{"id":"75c15ea6-e841-433f-91d2-a5e5c19e9da0","shortId":"CqC6j8","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 protocol on the Base network. This specific endpoint (`/api/v1/payments/202`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of $0.02 per call (20,000 base units with 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an `X-PAYMENT` header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints 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 listed endpoints share the same $0.02/request pricing. However, the specific endpoint being listed here (`/api/v1/payments/202`) does not clearly map to any of these named services; its exact functionality beyond \"Premium API Access\" is not documented.\n\nThe endpoint is live and returns a well-formed x402 challenge (version 1, scheme \"exact\") with a 300-second payment timeout. Documentation pages on the site (/docs, /pricing, /api, /README) all render only a \"Connect wallet\" prompt with no further technical detail, so the request/response schema for this endpoint is unknown.","tags":[],"capabilities":["x402-payment-gated","usdc-settlement","base-network","pay-per-request","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-gated endpoint"],"warnings":["The exact functionality of /api/v1/payments/202 is not documented — 'Premium API Access' is the only description available.","All documentation pages (/docs, /pricing, /api, /README) are empty beyond a 'Connect wallet' prompt.","No OpenAPI spec, request schema, or response schema is available.","The endpoint path does not match any of the named services listed on the homepage."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/202","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/payments/202","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 there is no documentation, no OpenAPI schema, no request/response examples, and the specific functionality of /api/v1/payments/202 is undescribed. All doc pages render only 'Connect wallet' with no 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'/api/v1/payments/202':54,171 '/docs':219 '/pricing':220 '/readme':222 '/request':13,28,162 '0.02':12,27,79,161 '000':83 '0x8335':70 '1':205 '20':82 '2913':71 '300':210 '6':87 'Base network API' 'USDC micropayment API' 'accept':61 'access':7,22,59,188 'across':119 'advertis':117 'ai':129 'analysi':133 'analyt':123 'api':6,21,40,58,90,187 'attach':101 'base':9,24,49,73,84 'base-network' 'beyond':185 'broader':114 'call':4,19,81 'caller':99 'categori':121 'challeng':203 'classif':136 'clear':174 'collect':34 'commit':96 'connect':227 'contract':69 'convers':153 'cost':77 'crypto-gated endpoint' 'data':122,126 'decim':88 'detail':234 'document':191,214 'embed':137 'endpoint':41,53,118,157,167,193,241 'estim':147 'exact':183,207 'exchang':142 'export':127 'feed':141 'financ':138 'form':201 'four':120 'function':184 'gas':146 'gate':42 'generat':154 'geocod':151 'header':106 'host':32 'howev':164 'infrastructur':149 'insight':128 'key':91 'label':56 'learn':131 'limit':93 'list':156,169 'live':195 'lowpaymentfee' 'lowpaymentfee.com':31,115 'machin':130 'map':175 'maximum':76 'metric':124 'name':180 'network':50 'no-api-key' 'page':215 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':64,105,111,212 'per':3,18,38,80 'platform':116 'post':62 'post-endpoint' 'premium':5,20,57,186 'premium API access' 'price':140,163 'prompt':229 'proof':112 'protocol':46 'quot':145 'rate':92,143 'render':224 'report':125 'request':39,63 'request/response':237 'requir':98 'return':197 'schema':238 'scheme':206 'second':211 'sentiment':132 'servic':181 'settl':66 'share':158 'simpli':100 'site':218 'specif':52,166 'summar':135 'technic':233 'text':134 'timeout':213 'token':144 'unit':85 'unknown':243 'upfront':95 'usdc':15,30,68 'usdc-settlement' 'util':150 'valid':109,152 'version':204 'via':10,25 'wallet':228 'web3':139 'well':200 'well-form':199 'x':104 'x-payment':103 'x402':11,26,45,110,202 'x402 API' 'x402-payment-gated'","prices":[{"id":"836e8d34-8936-4098-84b1-d013292b68b1","listingId":"75c15ea6-e841-433f-91d2-a5e5c19e9da0","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/payments/202","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:45.621Z"}],"sources":[{"listingId":"75c15ea6-e841-433f-91d2-a5e5c19e9da0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/202","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:45.621Z","lastSeenAt":"2026-04-23T16:07:16.224Z"}],"details":{"listingId":"75c15ea6-e841-433f-91d2-a5e5c19e9da0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/202 \\\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 in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/202"},{"claim":"All endpoints are priced at $0.02/request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/202"}],"useCases":["Programmatic access to a premium API endpoint without needing API keys or subscriptions","Agent-driven workflows that pay per call using USDC on Base","Testing x402 payment flows against a low-cost live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","AI agents that need keyless, pay-as-you-go API access","Low-cost per-request usage without rate limits or commitments"],"notFor":["Users who need detailed API documentation or guaranteed SLAs","Anyone requiring non-crypto payment methods","High-volume batch workloads where $0.02/request adds up quickly"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.98Z"},"updatedAt":"2026-04-23T16:07:16.224Z"}}