17 district registers, recorded prices and 2,159 transactions, free as JSON and CSV.
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Everything on this site that comes from a district register or a recorded transaction is downloadable, free, as plain JSON or CSV. Use it in a permit application, an appraisal, a feasibility study or your own tools; please cite the Exchange and the district source each record names. The files are rebuilt whenever a register or the transaction record changes.
| What | File |
|---|---|
| Every district: register edition and check date, certificates, holders, banked tons per year | districts.json |
| Recorded prices by district, pollutant and year, with the reference-value inputs | prices.json |
| Each district’s offset rule: thresholds, ratios and what is offset, with the rule section for each | offset-rules.json |
| Recorded transactions, each with its source document | transactions.json · CSV |
| Changes on each district register between editions: certificates added, transferred, changed or gone | changes.json · RSS |
| Every certificate in the Antelope Valley AQMD register | AVAQMD.json · CSV |
| Every certificate in the Bay Area AQMD register | BAAQMD.json · CSV |
| Every certificate in the Butte County AQMD register | BCAQMD.json · CSV |
| Every certificate in the Eastern Kern APCD register | EKAPCD.json · CSV |
| Every certificate in the Feather River AQMD register | FRAQMD.json · CSV |
| Every certificate in the Imperial County APCD register | ICAPCD.json · CSV |
| Every certificate in the Monterey Bay ARD register | MBARD.json · CSV |
| Every certificate in the Mojave Desert AQMD register | MDAQMD.json · CSV |
| Every certificate in the North Coast Unified AQMD register | NCUAQMD.json · CSV |
| Every certificate in the Santa Barbara County APCD register | SBCAPCD.json · CSV |
| Every certificate in the South Coast AQMD register | SCAQMD.json · CSV |
| Every certificate in the San Diego County APCD register | SDAPCD.json · CSV |
| Every certificate in the San Joaquin Valley APCD register | SJVAPCD.json · CSV |
| Every certificate in the Sacramento Metro AQMD register | SMAQMD.json · CSV |
| Every certificate in the Tehama County APCD register | TCAPCD.json · CSV |
| Every certificate in the Ventura County APCD register | VCAPCD.json · CSV |
| Every certificate in the Yolo-Solano AQMD register | YSAQMD.json · CSV |
GET /api/data returns the credits listed for sale; GET /api/wants the buyers' wants on the board; GET /api/transactions trades closed on the Exchange (with a price only where both parties agreed to publish it). JSON, no key needed. Please keep it to a request a minute.
Two small widgets any site can embed, with the district's recorded prices or the credits for sale there. Replace the district in the address with any district's from its guide.
<iframe src="https://calercexchange.com/embed/price/san-joaquin-valley-apcd/" width="360" height="260" style="border:0" title="ERC prices"></iframe> <iframe src="https://calercexchange.com/embed/for-sale/feather-river-aqmd/" width="360" height="220" style="border:0" title="ERCs for sale"></iframe>
Holder names and certificate numbers are public district records. The Exchange never publishes holder contact details, and the files don't contain them. Figures are as the districts and reports printed them; check the district's own record before relying on one. Nothing here is investment, legal or engineering advice.
Every file includes an attribution field and its generation date. Questions or corrections: calercexchange@gmail.com.