{"id":"93e339ff-8eca-427a-bac5-5209855b6102","shortId":"GbeFHw","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 collection 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/136` 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 spec, no request/response schema documentation, and no usage examples available. The platform's landing page lists sibling endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, and more, all at the same $0.02 price point. Without further documentation, the precise input parameters and response format for this particular endpoint remain unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","no-api-key"],"categories":["general","infrastructure"],"synonyms":["premium API","lowpaymentfee","x402 API","pay-per-call API","USDC API","Base network API","micropayment API"],"warnings":["The exact functionality of /api/v1/payments/136 is undocumented — 'Premium API Access' is the only description available.","All documentation pages (docs, API, pricing, README) render only a 'Connect wallet' prompt with no actual content.","No OpenAPI spec or request/response schema is available.","The relationship between this endpoint and the other listed APIs (analytics, AI, finance, utils) is unclear."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/136","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.250","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but there is zero documentation on what this endpoint actually does, what inputs it expects, or what it returns. The label 'Premium API Access' is generic and uninformative. No OpenAPI spec, no examples, and all doc pages are empty beyond a wallet connect 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'/request':13,28 '0.02':12,27,81,148,230 '000':143 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '20':142 '6':153 'Base network API' 'USDC API' 'accept':132 'access':7,22,38,110 'address':157 'ai':68 'analysi':214 'analyt':67 'api':6,21,37,64,93,109,174 'application/json':164 'avail':203 'base':9,24,89,144 'base-network' 'beyond':122 'call':4,19 'challeng':114,127 'classif':217 'collect':58 'commit':100 'confirm':128 'connect':183 'content':189 'data':66 'decim':154 'doc':173 'document':121,165,198,235 'embed':218 'endpoint':32,49,77,104,211,246 'exact':117 'exampl':202 'exchang':221 'extrem':170 'feed':220 'financ':71 'format':242 'function':118 'geocod':223 'host':56 'infrastructur':74 'input':238 'json-response' 'key':94 'label':107,124 'land':207 'learn':70 'limit':97 'list':209 'live':131 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'micropayment API' 'mime':161 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':193 'page':178,208 'paramet':239 'particular':245 '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':54,205 'point':232 'post':133 'precis':237 'premium':5,20,36,108 'premium API' 'price':79,175,219,231 'prompt':185 'protocol':43 'provid':35 'rate':96,222 'readm':177 'remain':247 'render':180 'request':63,83,134 'request/response':196 'requir':101,136 'respons':160,241 'schema':197 'sentiment':213 'settl':84 'sibl':210 'sinc':150 'site':168 'span':65 'spars':171 'spec':194 'specif':103 'summar':216 'text':215 'type':162 'unit':145 'unknown':248 'usag':201 'usd':149 'usdc':15,30,86,147,151 'usdc-settlement' 'use':152 'util':75 'via':10,25,39 'wallet':184 'web3':72 'without':233 'x402':11,26,41,113,126 'x402 API' 'x402-payment'","prices":[{"id":"985b3ff5-ab59-46bc-9ce4-d343bc74271b","listingId":"93e339ff-8eca-427a-bac5-5209855b6102","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/136","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:31.145Z"}],"sources":[{"listingId":"93e339ff-8eca-427a-bac5-5209855b6102","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/136","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:31.145Z","lastSeenAt":"2026-04-22T09:01:15.701Z"}],"details":{"listingId":"93e339ff-8eca-427a-bac5-5209855b6102","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/136 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"Endpoint returns 402 with x402 challenge requiring up to 20,000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/136"},{"claim":"Platform lists APIs across data & analytics, AI & ML, finance & Web3, and infrastructure categories, all at $0.02/request","source_url":"https://lowpaymentfee.com"},{"claim":"No API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/136"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments","Agent-driven API consumption without pre-registration or API keys","Testing x402 payment protocol integrations on Base"],"bestFor":["Developers exploring x402 pay-per-call patterns","Agents needing keyless, on-demand API access","Low-volume consumers who want no subscription commitment"],"notFor":["Users needing detailed API documentation or schemas before integrating","High-volume use cases where per-request pricing may add up","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.655Z"},"updatedAt":"2026-04-22T09:01:15.701Z"}}