// MCP + HTTP · x402 on Base · 32 products

Pay-per-call evidence and preflight utilities for agents

Give an agent a bounded, deterministic check at the moment it needs one. Discover schemas for free, inspect the payment requirement before spending, and pay only for the execution you choose.

Browse the live product catalog Install from GitHub $0.05–$0.25 USDC per call

Built for an agent to inspect before it spends

The gateway separates discovery from execution. Product descriptions, input schemas, prices, OpenAPI metadata, MCP tools, and deterministic sample fixtures are public. A paid route first returns exact x402 payment terms; execution follows only after the client supplies a valid payment.

agent-gateway / v0.11.0

discover → catalog + schemas + fixtures free

request → exact price + Base USDC payment terms

authorize → client confirms product and maximum price

execute → deterministic result + versioned evidence receipt

Thirty-two focused products, not one opaque router

Twenty-two focused preflights cost $0.05 per call. Ten evidence and maintained-public-data utilities cost $0.25. The live catalog is the source of truth for each product's current scope, schema, price, and limitations.

13 operational preflights · $0.05 each

Operational preflights

Shopify CSV, image-to-SKU matching, UTM links, gitignore coverage, unsubscribe headers, npm publish payloads, redirect maps, subtitle timelines, calendar time zones, filename portability, CSV schema drift, release artifact manifests, and email DNS authentication evidence.

9 agent-evidence checks · $0.05 each

Agent evidence and evaluation

Promise-to-action evidence, tool-call contracts, completion receipts, tool descriptions, skill activation, cost decomposition, API drift, webhook replay, and policy-change evidence.

10 evidence and data utilities · $0.25 each

Evidence, distribution, and maintained-data utilities

Audit agent runs and completion evidence, reconcile qualified demand and channel proof, or query bounded maintained public-data products. Every result keeps its evidence and limitations visible.

Connect through MCP, npm, or HTTP

Hosted MCP: connect a Streamable HTTP client to the public MCP endpoint for tool and schema discovery.
Guarded stdio client: install @justhandledlabs/agent-client@0.11.1 for controlled paid execution.
Direct HTTP: build against the OpenAPI 3.1 contract and per-product routes.
Registry identity: use io.github.justhandledlabs/agent-gateway in the official MCP Registry.
Free test data: inspect the deterministic sandbox fixtures before making a paid call.

Bounded by design

Utility implementations are deterministic and versioned; they do not improvise with an LLM behind the route.
The current live catalog is the source of truth for exact products, prices, schemas, limitations, and endpoints.
Raw utility inputs and results are not persisted by the gateway.
A passing preflight is a bounded signal about the supplied evidence, not a guarantee about an external system or outcome.
The maintained utility implementations stay hosted; the public client exposes the integration and payment guardrails.

Questions

What does the gateway sell?

Thirty-two deterministic preflights, maintained-data lookups, and evidence packets across agent evidence, public data, developer tools, commerce, marketing, email, web operations, media, and productivity.

Which agent utilities were added in version 0.5?

Version 0.5 added Chicago demolition-permit change packets, site-discovery change packets, CSV schema-drift preflights, release-artifact manifest validation, and email DNS authentication evidence checks.

How does an agent pay?

Paid execution uses exact-price USDC payments through x402 on Base. Discovery, schemas, OpenAPI metadata, MCP tools, and sample fixtures are free.

Does the gateway store agent inputs or results?

No raw utility inputs or results are persisted. See the commercial telemetry document for the limited event data that may be recorded.

Can I test the integration without paying?

Yes. Read the live catalog and schemas, inspect the OpenAPI contract, enumerate MCP tools, and run against the published deterministic fixtures before authorizing a payment.

Inspect the contract before the first call

Start with the live catalog, choose one bounded product, and set the client’s maximum accepted price.

Open product catalog View client and examples