Do I have to subscribe to call Hermes Plant?

No. Every endpoint is callable pay-as-you-go over x402 with USDC on Base. The monthly plans are for agents and teams that call endpoints often enough that a flat quota beats paying per call.

How does pay-as-you-go billing work?

Your agent calls a Hermes Plant endpoint. The first request returns HTTP 402 with the price, network, and payTo. The agent signs a USDC payment, retries, and receives the deterministic result. There is no monthly minimum and no API key.

What's included in the Agent API Pass at $29/month?

$35 of public-price-weighted endpoint credits per calendar month across trust, safety, and finance. A one-cent safety gate consumes one credit and a $2 analysis consumes 200, eliminating raw-call arbitrage. Past the credit balance, calls fall back to normal per-call x402 pricing. Checkout is self-serve and cancel-anytime.

Is there a free tier?

Yes. Enter your email on the pricing page and we issue an API key instantly — 250 metered calls per calendar month across every agent-services endpoint, no card required. Send the key as an X-API-Key header. Past the free quota, the same call still works per-call over x402, and you can upgrade to the $29 Agent API Pass anytime.

What is Assurance Team at $199/month?

Assurance Team is a founder-assisted design-partner plan for one organization. The implemented MVP binds exact x402 payments and MCP tool calls to organization policy, creates signed decision and receipt records, and retains organization history. We confirm fit and provision access after a rollout call; it is not instant self-serve.

What is Assurance Business at $799/month?

Assurance Business starts with the same implemented assurance spine, then scopes production retention, audit-export, SSO/security, SLA, and private-gateway requirements in a signed design-partner plan. Those scope-dependent features are not represented as already activated or unattended self-serve.

What happens if I hit my plan's monthly quota?

Nothing breaks. Over-quota requests return a clear 429 with your reset date, and the same call can always be made per-call over x402 — so your agent keeps working while you decide whether to upgrade.

What if a call returns a non-deterministic result?

We refund any settled call whose inputs do not reproduce the same output under the documented schema. Determinism is the product — if we fail it, the payment comes back.

Are there volume discounts?

Yes. Talk to us about Enterprise — committed monthly minimums in exchange for per-call discounts, dedicated facilitator capacity, and an SLA with credits.

Pricing for AI agents

Start free. Pay per call. Or anchor a monthly plan.

Grab a free key for 250 calls/month across every endpoint, or call pay-as-you-go over x402 — from $0.01 to $0.25 per call, settled in USDC on Base. Calling endpoints regularly? The Agent API Pass includes $35 of price-weighted endpoint credits for $29/month. Teams that need shared policy, signed receipts, and retained history can scope a founder-assisted Assurance rollout.

74 deterministic calls settled$9.87 paid via x40267 calls last 30d

Free · Start here

No card

Free tier

Enter an email, get an API key, and call every endpoint on us. The fastest way to see deterministic finance and safety results before you commit a cent.

$0/ 250 calls / mo

Every endpoint. Resets on the 1st.

● 250 metered calls per month, every endpoint
● Key issued instantly to your email — no card
● Same deterministic results + evidence as paid
● Per-call x402 fallback past the free quota

Pay-as-you-go · Already live

Pay-as-you-go

The default. Your agent calls an endpoint, signs an x402 payment in USDC, and gets a deterministic result with evidence. No account. No key. No commitment.

$0.01/ call

Endpoint prices range $0.01 — $0.25.

● No API key, no signup
● Pay USDC on Base via x402 facilitator
● Deterministic result + evidence per call
● Discoverable via OpenAPI, llms.txt, x402 manifest, MCP card
● Every settled call on the public proof ledger

Start a paid call Read API docs

Developer entry plan

Agent API Pass

One flat self-serve subscription covers every public trust, safety, and finance endpoint. This is API access, not a shared assurance workspace.

$29/ month

● $35 of public-price-weighted endpoint credits per month
● Account session or verified agent token
● Per-call x402 fallback past quota
● Self-serve checkout and billing portal
● No organization assurance history

Founder-assisted design partner

Assurance Team

Approve and prove agent purchases for one organization with the implemented assurance MVP and direct rollout support.

$199/ month

Provisioned after a fit and implementation call.

● Organization-scoped x402 and MCP policy
● Exact resource, amount, tool, and argument binding
● HMAC-signed decision and receipt records
● Organization history and drift-evidence schema
● 7,500 public endpoint calls while active

Apply for founder-assisted rollout

Founder-assisted production scope

Assurance Business

For production programs that need the assurance spine plus explicitly scoped retention, audit-export, security, or SLA requirements.

$799/ month

Scope-dependent features are confirmed in writing.

● Implemented Team assurance spine
● 15,000 public endpoint calls while active
● Production retention and export requirements scoped
● SSO and security review planning
● No claim of instant self-serve or pre-activated SLA

Scope a production design partnership

Plan 5 · Contracted

Enterprise

Committed minimum monthly volume in exchange for per-call discounts, a production SLA with service credits, dedicated x402 facilitator capacity, security review, and invoiced billing (ACH / wire / USDC) with PO support.

Talk to the founder Email directly

Endpoint price ladder

The full per-call price list

Every endpoint is callable today. DealAnalyzer is the flagship — full deal underwriting in a single call.

Agent Action Safety Quick Gate$0.01/call
Agent Action Safety Loop$0.25/call
x402 Demand Provenance Check$0.05/call
Assurance Attest$0.05/call
Payment Policy Decision API$0.05/call
Evidence Verification API$0.05/call
MCP Server Risk Analyzer$0.05/call
DestructGuard Command Score$0.10/call
ReviewQueue Agent Submit$0.25/call
EmailGuard$0.02/call
WalletGuard$0.10/call
CashflowLens$0.20/call
WaterfallLens$0.25/call
OptionLens$0.25/call
BondLens$0.25/call
PortfolioGuard$0.15/call
DealAnalyzer$0.25/call
Agent Spend Assurance$0.25/call
Investment Evidence Bundle$0.25/call

Risk reversal

Refund any non-deterministic call.

Determinism is the product. If a settled call's documented inputs do not reproduce the same output, we refund the payment.

First $1 of calls free.

The first 100 verified agents get a $1 credit grant — wire your agent against a real endpoint before committing.

Review live proof Claim the $1 credit

Compare plans

Side-by-side feature comparison.

Browse endpoints →

Feature	Pay-as-you-go	Agent API Pass	Assurance Team	Assurance Business	Enterprise
Monthly public-endpoint allowance	Pay per call	$35 weighted credits	7,500 calls	15,000 calls	Custom
Every public endpoint included	Pay per call	●	●	●	●
Per-call x402 fallback	●	●	●	●	●
Organization-scoped policy	Per-call input	Per-call input	●	●	●
Signed decision + receipt records	Attest $0.05/call	Attest in quota	●	●	●
Organization assurance history	—	—	●	Extended scope	Custom
x402 + MCP exact binding	Payment Policy / MCP Risk	In quota	●	●	●
Active-probe drift evidence schema	—	—	●	●	●
Founder rollout support	—	—	●	●	●
Audit export / SSO / SLA	—	—	—	Scoped, not pre-activated	Custom contract

Who buys this

Built for teams that let agents discover tools, spend money, or take consequential actions.

Hermes Plant is wired into agents shipping inside real fintech, PE, and crypto operations. If your agent freelances finance math, you are one wrong IRR away from a bad day.

Agent platform teams
Autonomous procurement agents
Fintech and treasury operators
MCP tool administrators
AI security and governance teams
Production agent developers

Frameworks we play nice with

LangChain. CrewAI. AutoGen. MCP. OpenAI Agents SDK.

Endpoints are plain HTTP with an x402 challenge — any agent framework that can sign a USDC payment and retry a request can call them. We publish llms.txt, an OpenAPI spec, and an MCP server card so your agent discovers the right endpoint without you wiring config.

LangChainCrewAIAutoGenMCPOpenAI Agents SDKx402 facilitatorUSDC on Base

Pricing FAQ

Questions agents and finance teams ask first.

Do I have to subscribe to call Hermes Plant?: No. Every endpoint is callable pay-as-you-go over x402 with USDC on Base. The monthly plans are for agents and teams that call endpoints often enough that a flat quota beats paying per call.
How does pay-as-you-go billing work?: Your agent calls a Hermes Plant endpoint. The first request returns HTTP 402 with the price, network, and payTo. The agent signs a USDC payment, retries, and receives the deterministic result. There is no monthly minimum and no API key.
What's included in the Agent API Pass at $29/month?: $35 of public-price-weighted endpoint credits per calendar month across trust, safety, and finance. A one-cent safety gate consumes one credit and a $2 analysis consumes 200, eliminating raw-call arbitrage. Past the credit balance, calls fall back to normal per-call x402 pricing. Checkout is self-serve and cancel-anytime.
Is there a free tier?: Yes. Enter your email on the pricing page and we issue an API key instantly — 250 metered calls per calendar month across every agent-services endpoint, no card required. Send the key as an X-API-Key header. Past the free quota, the same call still works per-call over x402, and you can upgrade to the $29 Agent API Pass anytime.
What is Assurance Team at $199/month?: Assurance Team is a founder-assisted design-partner plan for one organization. The implemented MVP binds exact x402 payments and MCP tool calls to organization policy, creates signed decision and receipt records, and retains organization history. We confirm fit and provision access after a rollout call; it is not instant self-serve.
What is Assurance Business at $799/month?: Assurance Business starts with the same implemented assurance spine, then scopes production retention, audit-export, SSO/security, SLA, and private-gateway requirements in a signed design-partner plan. Those scope-dependent features are not represented as already activated or unattended self-serve.
What happens if I hit my plan's monthly quota?: Nothing breaks. Over-quota requests return a clear 429 with your reset date, and the same call can always be made per-call over x402 — so your agent keeps working while you decide whether to upgrade.
What if a call returns a non-deterministic result?: We refund any settled call whose inputs do not reproduce the same output under the documented schema. Determinism is the product — if we fail it, the payment comes back.
Are there volume discounts?: Yes. Talk to us about Enterprise — committed monthly minimums in exchange for per-call discounts, dedicated facilitator capacity, and an SLA with credits.

Start the first deterministic call

Wire one endpoint into your agent. See the evidence. Decide on a plan.

Free, x402 pay-as-you-go, and the $29 Agent API Pass are live and self-serve. Assurance Team and Business are founder-assisted design-partner offers; we confirm scope before provisioning or billing.

Browse endpoints Start the Agent API Pass Enterprise quote