{"id":"e514528f-b4f7-4dd1-b790-0a1f0ff40a11","shortId":"PZtQwY","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/79` 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\nThe broader platform advertises endpoints for sentiment analysis, text summarization, classification, embeddings, price feeds, exchange rates, geocoding, validation, conversion, and data export — all at the same $0.02 price point. However, documentation beyond the landing page is extremely sparse: the /docs, /api, /pricing, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no usage examples available from the crawl.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","json-response","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","USDC pay-per-call","Base network API","micropayment API"],"warnings":["The exact functionality of /api/v1/payments/79 is unknown — 'Premium API Access' is the only description available.","All documentation pages (/docs, /api, /pricing, /README) render only 'Connect wallet' with no technical content.","No OpenAPI specification or request/response schema is available.","The endpoint path '/api/v1/payments/79' suggests a resource ID (79) that may be ephemeral or user-specific."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/79","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and confirms pricing and payment details, but the endpoint's actual functionality is entirely undocumented. No OpenAPI spec, no request/response schemas, no examples, and all documentation pages return only a wallet-connect prompt. The label 'Premium API Access' is generic and 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'/api/v1/payments/79':105 '/docs':204 '/pricing':206 '/readme':208 '/request':13,28 '0.02':12,27,81,148,191 '000':143 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':158 '20':142 '6':153 'Base network API' 'USDC pay-per-call' 'accept':132 'access':7,22,38,110 'address':157 'advertis':168 'ai':68 'analysi':172 'analyt':67 'api':6,21,37,64,93,109 'application/json':164 'avail':235 'base':9,24,89,144 'beyond':122,196 'broader':166 'call':4,19 'challeng':114,127 'classif':175 'collect':58 'commit':100 'confirm':128 'connect':214 'convers':183 'crawl':238 'data':66,185 'decim':154 'detail':221 'document':121,195,230 'embed':176 'endpoint':32,49,77,104,169 'exact':117 'exampl':234 'exchang':179 'export':186 'extrem':201 'feed':178 'financ':71 'function':118 'geocod':181 'host':56 'howev':194 'infrastructur':74 'json-response' 'key':94 'label':107,124 'land':198 'learn':70 'limit':97 'live':131 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34,53 'machin':69 'mani':48 'micropayment API' 'mime':161 'network':90 'no-api-key' 'offer':50 'one':46 'openapi':225 'page':199,209 'pay':2,17,61 'pay-per-cal':1,16 'pay-per-request':60 'payment':42,138 'per':3,18,62,82 'platform':54,167 'point':193 'post':133 'post-method' 'premium':5,20,36,108 'price':79,177,192 'prompt':216 'protocol':43 'provid':35 'rate':96,180 'render':211 'request':63,83,134 'request/response':228 'requir':101,136 'respons':160 'schema':229 'sentiment':171 'settl':84 'sinc':150 'span':65 'spars':202 'spec':226 'specif':103 'summar':174 'technic':220 'text':173 'type':162 'unit':145 'usag':233 'usd':149 'usdc':15,30,86,147,151 'usdc-base-network' 'use':152 'util':75 'valid':182 'via':10,25,39 'wallet':215 'web3':72 'x402':11,26,41,113,126 'x402 premium API' 'x402-payment'","prices":[{"id":"c908501d-b058-4836-bdf6-ba6f855e5b2b","listingId":"e514528f-b4f7-4dd1-b790-0a1f0ff40a11","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/79","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:57.500Z"}],"sources":[{"listingId":"e514528f-b4f7-4dd1-b790-0a1f0ff40a11","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/79","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:57.500Z","lastSeenAt":"2026-04-23T09:31:18.372Z"}],"details":{"listingId":"e514528f-b4f7-4dd1-b790-0a1f0ff40a11","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/79 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -d '{}'","exampleRequest":{"url":"https://lowpaymentfee.com/api/v1/payments/79","body":{},"method":"POST","headers":{"X-PAYMENT":"<x402-payment-token>","Content-Type":"application/json"}},"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The endpoint returns a 402 challenge with maxAmountRequired of 20000 base units of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/79"},{"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 & ML, 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/79"}],"useCases":["Accessing premium API functionality with per-request USDC micropayments on Base","Agent-driven API consumption without pre-registration or API keys","Programmatic pay-as-you-go access to a multi-category API platform"],"bestFor":["Developers wanting zero-commitment, pay-per-call API access","AI agents that can settle x402 payments in USDC on Base","Users who prefer no API key registration or rate limits"],"notFor":["Users needing detailed API documentation or OpenAPI specs before integrating","High-volume consumers who need bulk pricing or subscription discounts","Anyone unable to transact in USDC on the Base L2 network"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:05.55Z"},"updatedAt":"2026-04-23T09:31:18.372Z"}}