{"id":"30d4a9c7-edc5-4ebf-ad13-c30d4c24845b","shortId":"B3DJA7","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 collection of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are pay-per-request using USDC on the Base network, with no API keys, no rate limits, and no minimum commitments required.\n\nThe specific endpoint at `/api/v1/inbox/177` is listed as \"Premium API Access\" and accepts POST requests. Its x402 challenge advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling to the provider's wallet on Base. The endpoint returns `application/json` responses.\n\nThe broader platform advertises additional endpoints including sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and generation — all at the same $0.02/request price point. However, the specific functionality behind the `/api/v1/inbox/177` path is not documented beyond the generic \"Premium API Access\" label, so its exact behavior is unclear. No OpenAPI schema, request body documentation, or example responses are available for this endpoint.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","post-method","no-api-key"],"categories":["general","infrastructure"],"synonyms":["lowpaymentfee","low payment fee API","x402 API","micropayment API","pay-per-call API","USDC API","Base network API"],"warnings":["The exact functionality of /api/v1/inbox/177 is unknown — 'Premium API Access' is not a meaningful description of what the endpoint does","No OpenAPI spec, request schema, or response examples are available","Documentation pages (/api, /pricing, /README) returned no useful content — only 'Connect wallet'","The platform lists many endpoints but none have detailed documentation visible from the crawl"],"endpointUrl":"https://lowpaymentfee.com/api/v1/inbox/177","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/177","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/request in USDC on Base). However, the specific functionality of /api/v1/inbox/177 is completely undocumented — no request schema, no response examples, no description beyond the generic 'Premium API Access' label. The crawled pages beyond the homepage returned only 'Connect wallet' with no useful 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'/request':19,38,184 '0.02':18,37,125,183 '000':114 '0x8335':119 '20':113 '2913':120 '6':130 'Base network API' 'USDC API' 'accept':102 'access':100,203 'addit':157 'advertis':108,156 'ai':12,31,57 'analysi':161 'analyt':56 'api':5,24,45,80,99,202 'application/json':151 'avail':221 'base':8,27,76,115,122,147 'behavior':208 'behind':191 'beyond':198 'bodi':215 'broad':50 'broader':154 'call':4,23 'challeng':107 'classif':164 'collect':51 'commit':88 'convers':176 'cost':111 'data':11,30,55 'decim':131 'document':197,216 'embed':165 'enabl':44 'endpoint':16,35,53,66,92,149,158,224 'equal':124 'estim':173 'exact':138,207 'exampl':218 'exchang':168 'feed':167 'financ':13,32,60 'function':190 'gas':172 'generat':178 'generic':200 'geocod':174 'howev':187 'includ':159 'infrastructur':63 'json-response' 'key':81 'label':204 'learn':59 'limit':84 'list':96 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':39 'machin':58 'made':134 'maximum':110 'micropayment API' 'minimum':87 'network':77 'no-api-key' 'offer':10,29 'openapi':212 'path':194 'pay':2,21,69 'pay-per-cal':1,20 'pay-per-call API' 'pay-per-request':68 'payment':132 'per':3,22,70,126 'platform':6,25,46,155 'point':186 'post':103 'post-method' 'premium':98,201 'price':166,185 'provid':48,143 'quot':171 'rate':83,169 'request':71,104,127,214 'requir':89 'respons':152,219 'return':150 'schema':213 'scheme':139 'sentiment':160 'settl':140 'span':54 'specif':91,189 'summar':163 'text':162 'token':170 'unclear':210 'unit':116 'usdc':9,28,73,118,128 'usdc-base' 'use':72,129 'util':15,34,64 'valid':175 'via':135 'wallet':145 'web3':61 'x402':43,106,137 'x402 API' 'x402-enabled':42 'x402-payment'","prices":[{"id":"99e7e50c-5890-468e-8405-64ee2ea6c3a1","listingId":"30d4a9c7-edc5-4ebf-ad13-c30d4c24845b","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/177","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:31.599Z"}],"sources":[{"listingId":"30d4a9c7-edc5-4ebf-ad13-c30d4c24845b","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/inbox/177","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:31.599Z","lastSeenAt":"2026-04-22T04:02:46.013Z"}],"details":{"listingId":"30d4a9c7-edc5-4ebf-ad13-c30d4c24845b","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/inbox/177 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\" \\\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 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/inbox/177"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/inbox/177"},{"claim":"Platform pricing is $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API key registration","Agent-driven workflows that need on-demand API access settled via USDC on Base","Testing x402 payment flows against a live endpoint"],"bestFor":["Developers wanting zero-signup, pay-as-you-go API access","AI agents with USDC on Base that need general-purpose API calls","Prototyping x402 payment integrations"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where $0.02/request adds up significantly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:12:52.119Z"},"updatedAt":"2026-04-22T04:02:46.013Z"}}