{"id":"efee40d5-922e-41ef-b299-3084f364a058","shortId":"8hYRDb","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, rate limits, or commitments required.\n\nThe specific endpoint `/api/v1/charges/92` is labeled \"Premium API Access\" in the x402 challenge but lacks further documentation about what data or functionality it returns. The x402 challenge confirms it is live, accepts POST requests, and requires payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to wallet address `0x1A2B...85F3`. The response MIME type is `application/json`.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema, and no usage examples available. The platform appears to be a demonstration or early-stage x402 marketplace. Without knowing what this specific charge endpoint returns, users should treat it as exploratory.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet'","No OpenAPI or request/response schema provided","The specific functionality of /api/v1/charges/92 is undocumented and unclear","Platform may be a demo or early-stage project"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/92","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is confirmed live via a valid 402 challenge, and pricing is clear ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The specific functionality of /api/v1/charges/92 is unknown beyond the label 'Premium API Access'. This is effectively a stub 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'/request':13,28 '0.02':12,27,81,146 '000':141 '0x1a2b':156 '20':140 '6':151 '85f3':157 'Base network API' 'USDC micropayment API' 'accept':131 'access':7,22,38,108 'addit':187 'address':155 'ai':68 'analyt':67 'api':6,21,37,64,93,107,173 'appear':204 'application/json':163 'avail':201 'base':9,24,89,142 'base-network' 'call':4,19 'catalog':58 'challeng':112,126 'charg':220 'commit':98 'confirm':127 'connect':182 'content':188 'crypto-paid API' 'data':66,119 'decim':152 'demonstr':208 'doc':172 'document':116,164 'earli':211 'early-stag':210 'endpoint':32,49,77,102,221 'exampl':200 'exploratori':228 'extrem':169 'financ':71 'function':121 'host':56 'infrastructur':74 'json-response' 'key':94 'know':216 'label':105 'lack':114 'learn':70 'limit':96 'live':130 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'marketplac':214 'mime':160 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':192 'page':177 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,136 'per':3,18,62,82 'platform':54,203 'post':132 'premium':5,20,36,106 'premium API access' 'price':79,174 'prompt':184 'protocol':43 'provid':35 'rate':95 'readm':176 'render':179 'request':63,83,133 'request/response':195 'requir':99,135 'respons':159 'return':123,222 'schema':196 'settl':84 'sinc':148 'site':167 'span':65 'spars':170 'spec':193 'specif':101,219 'stage':212 'treat':225 'type':161 'unit':143 'usag':199 'usd':147 'usdc':15,30,86,145,149 'usdc-settlement' 'use':150 'user':223 'util':75 'via':10,25,39 'wallet':154,183 'web3':72 'without':215 'x402':11,26,41,111,125,213 'x402 API' 'x402-payment'","prices":[{"id":"6408aa93-a1be-445f-9f44-04212a64d035","listingId":"efee40d5-922e-41ef-b299-3084f364a058","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/92","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:32.624Z"}],"sources":[{"listingId":"efee40d5-922e-41ef-b299-3084f364a058","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/92","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:32.624Z","lastSeenAt":"2026-04-23T01:01:24.765Z"}],"details":{"listingId":"efee40d5-922e-41ef-b299-3084f364a058","quickStartSnippet":"# The endpoint requires an X-PAYMENT header with a valid x402 payment proof.\n# Using curl as a conceptual example (actual payment header must be constructed\n# by an x402-compatible client):\n\ncurl -X POST https://lowpaymentfee.com/api/v1/charges/92 \\\n  -H \"X-PAYMENT: <x402_payment_token>\" \\\n  -H \"Content-Type: application/json\"","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, confirming it is live","source_url":"https://lowpaymentfee.com/api/v1/charges/92"},{"claim":"Price is $0.02 per request (maxAmountRequired 20000 base units of USDC with 6 decimals)","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/92"}],"useCases":["Exploring x402 payment protocol integration for API monetization","Accessing pay-per-request services without API key management","Testing micropayment-settled API calls on Base network"],"bestFor":["Developers experimenting with x402 payment flows","Agents that can settle USDC payments on Base","Projects needing keyless, pay-as-you-go API access"],"notFor":["Production workloads requiring documented request/response schemas","Users who need free or fiat-only payment options","Anyone needing detailed API documentation before integrating"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:21.234Z"},"updatedAt":"2026-04-23T01:01:24.765Z"}}