> ## Documentation Index > Fetch the complete documentation index at: https://docs.api.vcm.fyi/llms.txt > Use this file to discover all available pages before exploring further. # Credit volumes by transaction date for a project > Get credit quantities binned by transaction date for a specific project. Returns time-series data for building credit activity charts on project detail pages. Includes all transaction types (issuances, retirements, cancellations) summed by period. **Frequency:** `D` (daily), `W` (weekly), `M` (monthly), `Y` (yearly). Default: `Y`. **Filters:** Supports credit filters (transaction_type, vintage, date range) and beneficiary search. ## OpenAPI ````yaml https://api.vcm.fyi/v1/openapi.json get /v1/charts/credits_by_transaction_date/{project_id} openapi: 3.1.0 info: title: VCM.fyi API version: 1.0.0 description: > # VCM.fyi API Programmatic access to carbon market intelligence — covering 11,000+ carbon credit projects across 6 major registries (Verra, Gold Standard, CAR, ACR, Isometric, Puro Earth). ## Resources | Resource | Description | |---|---| | **Projects** | Search, filter, and retrieve carbon credit project metadata | | **Credits** | Individual credit transactions (issuances, retirements, cancellations) | | **Buyers** | Aggregated buyer intelligence from retirement transaction data | | **Charts** | Pre-aggregated chart data for visualizations | | **Countries** | Country-level carbon market policy intelligence (Article 6, CORSIA, carbon pricing) | | **Forensics** | AI-generated project risk analysis from weekly news scanning | | **Proponent Forensics** | Developer/proponent-level risk ratings and due diligence | | **Satellite** | Forest integrity and deforestation metrics | | **Supply & Demand** | Aggregated issuance vs. retirement volumes over time | | **API Keys** | Manage your API keys and view usage statistics | ## Authentication All endpoints require an API key passed in the `X-API-KEY` header: ```bash curl -H "X-API-KEY: vcm_live_your_key_here" https://api.vcm.fyi/v1/projects/ ``` Get your API key at [app.vcm.fyi/settings/api](https://app.vcm.fyi/settings/api). ## Rate Limits | Plan | Requests/min | Monthly Calls | |------|-------------|---------------| | Pro | 300 | 100,000 | | Enterprise | 1,000 | Unlimited | Rate limit headers are included in every response: - `X-RateLimit-Limit` — Your limit per minute - `X-RateLimit-Remaining` — Remaining requests in current window - `X-RateLimit-Reset` — Unix timestamp when the window resets ## Pagination List endpoints return paginated results: ```json { "pagination": { "total_entries": 11234, "current_page": 1, "total_pages": 113, "next_page": "/v1/projects/?current_page=2&per_page=100" }, "data": [...] } ``` contact: name: VCM.fyi Support email: support@vcm.fyi url: https://vcm.fyi termsOfService: https://vcm.fyi/terms x-logo: url: https://app.vcm.fyi/logo.svg altText: VCM.fyi servers: - url: https://vcm-fyi-api.fly.dev description: Production security: [] tags: - name: API Keys description: Create, list, revoke your API keys and view usage statistics. - name: Buyers description: >- Aggregated buyer intelligence derived from retirement transactions. Includes volume metrics, activity flags, category/country breakdowns, and analytics. - name: Charts description: >- Pre-aggregated chart data for visualizations: projects by listing date, credits by transaction date, category breakdowns, credit histograms, and top buyers. - name: Countries description: >- Country-level carbon market policy intelligence covering Article 6 status, CORSIA eligibility, carbon pricing, VCM regulation, and AI-generated policy summaries. - name: Credits description: >- Query individual credit transactions — issuances, retirements, and cancellations — with quantity, vintage, date, and beneficiary details. - name: Forensics description: >- AI-generated project risk analysis from weekly scanning of 100+ news sources. Includes entries, memos, weekly diffs, and legacy v1 endpoints. - name: Projects description: >- Search, filter, and retrieve metadata for 11,000+ carbon credit projects across Verra, Gold Standard, CAR, ACR, Isometric, and Puro Earth. - name: Proponent Forensics description: >- Developer/proponent-level risk ratings and due diligence analysis with governance, financial, legal, social, and institutional risk pillar scores. - name: Satellite description: >- Forest integrity and deforestation metrics from Global Forest Watch, including tree cover loss, GLAD alerts, fire alerts, and project boundary GeoJSON. - name: Supply & Demand description: >- Aggregated issuance (supply) vs. retirement (demand) volumes over time, with monthly, quarterly, or yearly aggregation. paths: /v1/charts/credits_by_transaction_date/{project_id}: get: tags: - Charts summary: Credit volumes by transaction date for a project description: |- Get credit quantities binned by transaction date for a specific project. Returns time-series data for building credit activity charts on project detail pages. Includes all transaction types (issuances, retirements, cancellations) summed by period. **Frequency:** `D` (daily), `W` (weekly), `M` (monthly), `Y` (yearly). Default: `Y`. **Filters:** Supports credit filters (transaction_type, vintage, date range) and beneficiary search. operationId: >- get_credits_by_project_id_v1_charts_credits_by_transaction_date__project_id__get parameters: - name: project_id in: path required: true schema: type: string title: Project Id - name: freq in: query required: false schema: enum: - D - W - M - 'Y' type: string description: Frequency of bins default: 'Y' title: Freq description: Frequency of bins - name: current_page in: query required: false schema: type: integer minimum: 1 description: Page number default: 1 title: Current Page description: Page number - name: per_page in: query required: false schema: type: integer maximum: 200 minimum: 1 description: Items per page default: 100 title: Per Page description: Items per page - name: transaction_type in: query required: false schema: anyOf: - items: type: string type: array - type: 'null' description: Transaction type title: Transaction Type description: Transaction type - name: vintage in: query required: false schema: anyOf: - items: type: integer type: array - type: 'null' description: Vintage title: Vintage description: Vintage - name: transaction_date_from in: query required: false schema: anyOf: - type: string format: date-time - type: string format: date - type: 'null' description: 'Format: YYYY-MM-DD' title: Transaction Date From description: 'Format: YYYY-MM-DD' - name: transaction_date_to in: query required: false schema: anyOf: - type: string format: date-time - type: string format: date - type: 'null' description: 'Format: YYYY-MM-DD' title: Transaction Date To description: 'Format: YYYY-MM-DD' - name: quantity_min in: query required: false schema: anyOf: - type: integer - type: 'null' description: Minimum transaction quantity title: Quantity Min description: Minimum transaction quantity - name: quantity_max in: query required: false schema: anyOf: - type: integer - type: 'null' description: Maximum transaction quantity title: Quantity Max description: Maximum transaction quantity - name: beneficiary_search in: query required: false schema: anyOf: - type: string - type: 'null' description: >- Case insensitive search string. Currently searches on specified beneficiary_search_fields only. title: Beneficiary Search description: >- Case insensitive search string. Currently searches on specified beneficiary_search_fields only. - name: beneficiary_search_fields in: query required: false schema: type: array items: type: string description: >- Beneficiary fields to search in. Valid fields are: `retirement_beneficiary_harmonized`, `retirement_beneficiary`, `retirement_beneficiary_account`, `retirement_beneficiary_note`, `retirement_beneficiary_reason` default: - retirement_beneficiary_harmonized title: Beneficiary Search Fields description: >- Beneficiary fields to search in. Valid fields are: `retirement_beneficiary_harmonized`, `retirement_beneficiary`, `retirement_beneficiary_account`, `retirement_beneficiary_note`, `retirement_beneficiary_reason` responses: '200': description: Time-binned credit totals for a single project content: application/json: schema: $ref: '#/components/schemas/PaginatedProjectCreditTotals' '422': description: Validation Error content: application/json: schema: $ref: '#/components/schemas/HTTPValidationError' security: - APIKeyHeader: [] components: schemas: PaginatedProjectCreditTotals: properties: pagination: $ref: '#/components/schemas/Pagination' data: anyOf: - items: $ref: '#/components/schemas/ProjectCreditTotals' type: array - items: additionalProperties: true type: object type: array title: Data type: object required: - pagination - data title: PaginatedProjectCreditTotals HTTPValidationError: properties: detail: items: $ref: '#/components/schemas/ValidationError' type: array title: Detail type: object title: HTTPValidationError Pagination: properties: total_entries: type: integer title: Total Entries current_page: type: integer title: Current Page total_pages: type: integer title: Total Pages next_page: anyOf: - type: string - type: 'null' title: Next Page type: object required: - total_entries - current_page - total_pages title: Pagination ProjectCreditTotals: properties: start: anyOf: - type: string format: date - type: 'null' title: Start description: Start date of bin end: anyOf: - type: string format: date - type: 'null' title: End description: End date of bin value: anyOf: - type: integer - type: 'null' title: Value type: object required: - start - end - value title: ProjectCreditTotals ValidationError: properties: loc: items: anyOf: - type: string - type: integer type: array title: Location msg: type: string title: Message type: type: string title: Error Type type: object required: - loc - msg - type title: ValidationError securitySchemes: APIKeyHeader: type: apiKey in: header name: X-API-KEY ````