{"id":"bb6fc2c4-c05c-465c-9c81-1d2e377fe39c","shortId":"n947pj","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 catalog of pay-per-request APIs spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints are priced at $0.02 per request, settled in USDC on the Base network, with no API keys, no rate limits, and no commitments required.\n\nThe specific endpoint `/api/v1/payments/270` is labeled \"Premium API Access\" in the x402 challenge but its exact functionality is not documented beyond that label. The x402 challenge confirms it is live, accepts POST requests, and requires a payment of up to 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals) to the address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3`. The response MIME type is `application/json`.\n\nDocumentation on the site is extremely sparse — the docs, API, pricing, and README pages all render only a \"Connect wallet\" prompt with no further content. There is no OpenAPI schema, no request/response examples, and no detailed description of what this particular endpoint returns. The platform's landing page lists sibling endpoints for analytics, AI inference, finance data, and utilities, all at the same $0.02 price point, but no specifics are available for this `/payments/270` route.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["payments","general"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC micropayment API","Base network API","pay-per-call API"],"warnings":["No documentation available — docs, API, pricing, and README pages all show only 'Connect wallet' with no content","The exact functionality of /api/v1/payments/270 is undocumented; 'Premium API Access' is the only descriptor","No OpenAPI schema or request/response examples are provided","No information on uptime, SLAs, or rate limits beyond the marketing claim of 'no rate limits'"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/270","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/270","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The endpoint is live and returns a valid x402 challenge, but there is no documentation, no OpenAPI schema, no request/response examples, and the purpose of this specific '/payments/270' route is unclear beyond the generic 'Premium API Access' label. Effectively a stub 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'/payments/270':238 '/request':13,28 '0.02':12,27,81,148,228 '000':143 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '20':142 '6':153 'Base network API' 'USDC micropayment API' 'accept':132 'access':7,22,38,110 'address':157 'ai':68,218 'analyt':67,217 'api':6,21,37,64,93,109,174 'application/json':164 'avail':235 'base':9,24,89,144 'beyond':122 'call':4,19 'catalog':58 'challeng':114,127 'commit':100 'confirm':128 'connect':183 'content':189 'data':66,221 'decim':154 'descript':201 'detail':200 'doc':173 'document':121,165 'endpoint':32,49,77,104,206,215 'exact':117 'exampl':197 'extrem':170 'financ':71,220 'function':118 'host':56 'infer':219 'infrastructur':74 'json-response' 'key':94 'label':107,124 'land':211 'learn':70 'limit':97 'list':213 'live':131 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'mime':161 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':193 'page':178,212 'particular':205 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':60 'payment':42,138 'per':3,18,62,82 'platform':54,209 'point':230 'post':133 'post-method' 'premium':5,20,36,108 'price':79,175,229 'prompt':185 'protocol':43 'provid':35 'rate':96 'readm':177 'render':180 'request':63,83,134 'request/response':196 'requir':101,136 'respons':160 'return':207 'rout':239 'schema':194 'settl':84 'sibl':214 'sinc':150 'site':168 'span':65 'spars':171 'specif':103,233 'type':162 'unit':145 'usd':149 'usdc':15,30,86,147,151 'usdc-base-network' 'use':152 'util':75,223 'via':10,25,39 'wallet':184 'web3':72 'x402':11,26,41,113,126 'x402 premium API' 'x402-payment'","prices":[{"id":"7b779e6e-3119-4f3b-bcef-02c8d7493cdd","listingId":"bb6fc2c4-c05c-465c-9c81-1d2e377fe39c","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/270","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:01.437Z"}],"sources":[{"listingId":"bb6fc2c4-c05c-465c-9c81-1d2e377fe39c","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/270","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:01.437Z","lastSeenAt":"2026-04-22T07:31:21.097Z"}],"details":{"listingId":"bb6fc2c4-c05c-465c-9c81-1d2e377fe39c","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/270 \\\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 402 x402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/270"},{"claim":"All endpoints are priced at $0.02 per request with no API keys, no rate limits, and instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"The platform offers APIs across Data & Analytics, AI & Machine Learning, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/270"}],"useCases":["Accessing a premium API endpoint with per-request USDC micropayments on Base","Integrating x402-compatible payment flows into agent workflows","Testing x402 protocol payment challenges against a live endpoint"],"bestFor":["Developers experimenting with x402 payment protocol integrations","Agents that need keyless, pay-per-call API access on Base","Low-volume consumers who prefer no subscriptions or commitments"],"notFor":["Users who need detailed API documentation or schemas before integrating","High-volume production workloads requiring SLAs or guaranteed uptime","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:08.296Z"},"updatedAt":"2026-04-22T07:31:21.097Z"}}