{"id":"1549532e-7006-4a73-8a46-a3c35d8aabb3","shortId":"Hgyvf9","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints accessible via the x402 protocol on the Base network. The specific endpoint at `/api/v1/charges/105` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 per call (USDC uses 6 decimals). No API keys or rate limits are advertised — 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.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawled material. The specific functionality behind `/api/v1/charges/105` (\"Premium API Access\") is not described beyond its title, making it unclear what data or service it returns.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-endpoint"],"categories":["api-gateway","infrastructure"],"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, /pricing, /api, and /README pages all show only 'Connect wallet' with no content","No OpenAPI or schema definition found for any endpoint","The specific functionality of /api/v1/charges/105 ('Premium API Access') is not described — unclear what it returns","No request body schema or response schema documented anywhere in crawled material","Cannot verify that the advertised AI, finance, data, and utility endpoints actually function"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/105","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (returns a valid 402 x402 challenge) and pricing is clear at $0.02/request in USDC on Base. However, there is no documentation, no OpenAPI schema, no request/response examples, and the specific purpose of /api/v1/charges/105 is undefined beyond its title. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/charges/105':57,212 '/docs':173 '/pricing':174 '/readme':177 '/request':166 '0.02':12,28,88,165 '000':83 '0x8335':73 '20':82 '2913':74 '6':93 'Base network API' 'USDC micropayment API' 'accept':64 'access':7,23,44,62,215 'across':123 'advertis':102,121 'ai':133 'amount':80 'analysi':137 'analyt':127 'api':6,22,42,61,96,214 'attach':105 'avail':203 'base':9,25,51,76,84 'base-network' 'behind':211 'beyond':219 'broader':118 'call':4,20,90 'caller':103 'categori':125 'classif':140 'collect':36 'connect':183 'content':189 'contract':72 'convers':157 'crawl':206 'crypto-paid API' 'data':126,130,226 'decim':94 'describ':218 'document':168,198 'embed':141 'endpoint':43,55,122,161 'equal':87 'estim':151 'exampl':202 'exchang':146 'export':131 'extrem':170 'feed':145 'financ':142 'four':124 'function':210 'gas':150 'generat':158 'geocod':155 'header':110 'host':34 'infrastructur':153 'insight':132 'key':97 'label':59 'learn':135 'limit':100 'list':160 'lowpaymentfee' 'lowpaymentfee.com':33,119 'machin':134 'make':222 'materi':207 'maximum':79 'metric':128 'network':52 'no-api-key' 'openapi':193 'page':178 'pay':2,18,39 'pay-per-cal':1,17 'pay-per-call API' 'pay-per-request':38 'payment':67,109,115 'per':3,13,19,29,40,89 'platform':120 'post':65 'post-endpoint' 'premium':5,21,60,213 'premium API access' 'price':144,167 'prompt':185 'proof':116 'protocol':48 'quot':149 'rate':99,147 'render':180 'report':129 'request':14,30,41,66 'request/response':196 'return':230 'schema':197 'sentiment':136 'servic':228 'settl':69 'share':162 'simpli':104 'spars':171 'spec':194 'specif':54,209 'summar':139 'text':138 'titl':221 'token':148 'unclear':224 'unit':85 'usag':201 'usdc':16,32,71,91 'usdc-settlement' 'use':92 'util':154 'valid':113,156 'via':10,26,45 'wallet':184 'web3':143 'x':108 'x-payment':107 'x402':11,27,47,114 'x402 API' 'x402-payment'","prices":[{"id":"b0ab5ec8-c500-47ff-a107-42df577b29f8","listingId":"1549532e-7006-4a73-8a46-a3c35d8aabb3","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/105","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:12.788Z"}],"sources":[{"listingId":"1549532e-7006-4a73-8a46-a3c35d8aabb3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/105","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:12.788Z","lastSeenAt":"2026-04-24T05:32:02.655Z"}],"details":{"listingId":"1549532e-7006-4a73-8a46-a3c35d8aabb3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/105 \\\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":"Endpoint returns 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/105"},{"claim":"maxAmountRequired is 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913), equaling $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/105"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"Platform lists endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /api, /README) render only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Accessing premium API services with per-call USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to data, AI, finance, or utility endpoints"],"bestFor":["Developers wanting keyless, pay-per-use API access settled in USDC on Base","AI agents that can attach x402 payment headers autonomously","Users who prefer crypto micropayments over subscription billing"],"notFor":["Users who need detailed API documentation or OpenAPI specs before integrating","Anyone requiring fiat-only payment methods","High-volume consumers who would benefit from bulk pricing or subscriptions"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.053Z"},"updatedAt":"2026-04-24T05:32:02.655Z"}}