1gateway Defi API
The Defi API from 1gateway — 1 operation(s) for defi.
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OpenAPI Specification
openapi: 3.2.0
info:
title: 1gateway Defi API
version: 0.1.1
description: '1gateway lets AI agents buy the data and APIs they need, one call at a time: no signup, no API key, paid per request with USDC on Base or Solana via x402. Coverage: company and compliance checks (sanctions, KYB, SEC filings, Korean companies), Korean real estate, trade and macro data, onchain and market data, and agent utilities such as document-to-Markdown. Every response names its source. Failed calls are never charged.'
x-guidance: 'Use this API when an agent needs data as English JSON with pay-per-call access and no signup. Common tasks: Korea apartment sale transactions and district price summaries, Korean public holidays, Korea company KYB (company resolve, profile, NTS business status, DART filings, supplier check), Korean HWP/HWPX to Markdown, web page to Markdown (web read), and document extract (PDF, DOCX, HWP/HWPX or web page to structured JSON). Current coverage is South Korea: apartment sale prices (MOLIT), exports/imports and 10-day export flash (Korea Customs), Bank of Korea statistics (ECOS), weather forecast by lat/lon (KMA), holidays (KASI); more APIs and countries are coming. Base onchain reads: token risk, wallet balances, token info, transaction status. Also: document → Markdown conversion for web pages, PDF, DOCX and Korean HWP/HWPX (price by detected type, decided before payment). Every /v1 endpoint is paid: call it, receive HTTP 402 with PAYMENT-REQUIRED, pay with an x402 client (USDC on Base or Solana, same price) and retry. No charge on failure: settlement happens only on 2xx; 4xx/5xx are never charged. Agent guide: https://1gateway.dev/agents.md. Status: https://1gateway.dev/status. MCP (Streamable HTTP) is available at https://1gateway.dev/mcp: initialize and tools/list are free, tools/call is paid via x402 _meta.'
contact:
email: contact@1gateway.dev
servers:
- url: https://1gateway.dev
tags:
- name: Defi
paths:
/v1/defi/yields:
get:
operationId: defi_yields
summary: 'DeFi lending yields and market TVL on Base: Aave v3, Compound v3, Morpho…'
description: 'Use when an agent must compare lending yields on Base. Input: optional protocol (aave-v3,compound-v3,morpho,moonwell) and asset (USDC,WETH,cbBTC,wstETH,cbETH,EURC). Output: JSON per market supply/borrow APY, utilization, supplied/borrowed amount and TVL in USD, sorted by supply APY, with block. Computed from contract state; base rates, rewards excluded; not advice. Example: ?asset=USDC'
x-payment-info:
price:
mode: fixed
currency: USD
amount: '0.004500'
protocols:
- x402: {}
x-x402:
price: $0.0045
scheme: exact
network: eip155:8453
networks:
- eip155:8453
- solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp
asset: USDC
kind: aggregate
source: 'Base mainnet JSON-RPC: Aave v3 Pool + oracle, Compound v3 Comets, Moonwell mTokens, Morpho Blue and MetaMorpho vaults (Multicall3, cached 120 s); no third-party yield API'
parameters:
- name: protocol
in: query
required: false
description: Comma list of aave-v3, compound-v3, morpho, moonwell (default all). Bad value → 400 before payment (not charged)
schema:
type: string
pattern: ^[A-Za-z0-9,-]{1,64}$
maxLength: 64
example: aave-v3,morpho
- name: asset
in: query
required: false
description: Comma list of USDC, WETH (or ETH), cbBTC, wstETH, cbETH, EURC (default all). Bad value → 400 before payment (not charged)
schema:
type: string
pattern: ^[A-Za-z0-9,]{1,64}$
maxLength: 64
example: USDC
responses:
'200':
description: OK (payment settled). Example is a trimmed real output.
content:
application/json:
schema:
type: object
properties:
chain:
type: string
query:
type: object
properties:
protocol:
type: array
items:
type: string
asset:
type: array
items:
type: string
count:
type: integer
markets:
type: array
items:
type: object
properties:
protocol:
type: string
market:
type: string
contract:
type: string
asset:
type: string
supplyApyPct:
type: number
borrowApyPct:
type:
- number
- 'null'
utilizationPct:
type: number
totalSuppliedTokens:
type: number
totalBorrowedTokens:
type:
- number
- 'null'
tvlUsd:
type: integer
borrowedUsd:
type:
- integer
- 'null'
totals:
type: object
properties:
tvlUsd:
type: integer
byProtocol:
type: object
properties:
aave-v3:
type: integer
compound-v3:
type: integer
morpho:
type: integer
moonwell:
type: integer
asOf:
type: object
properties:
baseBlock:
type: integer
at:
type: string
cache:
type: string
notes:
type: array
items:
type: string
required:
- chain
- query
- count
- markets
- totals
- asOf
- cache
- notes
example:
chain: base
query:
protocol:
- aave-v3
asset:
- USDC
count: 18
markets:
- protocol: moonwell
market: Moonwell mEURC
contract: '0xb682c840B5F4FC58B20769E691A6fa1305A501a2'
asset: EURC
supplyApyPct: 18.4021
borrowApyPct: 19.9548
utilizationPct: 103.1545
totalSuppliedTokens: 310578
totalBorrowedTokens: 320375
tvlUsd: 346378
borrowedUsd: 357304
totals:
tvlUsd: 1808713983
byProtocol:
aave-v3: 795744222
compound-v3: 12676414
morpho: 980620285
moonwell: 19673062
asOf:
baseBlock: 53328737
at: '2026-10-19T00:00:00.000Z'
cache: miss
notes:
- Computed from Base contract state (Aave v3 Pool, Compound v3 Comet, Moonwell mTokens, Morpho Blue + MetaMorpho vaults); no third-party yield API.
'400':
description: Invalid or missing parameters, or URL/domain not allowed (validated before payment where possible; not charged)
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Machine-readable error code, e.g. bad_request, not_found, upstream_error, upstream_unreachable, upstream_not_configured
examples:
- bad_request
message:
type: string
description: Human-readable explanation
examples:
- month must be YYYYMM (e.g. 202409)
required:
- error
'402':
description: Payment Required (x402 v2). Returned for every unpaid request. PAYMENT-REQUIRED response header carries base64 JSON PaymentRequired; retry with PAYMENT-SIGNATURE.
'500':
description: Unexpected server error (not charged)
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Machine-readable error code, e.g. bad_request, not_found, upstream_error, upstream_unreachable, upstream_not_configured
examples:
- bad_request
message:
type: string
description: Human-readable explanation
examples:
- month must be YYYYMM (e.g. 202409)
required:
- error
'502':
description: Upstream source returned an error or an unreadable response (not charged)
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Machine-readable error code, e.g. bad_request, not_found, upstream_error, upstream_unreachable, upstream_not_configured
examples:
- bad_request
message:
type: string
description: Human-readable explanation
examples:
- month must be YYYYMM (e.g. 202409)
required:
- error
'503':
description: Endpoint temporarily disabled or upstream not configured on this server; no 402 is issued (not charged). Check /status, retry later
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Machine-readable error code, e.g. bad_request, not_found, upstream_error, upstream_unreachable, upstream_not_configured
examples:
- bad_request
message:
type: string
description: Human-readable explanation
examples:
- month must be YYYYMM (e.g. 202409)
required:
- error
'504':
description: Upstream source timed out or was unreachable (not charged). Retry after 1-5 min with backoff
content:
application/json:
schema:
type: object
properties:
error:
type: string
description: Machine-readable error code, e.g. bad_request, not_found, upstream_error, upstream_unreachable, upstream_not_configured
examples:
- bad_request
message:
type: string
description: Human-readable explanation
examples:
- month must be YYYYMM (e.g. 202409)
required:
- error
tags:
- Defi
x-x402-network: eip155:8453
x-billing-policy: 'No charge on failure: payment is settled only after the endpoint returns a 2xx response. Any 4xx or 5xx (bad input, no data, upstream error, timeout, disabled endpoint) is not settled, so the signed payment is never collected. Input is validated before the 402 wherever possible. Over MCP, a tool result with isError is not settled either.'
x-error-codes:
- status: 400
codes:
- bad_request
- url_not_allowed
- bad_checksum
- not_a_contract
meaning: Invalid or missing parameters, or a URL/domain that is not allowed.
retry: Fix the input; do not retry as is.
- status: 402
codes: []
meaning: Payment required (x402 v2). The PAYMENT-REQUIRED header holds the exact price.
retry: Pay with an x402 client and retry with PAYMENT-SIGNATURE.
- status: 403
codes:
- not_bok_authored
meaning: Requested table/resource is not served (e.g. statistics not authored by the Bank of Korea).
retry: Do not retry.
- status: 404
codes:
- not_found
- tx_not_found
- tx_not_mined
meaning: No data for the requested period/code yet.
retry: Try an earlier period or another code.
- status: 413
codes:
- too_large
meaning: Document is larger than this server's conversion cap (checked before payment).
retry: Send a smaller document.
- status: 415
codes:
- unsupported_type
- type_mismatch
meaning: Document type not supported or not matching the declared type (before payment).
retry: Do not retry as is.
- status: 502
codes:
- upstream_error
- upstream_bad_response
- upstream_http_error
- rpc_unavailable
- source_http_error
meaning: The upstream source (government API, RPC, target site) returned an error or unreadable data.
retry: Retry after 30-60 s with backoff.
- status: 503
codes:
- endpoint_disabled
- upstream_not_configured
- payment_not_configured
meaning: Endpoint temporarily disabled on this server, or its upstream is not configured. No 402 is issued.
retry: Check /status; retry later.
- status: 504
codes:
- upstream_unreachable
meaning: The upstream source timed out or was unreachable (Korean public data APIs have occasional outages, esp. holidays).
retry: Retry after 1-5 min with backoff.