{"uid":"cap_8tZGhKyAl5gQwMLNA9Sgb","slug":"bismuth-email-8e393d7f","name":"Bismuth Email","description":"Transactional email via Resend with CC/BCC and base64 file attachments. Part of the Bismuth utility API suite for AI agents.","url":"https://x402-email-api-production.up.railway.app/send","method":"POST","headers":{},"bodySchema":{"type":"object","required":["to","body","subject"],"properties":{"cc":{"type":"string","description":"Carbon copy recipients"},"to":{"type":"string","description":"Recipient email address"},"bcc":{"type":"string","description":"Blind carbon copy recipients"},"body":{"type":"string","description":"Email body — HTML or plain text (max 100 KB)"},"subject":{"type":"string","description":"Email subject (max 998 chars per RFC 5321)"},"reply_to":{"type":"string","description":"Optional reply-to address"},"attachments":{"type":"string","description":"Base64-encoded file attachments (25MB pre-encoding cap per file)"}}},"responseSchema":{},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_mHwSHhJUi5YVVUqppCaw9","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Sends transactional emails via Resend with support for CC/BCC recipients and base64-encoded file attachments","exampleAgentPrompt":"Send an email to alice@example.com with subject 'Your Invoice #1042' and an HTML body showing the invoice summary, CC bob@example.com, and attach the PDF invoice encoded as base64.","exampleUseCases":[{"title":"Automated invoice delivery workflow","prompt":"Send an email to the customer at their address with their monthly invoice as a PDF attachment and CC their accounting department so everyone stays in sync."},{"title":"User notification with report file","prompt":"Email the team lead at their work email with this month's performance report as an HTML attachment, and make sure to BCC the HR department for record-keeping."},{"title":"Order confirmation to multiple parties","prompt":"Send order confirmation emails to the customer and vendor with the order details in HTML format, attach the purchase agreement as a base64-encoded PDF, and CC the finance team on both."}],"resultDescription":"A confirmation response indicating whether the email was successfully dispatched via Resend. The response body is minimal — success or failure signal.","failureModes":["Missing required fields (to, subject, or body) returns a validation error","Invalid email address format causes delivery failure","Attachment exceeds 25MB pre-encoding cap per file","Email body exceeds 100KB limit","Invalid base64 encoding for attachments causes rejection","Payment not included or insufficient USDC causes x402 payment-required error"],"whenToPreferThis":"Choose this endpoint when an AI agent needs to send transactional or notification emails programmatically with optional attachments (base64 files up to 25MB), CC/BCC, and HTML support — especially in x402 micropayment-enabled workflows. Prefer over SMTP or other email APIs when operating within the Bismuth/x402 agent payment ecosystem and you need a simple per-call pricing model at $0.01 USDC.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":1,"lastUsedAt":"2026-07-28T22:13:57.267Z","lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T00:30:05.443Z","isFirstParty":false}