{"id":"aeeaf958-e303-45e5-adb7-5782e9eb6580","shortId":"UBs6U4","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 include an X-PAYMENT header with each request to settle in USDC.\n\nThe specific endpoint at `/api/v1/charges/250` is listed as \"Premium API Access\" and advertises a maximum charge of 20,000 base units of USDC (0.02 USDC, i.e., $0.02) on Base. The platform also exposes endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, token quotes, gas estimates, geocoding, validation, conversion, and data generation — all at the same $0.02 price point.\n\nDocumentation is extremely thin: the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no description of what data or functionality each endpoint actually returns. The endpoint is live (returns a valid 402 challenge), but without documentation it is unclear what payload to send or what response to expect from this particular \"Premium API Access\" endpoint.","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","usdc api","base network api","micropayment api","no-api-key endpoint","crypto pay-per-use"],"warnings":["No API documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet'","No OpenAPI or JSON schema describing request/response formats","The specific purpose of /api/v1/charges/250 ('Premium API Access') is unclear and undocumented","Cannot verify what data or service any endpoint actually returns"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/250","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/250","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, there is no OpenAPI schema, no request/response examples, and all documentation pages render only 'Connect wallet' with no useful content. The actual functionality behind 'Premium API Access' at /api/v1/charges/250 is undocumented, making this effectively a stub 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'/api/v1/charges/250':112 '/docs':175 '/pricing':176 '/readme':179 '/request':13,30 '0.02':12,29,74,131,134,167 '000':126 '20':125 '402':219 'access':118,241 'across':50 'actual':210 'advertis':120 'ai-classification' 'ai-embeddings' 'ai-sentiment' 'ai-summarization' 'ai/ml':53 'also':139 'analysi':144 'analyt':52 'api':5,15,22,32,41,79,117,240 'base':8,25,71,127,136 'base network api' 'broad':46 'call':4,21,76 'caller':94 'challeng':220 'charg':123 'classif':147 'commit':85 'connect':185 'content':191 'convers':159 'conversion' 'crypto pay-per-use' 'crypto-gas-estimates' 'data':51,56,161,205 'data-analytics' 'descript':202 'document':170,223 'embed':148 'enabl':40 'endpoint':49,61,110,141,209,213,242 'estim':156 'exampl':199 'exchang':151 'exchange-rates' 'expect':235 'expos':140 'extrem':172 'feed':150 'finance-price-feeds' 'finance/web3':55 'function':207 'gas':155 'generat':162 'geocod':157 'geocoding' 'handl':89 'header':100 'i.e':133 'includ':95 'infer':54 'key':16,33,80 'limit':82 'list':114 'live':215 'low payment fee' 'lowpaymentfee.com':35 'maximum':122 'micropayment api' 'network':9,26,72 'no-api-key endpoint' 'offer':44 'openapi':195 'page':180 'paid':63 'particular':238 'pay':2,19 'pay per call api' 'pay-per-cal':1,18 'payload':228 'payment':87,99 'per':3,20,65,75 'per-request':64 'per-request-billing' 'platform':6,23,42,138 'point':169 'premium':116,239 'price':149,168 'prompt':187 'protocol':93 'quot':154 'rate':81,152 'render':182 'request':66,103 'request/response':198 'requir':17,34,86 'respons':233 'return':211,216 'schema':196 'send':230 'sentiment':143 'servic':59 'set':47 'settl':105 'specif':109 'summar':146 'text':145 'thin':173 'token':153 'unclear':226 'unit':128 'upfront':84 'usdc':68,107,130,132 'usdc api' 'usdc-base-network' 'use':67 'util':58 'valid':158,218 'validation' 'via':10,27,90 'wallet':186 'without':222 'x':98 'x-payment':97 'x402':11,28,39,92 'x402 api' 'x402-enabled':38 'x402-payment'","prices":[{"id":"6a40e9f9-b0d8-4434-8a6b-2e85d510ed37","listingId":"aeeaf958-e303-45e5-adb7-5782e9eb6580","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/250","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:52.057Z"}],"sources":[{"listingId":"aeeaf958-e303-45e5-adb7-5782e9eb6580","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/250","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:52.057Z","lastSeenAt":"2026-04-22T16:31:15.148Z"}],"details":{"listingId":"aeeaf958-e303-45e5-adb7-5782e9eb6580","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/250 \\\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":"Endpoint returns 402 with maxAmountRequired of 20000 base units USDC (0.02 USDC) on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/250"},{"claim":"Platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing AI inference (sentiment, summarization, classification, embeddings) without API key signup","Fetching real-time crypto token quotes and gas estimates via micropayment","Running geocoding or data validation calls on a pay-as-you-go basis","Exporting analytics data or generating reports per-request"],"bestFor":["Developers wanting instant API access without registration or API keys","Agents and bots that can settle x402 payments in USDC on Base","Low-volume or exploratory use cases where $0.02/call is cost-effective"],"notFor":["High-volume production workloads needing SLAs or guaranteed uptime documentation","Users who need detailed API documentation, schemas, or example payloads before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.168Z"},"updatedAt":"2026-04-22T16:31:15.148Z"}}