Sign an x402 payment authorization (BETA)
curl --request POST \
--url https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures \
--header 'Content-Type: application/json' \
--header 'x-api-key: <api-key>' \
--header 'x-idempotency-key: <x-idempotency-key>' \
--data '
{
"resource_url": "https://api.marketpulse.example/v1/reports/copper-spot",
"payment_requirements": {
"scheme": "exact",
"network": "base-sepolia",
"maxAmountRequired": "100000",
"resource": "https://api.marketpulse.example/v1/reports/copper-spot",
"payTo": "0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F",
"asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USDC",
"version": "2"
}
}
}
'const options = {
method: 'POST',
headers: {
'x-idempotency-key': '<x-idempotency-key>',
'x-api-key': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
resource_url: 'https://api.marketpulse.example/v1/reports/copper-spot',
payment_requirements: {
scheme: 'exact',
network: 'base-sepolia',
maxAmountRequired: '100000',
resource: 'https://api.marketpulse.example/v1/reports/copper-spot',
payTo: '0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F',
asset: '0x036CbD53842c5426634e7929541eC2318f3dCF7e',
maxTimeoutSeconds: 120,
extra: {name: 'USDC', version: '2'}
}
})
};
fetch('https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures"
payload = {
"resource_url": "https://api.marketpulse.example/v1/reports/copper-spot",
"payment_requirements": {
"scheme": "exact",
"network": "base-sepolia",
"maxAmountRequired": "100000",
"resource": "https://api.marketpulse.example/v1/reports/copper-spot",
"payTo": "0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F",
"asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USDC",
"version": "2"
}
}
}
headers = {
"x-idempotency-key": "<x-idempotency-key>",
"x-api-key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures"
payload := strings.NewReader("{\n \"resource_url\": \"https://api.marketpulse.example/v1/reports/copper-spot\",\n \"payment_requirements\": {\n \"scheme\": \"exact\",\n \"network\": \"base-sepolia\",\n \"maxAmountRequired\": \"100000\",\n \"resource\": \"https://api.marketpulse.example/v1/reports/copper-spot\",\n \"payTo\": \"0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F\",\n \"asset\": \"0x036CbD53842c5426634e7929541eC2318f3dCF7e\",\n \"maxTimeoutSeconds\": 120,\n \"extra\": {\n \"name\": \"USDC\",\n \"version\": \"2\"\n }\n }\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-idempotency-key", "<x-idempotency-key>")
req.Header.Add("x-api-key", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}{
"payment_header": "eyJ4NDAyVmVyc2lvbiI6MSwic2NoZW1lIjoiZXhhY3QiLCJuZXR3b3JrIjoiYmFzZS1zZXBvbGlhIn0",
"payment_header_name": "X-PAYMENT",
"signature": "0x9f2b1c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b1c001c",
"authorization_id": "2vWxX402Hold000000000000001",
"mandate_id": "2vWxX402Mandate000000000001",
"payer": "0x8f2A55949038A9610F50FB23B5883Af3B4ecB3a1",
"pay_to": "0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F",
"value": "100000",
"nonce": "0x3f1c8a5b2d7e4906c1a3f85b2e6d04971c8a5b3f2d7e4906c1a3f85b2e6d0497",
"valid_before": "2026-09-08T00:02:00Z",
"window_committed": "100000"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}Agentic Payments
Sign an x402 payment authorization (BETA)
Beta — early access.
Returns the X-PAYMENT header for a seller’s 402 challenge, signed by the agent’s Dakota-custodied wallet. The caller never holds a key.
Supported asset: USDC only, on Base (base / eip155:8453) and Base Sepolia (base-sepolia / eip155:84532). A seller pricing in any other token, or on any other network, is refused with a 403 naming the supported set; no signature is issued and no budget is held.
Issuing this signature IS spending money: it is an EIP-3009 TransferWithAuthorization that any holder can settle on-chain until validBefore passes, with no further approval from us. So both controls run here, before any signature exists: the seller’s payTo is screened for sanctions and other high-risk activity, and the agent’s x402 mandate is evaluated together with a hold recorded against its budget, atomically.
A refusal is a 403 naming the reason. If the payee cannot be screened the payment is refused with a 503, never signed unscreened; retry it.
Idempotent per X-Idempotency-Key: a retry with the same key and the same payment returns the SAME authorization (same nonce, same validity window), signed again - never a second one - so at most one can settle. The response is never cached: the signed header is a bearer instrument.
POST
/
payment-agents
/
{payment_agent_id}
/
x402
/
signatures
Sign an x402 payment authorization (BETA)
curl --request POST \
--url https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures \
--header 'Content-Type: application/json' \
--header 'x-api-key: <api-key>' \
--header 'x-idempotency-key: <x-idempotency-key>' \
--data '
{
"resource_url": "https://api.marketpulse.example/v1/reports/copper-spot",
"payment_requirements": {
"scheme": "exact",
"network": "base-sepolia",
"maxAmountRequired": "100000",
"resource": "https://api.marketpulse.example/v1/reports/copper-spot",
"payTo": "0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F",
"asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USDC",
"version": "2"
}
}
}
'const options = {
method: 'POST',
headers: {
'x-idempotency-key': '<x-idempotency-key>',
'x-api-key': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({
resource_url: 'https://api.marketpulse.example/v1/reports/copper-spot',
payment_requirements: {
scheme: 'exact',
network: 'base-sepolia',
maxAmountRequired: '100000',
resource: 'https://api.marketpulse.example/v1/reports/copper-spot',
payTo: '0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F',
asset: '0x036CbD53842c5426634e7929541eC2318f3dCF7e',
maxTimeoutSeconds: 120,
extra: {name: 'USDC', version: '2'}
}
})
};
fetch('https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures', options)
.then(res => res.json())
.then(res => console.log(res))
.catch(err => console.error(err));import requests
url = "https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures"
payload = {
"resource_url": "https://api.marketpulse.example/v1/reports/copper-spot",
"payment_requirements": {
"scheme": "exact",
"network": "base-sepolia",
"maxAmountRequired": "100000",
"resource": "https://api.marketpulse.example/v1/reports/copper-spot",
"payTo": "0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F",
"asset": "0x036CbD53842c5426634e7929541eC2318f3dCF7e",
"maxTimeoutSeconds": 120,
"extra": {
"name": "USDC",
"version": "2"
}
}
}
headers = {
"x-idempotency-key": "<x-idempotency-key>",
"x-api-key": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)package main
import (
"fmt"
"strings"
"net/http"
"io"
)
func main() {
url := "https://api.platform.dakota.xyz/payment-agents/{payment_agent_id}/x402/signatures"
payload := strings.NewReader("{\n \"resource_url\": \"https://api.marketpulse.example/v1/reports/copper-spot\",\n \"payment_requirements\": {\n \"scheme\": \"exact\",\n \"network\": \"base-sepolia\",\n \"maxAmountRequired\": \"100000\",\n \"resource\": \"https://api.marketpulse.example/v1/reports/copper-spot\",\n \"payTo\": \"0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F\",\n \"asset\": \"0x036CbD53842c5426634e7929541eC2318f3dCF7e\",\n \"maxTimeoutSeconds\": 120,\n \"extra\": {\n \"name\": \"USDC\",\n \"version\": \"2\"\n }\n }\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("x-idempotency-key", "<x-idempotency-key>")
req.Header.Add("x-api-key", "<api-key>")
req.Header.Add("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}{
"payment_header": "eyJ4NDAyVmVyc2lvbiI6MSwic2NoZW1lIjoiZXhhY3QiLCJuZXR3b3JrIjoiYmFzZS1zZXBvbGlhIn0",
"payment_header_name": "X-PAYMENT",
"signature": "0x9f2b1c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e0f1a2b1c001c",
"authorization_id": "2vWxX402Hold000000000000001",
"mandate_id": "2vWxX402Mandate000000000001",
"payer": "0x8f2A55949038A9610F50FB23B5883Af3B4ecB3a1",
"pay_to": "0x94aE0f8B9F3c2A1d5E6b7C8D9e0F1a2B3c4D5E6F",
"value": "100000",
"nonce": "0x3f1c8a5b2d7e4906c1a3f85b2e6d04971c8a5b3f2d7e4906c1a3f85b2e6d0497",
"valid_before": "2026-09-08T00:02:00Z",
"window_committed": "100000"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}{
"type": "https://docs.dakota.xyz/api-reference/errors#not-found",
"title": "Customer Not Found",
"status": 404,
"detail": "Customer cst_2abc123 was not found in your organization.",
"instance": "https://api.platform.dakota.xyz/customers/cst_2abc123",
"request_id": "req_7f3a8b2c"
}Authorizations
Headers
Unique key to ensure request idempotency. If the same key is used within a certain time window, the original response will be returned instead of executing the request again.
Path Parameters
Body
application/json
One payment option from a seller's 402 response, forwarded verbatim. Field names are the x402 protocol's own, not Dakota's. Both protocol versions are accepted: v1 terms carry maxAmountRequired, v2 terms carry amount and a CAIP-2 network.
Show child attributes
Show child attributes
The 402-metered URL being paid for. Required when the mandate restricts payees by domain.
The x402 version the seller spoke — x402Version in its 402 response. Decides how the signed payment is packaged: v1 as the X-PAYMENT header, v2 as PAYMENT-SIGNATURE. Defaults to 1.
Available options:
1, 2 Response
The signed payment authorization
The payment header's value — base64 of the payment payload — to send in the header named by payment_header_name.
The request header the seller expects the payment in: X-PAYMENT for x402 v1, PAYMENT-SIGNATURE for v2.
Available options:
X-PAYMENT, PAYMENT-SIGNATURE The hold this authorization is recorded against.
Committed spend in the mandate's window after this authorization.
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