{"uid":"cap_CIdfv4ihpHLycp7x9BKgJ","slug":"fastsend-sms-email-messaging-api-414328f3","name":"Fastsend SMS & Email Messaging API","description":"Send an SMS or email message via Fastsend.","url":"https://fastsend.dev/api/v2/messages?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"to":{"type":"string"},"from":{"type":"string"},"channel":{"enum":["sms","email"],"type":"string"},"content":{"type":"string"},"subject":{"type":"string"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.165","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":"$0.165/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.165","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.165","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_57VjmiyhoWGEO36wQONtt","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.165","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Send an SMS or email message to a specified recipient via Fastsend's messaging platform.","exampleAgentPrompt":"Send an SMS to +14155552671 from +14155550100 saying 'Your order has shipped and will arrive tomorrow!'","exampleUseCases":[{"title":"Order shipment SMS notification","prompt":"Text my customer at +14155552671 from +18005550100 via SMS to let them know: 'Your package has shipped and is on its way — expected delivery is tomorrow by 5pm.'"},{"title":"Password reset email alert","prompt":"Send an email to user@example.com from no-reply@myapp.com with subject 'Reset Your Password' and body 'Click here to reset your password: https://myapp.com/reset?token=abc123'"},{"title":"Appointment reminder text message","prompt":"Send an SMS from +18005550199 to +13105559876 reminding them: 'Hi Sarah, this is a reminder that your dental appointment is tomorrow at 2pm. Reply STOP to unsubscribe.'"}],"resultDescription":"A confirmation response indicating whether the message was successfully dispatched, typically including delivery status and message metadata such as message ID.","failureModes":["Invalid or unformatted phone number or email address returns a validation error","Missing required fields (to, from, channel, content) result in a 400 bad request","Unsupported channel value (not 'sms' or 'email') causes rejection","Payment not completed (x402 protocol) blocks the request","Rate limiting or quota exceeded returns a 429 error","Delivery failure to the recipient's carrier or email provider may result in a non-delivery report"],"whenToPreferThis":"Choose this endpoint when you need a simple, pay-per-use API to programmatically send either SMS or email messages without managing your own carrier integrations or email infrastructure. It is ideal for agentic workflows that need to notify, alert, or reach users on-demand, especially when cost predictability ($0.165 per message) and dual-channel support (SMS + email) in a single API call matters.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-03T00:34:31.278Z","isFirstParty":false,"canonicalSlug":"fastsend-sms-email-messaging-api-262c1939"}