{"id":"b9260e95-ce10-44d5-b07b-d8a9bc4f9418","shortId":"P6Vkve","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 lowpaymentfee.com platform, which hosts a suite of APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request, payable in USDC on the Base network.\n\nThe specific endpoint `/api/v1/payments/70` accepts POST requests and returns JSON. The x402 challenge confirms it is live, requiring a maximum of 20,000 base units of USDC (0x8335…2913 on Base, 6 decimals), which equals $0.02 per call. Payment is made via the x402 exact scheme to the payTo address. No API keys or rate limits are advertised; access is instant once payment is included in the request header.\n\nHowever, the actual functionality behind this specific `/payments/70` endpoint is unclear. The site's landing page lists many categorized APIs (analytics, AI, finance, utilities), but `/api/v1/payments/70` does not appear among them. The description field in the x402 challenge simply says \"Premium API Access\" without further detail. Documentation pages (`/docs`, `/pricing`, `/api`, `/README`) all returned only a \"Connect wallet\" prompt with no substantive content. Without documentation or an OpenAPI schema, the precise input parameters and response format for this endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","http-post"],"categories":["api","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment endpoint","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The exact functionality of /api/v1/payments/70 is unknown — it does not appear in the site's listed API catalog","All documentation pages (/docs, /pricing, /api, /README) returned no useful content","No OpenAPI schema or request/response examples are available","Input parameters and response format are entirely unspecified"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/70","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/70","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, confirming pricing and payment details. However, there is no OpenAPI schema, no documentation, no examples, and the actual functionality of this specific endpoint is undocumented. The docs/pricing/README pages are all empty beyond a wallet-connect prompt. This is effectively a stub 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'/api/v1/payments/70':88,179 '/docs':202 '/payments/70':161 '/pricing':203 '/readme':205 '/request':13,28 '0.02':12,27,75,120 '000':107 '0x8335':112 '20':106 '2913':113 '6':116 'Base network API' 'USDC micropayment endpoint' 'accept':89 'access':7,22,38,143,196 'actual':156 'address':134 'advertis':142 'ai':64,175 'among':183 'analyt':63,174 'api':6,21,37,60,136,173,195 'appear':182 'base':9,24,83,108,115 'behind':158 'call':4,19,122 'categor':172 'challeng':97,191 'confirm':98 'connect':210 'content':216 'crypto-paid API' 'data':62 'decim':117 'descript':186 'detail':199 'document':200,218 'endpoint':32,49,87,162,232 'equal':119 'exact':129 'field':187 'financ':67,176 'format':229 'function':157 'header':153 'host':56 'howev':154 'http-post' 'includ':149 'infrastructur':70 'input':225 'instant':145 'json':94 'json-response' 'key':137 'land':168 'learn':66 'limit':140 'list':170 'live':101 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':65 'made':125 'mani':48,171 'maximum':104 'network':84 'offer':50 'one':46 'openapi':221 'page':169,201 'paramet':226 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payabl':78 'payment':42,123,147 'payto':133 'per':3,18,76,121 'platform':54 'post':90 'precis':224 'premium':5,20,36,194 'premium API access' 'price':73 'prompt':212 'protocol':43 'provid':35 'rate':139 'remain':233 'request':77,91,152 'requir':102 'respons':228 'return':93,207 'say':193 'schema':222 'scheme':130 'simpli':192 'site':166 'span':61 'specif':86,160 'substant':215 'suit':58 'unclear':164 'unit':109 'unknown':234 'usdc':15,30,80,111 'usdc-base' 'util':71,177 'via':10,25,39,126 'wallet':211 'web3':68 'without':197,217 'x402':11,26,41,96,128,190 'x402 API' 'x402-payment'","prices":[{"id":"98bd78ba-379b-4d90-8dd7-4103c5a4ffda","listingId":"b9260e95-ce10-44d5-b07b-d8a9bc4f9418","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/70","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:53.215Z"}],"sources":[{"listingId":"b9260e95-ce10-44d5-b07b-d8a9bc4f9418","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/70","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:53.215Z","lastSeenAt":"2026-04-22T09:01:19.901Z"}],"details":{"listingId":"b9260e95-ce10-44d5-b07b-d8a9bc4f9418","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/70 \\\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 endpoint returns a 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/70"},{"claim":"The platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all priced at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"The site advertises no API keys, no rate limits, and instant access on the Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/70"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating pay-as-you-go API calls into agent workflows without API keys","Testing x402 payment protocol integrations against a live endpoint"],"bestFor":["Developers experimenting with x402 payment-gated APIs","Agents that can settle USDC payments on Base L2","Use cases requiring keyless, per-call API access"],"notFor":["Users who need detailed documentation or OpenAPI specs before integrating","Applications requiring free or fiat-only payment methods","Production workloads where the endpoint's exact behavior must be well-documented"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.801Z"},"updatedAt":"2026-04-22T09:01:19.901Z"}}