{"id":"b4c43f05-85eb-4628-acb5-3be9fd0b7312","shortId":"hZRhvp","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02 per request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The site hosts a collection of pay-per-request APIs spanning data & analytics, 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, payable in USDC on the Base network with no API keys, no rate limits, and no minimum commitments.\n\nThe specific endpoint `/api/v1/charges/277` is labeled \"Premium API Access\" and returns a valid x402 challenge with a maxAmountRequired of 20,000 base units of USDC (0x8335…2913 on Base), which equals $0.02 given USDC's 6 decimals. Payment is made via the x402 exact scheme by including an X-PAYMENT header. The endpoint accepts POST requests and returns application/json responses. The payment timeout is 300 seconds.\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 examples of what this particular endpoint actually returns. It is unclear what specific data or functionality the `/api/v1/charges/277` endpoint provides beyond the generic \"Premium API Access\" label. The site appears to be a demonstration or early-stage platform for x402-gated APIs.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-api","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay per call API","USDC API access","Base network API","micropayment API","lowpaymentfee","crypto-paid API"],"warnings":["No documentation available — /docs, /api, /pricing, and /README pages are all empty (only show 'Connect wallet')","No OpenAPI or schema describing what this endpoint actually does or what it returns","The endpoint path '/api/v1/charges/277' does not match any of the advertised API categories on the homepage","Unclear what specific data or service 'Premium API Access' provides — may be a generic or demo endpoint"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/277","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/277","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, but there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific functionality behind '/api/v1/charges/277' is completely opaque — only the generic label 'Premium API Access' is provided. The site's docs pages are empty beyond wallet-connect 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'/api/v1/charges/277':115,229 '/docs':184 '/pricing':186 '/readme':188 '0.02':12,28,91,143 '000':132 '0x8335':137 '20':131 '2913':138 '300':177 '6':147 'Base network API' 'USDC API access' 'accept':166 'access':7,23,40,120,237 'actual':218 'ai':60 'analysi':64 'analyt':59 'api':6,22,39,56,103,119,236,255 'appear':241 'application/json':171 'base':9,25,99,133,140 'beyond':232 'call':4,20 'challeng':126 'classif':67 'collect':50 'commit':111 'connect':194 'content':200 'convers':84 'crypto-paid API' 'data':58,225 'decim':148 'demonstr':245 'document':179,209 'earli':248 'early-stag':247 'embed':68 'endpoint':34,87,114,165,217,230 'equal':142 'estim':78 'exact':155 'exampl':212 'exchang':73 'extrem':181 'feed':72 'financ':69 'function':227 'gas':77 'gate':254 'generat':85 'generic':234 'geocod':82 'given':144 'header':163 'host':48 'includ':158 'infrastructur':80 'json-api' 'key':104 'label':117,238 'learn':62 'limit':107 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':61 'made':151 'maxamountrequir':129 'micropayment API' 'minimum':110 'network':100 'no-api-key' 'openapi':204 'page':189 'particular':216 'pay':2,18,53 'pay per call API' 'pay-per-cal':1,17 'pay-per-request':52 'payabl':94 'payment':44,149,162,174 'per':3,13,19,29,54,92 'platform':250 'post':167 'post-method' 'premium':5,21,38,118,235 'price':71,89 'prompt':196 'protocol':45 'provid':37,231 'quot':76 'rate':74,106 'render':191 'request':14,30,55,93,168 'request/response':207 'respons':172 'return':122,170,219 'schema':208 'scheme':156 'second':178 'sentiment':63 'site':47,240 'span':57 'spars':182 'spec':205 'specif':113,224 'stage':249 'summar':66 'text':65 'timeout':175 'token':75 'unclear':222 'unit':134 'usdc':16,32,96,136,145 'usdc-base' 'util':81 'valid':83,124 'via':10,26,41,152 'wallet':195 'web3':70 'x':161 'x-payment':160 'x402':11,27,43,125,154,253 'x402 API' 'x402-gated':252 'x402-payment'","prices":[{"id":"89520ab5-cca1-4fba-846b-fbc7c7f14440","listingId":"b4c43f05-85eb-4628-acb5-3be9fd0b7312","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/277","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:51.450Z"}],"sources":[{"listingId":"b4c43f05-85eb-4628-acb5-3be9fd0b7312","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/277","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:51.450Z","lastSeenAt":"2026-04-24T01:32:05.563Z"}],"details":{"listingId":"b4c43f05-85eb-4628-acb5-3be9fd0b7312","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/277 \\\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":"Site offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/277"}],"useCases":["Accessing pay-per-request APIs without needing API keys or subscriptions","Making USDC micropayments on Base for on-demand API calls","Integrating x402-compatible agents with low-cost data or utility endpoints"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","x402-compatible AI agents needing low-friction endpoint access","Users who prefer crypto-native payment rails over traditional billing"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","Applications requiring high-throughput with predictable bulk pricing","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.194Z"},"updatedAt":"2026-04-24T01:32:05.563Z"}}