{"id":"70b3bf15-aa37-46fd-b2ef-eabb745a83b5","shortId":"6DJnF7","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 provides \"Premium API Access\" via the x402 payment protocol. The specific path `/api/v1/inbox/152` is one of many endpoints offered by the provider, which advertises a broad catalog 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, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe x402 challenge for this specific endpoint shows a `maxAmountRequired` of 20000 base units of USDC (contract `0x8335…2913` on Base, 6 decimals), which equals $0.02 — consistent with the site's advertised pricing. The endpoint accepts POST requests and returns `application/json`. Payment is settled on-chain to `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` with a 300-second timeout.\n\nNote that the specific functionality behind `/api/v1/inbox/152` is not documented on the provider's landing page — the \"inbox\" path does not appear in the listed API catalog. It may be a mailbox-style endpoint or an unlisted resource. Without further documentation or an OpenAPI schema, the exact input/output contract for this particular path is unknown. The provider's site pages beyond the landing page (pricing, README, api) all resolve to a minimal \"Connect wallet\" prompt with no additional documentation.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","post-method","no-api-key","no-rate-limit"],"categories":["api","misc"],"synonyms":["premium API","pay-per-call API","x402 endpoint","USDC micropayment API","lowpaymentfee","Base network API","inbox API"],"warnings":["The path /api/v1/inbox/152 does not appear in the provider's listed API catalog — its purpose is undocumented.","No OpenAPI schema, request format, or response examples are available for this endpoint.","Provider documentation pages (/pricing, /README, /api) return only a 'Connect wallet' prompt with no content.","The exact functionality behind 'Premium API Access' at this path is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/152","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/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation for the specific /inbox/152 path, no request/response examples, and the provider's docs pages are empty. The endpoint's actual functionality is 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'/request':13,28 '0.02':12,27,95,141 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':164 '0x8335':133 '20000':127 '2913':134 '300':167 '6':137 'Base network API' 'USDC micropayment API' 'accept':151 'access':7,22,38 'addit':248 'advertis':58,147 'ai':65 'analysi':69 'analyt':64 'api':6,21,37,107,195,237 'appear':191 'application/json':156 'base':9,24,103,128,136 'behind':175 'beyond':231 'broad':60 'call':4,19 'catalog':61,196 'chain':162 'challeng':118 'classif':71 'commit':115 'connect':243 'consist':142 'contract':132,219 'convers':88 'data':63 'decim':138 'document':179,211,249 'embed':72 'endpoint':32,52,91,122,150,204 'equal':140 'estim':82 'exact':217 'exchang':77 'feed':76 'financ':73 'function':174 'gas':81 'generat':89 'geocod':86 'inbox':187 'inbox API' 'infrastructur':84 'input/output':218 'json-api' 'key':108 'land':184,233 'learn':67 'limit':111 'list':194 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mailbox':202 'mailbox-styl':201 'mani':51 'maxamountrequir':125 'may':198 'minim':242 'minimum':114 'network':104 'no-api-key' 'no-rate-limit' 'note':170 'offer':53 'on-chain':160 'one':49 'openapi':214 'page':185,230,234 'particular':222 'path':46,188,223 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':98 'payment':42,157 'per':3,18,96 'post':152 'post-method' 'premium':5,20,36 'premium API' 'price':75,93,148,235 'prompt':245 'protocol':43 'provid':35,56,182,227 'quot':80 'rate':78,110 'readm':236 'request':97,153 'resolv':239 'resourc':208 'return':155 'schema':215 'second':168 'sentiment':68 'settl':159 'show':123 'site':145,229 'span':62 'specif':45,121,173 'style':203 'summar':70 'timeout':169 'token':79 'unit':129 'unknown':225 'unlist':207 'usdc':15,30,100,131 'usdc-base' 'util':85 'valid':87 'via':10,25,39 'wallet':244 'web3':74 'without':209 'x402':11,26,41,117 'x402 endpoint' 'x402-payment'","prices":[{"id":"7e89752b-2b4e-4326-a740-4198de4262d9","listingId":"70b3bf15-aa37-46fd-b2ef-eabb745a83b5","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/152","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:20.370Z"}],"sources":[{"listingId":"70b3bf15-aa37-46fd-b2ef-eabb745a83b5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/152","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:20.370Z","lastSeenAt":"2026-04-22T01:02:14.808Z"}],"details":{"listingId":"70b3bf15-aa37-46fd-b2ef-eabb745a83b5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/152 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"The provider offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories.","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/inbox/152"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment flows with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","AI agents that need keyless, pay-as-you-go API access","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need well-documented, schema-defined API contracts","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:09.142Z"},"updatedAt":"2026-04-22T01:02:14.808Z"}}