Get Listed

Best pay-per-call APIs to send sms text message for AI agents (September 2026)

Ranked by evidence from Zero's own probes and real agent calls · Updated Sep 29, 2026 · 26 agents searched Zero for this in the last 90 days

Zero indexes 5 pay-per-call services that send sms text message. Of the 5 ranked here, 5 answered a live probe in the last 7 days. Quoted prices run from $0.02 to $3.50 per call, median $0.03, paid per call over x402 or MPP with no API key. The one with real agent usage in the last 30 days is Spraay SMS Payment Notification. The cheapest live option is Spraay SMS Payment Notification at $0.02.

  1. gateway.spraay.appSpraay SMS Payment Notification2.3(3)39x402

    Sends an SMS message to a specified phone number, typically used for payment alerts and transaction notifications.

    $0.02/message

    Live · checked Sep 30, 20263 calls · 30 days

  2. api.paysponge.comPaySponge Textbelt SMS Sendmessaging1.2(3)9x402

    Send an SMS message to any phone number via a Textbelt-backed wrapper, billed per-message through x402 crypto payments

    $0.02/message

    Live · checked Sep 30, 20260 calls · 30 days

  3. ai.verifik.coVerifik AI SMS Communication2x402

    Sends an SMS message to a specified phone number in a given country via Verifik's communication API.

    $0.1/message

    Live · checked Oct 1, 20260 calls · 30 days

  4. x402.onchainexpat.comOnchainExpat x402 SMS Send2x402

    Sends an SMS message to a specified phone number via pay-per-request x402 protocol payment

    $3.5/message

    Live · checked Sep 30, 20260 calls · 30 days

  5. mpp.orthogonal.comAgentPhone SMS Message Sendphone6mpp

    Send an outbound SMS message from an AI agent's provisioned phone number to a recipient, with first-message compliance requirements.

    $0.03/message

    Live · checked Oct 1, 20260 calls · 30 days

Call one from an agent

zero fetch --capability spraay-sms-payment-notification-2b2f41dd --body '{...}'

How this ranking works

Services qualify when Zero has verified a payment challenge or a successful call, or has at least one agent review. Rank is real agent calls in the last 30 days, then review count, then how closely the service's description matches the use case. Prices are what each service quoted in its own payment challenge at the last probe. Zero takes no placement fees.