Operational trust for AI

Every AI call,
signed & provable.

Attestic is a drop-in, OpenAI- and Anthropic-compatible gateway. It authenticates, routes, and meters every model call — and signs each one into an Ed25519 receipt anyone can verify offline. A living layer of trust under everything your agents do.

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0
SIGNED CALLS TODAY
0
CHAIN INTEGRITY
4
PROVIDERS, ONE ID
Provenance receipt VERIFIED
provider anthropic
model claude-fable-5
tokens 1,284 · 612
cost $0.0193
chain #418,902
ed25519 7f3a9c…b2c1 · merkle 0x9e2f…a1d3
verifiable offline — no trust in Attestic required
Watch a call get signed

Point any client at Attestic.

No SDK required — change one base URL. The next call is routed, metered, and sealed into a verifiable receipt.

bash — api.attestic.ai
What Attestic does

Four guarantees, on every call.

Not a wrapper, not a dashboard — a gateway that turns trust into something you can hand to an auditor, a customer, or a regulator.

01

Auth

Scoped atk_ keys, OAuth exchange-only tokens, per-tenant isolation. The long-lived secret never rides on a call.

02

Policy

One id, every provider. Route across OpenAI, Anthropic, Gemini and NVIDIA with rate limits and budgets enforced, fail-closed.

03

Meter

Real token cost on every call — managed markup or bring-your-own-key per-call. Usage you can bill on, to the micro-dollar.

04

Provenance

Every call hash-chained and Ed25519-signed into a Merkle-verifiable receipt. Anyone can verify it offline, forever.

The living receipt
Trust you can hold —
and check without us.

Each call becomes a signed link in a hash chain. Break any link and verification fails. The proof outlives the request, the session, even Attestic itself.

  • Ed25519 signature over a canonical receipt
  • Hash-chained + Merkle inclusion proof
  • Verify offline with the open SDK — zero trust required
  • Real token cost + provider + model, sealed in
✓
rcpt_a91f · anthropic · claude-fable-5
0x7f3a…b2c1
✓
rcpt_a920 · openai · gpt-5.5
0x9e2f…a1d3 ← prev
✓
rcpt_a921 · gemini · 3.1-pro
0x4c8b…77de ← prev
↻
verifying chain… root reconstructs ✓
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SIGNED RECEIPTS
0
PROVIDERS, ONE API
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OFFLINE-VERIFIABLE
0
TESTS PASSING
How it works

Three lines to provable AI.

1

Point your client

Set base_url to api.attestic.ai. Your OpenAI or Anthropic SDK just works.

2

We sign it

The call is authenticated, routed, metered, and sealed into an Ed25519 receipt in the hash chain.

3

You verify

Read x-attestic-receipt-id and verify the signature + Merkle proof offline — anytime, anywhere.

The attestation ladder

Witness. Notary. Registrar.

Ascending roles of authority in a chain of trust. Start free, scale to dedicated.

Witness
Free
For building & first calls.
  • ✓100 signed calls / day
  • ✓Full provenance receipts
  • ✓Offline verification SDK
  • ✓OpenAI + Anthropic compatible
Start free
MOST PICKED
Notary
$29/mo
For teams shipping to production.
  • ✓25k signed calls included
  • ✓Metered overage, to the µ$
  • ✓BYOK or managed keys
  • ✓Usage + audit API
Choose Notary
Registrar
Custom
For scale & compliance.
  • ✓Volume pricing
  • ✓Dedicated instance + SLA
  • ✓SSO / SCIM (design-partner)
  • ✓Audit export to your SIEM
Talk to us

Proof, not promises.

Point any OpenAI or Anthropic client at Attestic and the next call you make is signed, metered, and yours to verify.

Start freeRead the docs