{"id":"3d6044ce-8878-4395-8c3d-12cbc10d461d","shortId":"yAjHap","kind":"x402","title":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","tagline":"Pay-per-call premium API access on Base via x402 — $0.02/request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource `/api/v1/charges/114` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or rate limits required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs across four categories: Data & Analytics (metrics, reports, data export, insights), 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 listed at $0.02 per request. However, the specific endpoint being listed here (`/api/v1/charges/114`) is labeled generically as \"Premium API Access\" and its exact functionality is not documented — it may serve as a generic charge endpoint or gateway.\n\nThe endpoint is live and returns a valid x402 challenge (HTTP 402) with a 300-second payment timeout. Documentation on the site is extremely thin: the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema, and no usage examples available from the crawled material.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","crypto API access","402 payment endpoint"],"warnings":["No OpenAPI spec or request/response schema available","Documentation pages (docs, API, pricing, README) all render only 'Connect wallet' with no content","The exact functionality of /api/v1/charges/114 is undocumented — unclear what data or service it returns","No usage examples or sample responses found in crawled material"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/114","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/114","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 of /api/v1/charges/114 is unclear beyond the generic 'Premium API Access' label. Docs pages are empty 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'/request':13,28 '0.02':12,27,69,148 '000':56 '0x8335':61 '20':55 '2913':62 '300':197 '402':194 '402 payment endpoint' '6':74 'Base network API' 'USDC micropayment API' 'accept':48 'access':7,22,38,165 'across':107 'advertis':98 'ai':117 'analysi':121 'analyt':111 'api':6,21,37,88,106,164,210 'avail':239 'base':9,24,57,65 'broader':95 'call':4,19,105 'categori':109 'challeng':192 'charg':52,179 'classif':124 'connect':219 'convers':141 'crawl':242 'crypto API access' 'data':110,114 'decim':75 'detail':226 'doc':209 'document':172,201 'embed':125 'endpoint':32,144,154,180,184 'equal':68 'estim':135 'exact':168 'exampl':238 'exchang':130 'export':115 'extrem':206 'feed':129 'financ':126 'four':108 'function':169 'gas':134 'gateway':182 'generat':142 'generic':161,178 'geocod':139 'handl':78 'header':85 'howev':151 'http':193 'infrastructur':137 'inlin':79 'insight':116 'key':89 'label':160 'learn':119 'limit':92 'list':146,156 'live':186 'lowpaymentfee' 'lowpaymentfee.com':34,96 'machin':118 'materi':243 'may':174 'metric':112 'network':66 'no-api-key' 'openapi':230 'page':214 'pay':2,17,103 'pay-per-cal':1,16,102 'pay-per-call' 'pay-per-request API' 'payment':42,76,84,199 'per':3,18,70,104,149 'platform':97 'post':49 'post-endpoint' 'premium':5,20,36,163 'price':128,211 'prompt':221 'protocol':43 'provid':35 'quot':133 'rate':91,131 'readm':213 'render':216 'report':113 'request':50,71,150 'request/response':233 'requir':93 'resourc':46 'return':188 'schema':234 'second':198 'sentiment':120 'serv':175 'site':204 'spec':231 'specif':45,153 'suit':100 'summar':123 'technic':225 'text':122 'thin':207 'timeout':200 'token':132 'unit':58 'usag':237 'usdc':15,30,60,72 'usdc-base' 'use':73 'util':138 'valid':140,190 'via':10,25,39,80 'wallet':220 'web3':127 'x':83 'x-payment':82 'x402':11,26,41,191 'x402 API' 'x402-payment'","prices":[{"id":"701036b3-ac2e-4711-be21-e0666b96baf1","listingId":"3d6044ce-8878-4395-8c3d-12cbc10d461d","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/114","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:15.821Z"}],"sources":[{"listingId":"3d6044ce-8878-4395-8c3d-12cbc10d461d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/114","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:15.821Z","lastSeenAt":"2026-04-24T05:32:02.778Z"}],"details":{"listingId":"3d6044ce-8878-4395-8c3d-12cbc10d461d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/114 \\\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":"Endpoint returns HTTP 402 with x402 challenge, maxAmountRequired 20000 USDC base units on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/114"},{"claim":"All APIs listed at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/114"}],"useCases":["Programmatic access to premium API services without API key management","Agent-driven pay-per-call workflows settled in USDC on Base","Integrating low-cost micropayment-gated endpoints into automated pipelines"],"bestFor":["Developers wanting keyless, pay-as-you-go API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","Applications requiring high-throughput with predictable flat-rate pricing","Users without access to USDC on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:24.934Z"},"updatedAt":"2026-04-24T05:32:02.778Z"}}