{"id":"745c2ea1-9566-4170-8448-086d8ce6a774","shortId":"JykG3u","kind":"x402","title":"x402-gated premium API access on Base, paid per-request in USDC.","tagline":"x402-gated premium API access on Base, paid per-request in USDC.","description":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" behind an x402 paywall on the Base network. The specific resource at `/api/v1/charges/91` accepts POST requests and charges up to $0.02 per call in USDC (USD Coin), settled on-chain to a Base address. Payment is handled via the x402 protocol — no API keys, accounts, or rate limits are required; callers simply attach an X-PAYMENT header with a valid payment proof.\n\nThe broader lowpaymentfee.com platform advertises a suite of endpoints spanning 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 functionality behind `/api/v1/charges/91` — labeled only as \"Premium API Access\" — is not documented in detail. No OpenAPI schema, request/response examples, or detailed docs were found in the crawl.\n\nThe endpoint is live and returns a well-formed x402 challenge (HTTP 402) with version 1 of the protocol. The asset used for payment is USDC on Base (contract 0x8335…2913), with a maximum amount of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The timeout for payment settlement is 300 seconds.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-on-base","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid endpoint"],"warnings":["The exact functionality of /api/v1/charges/91 ('Premium API Access') is not documented — it is unclear what data or service it returns.","No OpenAPI spec, request body schema, or response schema was found.","Documentation, pricing, API, and README pages all returned only 'Connect wallet' with no substantive content.","The broader platform lists many endpoints (AI, finance, data, utils) but none map directly to /api/v1/charges/91."],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/91","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but the specific functionality behind /api/v1/charges/91 is undocumented. No OpenAPI schema, request/response examples, or detailed docs are available. The crawled pages beyond the landing page returned only 'Connect wallet' 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'0.02':57,149,224 '000':220 '0x8335':212 '1':198 '20':219 '2913':213 '300':236 '402':195 '6':228 'Base network API' 'USDC micropayment API' 'accept':50 'access':6,20,36,163 'account':82 'address':71 'advertis':105 'ai':118 'amount':217 'analysi':122 'analyt':112 'api':5,19,35,80,162 'asset':203 'attach':90 'base':8,22,43,70,210,221 'behind':37,156 'broader':102 'call':59 'caller':88 'chain':67 'challeng':193 'charg':54 'classif':125 'coin':63 'contract':211 'convers':142 'crawl':181 'crypto-paid endpoint' 'data':111,115 'decim':229 'detail':168,175 'doc':176 'document':166 'embed':126 'endpoint':30,109,145,183 'estim':136 'exampl':173 'exchang':131 'export':116 'feed':130 'financ':127 'form':191 'found':178 'function':155 'gas':135 'gate':3,17 'generat':143 'geocod':140 'given':225 'handl':74 'header':95 'howev':152 'http':194 'i.e':223 'infrastructur':138 'insight':117 'key':81 'label':158 'learn':120 'limit':85 'list':147 'live':185 'lowpaymentfee' 'lowpaymentfee.com':32,103 'machin':119 'maximum':216 'metric':113 'network':44 'no-api-key' 'on-chain':65 'openapi':170 'paid':9,23 'pay-per-call API' 'payment':72,94,99,206,233 'paywal':40 'per':11,25,58,150 'per-request':10,24 'per-request-billing' 'platform':104 'post':51 'post-endpoint' 'premium':4,18,34,161 'premium API access' 'price':129 'proof':100 'protocol':78,201 'provid':33 'quot':134 'rate':84,132 'report':114 'request':12,26,52,151 'request/response':172 'requir':87 'resourc':47 'return':187 'schema':171 'second':237 'sentiment':121 'settl':64 'settlement':234 'simpli':89 'span':110 'specif':46,154 'suit':107 'summar':124 'text':123 'timeout':231 'token':133 'unit':222 'usd':62 'usdc':14,28,61,208,226 'usdc-on-base' 'use':204 'util':139 'valid':98,141 'version':197 'via':75 'web3':128 'well':190 'well-form':189 'x':93 'x-payment':92 'x402':2,16,39,77,192 'x402 API' 'x402-gated':1,15 'x402-payment'","prices":[{"id":"14e3e26d-8387-4383-859e-67e8156c97f9","listingId":"745c2ea1-9566-4170-8448-086d8ce6a774","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/91","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:45:39.235Z"}],"sources":[{"listingId":"745c2ea1-9566-4170-8448-086d8ce6a774","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/91","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:45:39.235Z","lastSeenAt":"2026-04-23T22:02:13.365Z"}],"details":{"listingId":"745c2ea1-9566-4170-8448-086d8ce6a774","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/91 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a valid x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/91"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/91"},{"claim":"All endpoints on the platform are listed at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform advertises endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Agents that need to call a premium API without pre-registering for API keys","Pay-per-request access to backend services settled in USDC on Base","Programmatic access to a gated resource with on-chain payment proof"],"bestFor":["Developers or agents wanting keyless, pay-as-you-go API access","x402-compatible wallets and agent frameworks on Base","Low-cost micropayment use cases at $0.02 per call"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","Use cases requiring free or subscription-based pricing models","Callers who cannot produce x402 payment proofs on the Base network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:20.977Z"},"updatedAt":"2026-04-23T22:02:13.365Z"}}