get-protocol-summary

Get a concise explanation of what Crinkl is and how the protocol works. Use this first if you have no prior context about Crinkl. Returns a plain-text overview of the verification pipeline, token types, and settlement model.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-cumulative-gmv

Get cumulative Gross Merchandise Value (GMV) from the public cumulative feed. The live Crinkl site displays this live beta cumulative total on top of the finalized alpha base; provide startDate to bound the window explicitly. Returns a cryptographically signed token containing total USD cents, spend count, and computation timestamp.

Parameters2

startDate	string	optional	Optional ISO date (YYYY-MM-DD) to start counting from. The live beta cumulative feed uses 2026-01-27.
asOfDate	string	optional	Optional ISO date to compute GMV as of (defaults to now)

Raw schema

{
  "type": "object",
  "properties": {
    "startDate": {
      "type": "string",
      "description": "Optional ISO date (YYYY-MM-DD) to start counting from. The live beta cumulative feed uses 2026-01-27."
    },
    "asOfDate": {
      "type": "string",
      "description": "Optional ISO date to compute GMV as of (defaults to now)"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-daily-gmv

Get the signed GMV summary for a specific calendar date (UTC). Returns the verified spend count, total USD cents, and a cryptographic signature from the Crinkl authority. Each daily GMV token is independently verifiable using the issuer's Ed25519 public key.

Parameters1

date

string

required

UTC date in YYYY-MM-DD format

Raw schema

{
  "type": "object",
  "properties": {
    "date": {
      "type": "string",
      "description": "UTC date in YYYY-MM-DD format"
    }
  },
  "required": [
    "date"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-trailing-gmv

Get a rolling N-day GMV trend summary. Returns daily verified GMV figures for the trailing window, enabling trend analysis of verified commerce volume. Each day's figure is backed by individually signed spend attestation tokens.

Parameters1

days

number

optional

Number of trailing days (default 7, max 90)

Raw schema

{
  "type": "object",
  "properties": {
    "days": {
      "type": "number",
      "description": "Number of trailing days (default 7, max 90)"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-spend-signals

Get recent verified spend activity signals from the Crinkl network. Each signal represents a cryptographically attested receipt that has passed OCR extraction, store resolution, and hard verification. Signals include store name, category (e.g. Grocery & Supermarkets, Gas & Convenience), CBSA metro code, and spend amount — but no personally identifiable information. Use resolve-cbsa to convert CBSA codes to metro area names.

Parameters1

limit

number

optional

Number of recent signals to return (default 20, max 50)

Raw schema

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "number",
      "description": "Number of recent signals to return (default 20, max 50)"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

resolve-cbsa

Resolve a CBSA (Core Based Statistical Area) code to its metro area name. CBSA codes appear in spend signals and distribution data as 5-digit codes (e.g. '35620'). This tool converts them to human-readable names (e.g. '35620' → 'New York-Newark-Jersey City, NY-NJ'). Also handles non-metro codes like 'non-metro:US-TN'.

Parameters1

code

string

required

The CBSA code to resolve (e.g. '35620' or 'non-metro:US-TX')

Raw schema

{
  "type": "object",
  "properties": {
    "code": {
      "type": "string",
      "description": "The CBSA code to resolve (e.g. '35620' or 'non-metro:US-TX')"
    }
  },
  "required": [
    "code"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-merchant-summary

Get aggregated merchant and category distribution across all verified spends. Shows top store brands, category breakdown (grocery, restaurant, gas, etc.), and spend concentration metrics. All data is derived from cryptographically verified receipt attestations.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-spend-distribution

Get the geographic and category distribution of verified spends over a trailing window. Returns a breakdown by store category and CBSA (Core Based Statistical Area) metro code, enabling analysis of where and how verified commerce is distributed across the United States.

Parameters1

days

number

optional

Number of trailing days (default 7, max 90)

Raw schema

{
  "type": "object",
  "properties": {
    "days": {
      "type": "number",
      "description": "Number of trailing days (default 7, max 90)"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-settlement-summary

Get reward settlement statistics for supported reward rails. Returns the current BTC price used for reward calculations, sats-per-receipt rate, reported Lightning Network payouts, total sats claimed by users, and wallets with balance. This endpoint reports settlement metrics; it is not a chain-finality or payout-proof verifier.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-gmv-inclusion-proof

Get a Merkle inclusion proof that a specific spend is included in a daily GMV total. Returns the spend leaf hash, sibling hashes for the Merkle path, and the GMV root hash. This cryptographic proof allows anyone to independently verify that a spend was counted in the reported GMV without trusting the server.

Parameters1

spendId

string

required

The spend ID (UUID) to get an inclusion proof for

Raw schema

{
  "type": "object",
  "properties": {
    "spendId": {
      "type": "string",
      "description": "The spend ID (UUID) to get an inclusion proof for"
    }
  },
  "required": [
    "spendId"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

verify-reward-commitment

Verify a reward commitment token's cryptographic integrity. Checks that the reward Merkle tree is valid, the batch signature is authentic, and the reward amounts match the committed values. Reward commitments bind point/sat allocations to specific spends before payout, preventing retroactive manipulation.

Parameters1

token

object

required

The full reward commitment token JSON object to verify

Raw schema

{
  "type": "object",
  "properties": {
    "token": {
      "type": "object",
      "additionalProperties": {},
      "description": "The full reward commitment token JSON object to verify"
    }
  },
  "required": [
    "token"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

verify-issued-gmv

Verify a supplied spend/GMV artifact bundle. Accepts a spend attestation token, GMV token, GMV inclusion proof, and reward commitment token, then verifies: (1) spend token signature is valid, (2) GMV token signature is valid, (3) spend is in the GMV Merkle tree, (4) reward commitment is valid, (5) all spend IDs match across artifacts. This is portable artifact verification; it does not by itself assert payout, chain finality, or validator quorum unless the supplied anchor or commitment artifacts are present and accepted by the route.

Parameters5

spendToken	object	required	The spend attestation token
gmvToken	object	required	The observed GMV token for the spend's date
gmvInclusionProof	object	required	The Merkle inclusion proof
rewardCommitmentToken	object	required	The reward commitment token
batchAnchor	object	optional	Optional batch anchor artifact. When omitted, verification is portable artifact verification only.

Raw schema

{
  "type": "object",
  "properties": {
    "spendToken": {
      "type": "object",
      "additionalProperties": {},
      "description": "The spend attestation token"
    },
    "gmvToken": {
      "type": "object",
      "additionalProperties": {},
      "description": "The observed GMV token for the spend's date"
    },
    "gmvInclusionProof": {
      "type": "object",
      "additionalProperties": {},
      "description": "The Merkle inclusion proof"
    },
    "rewardCommitmentToken": {
      "type": "object",
      "additionalProperties": {},
      "description": "The reward commitment token"
    },
    "batchAnchor": {
      "type": "object",
      "additionalProperties": {},
      "description": "Optional batch anchor artifact. When omitted, verification is portable artifact verification only."
    }
  },
  "required": [
    "spendToken",
    "gmvToken",
    "gmvInclusionProof",
    "rewardCommitmentToken"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-recent-issued-proofs

Get recent gateway-issued artifact bundles for portable spend/GMV verification. Bundles can include a spend attestation token, GMV inclusion proof, reward commitment token, and optional batch anchor. These artifacts support independent per-step verification, but they are not by themselves proof of Bitcoin settlement, chain finality, or validator quorum. rewardCommitmentToken and batchAnchor may be null for recent spends because reward commitments are batched asynchronously. Check the 'steps' array and 'ok' field for per-step verification results.

Parameters1

limit

number

optional

Number of recent proofs to return (default 10, max 50)

Raw schema

{
  "type": "object",
  "properties": {
    "limit": {
      "type": "number",
      "description": "Number of recent proofs to return (default 10, max 50)"
    }
  },
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-issuer-keys

Get the Crinkl authority's Ed25519 public key used to sign all attestation tokens. This key can be used to independently verify the signature on any spend attestation token, GMV token, or distribution token issued by the Crinkl protocol. The key is returned in base64 format.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-reward-policy

Get the current Crinkl reward policy. Returns the active policy version, SHA-256 policy hash, reward parameters (referral bonuses, base points), category multipliers (grocery 1.5×, dining 1.5×, etc.), $CRINKL token holding tier multipliers, and the latest reserve checkpoint (BTC price, sats/receipt, coverage ratio). All values are deterministic — the policy hash covers the full parameter set. Updated daily.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-agent-capabilities

Get Crinkl's canonical external agent capability catalog. Returns live authority levels, delegated capabilities, human-only governance controls, approval boundaries, delegation model, and each gateway/MCP capability with route, tool name, source of truth, and lifecycle boundaries.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-vendors

Get the currently approved DKIM vendor domains exposed by the public agent endpoint. Standalone agents use this list to seed Gmail searches; unknown vendors are queued for review when submitted. No authentication required.

Parameters

No parameters.

Raw schema

{
  "type": "object",
  "properties": {},
  "$schema": "http://json-schema.org/draft-07/schema#"
}

pair-agent

Start the human-authorized agent pairing flow. Generates a 4-character code that a human approves in the Crinkl PWA to authorize the agent. Returns the code and expiration time (10 minutes). No authentication required.

Parameters1

deviceToken

string

required

A random 64-character hex string. Store this — needed to claim the API key.

Raw schema

{
  "type": "object",
  "properties": {
    "deviceToken": {
      "type": "string",
      "description": "A random 64-character hex string. Store this — needed to claim the API key."
    }
  },
  "required": [
    "deviceToken"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

claim-api-key

Poll for the API key after the human approves the pairing code in the Crinkl PWA. Returns 202 while pending, 200 with the API key once approved, 410 if expired. Poll every 5 seconds. No authentication required.

Parameters2

deviceToken	string	required	The same deviceToken used in pair-agent.
code	string	required	The 4-character pairing code returned by pair-agent.

Raw schema

{
  "type": "object",
  "properties": {
    "deviceToken": {
      "type": "string",
      "description": "The same deviceToken used in pair-agent."
    },
    "code": {
      "type": "string",
      "description": "The 4-character pairing code returned by pair-agent."
    }
  },
  "required": [
    "deviceToken",
    "code"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

verify-receipt

Preview DKIM verification of a billing email without creating a spend or earning sats. Returns extracted invoice data (vendor, amount, date, DKIM status). The full email is required because DKIM signatures are computed over the original RFC 2822 message bytes — the signature cannot be verified without them. The email is discarded after verification.

Parameters2

apiKey	string	required	Your Crinkl agent API key (crk_...).
eml	string	required	The raw billing email, base64-encoded. Required for DKIM signature verification.

Raw schema

{
  "type": "object",
  "properties": {
    "apiKey": {
      "type": "string",
      "description": "Your Crinkl agent API key (crk_...)."
    },
    "eml": {
      "type": "string",
      "description": "The raw billing email, base64-encoded. Required for DKIM signature verification."
    }
  },
  "required": [
    "apiKey",
    "eml"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

submit-receipt

Submit a DKIM-verified billing email to mint a spend token and earn sats. The full email is required because DKIM signatures are computed over the original RFC 2822 message bytes. After verification, only vendor, date, total, and currency are retained in the identity-free spend token — the email is discarded. Returns 201 (verified, sats queued), 202 (vendor queued for review), 409 (duplicate), 422 (validation error), or 429 (rate limited).

Parameters2

apiKey	string	required	Your Crinkl agent API key (crk_...).
eml	string	required	The raw billing email, base64-encoded. Required for DKIM signature verification.

Raw schema

{
  "type": "object",
  "properties": {
    "apiKey": {
      "type": "string",
      "description": "Your Crinkl agent API key (crk_...)."
    },
    "eml": {
      "type": "string",
      "description": "The raw billing email, base64-encoded. Required for DKIM signature verification."
    }
  },
  "required": [
    "apiKey",
    "eml"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

get-agent-me

Get your agent's submission count, earned sats, and wallet-level stats. Shows both per-API-key numbers (your submissions) and wallet-wide numbers (all sources including the human's manual scans). Returns satsPerReceipt (current rate).

Parameters1

apiKey

string

required

Your Crinkl agent API key (crk_...).

Raw schema

{
  "type": "object",
  "properties": {
    "apiKey": {
      "type": "string",
      "description": "Your Crinkl agent API key (crk_...)."
    }
  },
  "required": [
    "apiKey"
  ],
  "additionalProperties": false,
  "$schema": "http://json-schema.org/draft-07/schema#"
}

Crinkl Commerce MCP

🛠️ Key Features

🚀 Use Cases

⚡ Developer Benefits

⚠️ Limitations

get-protocol-summary

get-cumulative-gmv

get-daily-gmv

get-trailing-gmv

get-spend-signals

resolve-cbsa

get-merchant-summary

get-spend-distribution

get-settlement-summary

get-gmv-inclusion-proof

verify-reward-commitment

verify-issued-gmv

get-recent-issued-proofs

get-issuer-keys

get-reward-policy

get-agent-capabilities

get-vendors

pair-agent

claim-api-key

verify-receipt

submit-receipt

get-agent-me

Install

Remote endpoint

Related servers