{"id":"d2bd21d4-7bd3-4602-920f-a6c30cf626b5","shortId":"waVFyw","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/charges/119`) is labeled \"Premium API Access\" and accepts POST requests. Payment is settled in USDC (contract `0x8335…2913` on Base) at a maximum cost of 20,000 base units, which equals $0.02 per call (USDC uses 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.\n\nDocumentation is extremely sparse — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. 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/119` (\"Premium API Access\") is not described beyond its title, making it unclear what data or service it returns.","tags":[],"capabilities":["x402-payment","per-request-billing","usdc-settlement","base-network","post-endpoint","no-api-key","no-rate-limits"],"categories":["api-gateway","payments"],"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 all show only 'Connect wallet' with no content","No OpenAPI or schema describing request parameters or response format for this endpoint","The specific purpose of /api/v1/charges/119 ('Premium API Access') is not explained anywhere in the crawled material","Cannot verify what data or service is actually returned upon successful payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/119","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/119","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 ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no examples. The actual functionality behind 'Premium API Access' at /api/v1/charges/119 is completely undescribed. The docs, pricing, and README pages are all blank beyond a wallet-connect 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'/api/v1/charges/119':54,212 '/docs':172 '/pricing':173 '/readme':176 '/request':13,28,165 '0.02':12,27,85,164 '000':80 '0x8335':70 '20':79 '2913':71 '6':90 'Base network API' 'USDC micropayment API' 'accept':61 'access':7,22,59,215 'across':122 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':6,21,40,58,93,214 'attach':104 'avail':203 'base':9,24,49,73,81 'base-network' 'behind':211 'beyond':219 'broader':117 'call':4,19,87 'caller':102 'categori':124 'classif':139 'collect':34 'commit':99 'connect':182 'contract':69 'convers':156 'cost':77 'crawl':206 'crypto-paid API' 'data':125,129,226 'decim':91 'describ':218 'detail':189 'document':167,198 'embed':140 'endpoint':41,53,121,160 'equal':84 'estim':150 'exampl':202 'exchang':145 'export':130 'extrem':169 'feed':144 'financ':141 'four':123 'function':210 'gas':149 'gate':42 'generat':157 'geocod':154 'header':109 'host':32 'infrastructur':152 'insight':131 'key':94 'label':56 'learn':134 'limit':96 'list':159 'lowpaymentfee' 'lowpaymentfee.com':31,118 'machin':133 'make':222 'materi':207 'maximum':76 'metric':127 'network':50 'no-api-key' 'no-rate-limits' 'openapi':193 'page':177 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payment':64,108,114 'per':3,18,38,86 'per-request-billing' 'platform':119 'post':62 'post-endpoint' 'premium':5,20,57,213 'premium API access' 'price':143,166 'prompt':184 'proof':115 'protocol':46 'quot':148 'rate':95,146 'render':179 'report':128 'request':39,63 'request/response':196 'requir':101 'return':230 'schema':197 'sentiment':135 'servic':228 'settl':66 'share':161 'simpli':103 'spars':170 'spec':194 'specif':52,209 'summar':138 'technic':188 'text':137 'titl':221 'token':147 'unclear':224 'unit':82 'upfront':98 'usag':201 'usdc':15,30,68,88 'usdc-settlement' 'use':89 'util':153 'valid':112,155 'via':10,25 'wallet':183 'web3':142 'x':107 'x-payment':106 'x402':11,26,45,113 'x402 API' 'x402-payment'","prices":[{"id":"2aaa208b-7fb9-4080-b273-74fba0b7885f","listingId":"d2bd21d4-7bd3-4602-920f-a6c30cf626b5","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/119","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:05.516Z"}],"sources":[{"listingId":"d2bd21d4-7bd3-4602-920f-a6c30cf626b5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/119","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:05.516Z","lastSeenAt":"2026-04-24T06:32:00.994Z"}],"details":{"listingId":"d2bd21d4-7bd3-4602-920f-a6c30cf626b5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/119 \\\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 HTTP 402 with x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/119"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/charges/119"},{"claim":"Platform advertises $0.02/request pricing with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/charges/119"},{"claim":"Docs, pricing, API, and README pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Agents that need to call APIs without pre-registering for API keys","Programmatic access to paid endpoints using on-chain USDC micropayments","Demonstrating x402 protocol integration for pay-per-request services"],"bestFor":["Developers exploring x402 protocol-based API monetization","AI agents with Base-network USDC wallets needing keyless API access","Low-volume, pay-as-you-go API consumption at $0.02/call"],"notFor":["Users who need detailed API documentation or response schemas before integrating","High-volume consumers who need bulk pricing or subscription plans","Callers without a Base-network USDC wallet or x402-compatible client"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:25.4Z"},"updatedAt":"2026-04-24T06:32:00.994Z"}}