers wanting zero-friction, keyless API access via crypto micropayments","AI agents that support the x402 payment protocol on Base","Users who prefer pay-as-you-go pricing with no subscriptions"],"notFor":["Users who need detailed API documentation or schemas before integrating","Anyone without a Base-compatible USDC wallet","Use cases requiring guaranteed SLAs or support contracts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.926Z"},"updatedAt":"2026-04-22T07:01:11.795Z"}}