{"id":"62c53d67-3e6d-4ab4-a309-e06a0126d3dd","shortId":"nKYFCF","kind":"x402","title":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","tagline":"Pay-per-call API platform on Base (USDC) via x402 — data, AI, finance, and utility endpoints at $0.02/request.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a 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/customers/58` is listed as \"Premium API Access\" and accepts POST requests. The x402 challenge indicates a maximum cost of 20,000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base), which equals $0.02 per request (USDC uses 6 decimals). Payment is made via the x402 exact scheme, settling directly on-chain to the provider's wallet.\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 per request price point. However, documentation beyond the landing page is extremely sparse; the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. The exact input/output schema for this particular endpoint is not documented, so callers will need to experiment or contact the provider to understand the expected request body and response format.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","data-analytics","ai-inference","finance-data","utility-services","no-api-key","post-endpoint"],"categories":["data","llm","finance","geo"],"synonyms":["x402 API","pay-per-call API","USDC API","Base network API","micropayment API","lowpaymentfee","crypto API access","on-chain API payment"],"warnings":["No documentation available — docs, API, pricing, and README pages all render only 'Connect wallet'","The specific purpose and expected input/output of /api/v1/customers/58 is undocumented","No OpenAPI spec or schema provided for any endpoint","The endpoint path '/api/v1/customers/58' suggests a customer-specific resource but its function is unclear"],"endpointUrl":"https://lowpaymentfee.com/api/v1/customers/58","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 402 challenge with clear pricing. However, documentation is essentially nonexistent beyond the landing page — docs, API, pricing, and README pages all show only 'Connect wallet'. There is no OpenAPI spec, no input/output schema documentation, and no example requests or responses for this specific endpoint. The purpose of '/api/v1/customers/58' is unclear beyond the generic 'Premium API Access' 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'/request':20,40 '0.02':19,39,125,180 '000':115 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':120 '20':114 '6':130 'Base network API' 'USDC API' 'accept':103 'access':101 'addit':154 'advertis':153 'ai':13,33,58 'ai-inference' 'analysi':158 'analyt':57 'api':5,25,47,81,100,196 'base':8,28,77,116,122 'beyond':187 'bodi':238 'broader':151 'call':4,24 'caller':224 'chain':144 'challeng':108 'classif':161 'collect':52 'commit':89 'connect':205 'contact':230 'content':211 'convers':173 'cost':112 'crypto API access' 'data':12,32,56 'data-analytics' 'decim':131 'direct':141 'doc':195 'document':186,222 'embed':162 'enabl':46 'endpoint':17,37,54,67,93,155,219 'equal':124 'estim':170 'exact':138,213 'exchang':165 'expect':236 'experi':228 'extrem':192 'feed':164 'financ':14,34,61 'finance-data' 'format':241 'gas':169 'generat':175 'geocod':171 'howev':185 'includ':156 'indic':109 'infrastructur':64 'input/output':214 'key':82 'land':189 'learn':60 'limit':85 'list':97 'lowpaymentfee' 'lowpaymentfee.com':41 'machin':59 'made':134 'maximum':111 'micropayment API' 'minimum':88 'need':226 'network':78 'no-api-key' 'offer':50 'on-chain':142 'on-chain API payment' 'page':190,200 'particular':218 'pay':2,22,70 'pay-per-cal':1,21 'pay-per-call API' 'pay-per-request':69 'payment':132 'per':3,23,71,126,181 'platform':6,26,48,152 'point':184 'post':104 'post-endpoint' 'premium':99 'price':163,183,197 'prompt':207 'provid':147,232 'quot':168 'rate':84,166 'readm':199 'render':202 'request':72,105,127,182,237 'requir':90 'respons':240 'schema':215 'scheme':139 'sentiment':157 'settl':140 'span':55 'spars':193 'specif':92 'summar':160 'text':159 'token':167 'understand':234 'unit':117 'usdc':9,29,74,119,128 'usdc-base' 'use':73,129 'util':16,36,65 'utility-services' 'valid':172 'via':10,30,135 'wallet':149,206 'web3':62 'x402':11,31,45,107,137 'x402 API' 'x402-enabled':44 'x402-payment'","prices":[{"id":"4907b985-4ef3-40b6-aef1-39ea3103c16b","listingId":"62c53d67-3e6d-4ab4-a309-e06a0126d3dd","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/58","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:38:34.592Z"}],"sources":[{"listingId":"62c53d67-3e6d-4ab4-a309-e06a0126d3dd","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/customers/58","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:38:34.592Z","lastSeenAt":"2026-04-23T12:30:48.050Z"}],"details":{"listingId":"62c53d67-3e6d-4ab4-a309-e06a0126d3dd","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/customers/58 \\\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":"All 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 x402 challenge specifies maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base","source_url":"https://lowpaymentfee.com/api/v1/customers/58"},{"claim":"Available endpoint categories include Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure","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":["Accessing data analytics and reporting endpoints without API key management","Running AI inference tasks (sentiment, summarization, classification, embeddings) on a per-call payment basis","Fetching real-time finance data such as token quotes, exchange rates, and gas estimates","Using utility services like geocoding, validation, and data conversion with instant crypto payment"],"bestFor":["Developers who want API access without subscriptions or API key provisioning","AI agents that can autonomously pay for API calls via x402 on Base","Projects needing low-cost, on-demand access to a variety of utility and data endpoints"],"notFor":["Users who need detailed API documentation and well-defined schemas before integrating","High-volume production workloads that would benefit from bulk pricing or rate-limited SLAs","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:41.474Z"},"updatedAt":"2026-04-23T12:30:48.050Z"}}