TELAGO Korea Execution Intelligence x402 Preflight API

x402

TELAGO Korea Execution Intelligence x402 Preflight API is a paid API for AI agents from telago-x402-discovery.vercel.app, paid per call via x402, $0.001/call, status unknown (last checked 2026-10-13).

Validates whether a given URL is a properly configured x402 pay-per-call endpoint before attempting payment, returning a structured PAYABLE/UNPAYABLE verdict with detailed checks.

Price / call$0.001

Seller volume →—

Success—

StatusUnknown

How this service works

Pay-per-call Korea execution intelligence for AI agents: address geocoding, building access, last-meter delivery, field service, robotics and cross-border logistics.

Output

Returns a JSON object with a 'verdict' field ('PAYABLE' or not), a set of boolean checks (https, reachable, publicHost, returns402, amountValid, payToPresent, acceptsPresent, networkPresent, challengeParsed, eip712DomainPresent), the HTTP status code, x402 protocol version, selected payment details (asset address, payTo wallet, network, amountUsd, amountAtomic), and a reasons array explaining any failures.

Example use cases

Pre-payment endpoint validation

“I'm about to call a pay-per-call Korea last-mile delivery API — can you run a preflight check on https://telago-x402-discovery.vercel.app/api/last-mile to make sure it's a legitimate x402 endpoint that will actually accept my USDC payment on Base before I send anything?”

x402 integration debugging

“My agent is failing to pay an x402 API and I'm not sure if the endpoint is misconfigured — can you preflight-check https://telago-x402-discovery.vercel.app/api/field-service and tell me exactly which x402 checks are passing or failing, like whether it returns a 402, has a valid EIP-712 domain, and includes a payTo address?”

Discovering payment parameters before calling

“I want to call the TELAGO Korea building-access API but I need to know the exact USDC amount and the wallet address to pay before I commit — can you preflight https://telago-x402-discovery.vercel.app/api/building-access and give me the payment amount and payTo address?”

Technical details

Endpoint

GEThttps://telago-x402-discovery.vercel.app/preflight?utm_source=zero.xyz

When to prefer

Use this endpoint when you need to validate an x402-protocol API before committing a blockchain micropayment — especially when building autonomous agent workflows that must confirm an endpoint is reachable, properly configured, and will accept USDC on a specific EVM network. Prefer this over blindly calling a pay-per-call endpoint when you want to avoid wasted payments on misconfigured or unreachable services. Also use it for debugging x402 integrations or dynamically discovering payment parameters (wallet address, amount, network) at runtime.

Side effects

Target URL is unreachable — reachable check returns false, verdict is not PAYABLE
Target URL does not return HTTP 402 — returns402 check fails
Missing or malformed EIP-712 domain in response — eip712DomainPresent is false
No payTo address present in the 402 challenge — payToPresent check fails
Invalid or zero payment amount — amountValid check fails
Target URL uses HTTP instead of HTTPS — https check fails
Network field absent or unrecognized in challenge — networkPresent check fails
Input URL is malformed or below minimum length — input validation error before any call is made

Input

Schema · Request body

Field	Type	Description
inputrequired	object
output	object

Output

Schema · Response

{
  "type": "json",
  "example": {
    "ok": true,
    "checks": {
      "https": true,
      "reachable": true,
      "publicHost": true,
      "returns402": true,
      "amountValid": true,
      "payToPresent": true,
      "acceptsPresent": true,
      "networkPresent": true,
      "challengeParsed": true,
      "eip712DomainPresent": true
    },
    "product": "X402_ENDPOINT_PREFLIGHT_API",
    "reasons": [],
    "verdict": "PAYABLE",
    "httpStatus": 402,
    "x402Version": 2,
    "selectedAccept": {
      "asset": "0x...",
      "payTo": "0x...",
      "network": "eip155:8453",
      "amountUsd": 0.001,
      "amountAtomic": "1000"
    }
  }
}

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