`weft-sdk` for Python

The supported Python buyer client for Weft. Generated OpenAPI APIs remain available under weft_sdk.generated as an advanced escape hatch.

Install and authenticate

Create a buyer wk_* key in Dashboard → API keys, then:

pip install weft-sdk
export WEFT_API_KEY="wk_..."

Search

import os

from weft_sdk import Client

api_key = os.environ["WEFT_API_KEY"]
with Client(api_key=api_key) as weft:
    account = weft.me()
    results = weft.search(query="weather data API", max_results=5)

print(account.data)
print(results.results)

The client defaults to https://weft.network.

Bounded paid fetch

Paid fetches require both a maximum cost and an idempotency key. Reuse the key when retrying the same logical purchase after an uncertain response.

from uuid import uuid4

idempotency_key = str(uuid4())
artifact = weft.fetch(
    url="https://merchant.example/data",
    max_cost_usd="0.05",
    idempotency_key=idempotency_key,
)

Handle API errors

All buyer-client methods raise the same WeftError shape, including the HTTP status, stable error code, request ID, retry hint, and structured details.

from weft_sdk import WeftError

try:
    results = weft.search(query="weather data API")
except WeftError as error:
    print(error.status, error.code, error.request_id, error.retryable)
    print(error.details)
    raise

401: confirm that WEFT_API_KEY contains a current buyer wk_* key.
403: inspect code and details for an insufficient balance or spending policy denial before changing the request.
409 (IDEMPOTENCY_CONFLICT): this buyer already used the supplied idempotency key for a different fetch request. Generate a new key for the new operation; the original operation retries unchanged with its own key. retryable is False — resending the conflicting request will conflict again.
429: honor Retry-After and back off.
5xx: retry transient failures with backoff; reuse the idempotency key for a paid fetch.
status == 0 (NETWORK_ERROR): the request failed before any Weft response, so the outcome is uncertain. retryable is True; retry with backoff and reuse the idempotency key for a paid fetch.

See the API reference for the complete contract.

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