{"id":"f75b9fe9-3efd-4688-a879-286cb6d801e9","shortId":"e2sjd2","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/179` is one of many endpoints offered by the provider, which hosts a broad catalog spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, paid in USDC on the Base network.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain using USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe specific functionality behind `/api/v1/inbox/179` is not documented beyond the generic label \"Premium API Access.\" The provider's landing page lists other endpoints (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation), but this particular inbox path does not appear among them. Without further documentation or an OpenAPI schema, the exact input/output contract for this endpoint is unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","post-endpoint","no-api-key"],"categories":["api-marketplace","infrastructure"],"synonyms":["lowpaymentfee","x402 api","pay per call api","micropayment api","usdc api access","base network api"],"warnings":["The specific endpoint /api/v1/inbox/179 is not listed among the provider's documented APIs — its exact functionality is unknown.","No OpenAPI schema, request/response examples, or detailed documentation are available.","The /api, /pricing, and /README pages returned only a 'Connect wallet' prompt with no useful content."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/179","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/179","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 confirmed) and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documentation for this specific path, no example request/response, and the purpose of /api/v1/inbox/179 is entirely opaque. The listing is effectively a 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'/request':13,28 '0.02':12,27,76,121 '000':117 '0x8335':107 '20':116 '2913':108 '6':125 'accept':95 'access':7,22,38,167 'ai':65 'among':200 'amount':114 'analysi':179 'analyt':64 'api':6,21,37,130,166 'appear':199 'attach':141 'base':9,24,84,110,118 'base network api' 'behind':156 'beyond':161 'broad':60 'call':4,19 'caller':139 'catalog':61 'chain':103 'challeng':88 'classif':181 'commit':138 'confirm':89 'contract':106,212 'convers':189 'data':63 'decim':126 'document':160,204 'embed':182 'endpoint':32,52,91,175,215 'exact':210 'exchang':185 'feed':184 'financ':68 'function':155 'generat':191 'generic':163 'geocod':187 'given':122 'header':146 'host':58 'i.e':120 'inbox':195 'infrastructur':71 'input/output':211 'key':131 'label':164 'land':171 'learn':67 'limit':134 'list':173 'live':93 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':66 'mani':51 'maximum':113 'metric':176 'micropayment api' 'minimum':137 'network':85 'no-api-key' 'offer':53 'on-chain':101 'one':49 'openapi':207 'page':172 'paid':79 'particular':194 'path':46,196 'pay':2,17 'pay per call api' 'pay-per-cal':1,16 'pay-per-request' 'payment':42,98,145,151 'per':3,18,77 'post':96 'post-endpoint' 'premium':5,20,36,165 'price':74,183 'proof':152 'protocol':43 'provid':35,56,169 'rate':133,186 'report':177 'request':78,97 'schema':208 'sentiment':178 'settl':100 'simpli':140 'span':62 'specif':45,154 'summar':180 'unit':119 'unknown':217 'usdc':15,30,81,105,123 'usdc api access' 'usdc-base' 'use':104 'util':72 'valid':149,188 'via':10,25,39 'web3':69 'without':202 'x':144 'x-payment':143 'x402':11,26,41,87,150 'x402 api' 'x402-payment'","prices":[{"id":"8f6ff4ea-696a-47ae-a965-f354d0b39ff1","listingId":"f75b9fe9-3efd-4688-a879-286cb6d801e9","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/179","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.769Z"}],"sources":[{"listingId":"f75b9fe9-3efd-4688-a879-286cb6d801e9","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/179","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.769Z","lastSeenAt":"2026-04-22T04:02:46.194Z"}],"details":{"listingId":"f75b9fe9-3efd-4688-a879-286cb6d801e9","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/179 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The provider lists endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns 402 with maxAmountRequired 20000 in USDC (6 decimals) on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/179"}],"useCases":["Agent-driven API consumption with per-call crypto payments","Accessing premium data or utility endpoints without API key registration","Programmatic pay-as-you-go service consumption on Base L2"],"bestFor":["Developers or agents wanting zero-signup, pay-per-call API access","Users who prefer on-chain USDC micropayments over subscription billing","Automated workflows that need instant, keyless endpoint access"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk/subscription pricing","Anyone unable to transact in USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:51.943Z"},"updatedAt":"2026-04-22T04:02:46.194Z"}}