{"id":"6a044de5-8135-4b08-8948-0c658358d72d","shortId":"ar4ZPC","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. It is one of many endpoints offered by the lowpaymentfee.com platform, which hosts a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request with no API keys, no rate limits, and no commitments.\n\nThe specific endpoint `/api/v1/charges/131` accepts POST requests and is gated by an x402 payment challenge. Payment is settled on the Base network using USDC (contract `0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The response MIME type is `application/json`. The payment timeout is 300 seconds.\n\nHowever, the exact functionality behind this particular `/charges/131` endpoint is unclear. The landing page lists many specific API paths (metrics, reports, sentiment analysis, summarization, geocoding, etc.) but does not list `/api/v1/charges/131` among them. It may be a generic charge endpoint or a specific resource not documented on the homepage. The docs, API, pricing, and README pages all returned only a \"Connect wallet\" prompt with no additional documentation. Without further documentation, the precise input/output schema and the data returned by this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["The endpoint /api/v1/charges/131 is not listed among the documented APIs on the homepage — its exact purpose is unknown.","All documentation pages (docs, API, pricing, README) returned only 'Connect wallet' with no substantive content.","No OpenAPI spec, request schema, or response schema is available — input/output format is entirely unknown.","The platform appears to be a generic x402 demo or early-stage project; reliability and data quality are unverified."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/131","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/131","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 the specific functionality of /api/v1/charges/131 is undocumented. No OpenAPI schema, no request/response examples, and all documentation pages return only 'Connect wallet' with no content. The endpoint path does not match any of the listed APIs on the 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'/charges/131':151 '0.02':12,28,77,127 '000':122 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':115 '20':121 '300':142 '6':130 'Base network API' 'USDC micropayment API' 'accept':94 'access':7,23,40 'addit':209 'ai':66 'among':175 'amount':119 'analysi':166 'analyt':65 'api':6,22,39,62,82,161,195 'application/json':137 'base':9,25,110,123 'base-network' 'behind':148 'call':4,20 'challeng':104 'charg':182 'commit':89 'connect':204 'contract':114 'crypto-paid API' 'data':64,220 'decim':131 'doc':194 'document':189,210,213 'endpoint':34,51,92,152,183,224 'equal':126 'etc':169 'exact':146 'financ':69 'function':147 'gate':99 'generic':181 'geocod':168 'homepag':192 'host':58 'howev':144 'infrastructur':72 'input/output':216 'json-response' 'key':83 'land':156 'learn':68 'limit':86 'list':158,173 'lowpaymentfee' 'lowpaymentfee.com':36,55 'machin':67 'mani':50,159 'maximum':118 'may':178 'metric':163 'mime':134 'network':111 'no-api-key' 'offer':52 'one':48 'page':157,199 'particular':150 'path':162 'pay':2,18 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'payment':44,103,105,139 'per':3,13,19,29,78 'platform':56 'post':95 'precis':215 'premium':5,21,38 'price':75,196 'prompt':206 'protocol':45 'provid':37 'rate':85 'readm':198 'remain':225 'report':164 'request':14,30,79,96 'resourc':187 'respons':133 'return':201,221 'schema':217 'second':143 'sentiment':165 'settl':107 'span':63 'specif':91,160,186 'suit':60 'summar':167 'timeout':140 'type':135 'unclear':154 'unit':124 'unknown':226 'usdc':16,32,113,128 'usdc-settlement' 'use':112,129 'util':73 'via':10,26,41 'wallet':205 'web3':70 'without':211 'x402':11,27,43,102 'x402 API' 'x402-payment'","prices":[{"id":"b160632b-a311-4b5d-b162-21b5f3b571fb","listingId":"6a044de5-8135-4b08-8948-0c658358d72d","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/131","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:12.186Z"}],"sources":[{"listingId":"6a044de5-8135-4b08-8948-0c658358d72d","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/131","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:12.186Z","lastSeenAt":"2026-04-24T05:02:30.815Z"}],"details":{"listingId":"6a044de5-8135-4b08-8948-0c658358d72d","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/131 \\\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":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"Pricing is $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"x402 challenge returns maxAmountRequired of 20000 base units in USDC on Base with 300s timeout","source_url":"https://lowpaymentfee.com/api/v1/charges/131"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/131"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to paid endpoints without subscription or API key management"],"bestFor":["Developers wanting zero-commitment, pay-per-use API access","AI agents that can settle x402 payments autonomously on Base","Users who prefer crypto-native micropayments over traditional billing"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before purchasing","Anyone without a Base-compatible wallet funded with USDC","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.098Z"},"updatedAt":"2026-04-24T05:02:30.815Z"}}