{"id":"4915b9dd-d3bc-41b6-93e7-522d0af285c5","shortId":"ZTr3Bt","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 site hosts a collection of pay-per-request APIs spanning data & analytics, AI/ML inference, finance & Web3 data, and infrastructure utilities, all priced at $0.02 per request and settled in USDC on the Base network.\n\nThe specific endpoint `/api/v1/charges/238` is labeled \"Premium API Access\" in the x402 challenge. The challenge advertises a maxAmountRequired of 20,000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913, which uses 6 decimals), equating to $0.02 per call. Payment is made via the x402 exact scheme — no API keys, no rate limits, and no subscriptions required. The endpoint accepts POST requests and returns application/json.\n\nHowever, the actual functionality behind this particular charge ID (238) is unclear. The site lists many distinct API paths (analytics, AI, finance, utilities) but this endpoint's path (`/api/v1/charges/238`) does not directly correspond to any of those listed categories. Documentation pages (/docs, /pricing, /README) returned only a \"Connect wallet\" prompt with no substantive content. Without further documentation or example responses, the precise data or service returned by this endpoint cannot be confirmed.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["api-gateway","infrastructure"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","lowpaymentfee","Base network API","crypto-paid API"],"warnings":["No documentation available — /docs, /pricing, and /README all return only a 'Connect wallet' prompt with no content","The specific functionality of /api/v1/charges/238 ('Premium API Access') is undefined; it does not match any of the listed API paths on the homepage","No request body schema or response examples are available","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/charges/238","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/238","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, and no clarity on what 'Premium API Access' at /api/v1/charges/238 actually returns. All doc pages render only a wallet-connect 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'/docs':183 '/pricing':184 '/readme':185 '/request':13,28 '0.02':12,27,69,113 '000':100 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':106 '20':99 '238':151 '6':109 'Base network API' 'USDC micropayment API' 'accept':136 'access':7,22,38,88 'actual':144 'advertis':95 'ai':162 'ai/ml':58 'analyt':57,161 'api':6,21,37,54,87,125,159 'application/json':141 'asset':105 'base':9,24,78,101 'base-network' 'behind':146 'call':4,19,115 'cannot':211 'categori':180 'challeng':92,94 'charg':149 'collect':48 'confirm':213 'connect':189 'content':195 'correspond':174 'crypto-paid API' 'data':56,62,204 'decim':110 'direct':173 'distinct':158 'document':181,198 'endpoint':32,82,135,167,210 'equat':111 'exact':122 'exampl':200 'financ':60,163 'function':145 'host':46 'howev':142 'id':150 'infer':59 'infrastructur':64 'json-response' 'key':126 'label':85 'limit':129 'list':156,179 'lowpaymentfee' 'lowpaymentfee.com':34 'made':118 'mani':157 'maxamountrequir':97 'network':79 'no-api-key' 'page':182 'particular':148 'path':160,169 'pay':2,17,51 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':50 'payment':42,116 'per':3,18,52,70,114 'post':137 'precis':203 'premium':5,20,36,86 'price':67 'prompt':191 'protocol':43 'provid':35 'rate':128 'request':53,71,138 'requir':133 'respons':201 'return':140,186,207 'scheme':123 'servic':206 'settl':73 'site':45,155 'span':55 'specif':81 'subscript':132 'substant':194 'unclear':153 'unit':102 'usdc':15,30,75,104 'usdc-settlement' 'use':108 'util':65,164 'via':10,25,39,119 'wallet':190 'web3':61 'without':196 'x402':11,26,41,91,121 'x402 API' 'x402-payment'","prices":[{"id":"5715034e-5394-415b-b26f-1d16940d4cf1","listingId":"4915b9dd-d3bc-41b6-93e7-522d0af285c5","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/238","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:44:50.835Z"}],"sources":[{"listingId":"4915b9dd-d3bc-41b6-93e7-522d0af285c5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/charges/238","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:44:50.835Z","lastSeenAt":"2026-04-24T02:32:12.881Z"}],"details":{"listingId":"4915b9dd-d3bc-41b6-93e7-522d0af285c5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/charges/238 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-header>\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913) on Base network","source_url":"https://lowpaymentfee.com/api/v1/charges/238"},{"claim":"The site lists APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories, all priced at $0.02 per request","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, instant access, and Base network settlement","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages (/docs, /pricing, /README) returned only a 'Connect wallet' prompt","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Programmatic access to premium API services without subscription or API key management","Agent-driven workflows that need on-demand API calls settled in USDC on Base","Integrating pay-per-use endpoints into Web3 applications"],"bestFor":["Developers wanting zero-commitment, pay-as-you-go API access","AI agents with Base USDC wallets needing frictionless endpoint access","Prototyping and low-volume usage where subscriptions are overkill"],"notFor":["High-volume production workloads where per-call pricing becomes expensive","Users without a Base-compatible USDC wallet","Anyone needing detailed documentation or SLA guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:23.287Z"},"updatedAt":"2026-04-24T02:32:12.881Z"}}