{"id":"97e73ea3-57e9-49f9-b12e-3108b08a861e","shortId":"eNXdXL","kind":"x402","title":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) offering data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that provides a broad catalog of pay-per-request endpoints settled in USDC on the Base network. The specific endpoint `/api/v1/inbox/61` is listed as \"Premium API Access\" and costs up to $0.02 per request (20,000 base units of USDC with 6 decimals). No API keys, rate limits, or subscriptions are required — callers simply attach an x402 payment header to each request.\n\nThe wider platform advertises four endpoint categories: 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 listed endpoints share the same $0.02/request pricing.\n\nNote that the specific functionality behind `/api/v1/inbox/61` is not documented beyond the generic \"Premium API Access\" label. There is no OpenAPI schema, no request/response examples, and the crawled docs pages (pricing, README, API) all resolve to a minimal \"Connect wallet\" prompt with no additional detail. Prospective callers should be aware that the actual behavior of this endpoint is unclear from available documentation.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","http-post"],"categories":["api-platform","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","USDC pay-per-call","Base network API","micropayment API","402 payment API"],"warnings":["No documentation exists for the specific endpoint /api/v1/inbox/61 — its actual functionality is unknown.","No OpenAPI or JSON schema is provided for request or response formats.","The crawled /pricing, /README, and /api pages all returned only a 'Connect wallet' prompt with no useful content.","The 'inbox' path segment suggests this may be a mailbox or messaging endpoint, but this is speculative."],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/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/inbox/61","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/61 actually does. The \"Premium API Access\" label is entirely generic. This is effectively a stub 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'/request':19,38,157 '0.02':18,37,79,156 '000':83 '20':82 '402 payment API' '6':89 'Base network API' 'USDC pay-per-call' 'access':74,174 'actual':211 'addit':202 'advertis':113 'ai':12,31,124 'analysi':128 'analyt':118 'api':5,24,45,73,92,173,191 'attach':102 'avail':219 'awar':208 'base':8,27,63,84 'base-network' 'behavior':212 'behind':164 'beyond':169 'broad':50 'call':4,23 'caller':100,205 'catalog':51 'categori':116 'classif':131 'connect':197 'convers':148 'cost':76 'crawl':186 'data':11,30,117,121 'decim':90 'detail':203 'doc':187 'document':168,220 'embed':132 'enabl':44 'endpoint':16,35,57,67,115,152,215 'estim':142 'exampl':183 'exchang':137 'export':122 'feed':136 'financ':13,32,133 'four':114 'function':163 'gas':141 'generat':149 'generic':171 'geocod':146 'header':106 'http-post' 'infrastructur':144 'insight':123 'key':93 'label':175 'learn':126 'limit':95 'list':70,151 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':125 'metric':119 'micropayment API' 'minim':196 'network':64 'no-api-key' 'note':159 'offer':10,29 'openapi':179 'page':188 'pay':2,21,54 'pay-per-cal':1,20 'pay-per-request':53 'payment':105 'per':3,22,55,80 'platform':6,25,46,112 'premium':72,172 'price':135,158,189 'prompt':199 'prospect':204 'provid':48 'quot':140 'rate':94,138 'readm':190 'report':120 'request':56,81,109 'request/response':182 'requir':99 'resolv':193 'schema':180 'sentiment':127 'settl':58 'share':153 'simpli':101 'specif':66,162 'subscript':97 'summar':130 'text':129 'token':139 'unclear':217 'unit':85 'usdc':9,28,60,87 'usdc-settlement' 'util':15,34,145 'valid':147 'wallet':198 'web3':134 'wider':111 'x402':43,104 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"fae89152-4a58-49dc-934f-114a15a92c17","listingId":"97e73ea3-57e9-49f9-b12e-3108b08a861e","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/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":"2026-04-21T18:32:21.946Z"}],"sources":[{"listingId":"97e73ea3-57e9-49f9-b12e-3108b08a861e","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/61","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.946Z","lastSeenAt":"2026-04-22T11:32:57.765Z"}],"details":{"listingId":"97e73ea3-57e9-49f9-b12e-3108b08a861e","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/61 \\\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":"The endpoint returns a 402 challenge requesting up to 20,000 base units of USDC (asset 0x8335…) on Base network.","source_url":"https://lowpaymentfee.com/api/v1/inbox/61"},{"claim":"All listed 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 platform offers endpoints in four categories: Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure.","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to premium API services without subscription or API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment-gated APIs","AI agents that need frictionless pay-per-call access without credentials","Low-volume or sporadic API consumers who want no commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.125Z"},"updatedAt":"2026-04-22T11:32:57.765Z"}}