Travel · x402 · early usage

Check before you pay or trade: pass / review / block for one wallet or contract address…

Check before you pay or trade: pass / review / block for one wallet or contract address (EVM chains, Solana). Use it before you pay, trade with or approve an address: one cheap call returns pass, review or block with the reasons and the list dates.

by twin.unykorn.org · discovered, not yet claimed by its owner · updated 2026-10-12

30d calls6

30d payers6

MethodPOST

Outputjson

Mirrored from Coinbase's public x402 Bazaar. The description is the provider's own text and has not been reviewed here; the payment requirements are copied as published.

What it does

Tags: pre-flight · repeat-use · agent gate · verdict · signed receipt · bazaar

Call contract

Method: POST
Input: json
Output: json
Last paid call: 2026-10-12

Input example from Bazaar metadata

{
  "params": {
    "chain": "base",
    "value": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
  }
}

Output example

{
  "as_of": "2026-10-06T12:30:00Z",
  "cache": {
    "age_s": 0,
    "hit": false,
    "ttl_s": 60
  },
  "check": "address",
  "check_version": "1.0.0",
  "coverage": "full",
  "evidence_sha256": "c1d3b6f0a9e8475d2c6b1a0f9e8d7c6b5a4f3e2d1c0b9a8f7e6d5c4b3a2f1e0d",
  "notice": "Screening signal from public data. Not a legal or compliance determination, not KYC, not advice. Absence from a list is not a clearance.",
  "ok": true,
  "reasons": [
    {
      "code": "CONTRACT",
      "detail": "Bytecode is deployed at this address on Base.",
      "severity": "info",
      "source": "rpc:base"
    }
  ],
  "receipt": {
    "amount_usd": 0.01,
    "receipt_id": "g402-<16hex>",
    "tx_hash": "0x<64hex>"
  },
  "share": {
    "note": "This page shows no payer details. Payments on public chains such as Base are visible on-chain.",
    "url": "https://twin.unykorn.org/check/r/qL3t9Zp0aXvB7nWc2KdR8e"
  },
  "sources": [
    {
      "fetched_at": "2026-10-06T12:00:05Z",
      "id": "ofac_sdn",
      "publisher": "US Treasury OFAC",
      "sha256": "0367408834e4af4d262ccc7e329e300b1a5b1430e1e4bcc4debbdd5b927b4cad",
      "status": "ok",
      "version": "2026-10-02"
    },
    {
      "fetched_at": "2026-10-06T12:00:09Z",
      "id": "eu_fsf",
      "publisher": "European Union (EU consolidated financial sanctions list)",
      "status": "ok",
      "version": "2026-09-22"
    },
    {
      "fetched_at": "2026-10-06T12:00:11Z",
      "id": "uk_sanctions_list",
      "publisher": "UK FCDO (UK Sanctions List)",
      "status": "ok",
      "version": "2026-09-29"
    },
    {
      "fetched_at": "2026-10-06T06:00:00Z",
      "id": "scamsniffer_addresses",
      "publisher": "ScamSniffer (open, 7-day delayed)",
      "status": "ok",
      "version": "5b0e3f1d9a27c64e8f13b2a7d05c9e41f6a8b3c27d1e09f4a6b5c8d7e2f1a0b9"
    },
    {
      "block": 36412290,
      "fetched_at": "2026-10-06T12:30:00Z",
      "id": "rpc:base",
      "publisher": "public RPC (rail provider list)",
      "status": "ok"
    }
  ],
  "subject": {
    "chain": "base",
    "kind": "address",
    "normalized": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "value": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913"
  },
  "subject_salt": "9f2c4e6a8b0d1f3e5a7c9e1b3d5f7a9c",
  "verdict": "pass",
  "verdict_meaning": "Nothing was found in the lists named. A 'no match' means nothing was found in the lists named. It is not a clearance."
}

Use with an agent

Discover. Agents find this listing with GET https://bazaar.saylorinnovations.com/discovery/search?query=…, the MCP tool search_resources, or /discovery/resources.
Inspect. Fetch /resources/53677.json for the price and payment options.
Pay. Call GET https://twin.unykorn.org/check/address. The provider answers 402 with its payment requirements. An x402 client signs one of the options below and retries with PAYMENT-SIGNATURE.
Execute. The provider returns 200 with the data. Agent Bazaar is not in the request path and never sees your payment.

For humans

You don't need an account or an API key; you need a wallet holding a small amount of USDC on Base, Polygon, Solana, and an x402-capable client (see the examples below). Call the endpoint unpaid first to see exactly what it asks for.

Pricing & payment

Price: $0.01 / request
Protocol: x402 v2
Auth: No account or API key. Pay per request.
Networks: Base, Polygon, Solana
Demand: 6 calls · 6 unique payers in 30d (public x402 Bazaar data)

x402 payment requirements

Scheme	Network	Asset	Amount	Pay to	Timeout
exact	Base eip155:8453	USDC	$0.01	0x7d9a65d06dcc435a52D5880C6310Bd6E96c156DB	300s
exact	Polygon eip155:137	USDC	$0.01	0x7d9a65d06dcc435a52D5880C6310Bd6E96c156DB	300s
exact	Solana solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp	USDC	$0.01	52EqTZigRAnBphuYAuREjQJx5H5ryyc1RETpDR2dZFQp	300s

accepts[] (raw JSON)

[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "payTo": "0x7d9a65d06dcc435a52D5880C6310Bd6E96c156DB",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "eip155:137",
    "payTo": "0x7d9a65d06dcc435a52D5880C6310Bd6E96c156DB",
    "asset": "0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "payTo": "52EqTZigRAnBphuYAuREjQJx5H5ryyc1RETpDR2dZFQp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "amountUsd": 0.01,
    "maxTimeoutSeconds": 300
  }
]

Schemas

Output schema (JSON Schema)

{
  "type": "object"
}

Example shape — generated from the schema, not a captured live response

{}

Examples

curl

curl "https://twin.unykorn.org/check/address"
# -> 402 Payment Required, accepts[] lists how to pay
# retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid

JavaScript

const res = await fetch("https://twin.unykorn.org/check/address");
if (res.status === 402) {
  const { accepts } = await res.json();
  // pay one of accepts[] via an x402 client, then retry with the payment header
}

Python

import httpx
res = httpx.get("https://twin.unykorn.org/check/address")
if res.status_code == 402:
    accepts = res.json()["accepts"]
    # pay one of accepts[] via an x402 client, then retry with the payment header

Details

Provider: twin.unykorn.org
Endpoint: https://twin.unykorn.org/check/address
Machine-readable: /resources/53677.json