{"id":"3c6eec57-26b0-41e9-9e53-10767c796786","shortId":"StSMDC","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 site hosts a broad catalog of pay-per-request APIs spanning data & analytics, AI/ML (sentiment analysis, summarization, classification, embeddings), finance & Web3 (price feeds, exchange rates, token quotes, gas estimates), and infrastructure utilities (geocoding, validation, conversion, generation). All endpoints 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 specific endpoint `/api/v1/payments/269` is labeled \"Premium API Access\" and returns a standard x402 challenge with `maxAmountRequired` of 20,000 base units of USDC (0.02 USD, since USDC uses 6 decimals). Payment is settled on-chain to address `0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3` using the \"exact\" scheme. The endpoint accepts POST requests and returns `application/json`.\n\nNote that while the site advertises many different API categories, the crawled documentation pages (docs, pricing, README) all returned only a \"Connect wallet\" prompt with no further technical documentation, schemas, or example payloads. It is unclear what specific data or functionality the `/api/v1/payments/269` endpoint returns, as no request/response schemas or examples are documented. The endpoint is live and responds with a valid 402 challenge, but the lack of documentation makes it difficult to determine what you actually get after paying.","tags":[],"capabilities":["x402-payment","usdc-base-network","pay-per-request","no-api-key","json-response","post-method"],"categories":["api-gateway","payments"],"synonyms":["x402 api","pay per call api","usdc api access","base network api","micropayment api","lowpaymentfee","premium api"],"warnings":["No API documentation available — docs, pricing, and README pages all show only 'Connect wallet'","No request or response schema provided; unclear what data is returned after payment","The endpoint path '/api/v1/payments/269' does not match any of the advertised API categories on the homepage, so its actual function is unknown","Cannot verify what service is delivered after payment"],"endpointUrl":"https://lowpaymentfee.com/api/v1/payments/269","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/269","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 402 challenge, confirming pricing and payment details. However, there is no documentation, no request/response schema, and no examples — the docs, pricing, and README pages all render only 'Connect wallet'. It is unclear what the endpoint actually returns after payment, making this effectively a stub 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'/request':13,28 '0.02':12,27,87,130 '000':125 '0x1a2b13e97f5f837c8f9fa1f95a1484b7c70d85f3':145 '20':124 '402':220 '6':135 'accept':152 'access':7,22,38,114 'actual':234 'address':144 'advertis':163 'ai/ml':59 'analysi':61 'analyt':58 'api':6,21,37,55,99,113,166 'application/json':157 'base':9,24,95,126 'base network api' 'broad':48 'call':4,19 'catalog':49 'categori':167 'chain':142 'challeng':120,221 'classif':63 'commit':104 'connect':179 'convers':80 'crawl':169 'data':57,196 'decim':136 'determin':231 'differ':165 'difficult':229 'doc':172 'document':170,186,210,226 'embed':64 'endpoint':32,83,108,151,201,212 'estim':74 'exact':148 'exampl':189,208 'exchang':69 'feed':68 'financ':65 'function':198 'gas':73 'generat':81 'geocod':78 'get':235 'host':46 'infrastructur':76 'json-response' 'key':100 'label':111 'lack':224 'limit':102 'live':214 'lowpaymentfee' 'lowpaymentfee.com':34 'make':227 'mani':164 'maxamountrequir':122 'micropayment api' 'network':96 'no-api-key' 'note':158 'on-chain':140 'page':171 'pay':2,17,52,237 'pay per call api' 'pay-per-cal':1,16 'pay-per-request':51 'payabl':90 'payload':190 'payment':42,137 'per':3,18,53,88 'post':153 'post-method' 'premium':5,20,36,112 'premium api' 'price':67,85,173 'prompt':181 'protocol':43 'provid':35 'quot':72 'rate':70,101 'readm':174 'request':54,89,154 'request/response':205 'requir':105 'respond':216 'return':116,156,176,202 'schema':187,206 'scheme':149 'sentiment':60 'settl':139 'sinc':132 'site':45,162 'span':56 'specif':107,195 'standard':118 'summar':62 'technic':185 'token':71 'unclear':193 'unit':127 'usd':131 'usdc':15,30,92,129,133 'usdc api access' 'usdc-base-network' 'use':134,146 'util':77 'valid':79,219 'via':10,25,39 'wallet':180 'web3':66 'x402':11,26,41,119 'x402 api' 'x402-payment'","prices":[{"id":"3b51ad5d-b610-4d88-8dd2-cb177d10c7d8","listingId":"3c6eec57-26b0-41e9-9e53-10767c796786","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/269","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-18T18:50:08.798Z"}],"sources":[{"listingId":"3c6eec57-26b0-41e9-9e53-10767c796786","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/payments/269","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-18T18:50:08.798Z","lastSeenAt":"2026-04-23T14:01:24.367Z"}],"details":{"listingId":"3c6eec57-26b0-41e9-9e53-10767c796786","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/payments/269 \\\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":"All endpoints priced at $0.02 per request with no API keys, rate limits, or commitments","source_url":"https://lowpaymentfee.com"},{"claim":"Site advertises APIs across data & analytics, AI/ML, finance & Web3, and infrastructure categories","source_url":"https://lowpaymentfee.com"},{"claim":"Endpoint returns x402 challenge with maxAmountRequired of 20000 base units USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/payments/269"},{"claim":"Payment address is 0x1A2B13E97f5F837C8F9FA1F95a1484B7C70d85F3 and asset is USDC at 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","source_url":"https://lowpaymentfee.com/api/v1/payments/269"}],"useCases":["Programmatic pay-per-call access to APIs without needing API keys or subscriptions","Agent-driven workflows that need on-demand API access settled in USDC on Base","Testing x402 payment protocol integrations with a low-cost endpoint"],"bestFor":["Developers exploring x402 payment protocol","Agents needing keyless, pay-as-you-go API access","Low-cost per-request API consumption on Base L2"],"notFor":["Users who need detailed API documentation or guaranteed SLAs before paying","High-volume use cases where per-request pricing may add up","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:14:07.88Z"},"updatedAt":"2026-04-23T14:01:24.367Z"}}