{"id":"acc8839e-a0e8-4d75-a45f-0446bc166f77","shortId":"sJYVfr","kind":"x402","title":"x402-gated premium API access on Base — pay $0.02/request in USDC, no API keys required.","tagline":"x402-gated premium API access on Base — pay $0.02/request in USDC, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform offering a broad catalog of endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are gated via the x402 payment protocol on the Base network, accepting USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) at a flat rate of $0.02 per request. There are no API keys, no rate limits, and no minimum commitments — callers simply attach an X-PAYMENT header with a valid payment proof to access any endpoint.\n\nThe specific endpoint at `/api/v1/customers/20` is listed as \"Premium API Access\" and returns `application/json` via POST. The x402 challenge indicates a maxAmountRequired of 20000 (in the token's smallest unit, which for USDC on Base with 6 decimals equals $0.02), paid to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The broader platform also advertises endpoints for 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 price point.\n\nDocumentation is extremely sparse: the /docs, /pricing, /api, 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 usage examples available from the crawl. The actual behavior and response format of the `/api/v1/customers/20` endpoint (and all other endpoints) cannot be verified from public documentation alone.","tags":[],"capabilities":["x402-payment-gating","usdc-base-network","json-api","no-api-key","per-request-billing","data-analytics","ai-inference","finance-data","crypto-data","utility-services"],"categories":["api-platform","finance","llm","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto-gated API","402 payment API"],"warnings":["Documentation pages (/docs, /pricing, /api, /README) all render only 'Connect wallet' with no usable content","No OpenAPI or schema available — request and response formats are unknown","The purpose of the specific endpoint /api/v1/customers/20 is not documented; 'Premium API Access' is a generic label","Cannot verify what data or functionality any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/20","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/customers/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint exists and accepts payment. However, documentation is essentially nonexistent — every doc page returns only 'Connect wallet'. There is no OpenAPI spec, no request/response schema, no examples, and the purpose of '/api/v1/customers/20' specifically is unclear. The listing is effectively a stub with a working payment 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'/api/v1/customers/20':118,243 '/docs':201 '/pricing':202 '/readme':205 '/request':11,28 '0.02':10,27,82,153,193 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':157 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':76 '20000':137 '300':160 '402 payment API' '6':150 'Base network API' 'USDC API' 'accept':73 'access':6,23,111,124 'actual':236 'address':156 'advertis':167 'ai':52 'ai-inference' 'alon':255 'also':166 'analysi':171 'analyt':51 'api':5,15,22,32,41,88,123 'application/json':127 'asset':75 'attach':99 'avail':231 'base':8,25,71,148 'behavior':237 'broad':45 'broader':164 'caller':97 'cannot':249 'catalog':46 'challeng':132 'classif':174 'commit':96 'connect':211 'content':217 'convers':186 'crawl':234 'crypto-data' 'crypto-gated API' 'data':50 'data-analytics' 'decim':151 'document':196,226,254 'embed':175 'enabl':40 'endpoint':48,61,113,116,168,244,248 'equal':152 'estim':183 'exampl':230 'exchang':178 'extrem':198 'feed':177 'financ':55 'finance-data' 'flat':79 'format':240 'gas':182 'gate':3,20,63 'generat':188 'geocod':184 'header':104 'indic':133 'infrastructur':58 'json-api' 'key':16,33,89 'learn':54 'limit':92 'list':120 'lowpaymentfee' 'lowpaymentfee.com':35 'machin':53 'maxamountrequir':135 'micropayment API' 'minimum':95 'network':72 'no-api-key' 'offer':43 'openapi':221 'page':206 'paid':154 'pay':9,26 'pay-per-call API' 'payment':67,103,108 'per':83 'per-request-billing' 'platform':42,165 'point':195 'post':129 'premium':4,21,122 'price':176,194 'prompt':213 'proof':109 'protocol':68 'public':253 'quot':181 'rate':80,91,179 'render':208 'request':84 'request/response':224 'requir':17,34 'respons':239 'return':126 'schema':225 'second':161 'sentiment':170 'simpli':98 'smallest':142 'span':49 'spars':199 'spec':222 'specif':115 'summar':173 'text':172 'timeout':162 'token':140,180 'unit':143 'usag':229 'usdc':13,30,74,146 'usdc-base-network' 'util':59 'utility-services' 'valid':107,185 'verifi':251 'via':64,128 'wallet':212 'web3':56 'x':102 'x-payment':101 'x402':2,19,39,66,131 'x402 API' 'x402-enabled':38 'x402-gated':1,18 'x402-payment-gating'","prices":[{"id":"3df96bfc-634f-474a-9db5-a3893fba6418","listingId":"acc8839e-a0e8-4d75-a45f-0446bc166f77","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/customers/20","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:32:16.508Z"}],"sources":[{"listingId":"acc8839e-a0e8-4d75-a45f-0446bc166f77","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/20","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:32:16.508Z","lastSeenAt":"2026-04-23T23:01:55.050Z"}],"details":{"listingId":"acc8839e-a0e8-4d75-a45f-0446bc166f77","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/20 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Flat pricing of $0.02 per request with no API keys, no rate limits, and no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 USDC on Base network with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/customers/20"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3","source_url":"https://lowpaymentfee.com/api/v1/customers/20"},{"claim":"Platform offers endpoints across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"All doc/pricing/API/README pages render only 'Connect wallet'","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium data or AI inference endpoints without managing API keys or subscriptions","Making one-off API calls with instant USDC micropayments on Base","Integrating pay-per-request analytics, finance, or utility services into agent workflows","Querying crypto gas estimates or token quotes with no rate limits"],"bestFor":["Developers or agents who want keyless, pay-as-you-go API access","Users already holding USDC on Base who want frictionless micropayments","Prototyping or low-volume use cases where subscriptions are overkill"],"notFor":["High-volume production workloads where per-request costs add up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-compatible wallet or USDC holdings"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:15:00.114Z"},"updatedAt":"2026-04-23T23:01:55.050Z"}}