v18 (retired)

Status

Retired August 11, 2026

Summary

This stable release streamlines the API around seller listing based orders, unifies retirement IDs across chains, and adds read-only retirement query support on Base. It removes legacy carbon pools and product order types to simplify integration going forward.

Release notes

General

• Removed support for carbon pool and product orders - the API now exclusively supports seller listing based orders.

• Updated retirement endpoints to use a unified retirement ID format that works across chains.

• Introduced support for Base network chain read only retirement queries (no support for performing retirements yet).

Endpoints updated

GET /retirements

• Now searches both Polygon and Base chain retirements, returning results from both chains.

GET /retirements/:beneficiaryAddress/:retirementIndex

• [⚠️ BREAKING CHANGE] This endpoint has been replaced by GET /retirements/:id. The new endpoint uses a unified retirement ID format (e.g., 84532-0x1ee2facc42147cc6f6cd1fcdca4e3748d2b41b089fafac46515318bbce4f633c-0) that works across chains. See Endpoints added for more info.

GET /retirements/:beneficiaryAddress/:retirementIndex/certificate

• [⚠️ BREAKING CHANGE] This endpoint has been replaced by GET /retirements/:id/certificate. See Endpoints added for more info.

GET /retirements/:beneficiaryAddress/:retirementIndex/provenance

• [⚠️ BREAKING CHANGE] This endpoint has been replaced by GET /retirements/:id/provenance. See Endpoints added for more info.

GET /prices

• [⚠️ BREAKING CHANGE] Removed the following query parameters:

  • productIds - Products are no longer supported

  • hasAssetPriceType - Only listing prices are now returned

  • isDefaultCredit - Carbon pools are no longer supported

• The endpoint now exclusively returns prices from listing created by sellers.

POST /quotes

• [⚠️ BREAKING CHANGE] Simplified request body - now only accepts asset_price_source_id and quantity_tonnes .

• Removed deprecated parameters: listing_id, pool, credit_token_address .

• Removed support for carbon pool and product quotes - only listing quotes are supported.

POST /orders

• [⚠️ BREAKING CHANGE] Now only supports listing orders. Carbon pool and product orders are no longer supported.

• Requests with non-listing asset_price_source_id values will return a 400 error.

GET /carbonProjects

• Updated to return only listing prices.

Endpoints added

GET /retirements/:id

• Get retirement details using a unified retirement ID format that works across Polygon and Base chains.

• The retirement ID format is: {chainId}-{transactionHash}-{retirementIndex} (e.g., 84532-0x1ee2facc42147cc6f6cd1fcdca4e3748d2b41b089fafac46515318bbce4f633c-0).

• This replaces the previous /retirements/:beneficiaryAddress/:retirementIndex endpoint.

GET /retirements/:id/certificate

• Get retirement certificate using a unified retirement ID.

• This replaces the previous /retirements/:beneficiaryAddress/:retirementIndex/certificate endpoint.

GET /retirements/:id/provenance

• Get retirement provenance records using a unified retirement ID.

• This replaces the previous /retirements/:beneficiaryAddress/:retirementIndex/provenance endpoint.

Endpoints removed

GET /products

• [⚠️ BREAKING CHANGE] This endpoint has been removed. Products are no longer supported.

GET /products/:id

• [⚠️ BREAKING CHANGE] This endpoint has been removed. Products are no longer supported.

GET /products/:id/stats

• [⚠️ BREAKING CHANGE] This endpoint has been removed. Products are no longer supported.

Migration Path

• Products endpoints

  • If you were using GET /products, GET /products/:id, or GET /products/:id/stats, these endpoints have been removed. Products are no longer supported as a retirement source. You should use listing-based orders instead.

• Retirement endpoints

  • If you were using GET /retirements/:beneficiaryAddress/:retirementIndex, you should now use GET /retirements/:id .

  • If you were using GET /retirements/:beneficiaryAddress/:retirementIndex/certificate, you should now use GET /retirements/:id/certificate .

  • If you were using GET /retirements/:beneficiaryAddress/:retirementIndex/provenance, you should now use GET /retirements/:id/provenance .

  • The retirement ID can be obtained from the GET /retirements endpoint, which returns retirements with their IDs.

• Prices endpoint

  • If you were filtering by productIds, hasAssetPriceType, or isDefaultCredit, these parameters have been removed. The endpoint now only returns listing prices.

• Quotes endpoint

  • If you were using deprecated parameters like listing_id, pool, or credit_token_address, you should now use asset_price_source_id .

  • Carbon pool and product quotes are no longer supported - only listing quotes are available.