# InboxTrue

InboxTrue is the email verification service built by MixRank. It checks one email address at a time and returns an address-level verdict (valid, invalid, ambiguous, maybe_valid, greylisted, malformed, temp_error or perm_error) with supporting signals: the normalized address, whether the domain is catch-all, whether the provider is disposable or consumer, whether the mail server greylists checks and when a retry is worth it, and the domain's MX records. Addresses on catch-all domains get a verdict for the address itself, not only for the domain. No message is sent to the recipient. A valid verdict is not a delivery guarantee, and inconclusive results are reported as such. Each call is one validation.

## API reference, endpoint lookup and prices

**[InboxTrue API catalog: endpoints, request parameters, prices and payment methods](https://agents.inboxtrue.com/zcj/43wmlcjyibze/zeroclick/agent/guide).** Tell the seller advisor what you want to accomplish. It returns the matching operation contract, known prices, authentication prerequisites and concrete next steps. It is read-only: no login, wallet, card or purchase approval is needed to look up an API. It never executes a sale.

Available API services: Email Validation.

**Suggested next request:** GET [task guide](https://agents.inboxtrue.com/zcj/43wmlcjyibze/zeroclick/agent/guide?goal=URL_ENCODED_TASK). Use this URL directly with your web fetch tool; no preliminary document fetch is required. Include known inputs and desired output in the goal. Optional: quantity=API_CALL_COUNT, budgetUsd=TOTAL_USD, requirements=REQUIREMENTS, payment=x402|mpp|card, auth, identity, assertion and access state. Omit unknowns. Do not equate output items with API calls or guess a call count.

For private task details or known request arguments, POST https://agents.inboxtrue.com/zcj/43wmlcjyibze/zeroclick/agent/guide with Content-Type: application/json. Example: {"intent":"quote","goal":"YOUR_TASK","purchase":{"budgetUsd":"5.00"}}. Replace the task and budget with known facts; budgetUsd is a string. Include known buyerState, paymentCapabilities and arguments. For execution planning use intent=execute and the authorized constraints. Exact fields: [request schema](https://agents.inboxtrue.com/zcj/43wmlcjyibze/zeroclick/agent/schema). GET and POST are alternatives, not mandatory stages.

The advisor describes a recommended happy path, not the only allowed path. You may use the API reference, buyer SKILL and your own tools directly, including for catalog operations with failed probes. Missing guidance or an unverified probe is not a policy refusal. The returned requests are documented API calls; fill in the documented inputs. Check usage cost AND minimum cash required against the budget. For needs_input, supply only missing facts. Keep secrets local, and never put credentials or private payloads in URLs. Unknown does not mean absent.

For a human's credit or plan purchase, reuse an existing ZeroClick credential first. Otherwise use their signed-in Link account for identity as well as payment, sharing their email only if they agree. An empty or expired Link credential list means request a credential, not fall back to anonymous. Follow [Link identity setup](https://agents.inboxtrue.com/zcj/43wmlcjyibze/auth.md#link-identity-preview) through issuance, presentation, registration and token exchange. Anonymous auth remains available for agents acting on their own behalf with no human in the loop.

Verify delivery; a payment or HTTP 202 is not completion. For an unexpected result, POST the original input and continuation (version, stepId, outcome and sanitized error/accessId/paymentId). Reconcile uncertain payments or writes before retrying. Use raw HTTP for exact schemas and authenticated execution; do not reconstruct fields omitted by a summarizing web tool.

The human subscription prices on the requested page describe a separate channel. Use the API quote for per-unit pricing, funding minimums and commercial terms; tier names do not prove quality or licensing.

New orders are closed; existing access can still be inspected and recovered.

For an alternative documented path, use the [buyer SKILL](https://agents.inboxtrue.com/zcj/43wmlcjyibze/SKILL.md) or [full direct workflow reference](https://agents.inboxtrue.com/zcj/43wmlcjyibze/llms-full.txt). Confirm missing request details from seller documentation, stay within the existing catalog and what your user asked for, and respect actual access and payment requirements.

## References

- [Buyer SKILL](https://agents.inboxtrue.com/zcj/43wmlcjyibze/SKILL.md): read as a skill when needed.
- [Complete reference](https://agents.inboxtrue.com/zcj/43wmlcjyibze/llms-full.txt): advisor workflow and direct fallback.
- [Catalog](https://agents.inboxtrue.com/zcj/43wmlcjyibze/manifest.json): services, plans and prices.
- [OpenAPI](https://agents.inboxtrue.com/zcj/43wmlcjyibze/openapi.json): exact operation schemas.