{"id":"f2154b31-2cf0-41d3-900e-2fa296e29370","shortId":"HQpcT7","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":"lowpaymentfee.com hosts a collection of pay-per-request API endpoints gated by the x402 payment protocol. The specific endpoint at `/api/v1/messages/6` is labeled \"Premium API Access\" and accepts POST requests. Payment is settled on the Base network in USDC (contract 0x8335…2913) with a maximum charge of 20,000 base units, which equals $0.02 per request (USDC uses 6 decimals). No API keys, rate limits, or upfront commitments are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe broader lowpaymentfee.com platform advertises endpoints across four categories: Data & Analytics (metrics, reports, data export, insights), AI & Machine Learning (sentiment analysis, text summarization, classification, embeddings), Finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and Infrastructure utilities (geocoding, validation, conversion, generation). All listed endpoints share the same $0.02/request pricing model.\n\nThis particular endpoint (`/api/v1/messages/6`) does not have publicly documented request or response schemas beyond the x402 challenge metadata. The \"messages\" path suggests a messaging or content-retrieval resource, but the exact payload format and response structure are not specified in the available material. The x402 challenge confirms the endpoint is live and accepting payment-gated POST requests with a 300-second timeout window.","tags":[],"capabilities":["x402-payment-gated","pay-per-request","usdc-settlement","base-network","no-api-key","post-endpoint","json-response"],"categories":["api-gateway","crypto"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-gated endpoint"],"warnings":["No request or response schema is documented for /api/v1/messages/6","The exact purpose of the 'messages' resource is unknown — could be content retrieval, messaging, or a demo endpoint","No OpenAPI spec, README, or detailed docs were available from the crawl","Other pages (pricing, README, /api) returned only 'Connect wallet' with no content"],"endpointUrl":"https://lowpaymentfee.com/api/v1/messages/6","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The x402 challenge is live and pricing is clear ($0.02 USDC on Base), but there is no OpenAPI schema, no documented request/response format for this specific endpoint, and the crawled pages beyond the landing page returned only 'Connect wallet' with no useful content. The purpose of '/api/v1/messages/6' is 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'/request':13,28,165 '0.02':12,27,85,164 '000':80 '0x8335':72 '20':79 '2913':73 '300':229 '6':90 'Base network API' 'USDC micropayment API' 'accept':59,221 'access':7,22,57 'across':122 'advertis':120 'ai':132 'analysi':136 'analyt':126 'api':6,21,40,56,93 'attach':104 'avail':210 'base':9,24,67,81 'base-network' 'beyond':181 'broader':117 'call':4,19 'caller':102 'categori':124 'challeng':184,214 'charg':77 'classif':139 'collect':34 'commit':99 'confirm':215 'content':194 'content-retriev':193 'contract':71 'convers':156 'crypto-gated endpoint' 'data':125,129 'decim':91 'document':176 'embed':140 'endpoint':41,50,121,160,170,217 'equal':84 'estim':150 'exact':199 'exchang':145 'export':130 'feed':144 'financ':141 'format':201 'four':123 'gas':149 'gate':42,224 'generat':157 'geocod':154 'header':109 'host':32 'infrastructur':152 'insight':131 'json-response' 'key':94 'label':54 'learn':134 'limit':96 'list':159 'live':219 'lowpaymentfee' 'lowpaymentfee.com':31,118 'machin':133 'materi':211 'maximum':76 'messag':187,191 'metadata':185 'metric':127 'model':167 'network':68 'no-api-key' 'particular':169 'path':188 'pay':2,17,37 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request':36 'payload':200 'payment':46,62,108,114,223 'payment-g':222 'per':3,18,38,86 'platform':119 'post':60,225 'post-endpoint' 'premium':5,20,55 'premium API access' 'price':143,166 'proof':115 'protocol':47 'public':175 'quot':148 'rate':95,146 'report':128 'request':39,61,87,177,226 'requir':101 'resourc':196 'respons':179,203 'retriev':195 'schema':180 'second':230 'sentiment':135 'settl':64 'share':161 'simpli':103 'specif':49 'specifi':207 'structur':204 'suggest':189 'summar':138 'text':137 'timeout':231 'token':147 'unit':82 'upfront':98 'usdc':15,30,70,88 'usdc-settlement' 'use':89 'util':153 'valid':112,155 'via':10,25 'web3':142 'window':232 'x':107 'x-payment':106 'x402':11,26,45,113,183,213 'x402 API' 'x402-payment-gated'","prices":[{"id":"6410a10e-ca2f-43f2-871b-cd56ce2bb2fe","listingId":"f2154b31-2cf0-41d3-900e-2fa296e29370","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/6","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:26.991Z"}],"sources":[{"listingId":"f2154b31-2cf0-41d3-900e-2fa296e29370","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/messages/6","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:26.991Z","lastSeenAt":"2026-04-22T02:32:08.050Z"}],"details":{"listingId":"f2154b31-2cf0-41d3-900e-2fa296e29370","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/messages/6 \\\n  -H \"Content-Type: application/json\" \\\n  -H \"X-PAYMENT: <x402-payment-proof>\"","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 network","source_url":"https://lowpaymentfee.com/api/v1/messages/6"},{"claim":"All listed endpoints are priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/messages/6"},{"claim":"The platform offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"}],"useCases":["Accessing premium content or messages behind a per-request paywall","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic micropayment-gated data retrieval on Base"],"bestFor":["Developers wanting zero-signup, pay-per-use API access","AI agents with x402-compatible wallets on Base","Use cases requiring sub-dollar micropayments without subscriptions"],"notFor":["High-volume batch processing where per-request fees add up quickly","Users without a Base-network USDC wallet","Applications needing detailed API documentation or SLAs"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:00.072Z"},"updatedAt":"2026-04-22T02:32:08.050Z"}}