send_sms
Reach a human via SMS when your task requires real-world coordination. Send to any phone number worldwide — delivery timing varies by destination. No phone plan, no SIM card, no telecom account needed. Pay with Bitcoin Lightning — no API key, no KYC, no subscription. Requires create_payment with toolName='send_sms' and phoneNumber+message at payment time. The phoneNumber must match the one used in create_payment. The message must not need more SMS segments than were paid for. Free rules, refused before payment, with no invoice: no links in the text, a send limit per destination number, and no number on our do-not-contact list. A paid send checks the limit and the list again; a refusal then refunds in full. A link added after payment is held, not refunded: a link is never sent. A US number: Queued. A text to a US number can take a few hours to arrive. Each SMS ends with a short signature line naming the service and a safety/stop link, within the paid segment count. No impersonation, scams, threats, harassment, credential theft, unsolicited bulk messages, or contact after an opt-out. Answering a call does not establish consent. We screen requests after payment. Held messages and calls are not sent or placed; payment is retained during review, not refunded immediately. Confirmed violations are not refunded. Unresolved communication holds become eligible for a refund after 24 hours; refund eligibility is processed by scheduled maintenance. Human review costs 1 sat at https://sats4ai.com/appeal. Recent message text and extracts of recording transcripts support recipient-scoped abuse checks for 24 hours. These context records are deleted hourly, so storage can last up to 25 hours. Original uploaded-call transcripts and raw held-request or appeal evidence enter cleanup after 30 days. We also keep a de-identified record of screened communications to measure and improve fraud detection. Identifiers in it — contact addresses, numbers and names that follow a greeting — are replaced with one-way tokens, and it holds no destination number and no account, because the service has none. De-identification is not anonymization: text a sender wrote can still identify someone. Do not submit personal information the service does not need. Providers keep records under their own policies.
Input Schema
| Name | Required | Description | Default |
|---|---|---|---|
| message | Yes | Message text (max 1544 chars — a short signature line is appended; billed per SMS segment) | |
| paymentId | Yes | Valid payment ID (must be paid) | |
| phoneNumber | Yes | Phone number in E.164 format (e.g., +14155550100). NOTE: non-+1 (international) numbers are delivered from an alphanumeric sender ID, so the recipient CANNOT reply — one-way only; for some countries (e.g. FR/CZ/CN) it is the only delivery path. No error is returned. |