x402 Agent Services Dex Quote API
The Dex Quote API from x402 Agent Services — 1 operation(s) for dex quote.
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curl "https://apis.io/api/v1/apis/call402-com:call402-com-dex-quote-api"
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OpenAPI Specification
openapi: 3.2.0
info:
title: x402 Agent Services Dex Quote API
version: 1.0.0
contact:
name: x402 Agent Services
url: https://call402.com/
x-guidance: 'All /api/* endpoints are pay-per-call via x402 v2 (exact, Base mainnet, USDC). Call any endpoint without payment to receive the live 402 challenge with exact price, network, asset and payTo; the runtime 402 response is authoritative over this document. Pay with any x402 client (e.g. @x402/fetch) and retry with the PAYMENT-SIGNATURE header. Free endpoints: /, /pricing, /stats, /health, /openapi.json, /llms.txt, /.well-known/x402.json, /.well-known/agent.json, and POST /mcp for initialize/tools/list.'
description: USDC pay-per-call APIs for AI agents via the x402 protocol (v2, exact, Base mainnet). Send a request, receive HTTP 402 with payment requirements, pay with @x402/fetch or any x402 client, retry with the PAYMENT-SIGNATURE header.
servers:
- url: https://call402.com
tags:
- name: Dex Quote
paths:
/dex-quote:
post:
summary: On-chain long-tail DEX quote
description: Self-computed long-tail EVM token quotes from public on-chain DEX pools on Base, BNB Smart Chain and Ethereum. Discovers Uniswap V2/V3 and PancakeSwap pools with eth_call; majors are excluded. V3 depth is estimated. Informational only.
operationId: On_chain_long_tail_DEX_quote
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.005'
protocols:
- x402: {}
network: eip155:8453
asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
payTo: '0xAc6F1C3C3b17040730F16dC24Ee9993e9565BE4A'
scheme: exact
requestBody:
required: true
content:
application/json:
schema:
type: object
properties:
chain:
type: string
enum:
- base
- bsc
- ethereum
token:
type: string
required:
- chain
- token
example:
chain: base
token: '0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed'
responses:
'200':
description: Success (after x402 payment settles)
content:
application/json:
schema:
type: object
description: Tool result payload; per-endpoint fields are documented in the docs page and llms.txt
example:
chain: base
token: '0x4ed4E862860beD51a9570b96d89aF5E1B0Efefed'
symbol: DEGEN
price_usd: 0.0042
pool: Uniswap V3
note: Self-computed from public pool state; V3 depth estimated. Informational only.
'400':
description: Invalid input
'402':
description: Payment Required — x402 v2 challenge in PAYMENT-REQUIRED header
headers:
PAYMENT-REQUIRED:
schema:
type: string
description: Base64-encoded PaymentRequired JSON
tags:
- Dex Quote
x-x402:
version: 2
network: eip155:8453
asset: '0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913'
payTo: '0xAc6F1C3C3b17040730F16dC24Ee9993e9565BE4A'
facilitator: https://api.cdp.coinbase.com/platform/v2/x402