{"id":"fe73c312-315c-47a0-ae1e-2f204248b747","shortId":"7MQPZL","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 lowpaymentfee.com provides premium API access to an email-related resource (ID 54) via the x402 payment protocol. It accepts POST requests and returns JSON. Payment is settled on the Base network using USDC (contract 0x8335…2913) at a cost of $0.02 per request (20,000 base units with 6 decimals). No API keys or rate limits are required — callers simply attach an X-PAYMENT header with a valid x402 payment proof.\n\nThe endpoint is part of a broader platform (lowpaymentfee.com) that offers dozens of pay-per-call APIs spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities — all priced uniformly at $0.02 per request. However, the specific endpoint probed (/api/v1/emails/54) is not listed on the site's public catalog, so its exact functionality is unclear. The path suggests it returns data about or related to a specific email record (ID 54), but no schema, documentation, or example responses are available to confirm what fields are returned.\n\nThe endpoint is live and responds with a well-formed x402 challenge (HTTP 402). The payment timeout is 300 seconds. The platform advertises no minimums, no commitments, and instant access. Documentation pages (/docs, /pricing, /README) all returned only a \"Connect wallet\" prompt with no substantive content during the crawl.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-data","pay-per-call","no-api-key","json-response"],"categories":["data","email"],"synonyms":["email API","email lookup","email data endpoint","x402 email","pay-per-request email","lowpaymentfee email","USDC email API","Base network API"],"warnings":["The /api/v1/emails/54 endpoint is not listed in the provider's public API catalog — its purpose and output are unknown.","All documentation pages (/docs, /pricing, /README) returned no useful content during crawl.","No request body schema or response schema is available; callers cannot know what to send or what to expect back.","The endpoint path suggests a single fixed resource (ID 54) rather than a parameterized query, which limits utility."],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/54","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/54","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, but there is no documentation, no request/response schema, and the specific /emails/54 path is not listed on the provider's own catalog. It is impossible to determine what this endpoint actually returns without paying for a call. Docs pages are 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'/docs':231 '/pricing':232 '/readme':233 '/request':17,34 '0.02':16,33,79,143 '000':83 '0x8335':73 '20':82 '2913':74 '300':217 '402':212 '54':50,182 '6':87 'Base network API' 'USDC email API' 'accept':57 'access':42,228 'advertis':221 'ai/ml':132 'analyt':131 'api':41,90,128 'attach':99 'avail':191 'base':9,26,68,84 'base-network' 'broader':117 'call':4,21,127 'caller':97 'catalog':160 'challeng':210 'commit':225 'confirm':193 'connect':238 'content':244 'contract':72 'cost':77 'crawl':247 'data':6,23,130,135,172 'decim':88 'document':186,229 'dozen':122 'email':5,22,46,179 'email API' 'email data endpoint' 'email lookup' 'email-data' 'email-rel':45 'endpoint':7,24,36,112,149,199 'exact':163 'exampl':188 'field':195 'finance/web3':134 'form':208 'function':164 'header':104 'howev':146 'http':211 'id':49,181 'infer':133 'infrastructur':137 'instant':227 'json':62 'json-response' 'key':91 'limit':94 'list':154 'live':201 'lowpaymentfee email' 'lowpaymentfee.com':38,119 'minimum':223 'network':69 'no-api-key' 'offer':121 'page':230 'part':114 'path':168 'pay':2,19,125 'pay-per-cal':1,18,124 'pay-per-call' 'pay-per-request email' 'payment':54,63,103,109,214 'per':3,20,80,126,144 'platform':118,220 'post':58 'premium':40 'price':140 'probe':150 'prompt':240 'proof':110 'protocol':55 'provid':39 'public':159 'rate':93 'record':180 'relat':47,175 'request':59,81,145 'requir':96 'resourc':48 'respond':203 'respons':189 'return':61,171,197,235 'schema':185 'second':218 'settl':12,29,65 'simpli':98 'site':157 'span':129 'specif':148,178 'substant':243 'suggest':169 'timeout':215 'unclear':166 'uniform':141 'unit':85 'usdc':14,31,71 'usdc-settlement' 'use':70 'util':138 'valid':107 'via':10,27,51 'wallet':239 'well':207 'well-form':206 'x':102 'x-payment':101 'x402':11,28,53,108,209 'x402 email' 'x402-payment'","prices":[{"id":"f4519713-0c09-4616-ac8f-98e19d408ef1","listingId":"fe73c312-315c-47a0-ae1e-2f204248b747","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/54","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:12.392Z"}],"sources":[{"listingId":"fe73c312-315c-47a0-ae1e-2f204248b747","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/54","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:12.392Z","lastSeenAt":"2026-04-22T07:01:53.733Z"}],"details":{"listingId":"fe73c312-315c-47a0-ae1e-2f204248b747","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/54 \\\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 HTTP 402 with an x402 challenge requiring USDC payment on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/54"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/emails/54"},{"claim":"The platform advertises $0.02/request, no API keys, no rate limits, instant access, Base network","source_url":"https://lowpaymentfee.com"},{"claim":"USDC asset contract is 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base","source_url":"https://lowpaymentfee.com/api/v1/emails/54"}],"useCases":["Retrieving email-related data for a specific record via a single paid API call","Integrating pay-per-use email data into agent workflows without managing API keys","Programmatic access to email metadata settled on-chain via USDC on Base"],"bestFor":["Agents or bots that need on-demand email data without subscription overhead","Developers experimenting with x402 pay-per-call protocols","Workflows requiring keyless, permissionless API access"],"notFor":["Bulk email sending or transactional email delivery","Users who need detailed documentation or guaranteed SLAs before integrating","High-volume use cases where per-call pricing may add up"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:20.757Z"},"updatedAt":"2026-04-22T07:01:53.733Z"}}