{"id":"49b5eac7-85a1-4259-bb30-57b338d93f41","shortId":"WQDsAM","kind":"x402","title":"x402-gated premium API access on Base, paid per-call in USDC.","tagline":"x402-gated premium API access on Base, paid per-call in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site advertises a broad suite of API categories — data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and instant access via USDC payments on Base.\n\nThe specific endpoint `/api/v1/charges/8` returns a valid x402 challenge (version 1, scheme \"exact\") requesting up to 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. Payment is sent to address 0x1A2B…85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nHowever, the exact functionality behind this particular `/charges/8` route is unclear. The site's landing page lists many endpoints across different domains (sentiment analysis, summarization, geocoding, price feeds, etc.), but none of them map directly to `/api/v1/charges/8`. No OpenAPI spec, detailed documentation, or example request/response payloads were found — the docs, pricing, and README pages all rendered only a \"Connect wallet\" prompt with no substantive content. Without knowing what this specific endpoint returns, callers should treat it as an opaque premium resource.","tags":[],"capabilities":["x402-payment","usdc-on-base","per-call-pricing","json-response","http-post"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC API access","Base network API","lowpaymentfee","micropayment API","402 payment endpoint"],"warnings":["The specific functionality of /api/v1/charges/8 is unknown — it does not correspond to any endpoint listed on the site's landing page.","Documentation pages (/docs, /pricing, /README, /api) contain no substantive content beyond a 'Connect wallet' prompt.","No OpenAPI spec or request/response schema is available.","The site lists many endpoints across diverse categories but provides no detailed docs for any of them."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/8","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/8","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, but the actual functionality behind /api/v1/charges/8 is undocumented. No OpenAPI spec, no example requests/responses, and the docs pages are empty. The listing is effectively a stub with only pricing and protocol details 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'/charges/8':143 '0.02':67,113 '000':102 '0x1a2b':121 '0x8335':107 '1':95 '20':101 '2913':108 '300':125 '402 payment endpoint' '6':111 '85f3':122 'Base network API' 'USDC API access' 'accept':130 'access':6,20,36,79 'across':155 'address':120 'advertis':47 'ai':56 'analysi':159 'analyt':55 'api':5,19,35,52,72 'application/json':135 'base':8,22,43,84,103,110 'behind':37,140 'broad':49 'call':12,26,115 'caller':208 'categori':53 'challeng':93 'connect':194 'content':200 'data':54 'decim':112 'detail':176 'differ':156 'direct':170 'doc':185 'document':177 'domain':157 'endpoint':30,87,129,154,206 'etc':164 'exact':97,138 'exampl':179 'feed':163 'financ':59 'found':183 'function':139 'gate':3,17 'geocod':161 'howev':136 'http':131 'http-post' 'infrastructur':62 'instant':78 'json-response' 'key':73 'know':202 'land':150 'learn':58 'limit':76 'list':152 'lowpaymentfee' 'lowpaymentfee.com':32 'machin':57 'mani':153 'map':169 'micropayment API' 'network':44 'none':166 'opaqu':214 'openapi':174 'page':151,189 'paid':9,23 'particular':142 'pay-per-call API' 'payload':181 'payment':82,116 'paywal':40 'per':11,25,68,114 'per-cal':10,24 'per-call-pricing' 'post':132 'premium':4,18,34,215 'price':65,162,186 'prompt':196 'provid':33 'rate':75 'readm':188 'render':191 'request':69,98 'request/response':180 'resourc':216 'return':89,134,207 'rout':144 'scheme':96 'second':126 'sent':118 'sentiment':158 'site':46,148 'spec':175 'specif':86,205 'substant':199 'suit':50 'summar':160 'timeout':127 'treat':210 'unclear':146 'unit':104 'usdc':14,28,81,106 'usdc-on-base' 'util':63 'valid':91 'version':94 'via':80 'wallet':195 'web3':60 'without':201 'x402':2,16,39,92 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"b607d59a-ce8e-4543-b094-689a0538c239","listingId":"49b5eac7-85a1-4259-bb30-57b338d93f41","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/8","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:35.625Z"}],"sources":[{"listingId":"49b5eac7-85a1-4259-bb30-57b338d93f41","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/8","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:35.625Z","lastSeenAt":"2026-04-22T10:01:45.310Z"}],"details":{"listingId":"49b5eac7-85a1-4259-bb30-57b338d93f41","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/8 \\\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 endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/8"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/8"},{"claim":"Site advertises $0.02 per request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Site lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a premium API resource paid per-call in USDC on Base","Agent-driven workflows that need keyless, pay-as-you-go API consumption","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that can settle USDC on Base for per-call API access","Low-friction API consumption without API key management"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet","High-volume use cases where per-call crypto payments add unacceptable latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.107Z"},"updatedAt":"2026-04-22T10:01:45.310Z"}}