{"id":"ccdca683-beb0-4290-a54e-31fd98081fd2","shortId":"XR647B","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 probed endpoint (/api/v1/payments/254) is live and returns a 402 challenge requesting payment in USDC on the Base network. The site advertises a broad catalog of API endpoints spanning data & analytics, AI & machine learning, finance & Web3, and infrastructure utilities — all priced at $0.02 per request.\n\nThe x402 challenge for this specific endpoint shows a maxAmountRequired of 20000 base units of USDC (0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base, 6 decimals), which equals $0.02. Payment is made via the x402 exact scheme with no API keys, no rate limits, and no upfront commitments required. The payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 with a 300-second timeout.\n\nHowever, the specific functionality behind this particular endpoint (/api/v1/payments/254) is unclear — the description is simply \"Premium API Access\" with no further documentation on what data or service it returns. The docs, pricing, and API pages on the site all render only a \"Connect wallet\" prompt with no additional content. There is no OpenAPI spec, no request/response schema documentation, and no examples available. The site lists many other endpoints (sentiment analysis, summarization, geocoding, etc.) but none of them were probed, and it is unknown whether /api/v1/payments/254 maps to one of those or is a separate resource.","tags":[],"capabilities":["x402-payment","usdc-base","pay-per-request","no-api-key","json-response"],"categories":["api-marketplace","payments"],"synonyms":["x402 API","pay-per-call API","USDC micropayment API","Base network API","lowpaymentfee","premium API access","crypto-paid API"],"warnings":["No documentation available — docs, pricing, and API pages only show 'Connect wallet'","No OpenAPI or schema describing request parameters or response format","The specific functionality of /api/v1/payments/254 is undocumented and unclear","No example requests or responses available anywhere in crawled content","The site lists many endpoints but it is unknown if this endpoint maps to any of them"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/254","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/254","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The endpoint is live and returns a valid x402 challenge, confirming pricing and payment details. However, there is no documentation on what the endpoint actually does, no OpenAPI spec, no request/response schemas, and no examples. The docs pages are empty (wallet-connect only). The specific purpose of /api/v1/payments/254 is 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'/request':13,28 '0.02':12,27,86,112 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':137 '0x833589fcd6edb6e08f4c7c32d4f71b54bda02913':105 '20000':100 '300':140 '402':53 '6':108 'Base network API' 'USDC micropayment API' 'access':7,22,38,160 'addit':190 'address':135 'advertis':65 'ai':75 'analysi':212 'analyt':74 'api':6,21,37,70,123,159,176 'avail':204 'base':9,24,61,101,107 'behind':147 'broad':67 'call':4,19 'catalog':68 'challeng':54,91 'commit':131 'connect':185 'content':191 'crypto-paid API' 'data':73,167 'decim':109 'descript':155 'doc':173 'document':164,200 'endpoint':32,46,71,95,150,210 'equal':111 'etc':215 'exact':119 'exampl':203 'financ':78 'function':146 'geocod':214 'howev':143 'infrastructur':81 'json-response' 'key':124 'learn':77 'limit':127 'list':207 'live':49 'lowpaymentfee' 'lowpaymentfee.com':34 'machin':76 'made':115 'mani':208 'map':228 'maxamountrequir':98 'network':62 'no-api-key' 'none':217 'one':230 'openapi':195 'page':177 'particular':149 'pay':2,17 'pay-per-cal':1,16 'pay-per-call API' 'pay-per-request' 'payment':42,56,113,134 'per':3,18,87 'premium':5,20,36,158 'premium API access' 'price':84,174 'probe':45,221 'prompt':187 'protocol':43 'provid':35 'rate':126 'render':182 'request':55,88 'request/response':198 'requir':132 'resourc':237 'return':51,171 'schema':199 'scheme':120 'second':141 'sentiment':211 'separ':236 'servic':169 'show':96 'simpli':157 'site':64,180,206 'span':72 'spec':196 'specif':94,145 'summar':213 'timeout':142 'unclear':153 'unit':102 'unknown':225 'upfront':130 'usdc':15,30,58,104 'usdc-base' 'util':82 'via':10,25,39,116 'wallet':186 'web3':79 'whether':226 'x402':11,26,41,90,118 'x402 API' 'x402-payment'","prices":[{"id":"176894fe-1a70-49d6-8e45-1b7a59d6281e","listingId":"ccdca683-beb0-4290-a54e-31fd98081fd2","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/254","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:08.817Z"}],"sources":[{"listingId":"ccdca683-beb0-4290-a54e-31fd98081fd2","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/254","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:08.817Z","lastSeenAt":"2026-04-22T23:01:43.183Z"}],"details":{"listingId":"ccdca683-beb0-4290-a54e-31fd98081fd2","quickStartSnippet":"# 1. Send a POST to discover the x402 payment challenge:\ncurl -X POST https://lowpaymentfee.com/api/v1/payments/254\n# Returns 402 with x402 challenge header.\n# 2. Construct and attach X-PAYMENT header with signed USDC payment on Base.\n# 3. Re-send the POST with the payment header to receive the response.","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 of USDC on Base","source_url":"https://lowpaymentfee.com/api/v1/payments/254"},{"claim":"All listed APIs are priced at $0.02 per request with no API keys, no rate limits, and instant access","source_url":"https://lowpaymentfee.com"},{"claim":"The site offers endpoints across Data & Analytics, AI & ML, Finance & Web3, and Infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"USDC contract on Base is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/254"}],"useCases":["Accessing paid API endpoints without API key registration","Making one-off API calls with per-request USDC micropayments on Base","Agent-driven programmatic access to paid services via x402 protocol"],"bestFor":["Developers wanting zero-signup pay-per-use API access","AI agents that can settle x402 payments autonomously","Users already holding USDC on Base who want frictionless API calls"],"notFor":["Users needing detailed API documentation or schemas before purchasing","Anyone without USDC on the Base network","High-volume use cases where per-request payment overhead is undesirable"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.879Z"},"updatedAt":"2026-04-22T23:01:43.183Z"}}