{"id":"d99484d1-afea-4c2d-abac-ce26a40e935d","shortId":"DZArZg","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 broad catalog of pay-per-request APIs spanning data & analytics, AI/ML inference (sentiment analysis, 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, settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/316` is labeled \"Premium API Access\" and accepts POST requests. It returns an x402 challenge requiring an exact payment of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals = $0.02) per call. The payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. No API keys or rate limits are advertised — access is gated purely by micropayment.\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 the endpoint actually returns. The site's landing page lists many endpoint paths but provides no detail on input parameters or output formats. Because of this, the actual functionality behind `/api/v1/charges/316` is unclear — it may be a generic charge endpoint or a gateway to one of the listed services.","tags":[],"capabilities":["x402-payment","usdc-micropayment","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","micropayment API","USDC pay-per-call","Base network API","lowpaymentfee","pay-per-request endpoint","crypto API access"],"warnings":["No OpenAPI or schema documentation available — input/output formats are unknown.","All documentation pages (docs, API, pricing, README) render only 'Connect wallet' with no content.","The specific purpose of /api/v1/charges/316 ('Premium API Access') is vague — it is unclear what data or service it provides.","The site lists many endpoints but none have documented parameters or response formats."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/316","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/316","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, confirming pricing and payment details. However, there is no OpenAPI spec, no documented request/response schema, no examples, and the docs pages are empty ('Connect wallet' only). The actual functionality behind this specific charge endpoint is unclear, making this effectively a stub 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'0.02':12,28,90,135 '000':124 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':144 '0x8335':129 '20':123 '2913':130 '300':147 '6':133 'Base network API' 'USDC pay-per-call' 'accept':110 'access':7,23,40,108,158 'actual':202,227 'address':143 'advertis':157 'ai/ml':61 'analysi':64 'analyt':60 'api':6,22,39,57,107,151,170 'base':9,25,98,125,132 'base-network' 'behind':229 'broad':50 'call':4,20,137 'catalog':51 'challeng':117 'charg':238 'classif':66 'connect':179 'content':185 'convers':83 'crypto API access' 'data':59 'decim':134 'detail':216 'doc':169 'document':164,194 'embed':67 'endpoint':34,86,102,201,211,239 'estim':77 'exact':120 'exampl':197 'exchang':72 'extrem':166 'feed':71 'financ':68 'format':222 'function':228 'gas':76 'gate':160 'gateway':242 'generat':84 'generic':237 'geocod':81 'host':48 'infer':62 'infrastructur':79 'input':218 'key':152 'label':105 'land':207 'limit':155 'list':209,247 'lowpaymentfee' 'lowpaymentfee.com':36 'mani':210 'may':234 'micropay':163 'micropayment API' 'network':99 'no-api-key' 'one':244 'openapi':189 'output':221 'page':174,208 'paramet':219 'path':212 'pay':2,18,54 'pay-per-cal':1,17 'pay-per-request':53 'pay-per-request endpoint' 'payment':44,121,139 'per':3,13,19,29,55,91,136 'post':111 'post-endpoint' 'premium':5,21,38,106 'price':70,88,171 'prompt':181 'protocol':45 'provid':37,214 'pure':161 'quot':75 'rate':73,154 'readm':173 'render':176 'request':14,30,56,92,112 'request/response':192 'requir':118 'return':114,203 'schema':193 'second':148 'sent':141 'sentiment':63 'servic':248 'settl':93 'site':47,205 'span':58 'spars':167 'spec':190 'specif':101 'summar':65 'timeout':149 'token':74 'unclear':232 'unit':126 'usdc':16,32,95,128 'usdc-micropayment' 'util':80 'valid':82 'via':10,26,41 'wallet':180 'web3':69 'x402':11,27,43,116 'x402 API' 'x402-payment'","prices":[{"id":"be12d83d-cd20-4761-a5ae-6dec5b822836","listingId":"d99484d1-afea-4c2d-abac-ce26a40e935d","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/316","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:58.087Z"}],"sources":[{"listingId":"d99484d1-afea-4c2d-abac-ce26a40e935d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/316","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:58.087Z","lastSeenAt":"2026-04-24T01:32:05.815Z"}],"details":{"listingId":"d99484d1-afea-4c2d-abac-ce26a40e935d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/316 \\\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":"x402 challenge returns maxAmountRequired of 20000 base units of USDC (USD Coin) on Base with 300-second timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/316"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/316"},{"claim":"Site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium API services without traditional API key registration","Making one-off paid API calls settled in USDC on Base","Agent-driven programmatic access to data, AI, or finance endpoints via micropayments"],"bestFor":["Developers who want keyless, pay-as-you-go API access","AI agents that can settle x402 micropayments autonomously","Users who prefer crypto-native payment rails over subscription billing"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or rate-limit guarantees","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:22.935Z"},"updatedAt":"2026-04-24T01:32:05.815Z"}}