{"id":"b9a8f926-6006-4a54-8bd4-b2b642785001","shortId":"cbdkZ6","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. The specific resource path `/api/v1/messages/165` appears to be one entry in a broader catalog of pay-per-request APIs offered by the provider, spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities. All endpoints on the platform are priced at $0.02 per request, payable in USDC on the Base network with no API keys, rate limits, or commitments required.\n\nThe x402 challenge confirms the endpoint is live and accepts POST requests. Payment is settled on-chain using USDC (contract 0x8335…2913 on Base) with a maximum amount of 20,000 base units, which equals $0.02 (USDC uses 6 decimals). The payment timeout is 300 seconds. The response MIME type is application/json.\n\nWhile the provider's landing page lists many endpoint categories (sentiment analysis, text summarization, geocoding, price feeds, etc.), this specific resource (`/api/v1/messages/165`) is labeled only as \"Premium API Access\" with no further documentation about what it returns or what input it expects. There is no OpenAPI spec, no request/response schema documentation, and the /api, /pricing, and /README pages all resolve to a minimal \"Connect wallet\" prompt. The actual functionality behind this particular endpoint is unclear from available materials.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","json-response","no-api-key","post-method"],"categories":["general","api-marketplace"],"synonyms":["lowpaymentfee","low payment fee API","x402 premium API","pay-per-call API","USDC API access","Base network API","micropayment API"],"warnings":["No OpenAPI or schema documentation available for this endpoint","The specific purpose of /api/v1/messages/165 is undocumented — 'Premium API Access' is generic","The /api, /pricing, and /README pages all return only a 'Connect wallet' prompt with no useful content","Cannot verify what data or service this endpoint actually provides"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/165","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/messages/165","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live (402 challenge confirmed) and pricing is clear ($0.02 USDC on Base), but there is no documentation, no OpenAPI spec, no request/response schema, and the specific functionality of /api/v1/messages/165 is entirely undocumented. The broader site lists many endpoint categories but provides no detail on any of 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'/api/v1/messages/165':48,180 '/pricing':213 '/readme':215 '/request':13,28 '0.02':12,27,87,142 '000':137 '0x8335':127 '20':136 '2913':128 '300':151 '6':145 'Base network API' 'USDC API access' 'accept':115 'access':7,22,38,187 'actual':226 'ai':71 'amount':134 'analysi':170 'analyt':70 'api':6,21,37,63,99,186 'appear':49 'application/json':158 'avail':235 'base':9,24,95,130,138 'behind':228 'broader':56 'call':4,19 'catalog':57 'categori':168 'chain':123 'challeng':108 'commit':104 'confirm':109 'connect':222 'contract':126 'data':69 'decim':146 'document':191,209 'endpoint':32,80,111,167,231 'entri':53 'equal':141 'etc':176 'expect':200 'feed':175 'financ':74 'function':227 'geocod':173 'infrastructur':77 'input':198 'json-response' 'key':100 'label':182 'land':163 'learn':73 'limit':102 'list':165 'live':113 'low payment fee API' 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':72 'mani':166 'materi':236 'maximum':133 'micropayment API' 'mime':155 'minim':221 'network':96 'no-api-key' 'offer':64 'on-chain':121 'one':52 'openapi':204 'page':164,216 'particular':230 'path':47 'pay':2,17,60 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':59 'payabl':90 'payment':42,118,148 'per':3,18,61,88 'platform':83 'post':116 'post-method' 'premium':5,20,36,185 'price':85,174 'prompt':224 'protocol':43 'provid':35,67,161 'rate':101 'request':62,89,117 'request/response':207 'requir':105 'resolv':218 'resourc':46,179 'respons':154 'return':195 'schema':208 'second':152 'sentiment':169 'settl':120 'span':68 'spec':205 'specif':45,178 'summar':172 'text':171 'timeout':149 'type':156 'unclear':233 'unit':139 'usdc':15,30,92,125,143 'usdc-base' 'use':124,144 'util':78 'via':10,25,39 'wallet':223 'web3':75 'x402':11,26,41,107 'x402 premium API' 'x402-payment'","prices":[{"id":"69929f1c-a142-4ef3-93ab-d930bb45306e","listingId":"b9a8f926-6006-4a54-8bd4-b2b642785001","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/messages/165","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.170Z"}],"sources":[{"listingId":"b9a8f926-6006-4a54-8bd4-b2b642785001","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/165","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.170Z","lastSeenAt":"2026-04-22T02:32:06.424Z"}],"details":{"listingId":"b9a8f926-6006-4a54-8bd4-b2b642785001","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/165 \\\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 challenge with maxAmountRequired of 20000 base units in USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/messages/165"},{"claim":"All endpoints on the platform are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base network","source_url":"https://lowpaymentfee.com/api/v1/messages/165"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, on-demand API calls","Programmatic access to paid endpoints without subscription commitments"],"bestFor":["Developers or agents wanting frictionless pay-per-use API access","x402-compatible clients on the Base network","Low-volume or sporadic API consumers who prefer no subscriptions"],"notFor":["Users needing detailed API documentation or guaranteed SLAs","High-volume consumers who would benefit from bulk pricing or subscriptions","Anyone without a Base-network USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:01.461Z"},"updatedAt":"2026-04-22T02:32:06.424Z"}}