{"id":"eef17b13-a068-4656-9b58-54f1c8a01975","shortId":"7a9Py5","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 is one of many x402-gated API endpoints offered by the provider. The specific path `/api/v1/payments/18` is labeled \"Premium API Access\" and accepts POST requests, settling payments in USDC on the Base network. The x402 challenge advertises a maxAmountRequired of 20,000 base units of USDC (6 decimals), which equals $0.02 per request — consistent with the provider's uniform $0.02/request pricing across all their endpoints.\n\nThe provider's landing page lists four categories of APIs: 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 (geocoding, validation, conversion, generation). All endpoints are priced at $0.02 per request with no API keys, no rate limits, and no minimum commitments required. However, the specific functionality behind the `/api/v1/payments/18` path is not documented beyond its \"Premium API Access\" label, and the docs, pricing, and API pages all render only a \"Connect wallet\" prompt with no further detail.\n\nThe endpoint is live and returns a valid x402 challenge. Payment is made via the x402 exact scheme to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using USDC (`0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913`) on Base, with a 300-second timeout. No OpenAPI schema, request/response examples, or detailed documentation are available, so the actual data returned by this endpoint after payment is unknown.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","no-api-key","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["The specific functionality of /api/v1/payments/18 is undocumented — 'Premium API Access' is the only label provided.","All documentation pages (docs, pricing, API, README) render only 'Connect wallet' with no usable content.","No OpenAPI spec, request schema, or response schema is available — callers cannot know what to send or what they will receive.","No rate limit or SLA information is published."],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/18","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.350","qualityRationale":"The endpoint is live and returns a valid x402 challenge with clear pricing ($0.02 USDC on Base). However, there is no OpenAPI schema, no request/response examples, and no documentation beyond a label. The actual functionality behind '/api/v1/payments/18' is entirely opaque — docs pages render only 'Connect wallet' with no 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'/request':13,28,96 '0.02':12,27,86,95,149 '000':77 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':219 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':222 '20':76 '300':227 '6':82 'Base network API' 'USDC micropayment API' 'accept':58 'access':7,22,56,179 'across':98 'actual':242 'address':218 'advertis':72 'ai':119 'analysi':123 'analyt':113 'api':6,21,42,55,111,154,178,186 'avail':239 'base':9,24,67,78,224 'base-network' 'behind':168 'beyond':175 'call':4,19 'categori':109 'challeng':71,208 'classif':126 'commit':162 'connect':192 'consist':89 'convers':142 'crypto-paid API' 'data':112,116,243 'decim':83 'detail':198,236 'doc':183 'document':174,237 'embed':127 'endpoint':32,43,101,145,200,247 'equal':85 'estim':137 'exact':215 'exampl':234 'exchang':132 'export':117 'feed':131 'financ':128 'four':108 'function':167 'gas':136 'gate':41 'generat':143 'geocod':140 'howev':164 'infrastructur':139 'insight':118 'key':155 'label':53,180 'land':105 'learn':121 'limit':158 'list':107 'live':202 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':120 'made':211 'mani':38 'maxamountrequir':74 'metric':114 'minimum':161 'network':68 'no-api-key' 'offer':44 'one':36 'openapi':231 'page':106,187 'path':50,171 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':62,209,249 'per':3,18,87,150 'post':59 'post-method' 'premium':5,20,54,177 'premium API access' 'price':97,130,147,184 'prompt':194 'provid':47,92,103 'quot':135 'rate':133,157 'render':189 'report':115 'request':60,88,151 'request/response':233 'requir':163 'return':204,244 'schema':232 'scheme':216 'second':228 'sentiment':122 'settl':61 'specif':49,166 'summar':125 'text':124 'timeout':229 'token':134 'uniform':94 'unit':79 'unknown':251 'usdc':15,30,64,81,221 'usdc-settlement' 'use':220 'valid':141,206 'via':10,25,212 'wallet':193 'web3':129 'x402':11,26,40,70,207,214 'x402 API' 'x402-gated':39 'x402-payment'","prices":[{"id":"a66b1cc7-114a-4912-9695-41168ce2308d","listingId":"eef17b13-a068-4656-9b58-54f1c8a01975","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/18","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:49:37.780Z"}],"sources":[{"listingId":"eef17b13-a068-4656-9b58-54f1c8a01975","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/18","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:49:37.780Z","lastSeenAt":"2026-04-23T17:31:47.849Z"}],"details":{"listingId":"eef17b13-a068-4656-9b58-54f1c8a01975","quickStartSnippet":"# Send a POST with x402 payment header (USDC on Base)\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/18 \\\n  -H \"X-PAYMENT: <x402-payment-token>\" \\\n  -H \"Content-Type: application/json\"","exampleRequest":null,"exampleResponse":null,"schema":{"input":{"type":"http","method":"GET","discoverable":true}},"openapiUrl":null,"agentsTxtUrl":null,"citations":[{"claim":"The x402 challenge advertises maxAmountRequired of 20000 base units of USDC on Base network with a 300-second timeout.","source_url":"https://lowpaymentfee.com/api/v1/payments/18"},{"claim":"The provider lists all endpoints at $0.02/request with no API keys, no rate limits, and instant access on Base network.","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset address is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 and payTo is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3.","source_url":"https://lowpaymentfee.com/api/v1/payments/18"}],"useCases":["Accessing premium API data with per-request USDC micropayments on Base","Agent-driven workflows that need keyless, pay-as-you-go API access","Programmatic access to gated endpoints without subscription commitments"],"bestFor":["Developers or agents who want zero-signup, pay-per-call API access","Users already holding USDC on Base who want frictionless micropayments","Exploring x402 protocol integrations with low per-call costs"],"notFor":["Users who need detailed documentation or guaranteed SLAs before paying","Anyone without a Base-compatible wallet and USDC balance","High-volume consumers who need bulk pricing or rate-limit guarantees"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:09.315Z"},"updatedAt":"2026-04-23T17:31:47.849Z"}}