{"id":"8c03d635-844a-470c-a1b2-386aa5352845","shortId":"g7QjnZ","kind":"x402","title":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","tagline":"Premium API access via x402 micropayment on Base — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" gated behind the x402 payment protocol. The site hosts a broad catalog of pay-per-call APIs spanning 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 endpoints are priced at $0.02 per request, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/apikeys/43` is described as \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base). Since USDC uses 6 decimals, this equals $0.02 per call. Payment is made via the x402 exact scheme — no API keys, subscriptions, or rate limits are advertised. The endpoint accepts POST requests and returns application/json.\n\nDocumentation is extremely sparse: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is live (402 challenge confirmed), but without documentation it is unclear what request body is expected or what the response payload contains. The site appears to be a demonstration or early-stage x402 API marketplace.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","micropayment","json-api","post-method"],"categories":["api-marketplace","infrastructure"],"synonyms":["x402 API","micropayment API","pay-per-call","USDC API access","Base network API","lowpaymentfee","premium API key"],"warnings":["No API documentation available — docs, pricing, and README pages all render only 'Connect wallet'","No OpenAPI or schema definition; request body and response format are unknown","Purpose of /api/v1/apikeys/43 ('Premium API Access') is unclear — it may generate API keys or serve as a generic gateway, but this is unverified","Site may be a demo or early-stage project; most listed endpoints lack any documentation"],"endpointUrl":"https://lowpaymentfee.com/api/v1/apikeys/43","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/apikeys/43","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 with clear pricing, but there is zero documentation on request format, response schema, or what 'Premium API Access' actually returns. Docs pages are empty. No OpenAPI spec exists. This is effectively a stub 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'0.02':9,22,92,139 '000':123 '0x8335':128 '20':122 '2913':129 '402':207 '6':135 'Base network API' 'USDC API access' 'accept':161 'access':3,16,34,111 'advertis':158 'ai':61 'analysi':65 'analyt':55 'api':2,15,33,52,110,151,173,239 'appear':229 'application/json':166 'avail':202 'base':8,21,100,124,131 'behind':36 'bodi':218 'broad':45 'call':51,141 'catalog':46 'challeng':117,208 'classif':68 'confirm':209 'connect':182 'contain':226 'content':188 'convers':85 'data':54,58 'decim':136 'demonstr':233 'describ':107 'doc':172 'document':167,197,212 'earli':236 'early-stag':235 'embed':69 'endpoint':28,88,104,160,204 'equal':138 'estim':79 'exact':148 'exampl':200 'exchang':74 'expect':220 'export':59 'extrem':169 'feed':73 'financ':70 'gas':78 'gate':35 'generat':86 'geocod':83 'host':43 'infrastructur':81 'insight':60 'json-api' 'key':152 'learn':63 'limit':156 'live':206 'lowpaymentfee' 'lowpaymentfee.com':30 'machin':62 'made':144 'marketplac':240 'maxamountrequir':120 'metric':56 'micropay':6,19 'micropayment' 'micropayment API' 'network':101 'openapi':192 'page':177 'pay':49 'pay-per-cal':48 'pay-per-call' 'pay-per-request' 'payload':201,225 'payment':39,142 'per':10,23,50,93,140 'post':162 'post-method' 'premium':1,14,32,109 'premium API key' 'price':72,90,174 'prompt':184 'protocol':40 'provid':31 'quot':77 'rate':75,155 'readm':176 'render':179 'report':57 'request':11,24,94,163,217 'request/response':195 'respons':224 'return':113,165 'schema':196 'scheme':149 'sentiment':64 'settl':95 'sinc':132 'site':42,228 'span':53 'spars':170 'spec':193 'specif':103 'stage':237 'subscript':153 'summar':67 'text':66 'token':76 'unclear':215 'unit':125 'usdc':13,26,97,127,133 'usdc-base' 'use':134 'util':82 'valid':84,115 'via':4,17,145 'wallet':183 'web3':71 'without':211 'x402':5,18,38,116,147,238 'x402 API' 'x402-payment'","prices":[{"id":"8be697c9-dba4-434c-91ef-bcd2a48df8c5","listingId":"8c03d635-844a-470c-a1b2-386aa5352845","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/apikeys/43","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T19:29:30.811Z"}],"sources":[{"listingId":"8c03d635-844a-470c-a1b2-386aa5352845","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/apikeys/43","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T19:29:30.811Z","lastSeenAt":"2026-04-22T10:32:32.510Z"}],"details":{"listingId":"8c03d635-844a-470c-a1b2-386aa5352845","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/apikeys/43 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"All endpoints priced at $0.02 per request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/apikeys/43"},{"claim":"Site offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Docs, API, pricing, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to a pay-per-call API catalog without API key management","Agent-driven API consumption with per-request USDC micropayments on Base","Exploring x402 protocol integration for automated service purchasing"],"bestFor":["Developers experimenting with x402 payment protocol","Agents that need keyless, pay-as-you-go API access","Low-volume consumers who want no subscription commitments"],"notFor":["Production workloads requiring documented request/response schemas","Users who need detailed API documentation or SDKs","High-throughput use cases where per-request crypto settlement adds latency"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:29.094Z"},"updatedAt":"2026-04-22T10:32:32.510Z"}}