{"id":"fd4a2c51-40ab-4c8e-844e-fd12ccdefae3","shortId":"EcxKss","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. It is one of many endpoints offered by the provider, which spans categories including data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, payable in USDC on the Base network with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/224` returned a live 402 challenge confirming x402 version 1 support. The challenge specifies an exact payment scheme on Base, with a max amount of 20,000 base units of USDC (0x8335…2913), which equals $0.02 given USDC's 6 decimals. Payment is sent to address 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout. The endpoint accepts HTTP POST and returns application/json.\n\nHowever, the actual functionality behind this specific `/payments/224` path is unclear. The provider's landing page lists numerous API categories (metrics, reports, sentiment analysis, summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, etc.), but `/api/v1/payments/224` does not appear among them. There is no OpenAPI spec, no detailed documentation (docs/pricing/README pages all render only a \"Connect wallet\" prompt), and no request/response schema beyond the x402 challenge's outputSchema stub. The endpoint is live and the payment mechanism is well-defined, but what data or service is returned after payment remains unspecified.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","http-post","json-response"],"categories":["payments","general"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific endpoint /api/v1/payments/224 is not listed among the provider's advertised APIs — its purpose is unclear.","No OpenAPI specification or detailed documentation is available; docs, pricing, and README pages all show only 'Connect wallet'.","No request body schema or response schema is documented beyond the x402 challenge metadata.","The provider lists many diverse API categories (AI, finance, analytics, utilities) but provides no evidence any of them return real data."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/224","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/224","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, the specific functionality of /api/v1/payments/224 is undocumented, there is no OpenAPI spec, no request/response schema, and all documentation pages render only a wallet-connect prompt. The listing is essentially a stub with a working payment gate but unknown 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'/payments/224':164 '/request':13,28 '0.02':12,27,73,132 '000':123 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':143 '0x8335':128 '1':106 '20':122 '2913':129 '300':146 '402':101 '6':136 'Base network API' 'USDC micropayment endpoint' 'accept':151 'access':7,22,38 'actual':159 'address':142 'ai':60 'among':196 'amount':120 'analysi':180 'analyt':59 'api':6,21,37,85,175 'appear':195 'application/json':156 'base':9,24,81,116,124 'behind':161 'beyond':219 'call':4,19 'categori':56,176 'challeng':102,109,222 'classif':182 'commit':92 'confirm':103 'connect':212 'crypto-paid API' 'data':58,240 'decim':137 'defin':237 'detail':204 'docs/pricing/readme':206 'document':205 'embed':183 'endpoint':32,49,69,96,150,227 'equal':131 'etc':190 'exact':112 'exchang':186 'feed':185 'financ':63 'function':160 'geocod':188 'given':133 'howev':157 'http':152 'http-post' 'includ':57 'infrastructur':66 'json-response' 'key':86 'land':171 'learn':62 'limit':89 'list':173 'live':100,229 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':61 'mani':48 'max':119 'mechan':233 'metric':177 'network':82 'no-api-key' 'numer':174 'offer':50 'one':46 'openapi':201 'outputschema':224 'page':172,207 'path':165 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':76 'payment':42,113,138,232,246 'per':3,18,74 'post':153 'premium':5,20,36 'premium API access' 'price':71,184 'prompt':214 'protocol':43 'provid':35,53,169 'rate':88,187 'remain':247 'render':209 'report':178 'request':75 'request/response':217 'requir':93 'return':98,155,244 'schema':218 'scheme':114 'second':147 'sent':140 'sentiment':179 'servic':242 'span':55 'spec':202 'specif':95,163 'specifi':110 'stub':225 'summar':181 'support':107 'timeout':148 'unclear':167 'unit':125 'unspecifi':248 'usdc':15,30,78,127,134 'usdc-base' 'util':67 'valid':189 'version':105 'via':10,25,39 'wallet':213 'web3':64 'well':236 'well-defin':235 'x402':11,26,41,104,221 'x402 API' 'x402-payment'","prices":[{"id":"43461006-09d1-4caf-afa7-821f28edbd59","listingId":"fd4a2c51-40ab-4c8e-844e-fd12ccdefae3","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/224","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:54.147Z"}],"sources":[{"listingId":"fd4a2c51-40ab-4c8e-844e-fd12ccdefae3","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/224","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:54.147Z","lastSeenAt":"2026-04-22T07:01:08.209Z"}],"details":{"listingId":"fd4a2c51-40ab-4c8e-844e-fd12ccdefae3","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/224 \\\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":"The endpoint returns a live 402 challenge with x402 version 1, exact scheme on Base, maxAmountRequired 20000 USDC base units","source_url":"https://lowpaymentfee.com/api/v1/payments/224"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/224"},{"claim":"All endpoints priced at $0.02/request with no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Provider lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Programmatic access to a paid API endpoint without needing API keys or subscriptions","Agent-driven workflows that settle per-call payments in USDC on Base","Testing x402 payment protocol integrations with a low-cost live endpoint"],"bestFor":["Developers exploring x402 payment protocol integration","AI agents that need keyless, pay-per-use API access","Low-cost per-request API consumption settled on-chain"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Use cases requiring known, well-documented response schemas","High-volume workloads where $0.02/request adds up without bulk discounts"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.591Z"},"updatedAt":"2026-04-22T07:01:08.209Z"}}