{"id":"bb56fa35-e6bf-4331-b319-8c39d8ca8f06","shortId":"cT2R3E","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 platform, which spans data & analytics, AI & machine learning, finance & Web3, and infrastructure utility categories — all priced at $0.02 per request.\n\nThe specific endpoint `/api/v1/payments/196` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The platform advertises a keyless, pay-per-use model: no API keys, no rate limits, no commitments. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a maximum cost of 20,000 base units (i.e., $0.02 given USDC's 6 decimals). The x402 challenge confirms the endpoint is live and accepts POST requests.\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, and no usage examples available from the crawl. The platform's landing page lists sibling endpoints for metrics, reports, sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and generation, all at the same $0.02 price point, but none have detailed documentation accessible without a wallet connection.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium access","pay-per-call API","USDC micropayment API","Base network API"],"warnings":["No documentation available — /docs, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","The exact functionality of /api/v1/payments/196 ('Premium API Access') is not described anywhere in the crawl","No OpenAPI spec or request/response schema available","No examples of successful responses are available"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/196","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/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no request/response schema, no examples, and the actual functionality behind 'Premium API Access' is undefined. Effectively a stub 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'/api/v1/payments/196':78 '/docs':161 '/pricing':163 '/readme':165 '0.02':12,28,72,138,224 '000':134 '0x8335':126 '20':133 '2913':127 '6':142 'Base network API' 'USDC micropayment API' 'accept':153 'access':7,23,40,83,232 'advertis':100 'ai':60 'analysi':206 'analyt':59 'api':6,22,39,82,109 'avail':190 'base':9,25,121,135 'beyond':95 'call':4,20 'categori':68 'challeng':87,146 'classif':209 'commit':115 'confirm':147 'connect':171,236 'content':177 'contract':125 'convers':217 'cost':131 'crawl':193 'data':58 'decim':143 'detail':230 'document':94,156,231 'embed':210 'endpoint':34,51,77,149,201 'exact':90 'exampl':189 'exchang':213 'extrem':158 'feed':212 'financ':63 'function':91 'generat':219 'geocod':215 'given':139 'i.e':137 'infrastructur':66 'key':110 'keyless':102 'label':80,97 'land':197 'learn':62 'limit':113 'list':199 'live':151 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':36 'machin':61 'mani':50 'maximum':130 'metric':203 'model':107 'network':122 'no-api-key' 'none':228 'offer':52 'one':48 'openapi':181 'page':166,198 'pay':2,18,104 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request' 'pay-per-us':103 'payment':44,116 'per':3,13,19,29,73,105 'platform':55,99,195 'point':226 'post':154 'post-endpoint' 'premium':5,21,38,81 'price':70,211,225 'prompt':173 'protocol':45 'provid':37 'rate':112,214 'render':168 'report':204 'request':14,30,74,155 'request/response':184 'schema':185 'sentiment':205 'settl':118 'sibl':200 'span':57 'spars':159 'spec':182 'specif':76 'summar':208 'text':207 'unit':136 'usag':188 'usdc':16,32,124,140 'usdc-base-network' 'use':106,123 'util':67 'valid':216 'via':10,26,41 'wallet':172,235 'web3':64 'without':233 'x402':11,27,43,86,145 'x402 premium access' 'x402-payment'","prices":[{"id":"846c6123-ff67-4e2e-9c56-99f80216e4da","listingId":"bb56fa35-e6bf-4331-b319-8c39d8ca8f06","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/196","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:50.424Z"}],"sources":[{"listingId":"bb56fa35-e6bf-4331-b319-8c39d8ca8f06","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/196","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:50.424Z","lastSeenAt":"2026-04-23T16:07:16.475Z"}],"details":{"listingId":"bb56fa35-e6bf-4331-b319-8c39d8ca8f06","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/196 \\\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":"Endpoint returns 402 with x402 challenge advertising USDC payment on Base network at maxAmountRequired 20000","source_url":"https://lowpaymentfee.com/api/v1/payments/196"},{"claim":"Platform lists APIs across data/analytics, AI/ML, finance/Web3, and infrastructure categories all at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"Platform advertises no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 with 6 decimals","source_url":"https://lowpaymentfee.com/api/v1/payments/196"}],"useCases":["Accessing premium API functionality with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API key management","Programmatic pay-as-you-go access to platform services"],"bestFor":["Developers wanting keyless, pay-per-use API access","AI agents that can settle x402 payments on Base","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation before purchasing","Anyone requiring free-tier or trial access to evaluate the endpoint","Use cases needing high-throughput with predictable flat-rate pricing"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.759Z"},"updatedAt":"2026-04-23T16:07:16.475Z"}}