x402 Carbon Retirement API
Entry point to the x402 Carbon Retirement API on Base. Returns every endpoint you need plus a live snapshot of the top 3 carbon classes and marketplace listings by liquidity. Discover, quote and certificate are free. Retiring is paid: each retirement costs the credit price plus a fee, sent from your own wallet (prepare/retire) or relayed from a signed USDC authorization (prepare-auth + POST actions/retire). Full spec at /openapi.json.
TradingLiveeip155:8453Exactvia cdp
CarbonClimateBase
Calls · 30d
3
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 8 snapshots so far.
$0.005
Verified settled volume
5 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0010
Listed price
As published in the catalog. Always read the live 402 before paying.
3
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-09-19 15:57Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xf624f9Fe1D3165c5Ca32c7Fbdbf82f4a5b1D2d0eThe wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.001USDC≈ $0.001 USD
on Base · exact scheme
Pay 0.001 USDC on Base to 0xf624…D2d0e. The signed payment is good for 5 minutes.
- Paid to
- 0xf624…D2d0e
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 1000 smallest units
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0xf624f9Fe1D3165c5Ca32c7Fbdbf82f4a5b1D2d0e",
"amount": "1000",
"scheme": "exact",
"network": "eip155:8453",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"type": "http",
"method": "GET",
"queryParams": {}
},
"output": {
"type": "json",
"example": {
"asOf": "2026-09-15T00:00:00.000Z",
"classes": [
{
"name": "Wind Energy - Small Scale",
"country": "India",
"category": "Wind Energy",
"priceBasis": "indicative",
"creditCount": 6,
"carbonClassId": "0x0008f35758a4318942ecb5d5414116ce7b1ede2d",
"liquidityTonnes": "228436",
"priceUsdcPerTonne": "40352",
"priceUsdcPerTonneFormatted": "0.040352"
},
{
"name": "Solar PV - Small Scale",
"country": "India",
"category": "Solar Energy",
"priceBasis": "indicative",
"creditCount": 13,
"carbonClassId": "0x1ff9bd464155d32fd2f9d302008d38544c0ae371",
"liquidityTonnes": "76646",
"priceUsdcPerTonne": "16412",
"priceUsdcPerTonneFormatted": "0.016412"
},
{
"name": "Regen Network - City Forest Credits",
"country": "United States",
"category": "City Forest Credits",
"priceBasis": "indicative",
"creditCount": 3,
"carbonClassId": "0xf4699531e0a5f6e9351a36de3753deaad329bf45",
"liquidityTonnes": "6919",
"priceUsdcPerTonne": "4449127",
"priceUsdcPerTonneFormatted": "4.449127"
}
],
"listings": [
{
"country": "Brazil",
"vintage": 2011,
"category": "Renewable Energy",
"creditId": "VCS-896-2011",
"registry": "VCS",
"expiresAt": "2031-08-16T20:51:26.000Z",
"listingId": "0x06ae1ad6472fe406bfc6ec9d20f0060a90ae4911ba482f93fa4a6dceab5e40ca",
"priceBasis": "firm",
"projectName": "Foz Do Chapecó Project",
"minFillTonnes": "0.001",
"leftToSellTonnes": "367811.2",
"priceUsdcPerTonne": "410000",
"priceUsdcPerTonneFormatted": "0.41"
},
{
"country": "South Korea",
"vintage": 2015,
"category": "Energy Efficiency",
"creditId": "VCS-1146-2015",
"registry": "VCS",
"expiresAt": "2031-09-03T13:48:30.000Z",
"listingId": "0xea39b91a16003213b195a75476ea8277df1754309074437c9be72ae714ed1100",
"priceBasis": "firm",
"projectName": "The Hyundai Waste Energy Recovery Co-Generation Project Phase II",
"minFillTonnes": "0.001",
"leftToSellTonnes": "298147",
"priceUsdcPerTonne": "730000",
"priceUsdcPerTonneFormatted": "0.73"
},
{
"country": "China",
"vintage": 2016,
"category": "Renewable Energy",
"creditId": "VCS-850-2016",
"registry": "VCS",
"expiresAt": "2031-08-16T14:22:45.000Z",
"listingId": "0xd33885ac05bd66888963bab0b6b32248bcdc0501ce8152bafc854059b86d12e3",
"priceBasis": "firm",
"projectName": "Inner Mongolia Jingneng Saihan Wind Farm Phase I Project",
"minFillTonnes": "0.001",
"leftToSellTonnes": "74959",
"priceUsdcPerTonne": "520000",
"priceUsdcPerTonneFormatted": "0.52"
}
],
"endpoints": {
"note": "Start here: every carbon retirement goes through these endpoints. discover, quote and certificate are free. Retiring is paid: each retirement costs the credit price plus a fee (and executor gas when relayed through actions/retire), sent from your own wallet via prepare/retire or authorized by signature via prepare-auth. Full request and response schemas: https://x402.klimalabs.com/openapi.json",
"quote": {
"url": "https://x402.klimalabs.com/api/quote",
"method": "GET"
},
"openapi": {
"url": "https://x402.klimalabs.com/openapi.json",
"method": "GET"
},
"discover": {
"url": "https://x402.klimalabs.com/api/discover",
"method": "GET"
},
"manifest": {
"url": "https://x402.klimalabs.com/.well-known/x402.json",
"method": "GET"
},
"certificate": {
"url": "https://x402.klimalabs.com/api/certificate",
"method": "GET"
},
"prepareAuth": {
"url": "https://x402.klimalabs.com/api/prepare-auth",
"method": "GET"
},
"actionsRetire": {
"url": "https://x402.klimalabs.com/api/actions/retire",
"method": "POST"
},
"prepareRetire": {
"url": "https://x402.klimalabs.com/api/prepare/retire",
"method": "GET"
}
},
"catalogNote": "Prices are USDC per tonne before the fee. Class prices are indicative live quotes; listing prices are the seller's firm ask. To retire: GET quote, then either GET prepare/retire and send the transactions from your own wallet, or GET prepare-auth, sign its typedData and POST actions/retire. Either way the retirement costs the credit price plus a fee. GET discover returns the full catalog for free."
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method"
],
"properties": {
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"GET"
],
"type": "string"
},
"queryParams": {
"type": "object",
"properties": {},
"additionalProperties": false
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object",
"required": [
"asOf",
"endpoints",
"classes",
"listings",
"catalogNote"
],
"properties": {
"asOf": {
"type": "string"
},
"classes": {
"type": "array",
"items": {
"type": "object",
"required": [
"carbonClassId",
"name",
"category",
"country",
"priceUsdcPerTonne",
"priceUsdcPerTonneFormatted",
"priceBasis",
"liquidityTonnes",
"creditCount"
],
"properties": {
"name": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"country": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"category": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"priceBasis": {
"type": "string",
"const": "indicative"
},
"creditCount": {
"type": "number"
},
"carbonClassId": {
"type": "string"
},
"liquidityTonnes": {
"type": "string"
},
"priceUsdcPerTonne": {
"type": "string"
},
"priceUsdcPerTonneFormatted": {
"type": "string"
}
},
"additionalProperties": false
}
},
"listings": {
"type": "array",
"items": {
"type": "object",
"required": [
"listingId",
"projectName",
"creditId",
"registry",
"vintage",
"country",
"category",
"priceUsdcPerTonne",
"priceUsdcPerTonneFormatted",
"priceBasis",
"leftToSellTonnes",
"minFillTonnes",
"expiresAt"
],
"properties": {
"country": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"vintage": {
"anyOf": [
{
"type": "number"
},
{
"type": "null"
}
]
},
"category": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"creditId": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"registry": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"expiresAt": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"listingId": {
"type": "string"
},
"priceBasis": {
"type": "string",
"const": "firm"
},
"projectName": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"minFillTonnes": {
"type": "string"
},
"leftToSellTonnes": {
"type": "string"
},
"priceUsdcPerTonne": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
},
"priceUsdcPerTonneFormatted": {
"anyOf": [
{
"type": "string"
},
{
"type": "null"
}
]
}
},
"additionalProperties": false
}
},
"endpoints": {
"type": "object",
"required": [
"note",
"discover",
"quote",
"prepareRetire",
"prepareAuth",
"actionsRetire",
"certificate",
"openapi",
"manifest"
],
"properties": {
"note": {
"type": "string"
},
"quote": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
},
"openapi": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
},
"discover": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
},
"manifest": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
},
"certificate": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
},
"prepareAuth": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
},
"actionsRetire": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
},
"prepareRetire": {
"type": "object",
"required": [
"url",
"method"
],
"properties": {
"url": {
"type": "string"
},
"method": {
"enum": [
"GET",
"POST"
],
"type": "string"
}
},
"additionalProperties": false
}
},
"additionalProperties": false
},
"catalogNote": {
"type": "string"
}
},
"additionalProperties": false
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-24 07:32Z
- Last indexed by Roundhouse
- 2026-09-24 10:40Z
- Last enriched (probe, favicon, geo)
- 2026-09-16 19:45Z
- x402 version
- 2
- Max timeout
- 300s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 8 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service x402 Carbon Retirement API and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=x402%20Carbon%20Retirement%20API' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://x402.klimalabs.com/api/catalog, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.