Send emails via no-reply@questflow.ai through a pay-per-use x402 agent endpoint.
What it does
This Questflow x402 endpoint exposes an AI agent that can send emails using the no-reply@questflow.ai address. It is accessed via the x402 payment protocol on the Base network, paying in USDC (asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913). The agent accepts a POST request with a single `input` string field describing what you want, and returns a string `response` from the agent.
Payment is handled inline via the X-PAYMENT header using the x402 exact scheme. The maximum amount required per call is 100,000 units of USDC (likely 0.10 USDC given 6-decimal precision), with a maximum timeout of 1,200 seconds (20 minutes). The agent is hosted on Questflow's platform, which broadly focuses on autonomous AI agents for onchain markets, though this particular agent is scoped to email sending.
Documentation is minimal — there is no OpenAPI spec, no dedicated docs page, and the only schema available comes from the x402 challenge response's `outputSchema`. The exact capabilities and limitations of the email-sending agent (e.g., supported recipients, attachments, formatting) are not documented and would need to be tested empirically.
Capabilities
Use cases
- —Sending transactional or notification emails programmatically via an AI agent
- —Integrating email-sending into agent-to-agent workflows with x402 micropayments
- —Triggering email alerts from onchain or automated pipelines
Fit
Best for
- —Developers needing a simple pay-per-use email sending endpoint
- —Agent-to-agent workflows that require email notifications
- —Quick email dispatch without managing SMTP infrastructure
Not for
- —High-volume bulk email marketing campaigns
- —Emails requiring custom sender domains or branded addresses
- —Use cases requiring attachments, HTML templates, or advanced email features (not documented)
Quick start
curl -X POST https://api.questflow.ai/x402/agent/qrn:agent:687df7a9b234010b7d331b17 \
-H "Content-Type: application/json" \
-H "X-PAYMENT: <x402_payment_token>" \
-d '{"input": "Send an email to user@example.com with subject Hello and body Welcome aboard."}'Example
Request
{
"input": "Send an email to user@example.com with subject 'Meeting Reminder' and body 'Don't forget our meeting at 3 PM today.'"
}Response
{
"response": "Email sent successfully to user@example.com with subject 'Meeting Reminder'."
}Endpoint
Quality
Very sparse documentation: no OpenAPI spec, no docs page, no usage examples. The only schema comes from the x402 challenge payload. The response example is entirely inferred. Exact email capabilities, limitations, and formatting are unknown.
Warnings
- —No OpenAPI or dedicated documentation available — all schema info comes from x402 challenge only
- —Response example is inferred; actual response format is unverified
- —Email capabilities (attachments, HTML, recipient limits) are undocumented
- —The exact USDC cost (100000 units) may represent $0.10 assuming 6-decimal USDC, but this is inferred
- —Maximum timeout of 1200 seconds suggests potentially slow processing
Citations
- —Agent accepts POST with an 'input' string field and returns a 'response' string, paid via x402 exact scheme on Base network in USDChttps://api.questflow.ai/x402/agent/qrn:agent:687df7a9b234010b7d331b17
- —maxAmountRequired is 100000, maxTimeoutSeconds is 1200, payTo is 0x06a85ACC47d708ada4872874c5d98aDa3cb705a0https://api.questflow.ai/x402/agent/qrn:agent:687df7a9b234010b7d331b17
- —USDC asset address 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 on Base networkhttps://api.questflow.ai/x402/agent/qrn:agent:687df7a9b234010b7d331b17
- —Description states: Can send email using no-reply@questflow.ai other mail addresshttps://api.questflow.ai/x402/agent/qrn:agent:687df7a9b234010b7d331b17