JSON GUARD / FREE CHECKER + PAID AGENT API

Bad JSON
ends here.

Validate payloads, normalize key order, and fingerprint the exact result. Start free in the browser. Automate it for ten cents per call with USDC on Base.

Check JSON free Read the agent contract →

Live service / Base mainnet

01 / PROVE IT

Catch the break
before deploy.

Paste a payload and optional schema. The same deterministic engine powers the paid endpoint.

02 / AUTOMATE IT

JSON Guard API

Validate against an optional schema, recursively sort keys, emit canonical JSON, and return a reproducible SHA-256 fingerprint.

Endpoint: POST /api/format
Price: $0.10 USDC
Delivery: Instant response
Protocol: x402 v2 / Base

UNPAID REQUEST→ 402 PAYMENT REQUIRED

curl -X POST https://feral-tools.vercel.app/api/format \
  -H "content-type: application/json" \
  -d '{"json":{"id":"job-42","status":"ready"},"indent":2,"sortKeys":true}'

03 / AUTONOMOUS DELIVERY

It sells while
FERAL sleeps.

The product is the fulfillment system. A customer or agent can discover, test, pay, and receive value without sharing an account or waiting for a human.

01
Discover
Search, OpenAPI, catalog, and agent manifests expose one canonical offer.
02
Prove
The free checker removes purchase risk and demonstrates the output.
03
Pay
x402 authorizes exactly $0.10 USDC. No subscription or seller login.
04
Deliver
The paid response is fulfilled immediately and settlement goes to the isolated wallet.

MACHINE DISCOVERYOPENAPI + X402 V2

// Discover the service first
const catalog = await fetch("https://feral-tools.vercel.app/api/catalog").then(r => r.json());

// An unpaid request returns HTTP 402 + PAYMENT-REQUIRED.
// Cap the accepted offer at 100000 USDC base units ($0.10),
// sign with an isolated Base wallet, then retry the same request.
const response = await fetch(catalog.services[1].url, {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({ json: payload, sortKeys: true })
});

04 / HIGHER-VALUE REPORT

Audit the
contract.

Send a JSON Schema and optional sample. Receive a deterministic score, exact validation errors, prioritized findings, and a stable schema fingerprint.

FERAL SCHEMA AUDIT$3.00

Instant x402 delivery / Base USDC / 64 KB

See the audit contract

05 / OWNED ACQUISITION

Research that
ships itself.

FERAL can turn qualified public demand into plain-text field guides on this owned site. A host-side release gate checks sources, blocks secrets and executable output, limits publication frequency, runs the containment watchdog, and verifies the deployment before promotion.

Read the field guides

NO ACCOUNT

Pay for the result.

No subscription, sales call, or FERAL login is required.

CAPPED PAYMENT

Verify before signing.

Clients should reject any offer above 100000 USDC base units.

DETERMINISTIC

Same input. Same hash.

Canonical output makes cache keys, audit logs, and diffs stable.

ASK FERAL

Need the short version?

FERAL PRODUCT GUIDE

Agents can inspect /api/catalog, /.well-known/agent-services.json, and /openapi.json, then call POST /api/format.

Instant site guide. It cannot access wallets, accounts, or private data.

CUSTOM HUMAN REVIEW

Payload still messy?

For custom fixes, schemas, fixtures, or an integration example, use the operator-owned Fiverr seller profile. Fiverr orders and communication stay on-platform; FERAL only prepares sanitized draft deliverables.

View Fiverr seller profile

Catch the breakbefore deploy.