{"id":"317a67bd-74c2-48b5-b317-a3132add67f5","shortId":"pWGspV","kind":"x402","title":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","tagline":"Pay-per-call email data endpoint on Base via x402, settled in USDC at $0.02/request.","description":"This endpoint at `/api/v1/emails/29` is part of the lowpaymentfee.com platform, which offers a collection of pay-per-request APIs spanning data & analytics, AI/ML, finance, and infrastructure categories. The specific endpoint probed here is labeled \"Premium API Access\" and accepts POST requests, returning JSON. Payment is handled via the x402 protocol on the Base network using USDC (contract `0x8335...2913`), with a maximum charge of 20,000 base units — equivalent to $0.02 per request (USDC uses 6 decimals).\n\nThe broader platform advertises a uniform $0.02/request pricing model across all endpoints, with no API keys, no rate limits, no minimums, and instant access. However, the specific functionality of the `/api/v1/emails/29` endpoint is unclear — the path suggests it retrieves or processes email-related data for a resource identified as ID 29, but no documentation, request schema, or response schema is available. The docs, pricing, API, and README pages all returned only a \"Connect wallet\" prompt with no substantive content.\n\nBecause there is no OpenAPI spec, no request/response examples, and no documentation describing what this endpoint actually does or what input it expects, agents should treat this as a low-documentation endpoint. The x402 challenge is live and well-formed, confirming the endpoint is operational and ready to accept payments.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","pay-per-request","json-response","email-data"],"categories":["data","email"],"synonyms":["email API","premium email access","pay-per-call email","x402 email endpoint","lowpaymentfee email","USDC email API","Base network API"],"warnings":["No documentation available — all doc pages return only 'Connect wallet' with no content","No request or response schema provided; unclear what input the POST endpoint expects","The specific functionality of /api/v1/emails/29 is unknown — 'Premium API Access' is a generic label","No OpenAPI spec or AI plugin manifest found"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/29","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/emails/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}]},"qualityScore":"0.300","qualityRationale":"The x402 challenge is live and well-formed, confirming the endpoint is operational with clear pricing ($0.02 USDC on Base). However, there is no documentation, no OpenAPI spec, no request/response schema, and no explanation of what the endpoint actually returns. The docs pages are all empty 'Connect wallet' stubs. This is effectively a stub 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'/request':17,34,120 '0.02':16,33,106,119 '000':101 '0x8335':93 '20':100 '29':165 '2913':94 '6':111 'Base network API' 'USDC email API' 'accept':74,244 'access':72,137 'across':123 'actual':210 'advertis':116 'agent':217 'ai/ml':58 'analyt':57 'api':54,71,128,179 'avail':175 'base':9,26,88,102 'base-network' 'broader':114 'call':4,21 'categori':62 'challeng':229 'charg':98 'collect':48 'confirm':236 'connect':187 'content':193 'contract':92 'data':6,23,56,158 'decim':112 'describ':206 'doc':177 'document':168,205,225 'email':5,22,156 'email API' 'email-data' 'email-rel':155 'endpoint':7,24,36,65,125,145,209,226,238 'equival':104 'exampl':202 'expect':216 'financ':59 'form':235 'function':141 'handl':81 'howev':138 'id':164 'identifi':162 'infrastructur':61 'input':214 'instant':136 'json':78 'json-response' 'key':129 'label':69 'limit':132 'live':231 'low':224 'low-document':223 'lowpaymentfee email' 'lowpaymentfee.com':43 'maximum':97 'minimum':134 'model':122 'network':89 'offer':46 'openapi':198 'oper':240 'page':182 'part':40 'path':149 'pay':2,19,51 'pay-per-cal':1,18 'pay-per-call email' 'pay-per-request':50 'payment':79,245 'per':3,20,52,107 'platform':44,115 'post':75 'premium':70 'premium email access' 'price':121,178 'probe':66 'process':154 'prompt':189 'protocol':85 'rate':131 'readi':242 'readm':181 'relat':157 'request':53,76,108,169 'request/response':201 'resourc':161 'respons':172 'retriev':152 'return':77,184 'schema':170,173 'settl':12,29 'span':55 'spec':199 'specif':64,140 'substant':192 'suggest':150 'treat':219 'unclear':147 'uniform':118 'unit':103 'usdc':14,31,91,109 'usdc-settlement' 'use':90,110 'via':10,27,82 'wallet':188 'well':234 'well-form':233 'x402':11,28,84,228 'x402 email endpoint' 'x402-payment'","prices":[{"id":"80e5e6f3-caa4-468b-a53d-4fed6b1b7c46","listingId":"317a67bd-74c2-48b5-b317-a3132add67f5","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/emails/29","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.913Z"}],"sources":[{"listingId":"317a67bd-74c2-48b5-b317-a3132add67f5","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/29","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.913Z","lastSeenAt":"2026-04-22T10:32:39.094Z"}],"details":{"listingId":"317a67bd-74c2-48b5-b317-a3132add67f5","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/29 \\\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 network","source_url":"https://lowpaymentfee.com/api/v1/emails/29"},{"claim":"Platform pricing is $0.02/request with no API keys, no rate limits, no minimums","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/29"}],"useCases":["Retrieving email-related data on a per-request payment basis","Programmatic access to email records without API key management","Agent-driven email data lookups settled in USDC on Base"],"bestFor":["Agents needing keyless, pay-per-call email data access","Developers who want to avoid subscription commitments for occasional email lookups","x402-compatible clients on the Base network"],"notFor":["Users needing well-documented APIs with clear request/response schemas","High-volume email processing where per-request pricing is inefficient","Anyone requiring non-crypto payment methods"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:21.604Z"},"updatedAt":"2026-04-22T10:32:39.094Z"}}