Retries without duplicate faxes
Every send can carry a stable idempotency key, so tool retries return the original fax object instead of paying for a second transmission.
Fax API for AI agents
Fax API for agents that need a receipt.
One endpoint for regulated document delivery. Idempotent sends, dry-run validation, signed delivery webhooks, and docs your agent can actually read.
Quickstart
Dry-run it before you send it.
Agents can prove the number, the document URL, and the request shape are valid before spending money or
transmitting a regulated document. Flip dry_run off and the same request sends for real.
curl https://agentfax-api.scshome.workers.dev/v1/faxes \
-H "Authorization: Bearer afx_live_..." \
-H "Content-Type: application/json" \
-H "Idempotency-Key: contract-8921-v1" \
-d '{
"to": "+13125550123",
"media_url": "https://example.com/contracts/8921.pdf",
"client_reference": "contract-8921",
"dry_run": true
}'{
"fax": {
"id": "fax_9b2f4e81c6d34a08b2ee71c3a90d55f2",
"object": "fax",
"status": "validated",
"to": "+13125550123",
"client_reference": "contract-8921",
"idempotency_key": "contract-8921-v1",
"created_at": "2026-07-03T14:02:09Z"
},
"dry_run": true
}Validate before transmit
Agents can prove request validity before sending regulated, expensive, or irreversible documents.
Delivery state as data
Fax state is normalized into queued, sending, delivered, failed, and canceled — polled or pushed over signed webhooks.
OpenAPI and llms.txt
Machines get small, explicit docs. Humans get a direct quickstart, error model, and webhook guide.
Built for machine readers
Point your agent at one file.
The entire API fits in a prompt. Hand your agent llms.txt for the rules, or the OpenAPI
schema for the full contract — no scraping, no guessing.
Get started
Put a paper trail behind your agent.
Onboard through Stripe, get an API key, and send your first dry run in minutes.
Developer plan · $49/month · billed through Stripe