{"id":"1b3d4922-0060-48fb-80d4-273b0678d4a4","shortId":"NpvMVC","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":"This endpoint at lowpaymentfee.com provides \"Premium API Access\" via the x402 payment protocol. The specific resource at `/api/v1/charges/273` accepts POST requests and charges up to 20,000 base units of USDC (0x8335…2913) on the Base network, which equals $0.02 per request (USDC uses 6 decimals). Payment is handled inline via the X-PAYMENT header with no API keys or accounts required.\n\nThe broader lowpaymentfee.com platform advertises a suite of pay-per-call APIs 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 endpoints are listed at $0.02 per request with no rate limits or minimum commitments.\n\nHowever, the specific endpoint `/api/v1/charges/273` is labeled only as \"Premium API Access\" with no further documentation on what data or functionality it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional technical detail. Without an OpenAPI schema, example responses, or detailed documentation, it is unclear what payload this particular endpoint produces. Agents should treat this as a generic x402-gated resource until more documentation becomes available.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-call","no-api-key","post-endpoint","json-response"],"categories":["api","infrastructure"],"synonyms":["x402 API","pay-per-request API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet'","The specific functionality of /api/v1/charges/273 ('Premium API Access') is not described anywhere","No OpenAPI schema or example responses provided","No input schema documented — unclear what POST body is expected"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/273","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/273","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 402 with a valid x402 challenge) and pricing is clear ($0.02 USDC on Base). However, there is no OpenAPI schema, no example request/response, and the docs pages are empty beyond a wallet-connect prompt. The specific functionality of /api/v1/charges/273 is undocumented, making this effectively a stub 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'/request':13,28 '0.02':12,27,70,148 '000':57 '0x8335':62 '20':56 '2913':63 '6':75 'Base network API' 'USDC micropayment API' 'accept':49 'access':7,22,38,169 'account':92 'across':107 'addit':199 'advertis':98 'agent':220 'ai':117 'analysi':121 'analyt':111 'api':6,21,37,89,106,168,185 'avail':235 'base':9,24,58,66 'becom':234 'broader':95 'call':4,19,105 'categori':109 'charg':53 'classif':124 'commit':157 'connect':194 'convers':141 'crypto-paid API' 'data':110,114,176 'decim':76 'detail':201,209 'doc':182 'document':173,210,233 'embed':125 'endpoint':32,144,161,218 'equal':69 'estim':135 'exampl':206 'exchang':130 'export':115 'feed':129 'financ':126 'four':108 'function':178 'gas':134 'gate':229 'generat':142 'generic':226 'geocod':139 'handl':79 'header':86 'howev':158 'infrastructur':137 'inlin':80 'insight':116 'json-response' 'key':90 'label':164 'learn':119 'limit':154 'list':146 'lowpaymentfee' 'lowpaymentfee.com':34,96 'machin':118 'metric':112 'minimum':156 'network':67 'no-api-key' 'openapi':204 'page':186 'particular':217 'pay':2,17,103 'pay-per-cal':1,16,102 'pay-per-call' 'pay-per-request API' 'payload':215 'payment':42,77,85 'per':3,18,71,104,149 'platform':97 'post':50 'post-endpoint' 'premium':5,20,36,167 'premium API access' 'price':128,183 'produc':219 'prompt':196 'protocol':43 'provid':35 'quot':133 'rate':131,153 'render':191 'report':113 'request':51,72,150 'requir':93 'resourc':46,230 'respons':207 'return':180 'schema':205 'sentiment':120 'site':189 'specif':45,160 'suit':100 'summar':123 'technic':200 'text':122 'token':132 'treat':222 'unclear':213 'unit':59 'usdc':15,30,61,73 'usdc-base' 'use':74 'util':138 'valid':140 'via':10,25,39,81 'wallet':195 'web3':127 'without':202 'x':84 'x-payment':83 'x402':11,26,41,228 'x402 API' 'x402-gated':227 'x402-payment'","prices":[{"id":"83d8fcc4-6acb-4652-aa94-efbbf8fc063c","listingId":"1b3d4922-0060-48fb-80d4-273b0678d4a4","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/273","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:52.016Z"}],"sources":[{"listingId":"1b3d4922-0060-48fb-80d4-273b0678d4a4","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/273","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:52.016Z","lastSeenAt":"2026-04-22T11:31:33.360Z"}],"details":{"listingId":"1b3d4922-0060-48fb-80d4-273b0678d4a4","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/273 \\\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 accepting USDC on Base network at maxAmountRequired 20000 base units","source_url":"https://lowpaymentfee.com/api/v1/charges/273"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/charges/273"},{"claim":"All listed APIs priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Platform offers APIs across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a pay-per-call API without needing API keys or subscriptions","Agent-driven workflows that settle per-request payments in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers experimenting with x402 payment flows","AI agents that need keyless, pay-as-you-go API access","Low-cost per-call usage without rate limits or commitments"],"notFor":["Users who need detailed documentation or guaranteed SLAs before integrating","High-volume batch processing where per-call pricing may add up","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.23Z"},"updatedAt":"2026-04-22T11:31:33.360Z"}}