{"id":"f0ac35d1-e094-45ef-97d9-864bbbb9d57a","shortId":"mrGMba","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/47` 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 or rate limits are advertised; callers pay per request via the x402 protocol's X-PAYMENT header.\n\nThe platform advertises four categories of APIs: 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. The x402 challenge for this particular endpoint confirms it accepts POST requests and returns application/json.\n\nNote that the specific functionality behind `/api/v1/inbox/47` 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. The endpoint is live and returns a valid x402 challenge, but the lack of documentation makes it difficult to determine what data or service this particular inbox endpoint provides.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-platform","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","usdc api","base network api","402 payment api"],"warnings":["No documentation available for /api/v1/inbox/47 — the specific functionality is unknown","No OpenAPI or schema definition found for any endpoint on the platform","Crawled /api, /pricing, and /README pages returned no useful content (only 'Connect wallet')","The 'inbox' path pattern is unusual and not explained anywhere in available materials"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/47","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/47","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 there is no OpenAPI schema, no request/response examples, and no documentation explaining what /api/v1/inbox/47 actually does. The crawled pages beyond the homepage are empty wallet-connect prompts. The listing is effectively a stub with confirmed liveness and 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'/request':19,38,159 '0.02':18,37,79,158 '000':83 '20':82 '402 payment api' '6':89 'accept':170 'access':74,191 'addit':219 'advertis':98,114 'ai':12,31,126 'analysi':130 'analyt':120 'api':5,24,45,73,92,118,190,208 'application/json':175 'base':8,27,63,84 'base network api' 'base-network' 'behind':181 'beyond':186 'broad':50 'call':4,23 'caller':99 'catalog':51 'categori':116 'challeng':163,230 'classif':133 'confirm':168 'connect':214 'convers':150 'cost':76 'crawl':203 'data':11,30,119,123,242 'decim':90 'detail':220 'determin':240 'difficult':238 'doc':204 'document':185,235 'embed':134 'enabl':44 'endpoint':16,35,57,67,154,167,222,248 'estim':144 'exampl':200 'exchang':139 'export':124 'feed':138 'financ':13,32,135 'four':115 'function':180 'gas':143 'generat':151 'generic':188 'geocod':148 'header':111 'inbox':247 'infrastructur':146 'insight':125 'json-api' 'key':93 'label':192 'lack':233 'learn':128 'limit':96 'list':70,153 'live':224 'low payment fee' 'lowpaymentfee.com':39 'machin':127 'make':236 'metric':121 'micropayment api' 'minim':213 'network':64 'no-api-key' 'note':176 'offer':10,29 'openapi':196 'page':205 'particular':166,246 'pay':2,21,54,100 'pay per call api' 'pay-per-cal':1,20 'pay-per-request':53 'payment':110 'per':3,22,55,80,101 'platform':6,25,46,113 'post':171 'post-method' 'premium':72,189 'price':137,160,206 'prompt':216 'protocol':106 'provid':48,249 'quot':142 'rate':95,140 'readm':207 'report':122 'request':56,81,102,172 'request/response':199 'resolv':210 'return':174,226 'schema':197 'sentiment':129 'servic':244 'settl':58 'share':155 'specif':66,179 'summar':132 'text':131 'token':141 'unit':85 'usdc':9,28,60,87 'usdc api' 'usdc-settlement' 'util':15,34,147 'valid':149,228 'via':103 'wallet':215 'web3':136 'x':109 'x-payment':108 'x402':43,105,162,229 'x402 api' 'x402-enabled':42 'x402-payment'","prices":[{"id":"70f215df-73a6-423b-af41-676a2bcdf064","listingId":"f0ac35d1-e094-45ef-97d9-864bbbb9d57a","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/47","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:21.863Z"}],"sources":[{"listingId":"f0ac35d1-e094-45ef-97d9-864bbbb9d57a","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/47","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:21.863Z","lastSeenAt":"2026-04-22T11:32:57.673Z"}],"details":{"listingId":"f0ac35d1-e094-45ef-97d9-864bbbb9d57a","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/47 \\\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 valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/47"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/47"}],"useCases":["Agent-driven API consumption with per-call USDC micropayments","Accessing data, AI, or finance endpoints without API key registration","Programmatic pay-as-you-go access to utility services on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents that can settle x402 payments autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone requiring non-USDC or non-Base-network payment options"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:08.248Z"},"updatedAt":"2026-04-22T11:32:57.673Z"}}