{"id":"5558a780-9de6-4fc0-a6f7-15a03d52dc8f","shortId":"SFtNy8","kind":"x402","title":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","tagline":"Pay-per-call API platform on Base network via x402 — $0.02/request, no API keys required.","description":"lowpaymentfee.com is an x402-enabled API platform that offers a broad set of endpoints across data analytics, AI/ML inference, finance/Web3 data, and utility services. All endpoints are paid per-request using USDC on the Base network at $0.02 per call, with no API keys, rate limits, or upfront commitments required. Payment is handled via the x402 protocol: callers attach an X-PAYMENT header to each request.\n\nThe specific endpoint at `/api/v1/charges/50` is listed as \"Premium API Access\" and advertises a maximum cost of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. The endpoint accepts POST requests and returns application/json. The broader platform also exposes 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 functionality behind each endpoint is unclear beyond the endpoint names and short labels on the landing page.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-base-network","data-analytics","ai-sentiment","ai-summarization","ai-classification","ai-embeddings","finance-price-feeds","exchange-rates","crypto-gas-estimates","geocoding","validation","conversion"],"categories":["api-platform","ai","finance","infrastructure"],"synonyms":["low payment fee","x402 api","pay per call api","micropayment api","base network api","usdc api","no api key","serverless api"],"warnings":["No OpenAPI or schema documentation available — endpoint behavior must be guessed from names alone","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","The specific purpose of /api/v1/charges/50 ('Premium API Access') is undefined — it does not match any of the named endpoints on the landing page","No request body schema or response schema is documented anywhere"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/50","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/charges/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live (402 challenge captured) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI spec, no request/response schema, no documentation beyond endpoint names, and no examples. The docs pages are empty. The actual functionality behind 'Premium API Access' at /api/v1/charges/50 is not described 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'/api/v1/charges/50':108 '/docs':185 '/pricing':186 '/readme':189 '/request':13,30 '0.02':12,29,74,133,177 '000':122 '0x8335':127 '20':121 '2913':128 '6':137 'accept':141 'access':114 'across':50 'actual':220 'advertis':116 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':53 'also':150 'analysi':155 'analyt':52 'api':5,15,22,32,41,79,113 'application/json':146 'attach':95 'avail':215 'base':8,25,71,123,130 'base network api' 'behind':222 'beyond':227 'broad':46 'broader':148 'call':4,21,76 'caller':94 'classif':158 'commit':85 'connect':195 'content':201 'convers':170 'conversion' 'cost':119 'crawl':218 'crypto-gas-estimates' 'data':51,56 'data-analytics' 'decim':138 'document':180,210 'embed':159 'enabl':40 'endpoint':49,61,106,140,152,224,229 'equal':132 'estim':167 'exampl':214 'exchang':162 'exchange-rates' 'expos':151 'extrem':182 'feed':161 'finance-price-feeds' 'finance/web3':55 'function':221 'gas':166 'generat':172 'geocod':168 'geocoding' 'given':134 'handl':89 'header':100 'infer':54 'key':16,33,80 'label':233 'land':236 'limit':82 'list':110 'low payment fee' 'lowpaymentfee.com':35 'maximum':118 'micropayment api' 'name':230 'network':9,26,72 'no api key' 'offer':44 'openapi':205 'page':190,237 'paid':63 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'payment':87,99 'per':3,20,65,75 'per-request':64 'per-request-billing' 'platform':6,23,42,149 'point':179 'post':142 'premium':112 'price':160,178 'prompt':197 'protocol':93 'quot':165 'rate':81,163 'render':192 'request':66,103,143 'request/response':208 'requir':17,34,86 'return':145 'schema':209 'sentiment':154 'serverless api' 'servic':59 'set':47 'short':232 'spars':183 'spec':206 'specif':105 'summar':157 'text':156 'token':164 'unclear':226 'unit':124 'upfront':84 'usag':213 'usdc':68,126,135 'usdc api' 'usdc-base-network' 'use':67 'util':58 'valid':169 'validation' 'via':10,27,90 'wallet':196 'x':98 'x-payment':97 'x402':11,28,39,92 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"d84914c8-d148-4afa-927a-89f049465a8b","listingId":"5558a780-9de6-4fc0-a6f7-15a03d52dc8f","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/charges/50","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:22.317Z"}],"sources":[{"listingId":"5558a780-9de6-4fc0-a6f7-15a03d52dc8f","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/50","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:22.317Z","lastSeenAt":"2026-04-22T16:31:17.419Z"}],"details":{"listingId":"5558a780-9de6-4fc0-a6f7-15a03d52dc8f","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/50 \\\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 are priced at $0.02 per request with no API keys, rate limits, or minimums","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Payment uses USDC on the Base network via x402 protocol","source_url":"https://lowpaymentfee.com"},{"claim":"The x402 challenge for /api/v1/charges/50 shows maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913)","source_url":"https://lowpaymentfee.com/api/v1/charges/50"}],"useCases":["Agent-driven API calls where per-request crypto payment replaces API key management","Quick access to AI inference (sentiment, summarization, classification, embeddings) without subscriptions","Fetching real-time crypto gas estimates or token quotes on demand","Geocoding or data conversion as a utility microservice"],"bestFor":["Developers and agents who want zero-signup, pay-as-you-go API access","x402-compatible agents that can attach payment headers automatically","Low-volume or bursty workloads where $0.02/request is cost-effective"],"notFor":["High-volume production workloads where per-request pricing adds up quickly","Users who need detailed API documentation, SLAs, or guaranteed uptime","Anyone without a Base-network USDC wallet or x402-capable client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.781Z"},"updatedAt":"2026-04-22T16:31:17.419Z"}}