x402basequality 0.65

Cross-chain bridge quote endpoint — get estimated output, gas cost, and execution time via x402 micropayment.

Price
per_call
Protocol
x402
Verified
no
Endpoint
https://defi.hugen.tokyo/defi/bridge/quote

What it does

The `/defi/bridge/quote` endpoint is part of the DeFi Intelligence API hosted at defi.hugen.tokyo. It returns a cross-chain bridge quote given source and destination chain, token pair, amount, and sender address. The response includes the estimated output amount, execution duration, gas cost in USD, and the bridge tool used (e.g., Stargate). Payment is $0.02 USDC on Base per call via the x402 protocol — no API key or account setup required.

This endpoint is one of 26 DeFi-focused endpoints on the same API surface, which also covers token security audits, rugpull detection, phishing checks, NFT security, protocol TVL, DEX volume, gas prices, and more. The bridge subsystem includes companion endpoints for listing supported chains (`/defi/bridge/chains`), tokens (`/defi/bridge/tokens`), available bridge tools (`/defi/bridge/tools`), advanced route computation (`/defi/bridge/routes`), and transaction status tracking (`/defi/bridge/status`).

The endpoint accepts six required query parameters: `fromChain` (source chain ID or key), `toChain` (destination chain ID or key), `fromToken` and `toToken` (token symbol or contract address), `fromAmount` (amount in smallest unit, e.g., wei), and `fromAddress` (sender wallet address). The sample 402 challenge response shows a Stargate-routed quote bridging USDC from Ethereum to Polygon with an estimated output of 9,950,000 base units (i.e., ~$9.95 USDC), 120-second execution, and $2.50 gas cost. Alternative access methods include a broker API key, an MCP server at mcp.hugen.tokyo, and a Python SDK (`x402-pay`).

Capabilities

cross-chain-bridge-quotebridge-routinggas-cost-estimationmulti-chain-supportx402-micropaymentdefi-data

Use cases

  • —Get a price quote before executing a cross-chain token bridge
  • —Compare bridge output amounts across different chain pairs
  • —Estimate gas costs for bridging assets between EVM chains
  • —Automate bridge selection in an AI agent or trading bot workflow
  • —Pre-flight validation of bridge parameters before submitting a transaction

Fit

Best for

  • —AI agents needing programmatic cross-chain bridge quotes without API key setup
  • —DeFi dashboards displaying real-time bridge cost estimates
  • —Automated trading systems that route assets across chains

Not for

  • —Executing the actual bridge transaction (this endpoint only returns quotes)
  • —Non-EVM chains not supported by the underlying bridge tools
  • —High-frequency quote polling where per-call micropayments become significant

Quick start

# Using the x402-pay Python SDK
pip install x402-pay

import x402_pay
resp = x402_pay.get(
  'https://defi.hugen.tokyo/defi/bridge/quote'
  '?fromChain=1&toChain=137'
  '&fromToken=USDC&toToken=USDC'
  '&fromAmount=10000000'
  '&fromAddress=0xYourWalletAddress'
)
print(resp.json())

Example

Request

{
  "url": "https://defi.hugen.tokyo/defi/bridge/quote",
  "method": "GET",
  "query_params": {
    "toChain": "137",
    "toToken": "USDC",
    "fromChain": "1",
    "fromToken": "USDC",
    "fromAmount": "10000000",
    "fromAddress": "0x1234567890abcdef1234567890abcdef12345678"
  }
}

Response

{
  "tool": "stargate",
  "toChain": "Polygon",
  "toToken": "USDC",
  "fromChain": "Ethereum",
  "fromToken": "USDC",
  "gasCostUSD": "2.50",
  "estimatedOutput": "9950000",
  "executionDuration": 120
}

Endpoint

URLhttps://defi.hugen.tokyo/defi/bridge/quote
Transporthttp
Protocolx402
Pay to0x29322Ea7EcB34aA6164cb2ddeB9CE650902E4f60
CurrencyUSD COIN

Quality

0.65/ 1.00

The endpoint is live (402 challenge captured) with a full OpenAPI spec and clear parameter definitions. However, the response schema is untyped (empty schema object), there are no documented response field descriptions, and the example response is inferred from the 402 challenge sample rather than actual API output. No dedicated pricing page or detailed docs beyond the auto-generated Swagger UI.

Warnings

  • —Response schema is empty in the OpenAPI spec — actual response fields are inferred from the 402 challenge sample only
  • —No dedicated documentation or examples beyond the auto-generated /docs page
  • —Root URL returns 404; no landing page or README available
  • —Price ($0.02 USDC per call) is stated in the 402 challenge but not confirmed on a pricing page

Citations

Provenance

Indexed fromx402_bazaar
Enriched2026-04-22 02:23:00Z · anthropic/claude-opus-4.6 · v2
First seen2026-04-21
Last seen2026-04-22

Agent access

JSONhttps://clawmart.sh/api/listings/FFdzbC