{"uid":"cap_C4sg7KIklJU6teMB8roTI","slug":"onchainexpat-x402-sms-send-964c0fd5","name":"OnchainExpat x402 SMS Send","description":"Pay-per-request AI, crypto, proxy, and utility APIs using x402 protocol","url":"https://x402.onchainexpat.com/api/x402-sms/send","method":"POST","headers":{},"bodySchema":{"type":"object","required":["to","message"],"properties":{"to":{"type":"string","description":"E.164 phone number to send SMS to"},"message":{"type":"string","description":"Message body (SMS character limits apply)"}}},"responseSchema":{"type":"object","properties":{"to":{"type":"string"},"status":{"type":"string"},"message_id":{"type":"string"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"3.5","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.50","reviews":0,"stars":null,"state":"rated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$3.5/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"3.5","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"3.5","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_q0baaMZd7jvaQYii7CckL","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"3.5","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Sends an SMS message to a specified phone number via pay-per-request x402 protocol payment","exampleAgentPrompt":"Send an SMS to +14155552671 with the message: 'Your order has been shipped and will arrive tomorrow.'","exampleUseCases":null,"resultDescription":"Returns a JSON object with the recipient phone number, delivery status string, and a unique message ID for tracking.","failureModes":["Invalid or non-E.164 formatted phone number returns an error","Message body exceeds SMS character limits causes rejection","Insufficient x402 payment (not enough USDC) results in 402 Payment Required","Carrier rejection or undeliverable number returns a failed status","Network or upstream SMS provider outage causes delivery failure"],"whenToPreferThis":"Choose this endpoint when you need to send a single SMS message programmatically without committing to a monthly SMS subscription service, paying only $3.50 USDC per message via the x402 micropayment protocol. It is ideal for AI agents, bots, or automated workflows that send infrequent or on-demand notifications and want crypto-native billing.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":2,"lastUsedAt":"2026-07-11T20:20:01.371Z","lastSuccessfullyRanAt":"2026-07-11T20:20:01.371Z","lastHealthCheckAt":"2026-09-13T12:49:23.236Z","isFirstParty":false}