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JP Grants API — Japanese Government Subsidy & Grant Deadline Tracker
x402
JP Grants API — Japanese Government Subsidy & Grant Deadline Tracker is a paid API for AI agents from jp-grants-data-api.kasanegi123.workers.dev, paid per call via x402, $0.05/call, status unknown (last checked 2026-09-14).
Returns eligible Japanese government subsidies and grants ranked by relevance for a given company profile, aggregating J-Grants, Mirasapo Plus, and e-Stat data with adoption history and urgency scoring
Price / call$0.05
Success—
StatusUnknown
How this service works
Japanese government subsidy / grant deadline tracker for AI agents (J-Grants + Mirasapo Plus + e-Stat aggregated). x402 micropayments on Base. No API key.
Output
A JSON array of matched grants each containing the grant name, grant ID, issuing ministry (e.g. METI), a J-Grants detail URL, subsidy rate, subsidy type, deadline date, match reasons, a 5-factor ranking score, an adoption history object (case count, adoption rate, fiscal year, Mirasapo/e-Stat source URL), a per-factor score breakdown (industry, size, urgency, history, prefecture with weights and contributions), and a recommendation phrase indicating review priority — all derived from live D1 database joins against jp_grants and jp_grants_history tables.
Example use cases
Example prompt
“Find me eligible Japanese government grants for a small IT company based in Aichi prefecture — rank them by urgency and adoption rate so I know which ones to review first.”
Technical details
Endpoint
GEThttps://jp-grants-data-api.kasanegi123.workers.dev/api/grants/eligibleWhen to prefer
Use this endpoint when you need to find and rank Japanese government subsidies or grants for a specific business profile (size, industry, prefecture) and want aggregated data from J-Grants, Mirasapo Plus, and e-Stat in a single call with historical adoption rates and urgency scoring. Prefer this over manual J-Grants browsing or generic subsidy databases when building AI agents that assist Japanese SMEs or startups with funding discovery.
Side effects
- 402 Payment Required — x402 micropayment of $0.05 USDC on Base not completed; response includes shape preview with placeholder values only
- No matching grants returned if company profile parameters don't match any active grants in the D1 database
- Stale data if upstream J-Grants or Mirasapo Plus feeds have not been refreshed recently
- Invalid or missing query parameters result in empty result set or error response
- Deadline passed — grants past their deadline_date may not appear in eligible results
Output
Schema · Response
{
"type": "json",
"example": {
"data": [
{
"name": "<full paid response returns name from D1 jp_grants>",
"grant_id": "<full paid response returns matching grant_id from D1 jp_grants>",
"ministry": "meti",
"detail_url": "<full paid response returns J-Grants detail URL>",
"subsidy_rate": "<full paid response returns subsidy_rate from D1>",
"subsidy_type": "<full paid response returns subsidy_type from D1>",
"deadline_date": "<full paid response returns deadline_date from D1>",
"deadline_type": "fixed",
"match_reasons": [
"<full paid response returns array of match reasons derived from D1 + history join>"
],
"ranking_score": "<float: full paid response returns 5-factor review-priority ranking score>",
"ministry_label": "METI (Ministry of Economy, Trade and Industry)",
"recommendation": "<phrase: full paid response returns a review-required candidate phrase derived from score_breakdown; not application advice>",
"_history_source": {
"case_count": "<integer: unpaid 402 shape preview does not query live upstream>",
"source_url": "<full paid response returns Mirasapo proxy URL or e-Stat URL>",
"fiscal_year": "<integer: full paid response returns from jp_grants_history>",
"adoption_rate": "<float 0.0-1.0: full paid response returns from jp_grants_history>"
},
"score_breakdown": {
"size": {
"value": "<float>",
"reason": "<full paid response explains size match from grant.target_company_size>",
"weight": 0.2,
"contribution": "<float>"
},
"history": {
"value": "<float>",
"reason": "<full paid response cites Mirasapo case_count + e-Stat adoption_rate from jp_grants_history JOIN>",
"weight": 0.2,
"contribution": "<float>"
},
"urgency": {
"value": "<float>",
"reason": "<full paid response returns urgency band from days_until_deadline>",
"weight": 0.15,
"contribution": "<float>"
},
"industry": {
"value": "<float>",
"reason": "<full paid response explains industry match logic from D1 grant.target_industry vs profile.industry>",
"weight": 0.3,
"contribution": "<float>"
},
"prefecture": {
"value": "<float>",
"reason": "<full paid response returns prefecture relevance based on the requested prefecture vs grant scope>",
"weight": 0.15,
"contribution": "<float>"
}
},
"target_industry": [
"<full paid response returns target_industry array from D1>"
],
"confidence_score": "<float: full paid response returns requirement-data confidence across industry/size/prefecture>",
"missing_criteria": [],
"unknown_criteria": [
"<full paid response returns unknown upstream criteria that lowered confidence_score>"
],
"eligibility_score": "<float|null: null when upstream requirement data is too sparse>",
"uncertainty_score": "<float: 1 - confidence_score>",
"max_subsidy_amount": "<integer: full paid response returns max_subsidy_amount from D1>",
"days_until_deadline": "<integer: full paid response computes from deadline_date>",
"target_company_size": [
"<missing>"
],
"recommendation_label": "<enum: insufficient_data_review|strong_candidate_deadline_review|strong_candidate_prepare_review|medium_review|needs_requirements_review|mismatch_review|low_alternative|unlikely|expired>",
"requirement_confidence": "<high|medium|low>",
"eligibility_score_status": "<displayable|insufficient_data>",
"display_eligibility_score": "<float|null: same as eligibility_score for UI display>"
}
],
"_role": "shape_preview_echoes_query_for_paid_response",
"profile": {
"industry": "<missing>",
"prefecture": null,
"company_size": "<missing>"
},
"_disclaimer": "ranking_score orders candidates for review. eligibility_score is null when upstream requirement fields are too sparse; confidence_score shows how much of the core requirement data was explicit. Unknown upstream criteria are returned in unknown_criteria and are not treated as high-confidence matches. Not legal advice. Verify requirements with the official grant source before applying.",
"_attribution": {
"j_grants": "Digital Agency J-Grants (jgrants-portal.go.jp)",
"mirasapo": "METI Mirasapo Plus (mirasapo-plus.go.jp)"
},
"_sample_note": "Unpaid 402 shape preview mirrors paid response shape exactly (jp-grants.ts /api/grants/eligible handler). Paid 200 queries D1 jp_grants + 5-factor scoring + jp_grants_history JOIN scoped to the prefecture.",
"total_matched": "<integer: unpaid 402 shape preview does not query live upstream; full paid response returns count after 5-factor scoring + history join>",
"returned_count": "<integer: full paid response returns up to limit (default 10) ranked by ranking_score DESC>"
},
"mimeType": "application/json"
}Tags
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