Best for
Agents that need a short-lived address for verification mail, sign-in links, receipts, and other inbound workflows.
Service / inbox.receive
Agent Inbox
Lease one random receive-only email address for 60 minutes.
01 / Outcome
What this service does
One paid create returns a random receive-only address for 60 minutes. Wait, list, read, then delete it or let it expire.
Returns
An inbox identity, random address, hard expiry, and private bearer capability for messages and clean attachments.
02 / Price
One clear Ausca price.
The catalog defines the range. Live preparation or the payment challenge returns binding terms.
Ausca price
$0.05
Fixed price for one complete service lease. Lifecycle calls inside it do not charge again.
Read the service SKILL.mdExact terms
- Model
- fixed
- Minimum
- 5 USD-minor
- Maximum
- 5 USD-minor
The live preparation or payment challenge is binding. This page never invents a price.
03 / Contract
Pinned before execution.
These values are generated from the active, digest-verified catalog revision.
- Status
- Active
- Offer
- inbox.receive
- Revision
- receive-60m-r1
- Execution
- Bounded
- Input artifact
- Up to 0 bytes
- Bounded wait
- 30 seconds
- Result retention
- 0 seconds
- Inline result
- Up to 4 KiB
- Receipt evidence
- Required at success
- Revision digest
- sha256:c63bc5c4f8208d7063075af8ee01b23490080553cf6d5be8fd7e624a5cc5fa0f
- Input schema digest
- sha256:b9e9ff5bfde987c9125ec46553c7b0341f3933f49f5e62283b84e8c4f67e78ae
- Output schema digest
- sha256:01877423c3ee9db3adda95e24a07be35cee1731aa9c9a70b100513b1157575ff
04 / Invoke
Use the entry point that fits.
Start with SKILL.md for agents, HTTP + x402 for HTTP integrations, or MCP for generated tools.
SKILL.md Recommended for agents
Start from the exact versioned instructions for this service. The skill describes the capability, inputs, payment boundary, retry identity, and evidence without requiring an agent to scrape this page.
curl --fail --silent --show-error https://ausca.com/skills/agent-inbox/SKILL.md Exact identity: ausca/agent-inbox@0.1.0, digest
sha256:e57440d1f1367c4c4fcfbcd6b0b01e70d1d59a3908c632d194d7245f877e7de2.
HTTP + x402 HTTP client
Send the exact invocation envelope without payment material to discover live binding terms. Use a supported x402 client for the authorized retry; do not paste a sample signature.
curl --request POST https://ausca.com/v1/invocations \
--header 'Content-Type: application/json' \
--data @ausca-agent-inbox-request.json{
"canonicalizer_version": "runx.receipt.c14n.v1",
"idempotency_key": "ausca-inbox-receive-example-0001",
"input": {},
"input_schema_digest": "sha256:b9e9ff5bfde987c9125ec46553c7b0341f3933f49f5e62283b84e8c4f67e78ae",
"offer_id": "inbox.receive",
"offer_revision": "receive-60m-r1",
"offer_revision_digest": "sha256:c63bc5c4f8208d7063075af8ee01b23490080553cf6d5be8fd7e624a5cc5fa0f",
"output_schema_digest": "sha256:01877423c3ee9db3adda95e24a07be35cee1731aa9c9a70b100513b1157575ff"
} Expected first response: 402 with matching x402 v2
PAYMENT-REQUIRED header and body. A valid paid retry returns the admitted or replayed
invocation.
MCP Discovery and control
MCP projects the same Ausca contract. Paid invocation is disabled by default and must be enabled deliberately by a compatible host. MCP does not carry x402 HTTP headers.
{
"jsonrpc": "2.0",
"id": "agent-inbox-example",
"method": "tools/call",
"params": {
"name": "ausca_invoke_offer",
"arguments": {
"canonicalizer_version": "runx.receipt.c14n.v1",
"idempotency_key": "ausca-inbox-receive-example-0001",
"input": {},
"input_schema_digest": "sha256:b9e9ff5bfde987c9125ec46553c7b0341f3933f49f5e62283b84e8c4f67e78ae",
"offer_id": "inbox.receive",
"offer_revision": "receive-60m-r1",
"offer_revision_digest": "sha256:c63bc5c4f8208d7063075af8ee01b23490080553cf6d5be8fd7e624a5cc5fa0f",
"output_schema_digest": "sha256:01877423c3ee9db3adda95e24a07be35cee1731aa9c9a70b100513b1157575ff"
}
}
} Expected response: the generated invocation result shape. Use
ausca_get_invocation for authoritative state and the receipt reference.
05 / Lifecycle
One purchase identity to terminal state.
The purchase creates one replay-safe address. Receiving and reading mail inside the lease does not charge again.
- 01 payment terms
- 02 address active
- 03 receive and read
- 04 deleted or expired
Use a bounded long poll or list with the returned opaque cursor. Message bodies are inert, and only clean attachments receive download access.
Delete is idempotent. Hard expiry ends access immediately while retained message and attachment cleanup completes safely.
06 / Contract examples
A complete request, from authority.
The offer has no caller-selected address. Keep the same idempotency key when retrying an uncertain purchase.
{
"canonicalizer_version": "runx.receipt.c14n.v1",
"idempotency_key": "ausca-inbox-receive-example-0001",
"input": {},
"input_schema_digest": "sha256:b9e9ff5bfde987c9125ec46553c7b0341f3933f49f5e62283b84e8c4f67e78ae",
"offer_id": "inbox.receive",
"offer_revision": "receive-60m-r1",
"offer_revision_digest": "sha256:c63bc5c4f8208d7063075af8ee01b23490080553cf6d5be8fd7e624a5cc5fa0f",
"output_schema_digest": "sha256:01877423c3ee9db3adda95e24a07be35cee1731aa9c9a70b100513b1157575ff"
}{
"resource_lease": {
"address": "inbox+0123456789abcdef0123456789abcdef01234567.89abcdef01234567@mail.ausca.com",
"created_at": "2026-09-01T00:00:00Z",
"expires_at": "2026-09-01T01:00:00Z",
"inbox_id": "inb_0123456789abcdef0123456789abcdef01234567",
"schema": "ausca.agent_inbox.lease.v1",
"state": "active"
}
}SKILL.md: https://ausca.com/skills/agent-inbox/SKILL.md
Service: https://ausca.com/services/agent-inbox
Offer: inbox.receive
Revision: sha256:c63bc5c4f8208d7063075af8ee01b23490080553cf6d5be8fd7e624a5cc5fa0f
Input schema: https://ausca.com/schemas/offers/agent-inbox.input.schema.json
Output schema: https://ausca.com/schemas/offers/agent-inbox.output.schema.json
Endpoint: POST https://ausca.com/v1/invocations
Pricing: fixed; resolve binding terms from live preparation or payment challenge.Inbound mail is bounded, normalized, and isolated per inbox. Outbound mail authority is structurally absent.