{"id":"ffbaddd0-c2e0-414e-ab77-a3852be30a7a","shortId":"gDLW86","kind":"x402","title":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","tagline":"x402-gated premium API access on Base, pay $0.02 per request in USDC — no keys, no rate limits.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The site hosts a broad catalog of pay-per-call APIs spanning data & analytics, AI & machine learning (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request, settled in USDC on Base.\n\nThe specific endpoint `/api/v1/inbox/68` is listed as \"Premium API Access\" with a maximum payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme — callers attach an X-PAYMENT header with a signed payment to the payTo address. No API keys are required, there are no stated rate limits, and access is instant once payment is included.\n\nNote that the endpoint path `/api/v1/inbox/68` does not clearly map to any of the named API categories on the site's landing page (analytics, AI, finance, infrastructure). The crawled documentation is extremely thin — the /api, /pricing, and /README pages all returned only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no documentation describing what this specific inbox endpoint accepts or returns. Treat this as a low-documentation endpoint where the actual functionality behind the paywall is uncertain.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","json-response"],"categories":["api-gateway","infrastructure"],"synonyms":["lowpaymentfee","x402 api","pay-per-call api","USDC micropayment api","Base network api","premium api access","micro-payment endpoint"],"warnings":["No documentation available for /api/v1/inbox/68 — the endpoint's actual functionality is unknown","No OpenAPI schema or request/response examples provided","The /api, /pricing, and /README pages returned only 'Connect wallet' with no useful content","The path '/api/v1/inbox/68' does not correspond to any named API on the site's landing page"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/68","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/inbox/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/inbox/68 actually does. The 'Premium API Access' label is generic and the inbox path doesn't match any documented API category. Effectively a stub 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'/api/v1/inbox/68':111,185 '/pricing':215 '/readme':217 '0.02':10,29,100,137 '000':124 '0x8335':129 '20':123 '2913':130 '6':133 'Base network api' 'USDC micropayment api' 'accept':247 'access':6,25,46,117,173 'actual':260 'address':160 'ai':70,204 'analysi':74 'analyt':69,203 'api':5,24,45,66,116,162,195 'attach':147 'base':8,27,53,107,125,132 'base-network' 'behind':47,262 'broad':59 'call':65 'caller':146 'catalog':60 'categori':196 'classif':76 'clear':188 'connect':223 'content':229 'convers':93 'crawl':208 'data':68 'decim':134 'describ':241 'document':209,240,256 'embed':77 'endpoint':40,96,110,183,246,257 'equal':136 'estim':87 'exact':144 'exampl':237 'exchang':82 'extrem':211 'feed':81 'financ':78,205 'function':261 'gas':86 'gate':3,22 'generat':94 'geocod':91 'header':152 'host':57 'inbox':245 'includ':179 'infrastructur':89,206 'instant':175 'json-response' 'key':16,35,163 'land':201 'learn':72 'limit':19,38,171 'list':113 'low':255 'low-document':254 'lowpaymentfee' 'lowpaymentfee.com':42 'machin':71 'made':140 'map':189 'maximum':120 'micro-payment endpoint' 'name':194 'network':54 'no-api-key' 'note':180 'openapi':233 'page':202,218 'path':184 'pay':9,28,63 'pay-per-cal':62 'pay-per-call api' 'pay-per-request' 'payment':121,138,151,156,177 'payto':159 'paywal':50,264 'per':11,30,64,101 'premium':4,23,44,115 'premium api access' 'price':80,98 'prompt':225 'provid':43 'quot':85 'rate':18,37,83,170 'request':12,31,102 'request/response':236 'requir':165 'return':220,249 'schema':234 'scheme':145 'sentiment':73 'settl':103 'sign':155 'site':56,199 'span':67 'specif':109,244 'state':169 'summar':75 'thin':212 'token':84 'treat':250 'uncertain':266 'unit':126 'usdc':14,33,105,128 'usdc-settlement' 'util':90 'valid':92 'via':141 'wallet':224 'web3':79 'x':150 'x-payment':149 'x402':2,21,49,143 'x402 api' 'x402-gated':1,20 'x402-payment'","prices":[{"id":"945736cc-a7d7-40f6-8b7f-f7f71b74af06","listingId":"ffbaddd0-c2e0-414e-ab77-a3852be30a7a","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/inbox/68","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.998Z"}],"sources":[{"listingId":"ffbaddd0-c2e0-414e-ab77-a3852be30a7a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/68","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.998Z","lastSeenAt":"2026-04-22T01:02:16.807Z"}],"details":{"listingId":"ffbaddd0-c2e0-414e-ab77-a3852be30a7a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/68 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <signed-x402-payment-header>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The site lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, instant access, on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base, equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/inbox/68"}],"useCases":["Programmatic access to a pay-per-call API without managing API keys or subscriptions","Agent-driven workflows that need to pay for API calls on-the-fly using USDC on Base","Testing x402 payment flows against a live, low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-volume consumers who want per-request billing with no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume production workloads where per-request crypto settlement overhead matters","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.122Z"},"updatedAt":"2026-04-22T01:02:16.807Z"}}