{"id":"96f075d5-f813-404d-a553-19f6fe6fa7b0","shortId":"wBxp7n","kind":"x402","title":"Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required.","tagline":"Pay-per-request email API on Base via x402 — $0.02/call in USDC, no API keys required.","description":"This endpoint at lowpaymentfee.com provides a pay-per-request email-related API accessible via the x402 payment protocol. The specific resource path `/api/v1/emails/15` suggests retrieval or interaction with a particular email record (ID 15). 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, subscriptions, or rate limits are advertised — callers simply attach an x402 payment header to each POST request.\n\nThe provider, lowpaymentfee.com, hosts a broader catalog of x402-gated endpoints spanning data analytics, AI/ML inference, finance/Web3 data, and infrastructure utilities, all priced uniformly at $0.02 per call. Documentation beyond the landing page is extremely thin — the /docs, /pricing, /api, and /README pages all render only a \"Connect wallet\" prompt with no further technical detail. There is no OpenAPI spec, no request/response schema documentation, and no example payloads available. The endpoint is confirmed live (returns a proper 402 challenge), but the lack of documentation makes it difficult to know what request body to send or what response shape to expect.","tags":[],"capabilities":["x402-payment","usdc-settlement","base-network","email-api","pay-per-request","no-api-key","post-method"],"categories":["email","data"],"synonyms":["email endpoint","x402 email API","pay-per-call email","USDC email API","Base network API","lowpaymentfee email","micropayment email"],"warnings":["No OpenAPI or schema documentation available — request and response formats are unknown","All documentation pages (/docs, /pricing, /api, /README) render only 'Connect wallet' with no technical content","The specific function of /api/v1/emails/15 is unclear — it could be email retrieval, sending, or something else","The provider lists many endpoint categories but none are documented beyond titles and prices"],"endpointUrl":"https://lowpaymentfee.com/api/v1/emails/15","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/15","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 402 challenge, confirming it accepts payments. However, there is no OpenAPI spec, no request/response schema, no documentation beyond a landing page, and the specific purpose of /api/v1/emails/15 is unclear. This is effectively a stub 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'/api/v1/emails/15':61 '/call':12,30 '/docs':157 '/pricing':158 '/readme':161 '0.02':11,29,89,145 '000':93 '0x8335':83 '15':72 '20':92 '2913':84 '402':197 '6':97 'Base network API' 'USDC email API' 'access':51 'advertis':107 'ai/ml':134 'analyt':133 'api':6,16,24,34,50,100 'attach':110 'avail':188 'base':8,26,78,94 'base-network' 'beyond':149 'bodi':211 'broader':124 'call':147 'caller':108 'catalog':125 'challeng':198 'confirm':192 'connect':167 'contract':82 'cost':87 'data':132,137 'decim':98 'detail':174 'difficult':206 'document':148,183,203 'email':5,23,48,69 'email endpoint' 'email-api' 'email-rel':47 'endpoint':38,130,190 'exampl':186 'expect':219 'extrem':154 'finance/web3':136 'gate':129 'header':114 'host':122 'id':71 'infer':135 'infrastructur':139 'interact':65 'key':17,35,101 'know':208 'lack':201 'land':151 'limit':105 'live':193 'lowpaymentfee email' 'lowpaymentfee.com':40,121 'make':204 'micropayment email' 'network':79 'no-api-key' 'openapi':178 'page':152,162 'particular':68 'path':60 'pay':2,20,44 'pay-per-call email' 'pay-per-request':1,19,43 'payload':187 'payment':55,73,113 'per':3,21,45,90,146 'post':117 'post-method' 'price':142 'prompt':169 'proper':196 'protocol':56 'provid':41,120 'rate':104 'record':70 'relat':49 'render':164 'request':4,22,46,91,118,210 'request/response':181 'requir':18,36 'resourc':59 'respons':216 'retriev':63 'return':194 'schema':182 'send':213 'settl':75 'shape':217 'simpli':109 'span':131 'spec':179 'specif':58 'subscript':102 'suggest':62 'technic':173 'thin':155 'uniform':143 'unit':95 'usdc':14,32,81 'usdc-settlement' 'use':80 'util':140 'via':9,27,52 'wallet':168 'x402':10,28,54,112,128 'x402 email API' 'x402-gated':127 'x402-payment'","prices":[{"id":"1756f958-312b-4c0d-8e3f-94710e45e3cc","listingId":"96f075d5-f813-404d-a553-19f6fe6fa7b0","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/15","description":"Premium API Access","outputSchema":{"input":{"type":"http","method":"GET","discoverable":true}},"maxAmountRequired":"20000","maxTimeoutSeconds":300}],"asset_contract":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","max_timeout_seconds":300},"createdAt":"2026-04-21T18:32:10.405Z"}],"sources":[{"listingId":"96f075d5-f813-404d-a553-19f6fe6fa7b0","source":"x402_bazaar","sourceId":"https://lowpaymentfee.com/api/v1/emails/15","sourceUrl":"https://api.cdp.coinbase.com/platform/v2/x402/discovery/resources","isPrimary":true,"firstSeenAt":"2026-04-21T18:32:10.405Z","lastSeenAt":"2026-04-22T13:32:08.984Z"}],"details":{"listingId":"96f075d5-f813-404d-a553-19f6fe6fa7b0","quickStartSnippet":"curl -X POST https://lowpaymentfee.com/api/v1/emails/15 \\\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":"Endpoint returns a valid x402 402 challenge with USDC on Base network","source_url":"https://lowpaymentfee.com/api/v1/emails/15"},{"claim":"maxAmountRequired is 20000 base units of USDC (6 decimals) = $0.02","source_url":"https://lowpaymentfee.com/api/v1/emails/15"},{"claim":"Provider advertises $0.02/request, no API keys, no rate limits, instant access on Base network","source_url":"https://lowpaymentfee.com"},{"claim":"Documentation pages render only 'Connect wallet' with no further content","source_url":"https://lowpaymentfee.com/docs"}],"useCases":["Fetching or interacting with email data on a per-request payment basis","Agent-driven email retrieval without needing pre-provisioned API keys","Programmatic access to email records settled via on-chain USDC micropayments"],"bestFor":["AI agents that need keyless, pay-as-you-go email data access","Developers experimenting with x402 payment-gated APIs","Use cases requiring low-friction, no-subscription API access on Base"],"notFor":["High-volume email operations where per-request pricing becomes expensive","Users who need detailed API documentation or guaranteed SLAs before integrating","Anyone without a Base-compatible USDC wallet"],"kindDetails":{"x402_version":1,"resource_type":"http","bazaar_last_updated":"2026-02-17T23:13:22.297Z"},"updatedAt":"2026-04-22T13:32:08.984Z"}}