{"id":"452c7d8f-4626-4023-95bd-1688901d7479","shortId":"GZ6ETk","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific endpoint `/api/v1/charges/61` accepts POST requests and charges up to $0.02 per call in USDC (USD Coin), settled on-chain via the x402 exact payment scheme. No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises a suite of endpoints spanning 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 listed at $0.02 per request. However, the specific functionality behind `/api/v1/charges/61` (labeled only \"Premium API Access\") is not documented in detail — there is no OpenAPI schema, no request/response examples, and the crawled docs, pricing, and API pages returned only a wallet-connect prompt with no additional content.\n\nThe endpoint is confirmed live: the probe received a proper HTTP 402 challenge with x402 version 1 headers. Payment is directed to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC on Base (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`). The maximum amount required is 20,000 base units, which equals $0.02 (USDC uses 6 decimals). Timeout is 300 seconds.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-request-billing","no-api-key","post-endpoint"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","402 payment required"],"warnings":["The exact functionality behind /api/v1/charges/61 ('Premium API Access') is not documented anywhere in the crawled material.","All documentation, pricing, API, and README pages returned only a 'Connect wallet' prompt with no substantive content.","No OpenAPI spec, request schema, or response schema is available.","The broader platform lists many endpoints but none have documented input/output contracts."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/61","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/charges/61","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 with a valid x402 402 challenge, and pricing is clear ($0.02 USDC on Base). However, the specific functionality of /api/v1/charges/61 is undocumented — no OpenAPI schema, no request/response examples, and all docs pages returned only a wallet-connect stub. The listing is effectively a stub with confirmed 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'0.02':56,143,229 '000':224 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':212 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':217 '1':205 '20':223 '300':236 '402':200 '402 payment required' '6':232 'Base network API' 'USDC API access' 'accept':49 'access':6,20,36,156 'addit':187 'address':211 'advertis':99 'ai':112 'amount':220 'analysi':116 'analyt':106 'api':5,19,35,74,155,176 'attach':83 'base':8,22,43,216,225 'behind':37,150 'broader':96 'call':58 'caller':81 'chain':66 'challeng':201 'charg':53 'classif':119 'coin':62 'confirm':192 'connect':183 'content':188 'convers':136 'crawl':172 'data':105,109 'decim':233 'detail':161 'direct':209 'doc':173 'document':159 'embed':120 'endpoint':30,47,103,139,190 'equal':228 'estim':130 'exact':70 'exampl':169 'exchang':125 'export':110 'feed':124 'financ':121 'function':149 'gas':129 'gate':3,17 'generat':137 'geocod':134 'header':88,206 'howev':146 'http':199 'infrastructur':132 'insight':111 'key':75 'label':152 'learn':114 'limit':78 'list':141 'live':193 'lowpaymentfee' 'lowpaymentfee.com':32,97 'machin':113 'maximum':219 'metric':107 'micropayment API' 'network':44 'no-api-key' 'on-chain':64 'openapi':165 'page':177 'paid':9,23 'pay-per-call API' 'payment':71,87,93,207 'paywal':40 'per':11,25,57,144 'per-request':10,24 'per-request-billing' 'platform':98 'post':50 'post-endpoint' 'premium':4,18,34,154 'price':123,174 'probe':195 'prompt':184 'proof':94 'proper':198 'provid':33 'quot':128 'rate':77,126 'receiv':196 'report':108 'request':12,26,51,145 'request/response':168 'requir':80,221 'return':178 'schema':166 'scheme':72 'second':237 'sentiment':115 'settl':63 'simpli':82 'span':104 'specif':46,148 'suit':101 'summar':118 'text':117 'timeout':234 'token':127 'unit':226 'usd':61 'usdc':14,28,60,214,230 'usdc-on-base' 'use':213,231 'util':133 'valid':91,135 'version':204 'via':67 'wallet':182 'wallet-connect':181 'web3':122 'x':86 'x-payment':85 'x402':2,16,39,69,92,203 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"5f5804c3-608f-42bc-89e1-56ee3f70b366","listingId":"452c7d8f-4626-4023-95bd-1688901d7479","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/charges/61","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:34.453Z"}],"sources":[{"listingId":"452c7d8f-4626-4023-95bd-1688901d7479","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:34.453Z","lastSeenAt":"2026-04-23T22:02:13.209Z"}],"details":{"listingId":"452c7d8f-4626-4023-95bd-1688901d7479","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/61 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns HTTP 402 with x402 version 1 challenge on POST","source_url":"https://lowpaymentfee.com/api/v1/charges/61"},{"claim":"maxAmountRequired is 20000 base units of USDC on Base (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/61"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/charges/61"}],"useCases":["Programmatic access to a premium API endpoint without managing API keys or subscriptions","Agent-driven workflows that need on-chain per-request payment via x402","Testing x402 payment flows on Base with low-cost USDC transactions"],"bestFor":["Developers experimenting with x402 payment protocol on Base","AI agents that can autonomously pay for API calls with USDC","Users who want pay-per-use access without signup or rate limits"],"notFor":["Users who need detailed documentation or known response schemas before integrating","High-volume consumers seeking bulk pricing or subscription discounts","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.107Z"},"updatedAt":"2026-04-23T22:02:13.209Z"}}